JPH0627635Y2 - Surface treatment equipment for low activity polymer moldings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a processing apparatus for surface-modifying a low activity polymer material molded body.

(Prior Art) For example, polypropylene as a low-activity polymer material is a resin that is hard and tough, and has moisture resistance, oil resistance, and solvent resistance, and because it is easy to mold, it is used in consumer and industrial fields. Widely used in. On the other hand, a polypropylene molded body (hereinafter sometimes referred to as a molded body)
In order to improve the added value of, painting, printing,
Further, when the bonding is attempted, it is difficult to bond them because the surface is inactive.
Therefore, a treatment method for modifying the surface of the molded body so as to obtain high adhesion has been conventionally proposed.

As such a treatment method, sandblast treatment, solvent treatment, chromic acid mixture treatment, fire treatment, corona discharge treatment, plasma treatment, surface functional group imparting method, surface grafting method and the like are known. These methods are conventionally known methods, but will be briefly described below.

The sandblast treatment is a process in which a granular abrasive is collided with the surface of a compact at a high speed to roughen the surface.
However, there are drawbacks such that the working environment and the molded body are contaminated by the abrasive, the surface of the molded body becomes opaque, and further, the abrasive that has digged into the surface of the molded body cannot be removed.

The solvent treatment is to leave the molded product in vapor of halogenated hydrocarbon heated to a temperature of about 80 ° C. for a short time and swell and etch the amorphous portion on the surface of the molded product. However, when coating the surface of the molded product after the treatment, it is necessary to apply an undercoat paint containing chlorinated polypropylene to the surface, further, the treatment effect is lost in a short time, heating of halogenated hydrocarbons. Since steam is used, it is dangerous to the human body, and there is a problem that the device is likely to be corroded.

The chromic acid mixture treatment is a treatment of immersing the molded body in the chromic acid mixture heated to a temperature of about 100 ° C. for about 5 minutes to treat the surface. However, there has been a problem that a heavy load is required to make the waste liquid used for the treatment pollution-free.

Fire treatment is a treatment of the surface of a molded body with an oxidizing flame of a gas containing excess air. However, there is a drawback that the molded body may be deformed or melted by heat.

The corona discharge treatment is to apply a voltage between the electrode and the roll and to treat the surface by the generated corona discharge, but there is a drawback that it is impossible to treat other than the film-shaped molded body. .

The plasma treatment is performed by causing low temperature plasma to act on the surface of the molded body, but has a drawback that the equipment cost is high.

As a method of imparting a surface functional group, there is a method of irradiating ultraviolet rays in chlorine gas and then treating with an alkali, but it is not preferable because an extremely dangerous gas is used.

As the surface grafting method, there is a method in which benzophenone is kneaded into a polypropylene film and acrylamide is photografted in an atmosphere in which oxygen is blocked. However, since the treatment process is complicated, it is not preferable in consideration of economy.

As described above, none of the conventional surface treatment methods is satisfactory, and therefore, the present situation is that a surface treatment method having reliability, safety, and economical efficiency is desired. It was

Therefore, as a result of extensive research to find a suitable treatment method for surface modification of polypropylene moldings, polypropylene resin moldings were contacted with warmed benzene or a solvent containing benzene as a main component for an appropriate time. After this, it was discovered that when the surface of this surface was irradiated with ultraviolet rays having an irradiation wavelength of 300 nm or less, coating, printing, etc., the adhesion was dramatically improved. It was proposed by the applicant in Japanese Patent Application No. 60-219811.

(Problems to be Solved by the Invention) However, there is a problem that a suitable apparatus for industrially implementing the method proposed in Japanese Patent Application No. 60-219811 does not exist at present.

This invention has been made in view of the above-mentioned problems,
Therefore, an object of the present invention is to provide a surface treatment apparatus capable of reliably, safely and economically modifying the surface of a low activity polymer material molded body.

(Means for Solving the Problems) In order to achieve this object, the surface treatment apparatus for a low activity polymer material molded article of the first invention according to the present application preheats the low activity polymer material molded article. In the preheating chamber, a solvent treatment chamber in which the surface of the preheated molded article is brought into contact with an ultraviolet absorbing solvent, and the main irradiation wavelength of the surface is 184.9.
It is characterized by comprising an irradiation chamber for irradiating ultraviolet rays having a wavelength of nm and a transfer mechanism for transferring the above-mentioned molded body to each chamber in the order of the above-mentioned preheating chamber, solvent treatment chamber and ultraviolet irradiation chamber.

Further, the surface treatment device for a low activity polymer material molded article of the second invention according to this application is an ultraviolet absorbing solvent (benzene and benzene as a main component) heated to a predetermined temperature on the surface of the low activity polymer material molded article. The solvent is exposed to a solvent treatment chamber to which the main irradiation wavelength is set to 18
It is characterized by comprising an irradiation chamber for irradiating ultraviolet rays of 4.9 nm and a transfer mechanism for transferring the above-mentioned molded body to each chamber in the order of the solvent treatment chamber and the ultraviolet irradiation chamber.

