JPS59190830A - Reinforcement material - Google Patents

Abstract

PURPOSE:To reuse unused coating powder material recovered in a dry process as a reinforcing sheet by adding 40-150pts.wt. of thermosetting resin in the unhardened to the semihardened form to 100pts.wt. of unused coating powder material to fabricate into a sheet form. CONSTITUTION:40-150pts.wt. of thermosetting resin is measured to 100pts.wt. of unused coating powder material recovered in a dry process, premixed in a Henschel mixer etc., then, paste of high viscosity obtained is kneaded in a triple roll, a Banbury mixer, etc. to prepare homogeneous composite. This composite is pressed or rolled, etc. into a sheet with a specified thickness. Said sheet itself shows panel reinforcing effect but if one side of the sheet is lined with a reinforcing layer, rigidity improving effect thereof will be remarkable.

Description

[Detailed description of the invention] The present invention relates to a reinforcing material that contributes to quantification.

For example, in automobiles, efforts are being made to reduce their weight in order to save resources and energy. If you reduce the thickness of the material or reduce the number of structural members, the strength will decrease, and in the case of a car door, the strength of various parts will decrease, and the stiffness of the outer panel will decrease. In order to solve this problem, which often has problems such as shortages, poor operation feel, etc.,
A reinforcing material as described in Japanese Patent No. 37526 has been proposed. That is, its structure is shown in FIGS. 1 to 3. In the state before use shown in FIGS. The lower surface of the hem 21 of the reinforcing resin Jll#2, which is formed by attaching the forming material 3 and extends wider than the width of the bead forming material 3, forms the mounting surface 22. Before use, the reinforcing resin layer 2 is prepared in an uncured or semi-cured state to have Tl1J flexibility, and the mounting surface 22 is used for vertical surfaces, etc., as shown in FIG. In this case, for example, a foam sheet is used as the V-rubbing bead forming material 3, which is made to have adhesive properties or has an adhesive force and can be bonded. Any type of resin material may be used, and it foams when exposed to heat and has a qJ bending temperature before the use of the reinforcing material 1V, which is before 1113I.

The bead forming material 3 may have a thin circular cross section of a rectangular cross section cut along sea 1-(r9J).

As shown in FIG.
It comes in contact with and is pasted on. At this time, since the reinforcing resin layer 2 and the bead forming material 3 have flexibility, the ability to follow the shape of the panel A is good.
Since it is a foam sheet before foaming, it has particularly good followability.
The mounting surface 22 is firmly attached to the panel A. When the panel A and the reinforcing material 1 are heated from this state, the bead forming material 3 first foams, and in this state the reinforcing resin layer 2 hardens to form the bead 23. Panel A is strengthened and reinforced by this bead 23. Furthermore, when the bead forming material 3 is formed of a foamed sheet, the reinforcing material 1 is especially lightweight. In some cases, the reinforcing resin layer 2 without the bead forming material 3 is used as a reinforcing material. In any case, the reinforcing resin layer 2 is often made of epoxy resin, but melamine thread, phenol thread, A resin such as urea thread is used, and fillers such as talc and calcium carbonate are used. These fillers have a high specific gravity, and these fillers pose a problem in reducing the weight of reinforcing materials.

Incidentally, powder coating has come to be used for automobile bodies, electric refrigerators, and air conditioners.

The first reason for adopting powder coating is to prevent pollution by taking advantage of the fact that it is generally solvent-free.

However, there is a problem in that powder coatings themselves are currently quite expensive. Therefore, in order to be economically advantageous, unapplied paint that has not been applied to the object to be coated is generally collected in powder form using a dry method and used again, thereby reducing paint losses. ing.

In recent years, powder coatings have been increasingly used for roof coating (outermost decorative finish). A lift like this,
For example, in the case of an automobile body, since multiple paint colors are used, the recovered unpainted paint is a mixture of colors. For this reason, it is extremely difficult to reuse the recovered uncoated paint, and the reality is that it is treated as waste, which requires a large amount of money to dispose of.

The present invention has been made in view of the problems of reinforcing materials and the actual situation of powder coating, and has been developed by applying an uncured or semi-cured thermosetting resin 40 to the uncoated powder coating lOO heavy lid. The purpose is to solve the above-mentioned problem by adding ~150 parts to form a sheet.

The powder coating in the present invention refers to a powder coating with a particle size of 1 to 100 μm consisting of a resin, a curing agent, a pigment, and other additives blended as necessary. It is broadly divided into wet method and wet method. Furthermore, the dry method is divided into the tri-blend method and the melt-blend method, and the wet method is divided into the spray drying method, the precipitation method, and the phase separation method, but the powder coating in the present invention can be produced by any of the manufacturing methods. good.

