JPH05247384A - Body sealer - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object to provide a body sealer suitable for use as a robot coating type spray body sealer. [Structure] A body sealer composed mainly of vinyl chloride plastisol, which is used in the assembly process of vehicles where the intermediate coating material is applied wet-on-wet
It is characterized by containing 7 to 15 parts by weight of a high boiling point solvent as 00 parts by weight.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention applies a wet-on-wet (hereinafter referred to as W / W) intermediate coating inner plate color after sealing a joint gap of a steel plate of a vehicle using a robot. The present invention relates to a body sealer suitable as a robot-applied spray body sealer, which is used as a body sealer in the case.

[0002]

2. Description of the Related Art In automobiles, for example, a body sealer is applied under an intermediate coating for the purpose of rust prevention and dust prevention due to filling, for example, in a joint gap of steel plates. The concrete steps are summarized as follows. That is, the body sealer is applied to the steel plate joint, the outer plate is applied with an intermediate coating, and the inner plate (door interior, trunk room, engine room) is applied with an intermediate coated inner plate color similar to the top coating color,
Blackout painting (door frame, rocker part) (however, blackout does not depend on the car model), baking, masking the blackout exterior,
The steps of top-coating the outer plate and finishing baking (the steps of ~ are repeated depending on the vehicle type) are performed.

[0003]

In the above steps (1) to (4), for example, after the body sealer is applied and then the paint is applied to the inner plate portion with W / W, the plasticizer in the body sealer remains in the paint in this step. Depending on the solvent, it is dissolved and extracted, causing paint defects such as glossiness and cissing. It has been conventionally known that a polymer type plasticizer, which is hard to be dissolved in a solvent in a paint, is effective as a measure for preventing such a coating defect. Such polymer type plasticizers are used as ordinary plasticizers for body sealers, but their viscosity is extremely high compared to general-purpose type plasticizers, and body sealers using this polymer type plasticizer are also used. Naturally, there is a problem that the viscosity is high and it is not suitable as a robot coating type spray body sealer. It is an object of the present invention to solve the above problems and provide a body sealer suitable for use as a robot coating type spray body sealer.

[0004]

In order to solve the above-mentioned problems, the inventors of the present invention set a proper viscosity at a temperature of 20 ° C to 35 ° C when spraying a body sealer on a joint portion by a robot. There are various things such as being equipped, that it does not overflow during the heating process during and after coating, that it can be formed into a thin film and that it has good adhesion to the vehicle part, and that the finish of W / W coating is good. As a result of examination, the conventional W
It was found that the above problem can be solved by using an appropriate amount of a high boiling point solvent in a body sealer mainly composed of vinyl chloride-based plastisol, which has a good / W coating finish, but robot spraying work was impossible. Completed sealer, body sealer mainly composed of vinyl chloride plastisol used in the assembly process of vehicles etc. where the intermediate coating paint is painted wet on wet,
The total amount is 100 parts by weight, and the high boiling point solvent is contained in an amount of 7 to 15 parts by weight.

In this case, 5 to 15 parts by weight of paste type vinyl chloride resin, 5 to 15 parts by weight of vinyl chloride / vinyl acetate copolymer resin, 0 to 10 parts by weight of blend type of vinyl chloride resin are used as 100 parts by weight in total. Inorganic filler 2
0-40 parts by weight, pigment 0.5-2 parts by weight, chemicals 0.5-
3 parts by weight, adhesion promoter 3 to 10 parts by weight, plasticizer 25 to 5
It is preferable to contain 0 parts by weight and 7 to 15 parts by weight of the high boiling point solvent.

As the paste type vinyl chloride resin,
A polymerization degree of about 1000 to 2000 is used, and the blending amount thereof is preferably 5 to 15 parts by weight from the viewpoint of economy and workability.

The vinyl chloride vinyl acetate copolymer resin has a degree of polymerization of about 1000 to 2000 and a vinyl acetate content of 5 to 5.
About 15% is used, and the blending amount is preferably 5 to 15 parts by weight from the viewpoint of economy and physical properties.

As the blend type vinyl chloride resin, one having a degree of polymerization of about 800 to 1500 is used, and if the blending amount exceeds 10 parts by weight, the smoothness at the time of coating is deteriorated and the coating finish on the sealing material is poor. Therefore, the amount is preferably 10 parts by weight or less.