The low activity polymer material referred to in the present invention means a resin mainly composed of the low activity polymer material, for example, as follows.

Polypropylene, polyethylene, ethylene propylene rubber.

Polypropylene with additives and / or fillers added,
Polyethylene with additives and / or fillers, ethylene propylene rubber with additives and / or fillers.

A copolymer of two or more polymers selected from polypropylene, polyethylene, ethylene propylene rubber and polymers similar thereto.

A blend of combinations of the above polymers.

A blended product obtained by combining the above copolymers.

A blend comprising a combination of each of the above-mentioned polymers and each of the above-mentioned copolymers.

A product obtained by adding an additive and / or a filler to each of the above copolymers.

Additives and / or fillers are added to the above blends.

Polymethylpentene.

Polyacetals, copolymers of polyacetals with other monomers and / or polymers, blends of polyacetals with other monomers and / or polymers, blends of polyacetals with said copolymers.

Polyacetal with additives and / or fillers added,
A product obtained by adding an additive and / or a filler to the above copolymer,
Additives and / or fillers added to the above blend.

Other surfaces have low activity such as paints, adhesives, printing inks,
It is difficult to attach functional materials.

Further, the molded body referred to in the present invention may be a molded body of various shapes such as a film, a plate-shaped body, a complicated three-dimensional shape, and a fibrous shape. Further, the molding method is not limited.

The ultraviolet absorbing solvent referred to in this invention is, for example, the following.

Aromatic hydrocarbons such as benzene, toluene, xylene (o, m, p) and tetralin.

Halogenated aromatic hydrocarbons such as chlorobenzene, dichlorobenzene (o, m, p) and trichlorobenzene.

Halogenated aliphatic hydrocarbons such as chloroform, carbon tetrachloride, dichloroethane, 1,1,1-trichloroethane, 1,1,2-trichloroethane, tetrachloroethane, trichloroethylene and tetrachloroethylene.

(Operation) According to the surface treatment apparatus of the first invention, when the low-activity polymer material compact is transported by the transport mechanism in the order of the preheating chamber, the solvent treatment chamber, and the ultraviolet irradiation chamber, On the other hand, predetermined processing for surface modification is automatically performed.

Further, in the case of the surface treatment apparatus according to the first invention, the molded body is warmed in the preheating chamber, and the molded body itself comes into contact with, for example, benzene as the ultraviolet absorbing solvent in a warm state. Therefore, even if benzene is not particularly heated, the same action as when using heated benzene is obtained.
Furthermore, the same effect as when using heated benzene can be obtained by contacting the molded body with benzene in a shorter time than the contact time between the molded body and the solvent when using heated benzene. Will be available.

Further, according to the surface treatment apparatus of the second invention, the contacting of the active ultraviolet absorbing solvent heated to a predetermined temperature with the molded body and the ultraviolet irradiation are automatically performed in this order.

(Example) Hereinafter, with reference to the drawings, an example of a surface treatment apparatus for a low activity polymer material molded article of the present invention (hereinafter may be abbreviated as a processing apparatus) will be described. It should be noted that the drawings used in the following description are only schematically shown to the extent that the present invention can be understood, and therefore, the dimensions, shapes, and arrangement relationships of the respective constituent components shown in these drawings are limited to the illustrated examples. It should be understood that this is not the case.

** Example of the first invention ** Structure of surface treatment apparatus The treatment apparatus of the first invention performs preheating on a low activity polymer material molded body (hereinafter also referred to as a molded body). After heating and heating the molded body itself, the molded body is brought into contact with an ultraviolet absorbing solvent, and subsequently, the surface of the molded body is irradiated with ultraviolet rays to modify the surface of the molded body.
For this purpose, this treatment device is equipped with a preheating chamber, a solvent treatment chamber,
It is equipped with an ultraviolet irradiation chamber and a transfer mechanism for automatically transferring the molded product so as to pass through each chamber.

1 (A) and 1 (B) are a plan view and a side view schematically showing the configuration of a processing apparatus according to an embodiment of the first invention. The processing device in this case is an example having a structure in which the respective constituent components are linearly arranged.

In FIG. 1, reference numeral 11 denotes a preheating chamber capable of heating the low activity polymer material molded body. In the case of this embodiment, the preheating chamber 11 includes a tunnel furnace-like casing 15 having a charging port 13 for charging a molded product into a processing apparatus, and a heater unit 17 provided inside the casing 15. And have. In the case of this embodiment, the heater section 17 is constituted by, for example, a far infrared panel heater using a far infrared light source. However, the heater section 17 may be any other suitable one, for example, an infrared light source (halogen lamp or the like) other than far infrared rays, a microwave heater,
It can also be configured with a high-frequency heater, a warm air device, an electric heater, or the like. Further, the shape and rated output of the heater portion 17 are determined in consideration of the shape and size of the molded body to be processed, the processing time and the like.

Reference numeral 21 denotes a solvent treatment chamber for bringing the ultraviolet absorbing solvent into contact with the preheated molded body.