Types of resin include polyvinyl chloride, polyethylene,
Polyolefins such as polypropylene, polyamides,
There are thermoplastic resins such as cellulose-based and polyester-based, and thermosetting resins such as epoxy thread, thermosetting polyester, and thermosetting acrylic.

Among these powder coatings, thermosetting polyester coatings and thermosetting acrylic coatings are representative for finishing the outermost layer, and these will be explained below as examples.

Thermosetting polyester powder coatings are widely used for exterior decoration, and the resin form is roughly divided into saturated polyester and unsaturated polyester threads.

The former saturated polyester system is a combination of saturated polybasic acid or its anhydride and polyhydric alcohol! a It is an accessory. The former saturated polybasic acids or their anhydrides include phthalic anhydride, inphthalic acid, terephthalic acid, adipic acid,
Succinic acid, etc. are dihydric alcohols, and the latter polyhydric alcohols include ethylene glycol, diethylene glycol, triethylene glycol, flopylene glycol, cyglobylene glycol, trimethylolpropane, pentaerythritol, neopentyl glycol, and hydrogenated bisphenol A. etc. Moreover, an unsaturated polyester system can be produced by replacing part or all of the saturated polybasic acid used in the saturated polyester system with an unsaturated polybasic acid!
In these powder coatings, a crosslinking agent is used if necessary. Typical examples thereof include acid anhydrides, melamine resins, polyisocyanate resins, etc. Specific examples thereof include biromellitic anhydride (% Publication No. 39-24,120), hexamethane? Dimethylolmelamine (Special Publication No. 47-27, 152)
(Japanese Patent Publication No. 49-2,179), blocked hexamethylene diison abutment (Japanese Patent Publication No. 49-2,179), and the like.

Thermosetting acrylic thread powder coatings are mainly composed of thermosetting acrylic resin and curing agent, and this thermosetting acrylic resin contains non-monofunctional monomers and functional monomers. It is obtained by polymerization, and a wide variety of monomers can be obtained by combining these monomers. Examples of non-vinyl monomers include styrene, acrylonitrile, methacrylatrile, methyl methacrylate, ethyl methacrylate, n-
Butyl methacrylate, inbutyl methacrylate, t
ert-butyl methacrylate, methyl acrylate,
Examples include ethyl acrylate. Examples of the non-functional soft base material include n-butyl acrylate, 2-ethylhexyl acrylate, 2-ethylhexyl acrylate, stearyl acrylate, lacryl acrylate, and the like. In addition, examples of monomer monomers include acrylic acid, methacrylic acid, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 3-hydroxypropyl methacrylate, 2-hydroxyethyl acrylate, glycidyl methacrylate, glycidyl acrylate, etc. .

There are a wide variety of curing agents, and the type of curing agent depends on whether the crosslinkable functional group is μJ. In resins using carbonic acids such as acrylic acid, methacrylic acid, maleic acid, and itacone-related monomers as the lactic monomer, the crosslinkable functional group is a carboxyl group. As a curing agent for this crosslinkable g-functional group, a diebochishi compound (Japanese Patent Publication No. 48-37,748'@
), polyvalent oxazoline (% JP-A-48-34,239@), polyvalent oxazine (JP-A-48-55,232), and the like.

Next, the resin used for the reinforcing resin sheet into which the uncoated powder weight is mixed will be explained. The resin has the role of binding the unapplied powder coating, and is preferably an uncured liquid resin. Examples of this liquid resin include holbutadiene, epoxy, polyester, phenol, acrylic, etc. Any resin can be used, but the adhesiveness of the sheet to the panel,
In view of the effect of improving the stiffness of the panel after curing, it is more preferable than epoxy resin.

The composition of the liquid resin is determined by the adhesion of the sheet to the panel and the shape retention of the sheet. That is, if the liquid resin becomes too large, it tends to stick to the panel, but it also tends to flow during high-temperature baking, making it impossible to maintain the shape of the sheet and failing to perform its intended function. Furthermore, if the amount of liquid resin is too small, the shape retention during high-temperature baking is good, but on the other hand, the adhesion becomes poor, causing problems such as not adhering well to the panel or falling off from the panel. From this point of view, the present invention@ conducted an experiment on the optimum composition of liquid resin, and confirmed that the violet is present in a 40 to 150 TL grave area in a heavy coating area. In addition, in order to reduce the viscosity of V4, a small amount of inorganic fillers such as Merck, calcium carbonate, clay, and titanium, or organic fillers such as cork powder and plastic powder may be applied to this sheet.