The solvent processing chamber 21 in the case of this embodiment has a housing 23 and a solvent tank 25 provided in the housing 23. The solvent tank 25 is made of a suitable material having resistance to the ultraviolet absorbing solvent as described above. The solvent tank 25 may be provided with a temperature control means (not shown) and a circulation device (not shown) in order to keep the temperature of the ultraviolet absorbing solvent in the tank constant. In such a case, it is preferable to maintain the temperature of the solvent at a predetermined temperature within the range of 25 to 40 ° C. Further, an ultrasonic wave generator may be provided in the solvent tank 25 to enhance the contact effect between the ultraviolet absorbing solvent and the molded body.

In addition, the solvent tank 25 may contain the above-mentioned solvents individually, or may contain two or more kinds of solvents as a mixture, if necessary.

Solvent tank containing UV absorbing solvent as described above
By immersing the heated molded body in 25,
The molded product can be brought into contact with a solvent (details will be described later).

Further, 31 indicates an ultraviolet irradiation chamber. UV irradiation chamber in this case
Reference numeral 31 denotes a tunnel furnace-like casing 33, a synthetic quartz low-pressure mercury lamp 35 which is provided inside the casing 33 and emits ultraviolet rays having a main irradiation wavelength of 184.9 nm, and an end of the casing 33 on the conveying direction side. And a molded body take-out port 37 provided in the section. still,
In the case of this embodiment, the linear low-pressure mercury lamps 35 are arranged side by side and a plurality of linear low-pressure mercury lamps 35 are provided at appropriate intervals along the conveying direction of the molded body. However, the mounting position of the mercury lamp,
Regarding the number of lamps to be attached and the shape of the mercury lamp, consider the size of the molded body, the shape of the molded body, the output capacity of the lamp, etc., and select appropriate positions, numbers and shapes. For example, when the shape of the molded body is spherical, the shape of the mercury lamp can be arched.

The reason why the low-pressure mercury lamp 35 provided in this processing apparatus is made of synthetic quartz so that the main irradiation wavelength of the ultraviolet rays is 184.9 nm can be obtained is that the molded body is brought into contact with the ultraviolet absorbing solvent. This is because it was later found that the surface of the molded body was effectively modified by irradiating ultraviolet rays having such a wavelength (details will be described later).

In addition, reference numeral 41 represents a conveyance mechanism for the molded body. This transport mechanism is configured so that its transport speed is variable, and in this case, it is configured by a belt conveyor 41 provided so as to extend through the insides of the preheating chamber 11, the solvent treatment chamber 21, and the ultraviolet irradiation chamber 31. There is. The molded body charged into the charging port 13 is automatically transported to the preheating chamber 11 → solvent processing chamber 21 → ultraviolet irradiation chamber 31 → removal port 37 as the belt conveyor moves.

It should be noted that it is preferable that the transport mechanism also be modified in various ways according to the shape of the molded body. For example, when the molded body has a complicated shape, a conveyance mechanism having a mechanism for rotating the molded body on the belt conveyor at a proper time may be used. In this way, preheating and ultraviolet irradiation can be uniformly performed on the molded body.

Further, the processing apparatus of this embodiment is equipped with each apparatus as described below in order to surely perform the surface modification and in consideration of the safety of the operator.

An air curtain 51 is provided between the molded body charging port 13 and the heater unit 17. Furthermore, this air curtain 51 and the heater section
An exhaust duct 53 is provided between the exhaust duct 53 and the unit 17. Air curtain
51 prevents dust and the like from entering the processing device. When the solvent vapor or ozone reaches the area of the preheating chamber 11, the exhaust duct 51 compulsorily exhausts the solvent vapor or the like to a place that does not affect the worker. The air curtain
The 51 and the exhaust duct 53 are such that the blowout amount and the exhaust amount thereof can be adjusted to appropriate amounts, respectively.

An exhaust duct 54 is provided between the preheating chamber 11 and the solvent treatment chamber 21, and before the solvent that evaporates from the solvent tank 25 of the solvent treatment chamber 21 and goes to the preheating chamber 11 reaches the preheating chamber. It can be forcedly exhausted to the outside of the processing equipment. The exhaust duct 54 can adjust the exhaust amount of the heated molded body to an appropriate value so as not to cool the heated molded body.

A warm air supply unit 55 is provided in the housing between the solvent processing chamber 21 and the ultraviolet irradiation chamber 31. The warm air supply means 55 is capable of adjusting the amount of hot air blown out so that the solvent brought into contact with the molded body can be appropriately evaporated. Further, an exhaust duct 57 is provided between the warm air supply means 55 and the ultraviolet irradiation chamber 31. An air curtain 59 is provided in the ultraviolet irradiation chamber 31 in the vicinity of the outlet 37. In addition, the air curtain 59 of the housing 33
Further, an exhaust duct 61 is provided on the UV irradiation chamber 31 side, and an exhaust duct 63 is provided on the outlet side of the housing 33 with respect to the air curtain 59. Therefore, ozone or the like generated in the housing 33 of the ultraviolet irradiation chamber 31 does not enter the air curtain.
The air from 59 and the warm air from the warm air supply means 55 are trapped inside the housing 33. Further, the exhaust ducts 57 and 61 can forcibly exhaust ozone and the like in the housing 33 to the outside or the like that does not affect the worker. Therefore, the worker can be protected from ozone.

In addition, in each exhaust duct 53, 54, 57, 61, 63 provided in the processing device,
It is preferable to provide a mechanism capable of adsorbing or collecting the ultraviolet absorbing solvent so that the solvent can be reused.

Also, although not shown, this processing device includes a control unit. This control unit controls the temperature in the preheating chamber 11 and the solvent treatment chamber 21.
Management of the amount of solvent in the solvent tank 25 inside, control of the circulation device provided in the solvent tank 25, temperature control of the solvent in the solvent tank, output control of the ultrasonic generator, low pressure mercury lamp lighting off and life management, It is for controlling the conveying speed of the belt conveyor 41 for conveying the molded body, and further for controlling the flow rate of the air curtain and the exhaust duct, etc., but for these controls, conventionally known detection methods and control methods may be used. , The description is omitted.

Description of Operation of Processing Apparatus Next, the operation of the processing apparatus of the above-described embodiment will be briefly described in order to deepen the understanding of the first device.

A belt conveyor 41 with a low activity polymer material molded body at the inlet 13
Place on. With the movement of the belt conveyor 41, this molded body is conveyed inside the housing 15 of the preheating chamber. When this molded body moves inside this housing 15, it is a belt conveyor.
41 transport speed, far infrared panel heater output, housing
It is heated according to the amount of heat that is mainly determined by the length of 15. Further, this molded body is conveyed into the solvent tank 25 along with the movement of the belt conveyor 41 and brought into contact with the ultraviolet absorbing solvent in the solvent tank 25, and then the casing 33 of the ultraviolet irradiation chamber 31.
Be transported inside. Further, when this molded body moves inside the housing 33, the low-pressure mercury lamp 35 provided in the housing 33
It is irradiated with ultraviolet rays from and reaches the outlet 37.

In this way, the surface of the molded body can be automatically modified.

Preliminary Experiment Data Next, the effectiveness of the preheating chamber and the effectiveness of the ultraviolet irradiation chamber of the treatment apparatus of the first invention will be described with reference to the results of an example of the preliminary experiment.

<Effectiveness of Preheating> A polypropylene resin molded body as a low activity polymer material was preheated by far infrared rays so that the temperature of the molded body would be about 80 ° C. Subsequently, this molded body is heated to 30 ° C.
It was immersed in benzene at the temperature of 20 seconds for 20 seconds. Then, from a distance of 5 cm from this molded body,
The light of a low-pressure mercury lamp using synthetic quartz glass as the lamp glass was irradiated for 3 minutes. An acrylic resin paint was spray-coated on the ultraviolet-irradiated molded body, and this coating film was dried in air at room temperature for about 48 hours to prepare a molded body of Comparative Example 1.

A molded product similar to the starting molded product used in the preparation of Comparative Example 1 was used.
It was immersed in benzene heated to a temperature of 5 ° C. for 1 minute.
The synthetic quartz low-pressure mercury lamp used for producing the molded body of Comparative Example 1 was irradiated to the molded body under the same conditions as those at that time, and thereafter, a coating film was formed and a coating film was dried in the same manner as in Comparative Example 1. A molded body of Comparative Example 2 was produced.

The coating films of the molded products of Comparative Example 1 and Comparative Example 2 are cross-cut into a grid pattern with a side of 2 mm using a cross-cut guide. Then, after applying cellophane tape to this coating film, a peeling test was conducted. Table 1 shows the average value of the residual rate (%) of the eyes after the peeling test of both cross-cut coating films. As is clear from this result, the adhesiveness of the coating film formed on the molded product of Comparative Example 1, that is, the molded product which was preheated, was superior to that of Comparative Example 2.

Therefore, even if the contact time with the ultraviolet absorbing solvent is shortened without heating the solvent, it is possible to easily obtain a coating film having excellent practicality by preheating the molded body. It can be said that it can be done.

<Effectiveness of irradiation wavelength> 3 polypropylene resin moldings without preheating
After being immersed in benzene kept at a temperature of 0 ° C. for 5 minutes and then taken out, these molded bodies were divided into two groups.

The molded bodies of one group were irradiated with light from a low-pressure mercury lamp using natural quartz glass as a lamp glass for 5 minutes at a distance of 5 cm from the molded bodies in the air. Acrylic resin paint was spray-painted on the ultraviolet-irradiated molded body, and this coating film was dried in air at room temperature for about 48 hours, and then Comparative Example 3
A molded body of was produced.

In addition, the light of a low-pressure mercury lamp using synthetic quartz glass as a lamp glass was irradiated for 5 minutes on the other group of molded bodies in the air. A coating film was formed on this molded body in the same manner as Comparative Example 3, and the coating film was dried in the same manner as Comparative Example 3 to produce a molded body of Comparative Example 4.