The manufacturing method of the reinforcing material of the present invention will be briefly described.

The recovered uncoated powder paint, liquid resin, and filler if necessary are premixed using a Henschel mixer, etc., and then the resulting high viscosity paste is mixed with three rolls. , knead with a bumperley mixer or the like to form a homogeneous composition. This composition is formed into a sheet of a predetermined thickness by pressing or rolling.

The above-mentioned sheet has a large panel reinforcing effect by itself, or if a reinforcing layer is placed on one side of the central VC sort (the opposite side to which the panel V is attached), the stiffness improvement effect will be even greater. ,preferable.

The reinforcing layer may be made of inorganic yarn or organic cloth, but gasis cloth is currently preferred from the viewpoint of heat resistance, price, etc.

Furthermore, a bead forming material used in the prior art may be attached. It should be noted that the thinner the sheet is, the better it is from the it and i curves, but the stiffness improvement effect is markedly reduced in the case of faun, so the thickness must be 1au or more.

The present invention will be explained below with reference to its implementation.

(Example 1) Liquid resin blended at 60.80, 100, 120, 140, and 150 weights was kneaded in a three-roll mill, then sandwiched between release paper and pressed to form a 2 mm thick reinforced resin sheet. Seven types were created.

The properties of this sheet are shown in 6 Room Temperature (231).

Comparative Example 1 In the same manner as in Example 1, dicyandiamide was added to 20.30.160.170.180°190 parts of the epoxy resin as shown in Table 1 to 100 parts by weight of the uncoated powder coating. Six types of sheets were prepared by adding the additives, and the adhesion and shape retention properties were evaluated and shown in Table 1.
'l') (Note) *l Red, white and yellow 3-spear acrylic thread mixed powder paint with a semi-uniform particle size of 50μ CEi Hon Paint (Made) Baudax A1 Red: White: Yellow = 3:2:1 (fi lid mix ratio)].

*2 Epicoat 828 manufactured by Shell Chemical. *3 Nippon Carbide (closed) g! '4'2000. *4 0.8m
mt degreased steel plate, *5Cured in a hot air circulation oven at 170°C for 30 minutes with the steel plate held vertically.

Example 2 Epoxy resin (Shell Chemical Co., Ltd. Ebicolle 5ZS) was added to the unpainted powder paint 100 Heavy Inspector with the same composition as Example 1.
Part ii and 8-layer lid part of dicyandiamide (Nippon Carbide Co., Ltd. = 11-2000) as a curing agent for epoxy resin were blended, kneaded in a three-roll mill, then sandwiched between release paper and mixed in a press for 1, 2, Sheet A had a thickness of 3.4 mm.

7-Cut out a part of the sheet A and put glass cloth [Unitika x-x] and glass ECM200 (0,23a) on one side.
1, 2, 3, 4 ni
A sheet B having a thickness of m was used.

The sort produced in this way was placed on a degreased steel plate (50 mm x 20
0 (101% thickness: 0.8 mnt), placed in a hot air circulation oven, and cured at 170° C. for 30 minutes.

This test piece was placed on a pair of rod-shaped fulcrums with a span distance of 1 Oo-, with the steel plate facing up, and the entire center of the fulcrum was
The songs were tested by pressing at a speed of mm 2 /min and the results shown in Figure 4 were obtained. As the thickness of the sheet increases, the rigidity of the system increases, and the reinforcing effect of the sheet is observed. In addition, the glass cloth that is completely perforated has an even greater effect of improving rigidity.

As described above, according to the present invention, the composition is such that 40 to 150 parts by weight of an uncured or semi-cured thermosetting resin is added to 10 parts by weight of unapplied powder paint to form a sheet. Since the reinforcing material has all these characteristics, it uses a filler with a lower specific gravity compared to the filler used in conventional reinforcing materials, so it can be made lighter without changing its strength, and it is also cheaper. (2) The cost of disposing of vermilion M costume paint can also be eliminated.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional reinforcing material, Figure 2 is a diagram showing a conventional reinforcing material attached to a panel, which is a member to be reinforced, and Figure 3 is a diagram showing the state of the reinforcing material after it has completely cured. The figure shown in FIG. 4 is a graph showing the relationship between the thickness and strength of the reinforcing material of the present invention. 1...Reinforcement material 2...Reinforcement resin layer 3...Bead forming material A...Panel patent Applicant: Nissan Motor Co., Ltd. Agent Patent attorney: Akihiro Ohnishi (15)

Claims (1)

[Claims] A reinforcing material characterized in that it is made into a sheet by adding 40 to 150 parts by weight of an uncured or biocured thermosetting resin to 100 parts by weight of an unapplied powder coating.