The coating films of the molded articles of Comparative Example 3 and Comparative Example 4 are cross-cut into a grid pattern using a cross-cut guide so that one side is 2 mm. Then, after applying cellophane tape to this coating film, a peeling test was conducted. Table 2 shows the average value of the residual rate (%) of the eyes after the peeling test of both cross-cut coating films. As is clear from this result, the adherence of the coating film was better when the molded product of Comparative Example 4, that is, the mercury lamp made of synthetic quartz was used.

Compared with a low-pressure mercury lamp made of natural quartz, a low-pressure mercury lamp made of synthetic quartz is more likely to transmit a light ray having a wavelength of 184.9 nm, and the energy of light of this wavelength is also large. It seems to be easy to cut. For this reason, it is considered that the effect of modifying the surface of the molded body is greater when the low-pressure mercury lamp made of synthetic quartz is used.

The first invention is not limited to the above embodiment.

In the embodiment described above, the molded body is contacted with the solvent such as benzene by immersing the molded body in the solvent tank, but this contact method is not limited to this. For example, a nozzle for ejecting benzene may be provided on the upper part of the belt conveyor 41, and the molded body conveyed along with the movement of the benzene conveyor may be contacted by blowing benzene from above the head. Alternatively, a solvent may be applied.

** Second Invention Embodiment ** Next, a second embodiment embodiment of the present application will be described.
The surface treatment apparatus of the second invention is an apparatus having a constitution in which the preheating chamber included in the apparatus of the first invention is removed, and ultraviolet rays heated to a predetermined temperature on the surface of the low activity polymer material molded body are used. Absorbent solvent (excluding benzene and a solvent containing benzene as a main component. Hereinafter, the same applies to the second embodiment)
And a solvent treatment chamber for contacting the solvent, an irradiation chamber for irradiating the solvent-contacted surface with ultraviolet rays having a main irradiation wavelength of 184.9 nm, and the molded body are conveyed to each chamber in the order of the solvent treatment chamber and the ultraviolet ray irradiation chamber. It is equipped with a transport mechanism. Less than,
The embodiment of the second invention will be described with reference to two types of apparatus examples.

<First Embodiment of Second Invention> The apparatus of the first embodiment is suitable for contacting a molded body with an ultraviolet absorbing solvent by a dipping method. FIGS. 2A and 2B are a plan view and a side view schematically showing such a surface treatment apparatus. Further, FIG. 2 (C) is a cross-sectional view showing a part of the device taken along the line II in FIG. 2 (A).

In FIG. 2, reference numeral 100 denotes a solvent treatment chamber in which a surface of a molded article of a low activity polymer material (hereinafter, also referred to as a molded article) is brought into contact with an ultraviolet absorbing solvent heated to a predetermined temperature.

The solvent processing chamber 100 in the case of this embodiment comprises a solvent tank indicated by 101 for immersing the molded body in the ultraviolet absorbing solvent. The solvent tank 101 is made of a suitable material having resistance to the ultraviolet absorbing solvent as described above, and has a solvent supply port and a solvent discharge port (not shown). or,
A heater 103 for heating the ultraviolet absorbing solvent in the tank and a thermocouple 105 for measuring the temperature of the solvent are provided in the solvent tank 101. The heater 103 and the thermocouple 105 are connected to a control unit described later, which keeps the solvent at a predetermined temperature. A solvent stirring means may be provided in the solvent tank 101 to make the temperature of the solvent uniform, or an ultrasonic generator may be provided to enhance the contact effect between the solvent and the molded body.

Further, the solvent processing chamber 100 has a lid-like upper portion (hereinafter, the lid portion is referred to as a ceiling portion 100a), the solvent evaporated from the solvent tank 101 is cooled and liquefied into the ceiling portion 100a. A solvent cooling means indicated by 107 for returning to the tank 101 is attached. The cooling means 107 in this case has a configuration including a pipe 107a for flowing cooling water and the like, and a radiator 107b connected to this pipe, and outputs the cooling water supplied from the inlet 107c to the pipe 107a from the output port 107d. The cooling water is circulated to cool the radiator 107b. This cooling water may be supplied from a cooling means provided in the treatment apparatus itself, may be supplied from a cooling means separately provided, or may be new water constantly supplied from a water absorption pipe in the factory. It may be present and can be supplied by any suitable method.

Further, an exhaust duct indicated by 109 is provided in a region of the ceiling portion 100a of the solvent processing chamber 100 that substantially opposes the cooling means 107. The exhaust duct 109 is for exhausting the solvent vapor that has been liquefied by the cooling means 107 and has risen. Through this exhaust duct 109, the solvent vapor can be exhausted to a place where it is not harmful to the worker, or sent to a device for reusing the solvent.

Further, the solvent treatment chamber 100 includes air curtains indicated by 111a and 110b. These air curtains are solvent tanks 101
It is provided so as to guide the solvent vapor evaporated from the side to the side where the cooling means 107 and the exhaust duct 109 are provided, and in this case, it is provided at a position above the edge of the solvent tank 101 and blows air downward. However, the position where the air curtain is provided can be changed according to the design, such as being provided on the side wall of the solvent processing chamber 100.

The ceiling portion 100a of the solvent processing chamber 100 has a structure that can be opened upward for inspection of the inside of the solvent tank 101 and the like. What is shown by 100b is a handle used when opening and closing the ceiling portion 100a.

Further, in FIG. 2, reference numeral 120 denotes an ultraviolet irradiation chamber. The ultraviolet irradiation chamber 120 in this case has a lamp housing indicated by 121 so as to cover a belt conveyor of a transfer mechanism described later. The lamp housing 121 can be opened upward for inspection of the inside of the ultraviolet irradiation chamber 120 and the like, and 121a indicates a handle used when opening and closing the lamp housing 121. This lamp housing 121 has a main irradiation wavelength of 184.9 nm.
It has a low-pressure mercury lamp 123 made of synthetic quartz that emits ultraviolet rays. The lamp housing 121 in this embodiment is
A plurality of arched low-pressure mercury lamps 123 (see FIG. 2 (C)) are arranged side by side along the conveying direction of the molded body (direction indicated by P in the figure) at appropriate intervals. However, regarding the mounting position and number of low-pressure mercury lamps, and the shape of the low-pressure mercury lamp, consider the size of the molded body, the shape of the molded body, the output capacity of the lamp, etc., and select appropriate positions, numbers and shapes. .

Further, in the lamp housing 121 of the ultraviolet irradiation chamber 120,
Exhaust duct indicated by 125 for exhausting ozone generated in the ultraviolet irradiation chamber, or gas toxic to the human body which is considered to be emitted from the ultraviolet absorbing solvent by ultraviolet irradiation, ultraviolet rays leaking out of the ultraviolet irradiation chamber 120 Covering members 127a and 127b for prevention are respectively provided.

In addition, in FIG. 2, reference numeral 130 denotes a molded body transport mechanism.
This transfer mechanism has a variable transfer speed,
In this case, it is composed of a solvent tank 101 of the solvent processing chamber 100 and a belt conveyor 130 provided so as to extend inside the lamp housing 121 of the ultraviolet irradiation chamber 120. UV irradiation room 1
A molded body guide 133 is provided on the belt 20 along the belt conveyor 130 to guide the molded body to a position where ultraviolet rays are effectively irradiated.

In such an apparatus, the molded body 140 loaded into the loading port of the processing apparatus has the solvent tank 101 of the solvent processing chamber 100 with the movement of the belt conveyor 130 → the ultraviolet irradiation chamber 120 →
It is automatically transferred to the outlet and subjected to a predetermined surface treatment.

As with the processing device of the first invention, the transport mechanism 130 can be modified in various ways according to the shape of the molded body.

Further, in FIG. 2, reference numeral 150 indicates a control unit. This control unit 150
Is a main power switch indicated by 151a, a main power pilot lamp indicated by 151b, a solvent temperature controller indicated by 153, an integrating meter indicated by 155, an exhaust duct drive switch indicated by 157a, an exhaust duct pilot lamp indicated by 157b, and 159a. Belt conveyor drive switch shown, belt conveyor pilot lamp shown at 159b, belt conveyor speed controller shown at 159c, 15
A belt conveyor speedometer indicated by 9d, a low pressure mercury lamp drive switch indicated by 161a, a pilot lamp for a low pressure mercury lamp indicated by 161b and a low pressure mercury lamp monitor lamp indicated by 161c.

<Experimental Results of Processing Apparatus of Second Invention> Next, experimental results of surface treatment using the apparatus of the first embodiment of the second invention will be described.

-Experiment 1-Tetrachlorethylene and carbon tetrachloride are put in the solvent tank 101 at a volume ratio of 95: 5. The temperature of the solvent is about 60 ° C., the molded body is immersed in the solvent for 60 seconds, the total irradiation amount of ultraviolet rays from the low-pressure mercury lamp is 570 to 580 mJ / cm ² , and UV irradiation room
The temperature controller 153 and the belt conveyor speed controller 159 of the surface treatment device are controlled so that the ozone concentration in 120 is 2 ppm or less.
c, and the conditions of the ultraviolet irradiation chamber 120 are set respectively.

Further, as a molded article for experiment, a homopolypropylene resin having a melt index (Melt Index: MI) of 40 at a temperature of 230 ° C. under a load of 2.16 Kg, an ethylene propylene block copolymer resin having an MI of 15 (ethylene Inclusion 6.5
%), And a molded body having a size of 100 × 400 mm and a thickness of 3 mm is prepared. The molding was performed using an injection molding machine Nestal 515 manufactured by Sumitomo Heavy Industries, Ltd. with an injection temperature of 220 ° C.

The resin molded body and the resin molded body described above are respectively put into the surface treatment apparatus shown in FIG. 2 to perform a predetermined surface treatment. These surface-treated molded bodies are molded bodies a,
These are referred to as molded bodies b.

Next, the wetting tension of each of the molded body a, the molded body b, and the molded body of resin which is not subjected to the surface treatment (hereinafter referred to as molded body c) is measured by using dimethylformamide and ethylene glycol monoethyl ether. Measure with a standard solution of wettability index (mixed with JIS K6768-1977). Table 3 shows the wetting tension of each of the molded products a to c. It can be seen that the leakage tension of the surface-treated molded body is superior to that of the untreated one.

Next, the coating film adhesion of each of the molded body a, the molded body b, and the molded body c was examined by performing the treatments described below.

A two-component urethane paint (called R271 manufactured by Nippon Bee Chemical Co., Ltd.) is applied to the surface of each molded product with a film thickness of 30-35μ.
m to 30 m, then apply this coating at 90 ° C for 30
Let dry for minutes. Then, the coating film of each molded product is cross-cut using a cross-cut guide in a grid pattern so that one side is 2 mm. The cellophane tape (Mitsubishi Unicellophane Tape 18) is pressure-bonded to this coating film, and then the cellophane tape is peeled off. The adhesiveness was expressed by the residual rate (%) of the eye after peeling. Table 3 shows the adhesion (initial adhesion) of the coating film on each molded product. No coating film was left on the molded product which had not been surface treated.

Further, the molded body a and the molded body b used in the above-mentioned peeling test
Was immersed in water at a temperature of 40 ° C. for 10 days, and then a peeling test similar to that described above was performed on the coating film of each molded product to examine whether or not the adhesiveness of the coating film was reduced. As a result, peeling of the coating film did not occur at all in the molded articles a and b (secondary water-resistant adhesion in Table 3 (abbreviated as secondary adhesion in the table)).
See section).

<Second Embodiment of Second Invention> The apparatus of the second embodiment of the second invention is to bring the molded body into contact with the ultraviolet absorbing solvent by spraying the solvent. 3A and 3B are a plan view and a side view schematically showing such a surface treatment apparatus.
In addition, FIG. 3 (C) shows this device as I- in FIG. 3 (A).
It is sectional drawing which cut | disconnected along the I line | wire and showed a part thereof. The structure of the ultraviolet irradiation chamber and the transfer mechanism of the surface treatment apparatus of the second embodiment is the same as that of the apparatus of the first embodiment shown in FIG. The description is omitted. Further, also in the description of the solvent processing chamber, the same components as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 3, reference numeral 200 denotes a solvent treatment chamber in which the surface of the molded product is brought into contact with the ultraviolet absorbing solvent heated to a predetermined temperature.

The solvent processing chamber 200 of this second embodiment is composed of a belt conveyor 130.
A shower head indicated by 201 is provided at an appropriate position above the belt conveyor so that the heated ultraviolet absorbing solvent can be sprayed onto the molded body conveyed by the above from above the molded body. Further, the solvent treatment chamber 200 includes a solvent tank indicated by 203 for receiving the sprayed solvent.
The solvent tank 203 includes a shower head 20 through a pipe 205a, a circulation pump 207, and a pipe 205b.
Connected to 1. A heater 209 is wound around an appropriate portion of the pipe 205a.
The solvent sent from the solvent tank 203 to the shower head 201 is heated by 09. The heater 209 is heated by the driving power source indicated by 211, and the driving power source is controlled by the temperature controller 153.

The apparatus of the second invention is capable of automatically surface-treating a molded article of a low activity polymer material without preheating, and also considers worker's safety. It has the feature that the device price can be lower than that of the first device.

Also in the case of the apparatus of the second embodiment, it is possible to adopt a structure in which the inlet and the outlet of the molded body are substantially at the same position, for example, a circular tunnel furnace type apparatus or a vertical type.

Modification Note that the treatment device of the first invention described above has a preheating chamber, a solvent treatment chamber and an ultraviolet irradiation chamber linearly arranged, and each treatment device of the second invention has a solvent treatment chamber and an ultraviolet irradiation chamber linearly arranged. This is explained by using an example in which they are arranged in a regular manner. However, the processing device of the present invention is not limited to this example. In consideration of the installation location of the processing apparatus, workability, etc., for example, a configuration in which the inlet and the outlet are substantially at the same position, for example, a circular tunnel furnace type apparatus or a vertical type apparatus can be used. .

Needless to say, each of the devices of the first and second inventions described above can also move the molded body intermittently. Such movement is effective when the molded body has a complicated shape. In other words, when the molded body has a complicated shape and it is necessary to uniformly irradiate it with ultraviolet rays, the molded body is temporarily stopped during transportation,
This is effective when using irradiation equipment having an optical system and a lamp capable of uniformly irradiating this molded product with ultraviolet rays. A good example is the surface treatment of the moldings used for automobile bumpers.

(Effect of the Invention) As is clear from the above description, according to the surface treatment apparatus for a low activity polymer material molded body of the first invention of the present application,
The pre-heating chamber, solvent treatment chamber, ultraviolet irradiation chamber, and a transport mechanism that automatically passes the molded body to each of these chambers, so that the surface of the molded body of low-activity polymer material can be painted or printed. Alternatively, the surface can be easily modified so that adhesion or the like can be performed with good adhesion.

Further, according to the treatment apparatus of the first invention, by preheating the molded body itself, it is possible to obtain the same effect as when the ultraviolet absorbing solvent is heated without heating it. When the UV absorbing solvent is heated and used, the amount of evaporation of this solvent becomes very large, so a device for cooling this evaporative gas and collecting the solvent is required,
This is not necessary in the processing device of this invention.

Further, as is clear from the structure of this device, the safety of the operator is taken into consideration.

On the other hand, the surface treatment device of the second invention of this application automatically paints the surface of the low activity polymer material molded body without preheating,
The surface can be modified so that printing or adhesion can be performed with good adhesion, and the safety of the worker is taken into consideration. The size of the device can be reduced by removing the preheating chamber. It has a large specific heat and is suitable for surface treatment of a compact that is difficult to preheat.

Therefore, it is possible to provide a surface treatment apparatus capable of reliably, economically and safely performing surface modification of a low activity polymer material molded body.

[Brief description of drawings]

1 (A) and 1 (B) are a plan view and a side view schematically showing one structural example of the surface treatment apparatus of the first invention, and FIGS. 2 (A), (B) and (C) are , A plan view, a front view and a partial sectional view schematically showing the structure of the surface treatment apparatus of the first embodiment of the second invention, and FIGS. 3 (A), (B) and (C) FIG. 5 is a plan view, a front view, and a partial sectional view schematically showing the structure of the surface treatment apparatus of the second embodiment of the invention. 11 …… Preheating chamber, 13 …… Molded material inlet 15 …… Case 17 …… Heater part (far infrared panel heater) 21 …… Solvent processing chamber, 23 …… Case 25 …… Solvent tank, 31… … Ultraviolet irradiation chamber 33 …… Enclosure 35 …… Synthetic quartz low-pressure mercury lamp 37 …… Molded body outlet, 41 …… Transport mechanism 51,59 …… Air curtain 53,54,57,61,63 …… Exhaust Duct 55 …… Warm air supply means 100 …… Solvent processing chamber 100a …… Ceiling of solvent processing chamber 101b …… Handle, 101 …… Solvent tank 103 …… Heater, 105 …… Thermocouple 107 …… Solvent cooling Means, 107a ... Cooling water pipe 107b ... Radiator, 107c ... Cooling water inlet, 107d ... Cooling water output port, 109 ... Exhaust ducts 111a, 111b ... Air curtain 120 ... UV irradiation chamber, 121 ... … Lamp housing 121a …… Handle 123 …… Synthetic quartz low-pressure mercury lamp 125 …… Exhaust duct, 127a, 127b …… Cover Material 130 …… Transport mechanism, 133 …… Molded body guide 140 …… Molded body, 150 …… Control section 151a …… Main power switch 151a …… Main power pilot lamp 153 …… Solvent temperature controller, 155… Integrator 157a …… Exhaust duct drive switch 157b …… Exhaust duct pilot lamp 159a …… Belt conveyor drive switch 159b …… Belt conveyor pilot lamp 159c …… Belt conveyor speed controller 159d …… Belt conveyor speed meter 161a …… Low pressure mercury lamp drive switch 161b …… Pilot lamp for low pressure mercury lamp 161c …… Monitor lamp for low pressure mercury lamp 200 …… Solvent processing chamber, 201 …… Shower head 203 …… Solvent tank, 205a, 205b …… Solvent pipe 207… … Circulation pump, 209 …… Heater 211 …… Heater drive power supply.

Front page continued (72) Inventor Yoshimoto Matsumoto 1-45-11 Yoyogi, Shibuya-ku, Tokyo Inside the DUMUL J Building 2F Run Technical Service Co., Ltd. 1 Sumitomo Kagaku Kogyo Co., Ltd. Chiba Research Center Examiner Hisanao Tanaka (56) References JP-A-62-79235 (JP, A)

Claims (3)

[Scope of utility model registration request] 1. A preheating chamber for preheating a low activity polymer material compact, a solvent treatment chamber for contacting an ultraviolet absorbing solvent to the surface of the preheated compact, and a main irradiation wavelength of 184. A low activity polymer material molding, comprising: an irradiation chamber for irradiating ultraviolet rays having a wavelength of 9 nm, and a transport mechanism for transporting the molded body to the preheating chamber, the solvent treatment chamber, and the irradiation chamber in this order. Body surface treatment equipment. 2. A solvent treatment chamber in which an ultraviolet absorbing solvent (excluding benzene and a solvent containing benzene as a main component) heated to a predetermined temperature is brought into contact with the surface of the low activity polymer material molded body, and the surface thereof. A low activity polymer comprising: an irradiation chamber for irradiating ultraviolet rays having a main irradiation wavelength of 184.9 nm; and a transfer mechanism for transferring the molded body to each chamber in the order of the solvent treatment chamber and the irradiation chamber. Surface treatment equipment for material compacts. 3. The surface treatment apparatus for a low activity polymer material molded article according to claim 1, wherein the low activity polymer material is a polypropylene resin.