Calcium carbonate, calcium silicate, bentonite, etc. are used as the inorganic filler, and the blending amount thereof is preferably 20 to 40 parts by weight from the viewpoint of preventing sagging during coating and heat treatment and from the economical viewpoint. ..

It is particularly preferable that the surface-treated calcium carbonate is contained as an inorganic filler in an amount of 10 parts by weight or more because the sagging resistance becomes very excellent.

Titanium white or the like is used as the pigment, and the blending amount thereof is 0.5 to 2 parts by weight from the viewpoint of the overall coating finish including white, light color and dark color paints. preferable.

As the chemicals, tin compounds, zinc compounds, calcium compounds and the like are used, and the compounding amount thereof is preferably 1 to 3 parts by weight from the economical viewpoint.

The adhesion-imparting agent is added in order to improve the adhesiveness to the adherend and enhance the sealing effect, and polyamide-based resins, acrylic-based resins, isocyanate-based resins, etc. are used, and their compounding amounts. If it is less than 3 parts by weight, the adhesiveness to the adherend tends to decrease, and if it exceeds 10 parts by weight, the economical efficiency and workability are deteriorated, so 3 to 10 parts by weight is preferable.

As the plasticizer, a polyester type, a phthalic acid ester type or the like is used. If the amount of the plasticizer is less than 15 parts by weight, the effect of finishing the coating is not sufficiently exhibited, and if it exceeds 30 parts by weight, the economical efficiency is impaired. It is preferably 30 parts by weight.

Further, it is particularly preferable to use a general-purpose phthalic acid type and polyester type in combination, and in this case, the compounding amount is 20 to 50.
It is preferable that the weight ratio and the compounding ratio of both are about 30:70. The purpose of using the polyester-based plasticizer together is that it is most suitable for improving the finished appearance on a line without a calcination step during the coating step and for obtaining a clear coating gloss. That is, if a solvent such as a polar solvent such as alcohol, ester, ketone or ether is contained in the intermediate coating or top coating, the phthalic acid plasticizer in the body sealer is easily extracted into the coating due to the influence of this solvent. However, it lowers the surface tension of the paint and causes repelling and luster, but the polyester type is not easily extracted and is suitable as the finish of the coating.

As the high boiling point solvent, a solvent that dissolves the vinyl chloride resin thickens, resulting in poor workability. Therefore, it is difficult to dissolve the vinyl chloride resin, and the body sealer does not foam when heated. Further, a solvent having a boiling point of 180 ° C. or higher is preferable, and it is preferable to use a nonpolar solvent in which naphthene and paraffin are used in combination.

[0017]

By blending a predetermined amount of the high boiling point solvent, the viscosity of the solvent will be suitable for use as a robot coating type spray body sealer while maintaining the characteristics as a body sealer.

[0018]

EXAMPLES Examples of the present invention will be described in detail below. A body sealer was prepared according to the blending ratio shown in Table 1 below, and the paintability, spray workability, adhesiveness, and sag resistance of each of the obtained body sealers were tested and evaluated. The test method and evaluation criteria are as follows.

1) Finishing paintability After applying the body sealer, white, red, and black paints are applied on the surface in a wet state, and then the temperature is 140 °.
C, heat treatment for 30 minutes, visually observe the coated surface,
The following criteria were used for evaluation. ◎ The coated surface of the sealing material is glossy and non-repellent. × The coated surface of the sealing material is non-luster and repelled.

2) Spray workability Spray application work was carried out using a robot at a temperature of 20 ° C. to 35 ° C. and visually observed, and the finish was evaluated according to the following criteria: ◎ Smooth smoothness ○ Skin There is some unevenness on the but pass level × Large unevenness on the skin

3) Adhesive property JASO, M306-88 using a cationic electrodeposition coated plate
It was evaluated by the test specified in. However, the temperature is 140 ° C,
The sample thickness was 1 mm for 30 minutes. ◎ Adhesive strength Cohesive failure at 15 kg / cm ² or more

4) Drip resistance Using a cationic electrodeposition coated plate, radius 5 mm width, length 100
After being vertically sealed at a room temperature of 20 ° C to 23 ° C for 30 minutes, the flow distance after vertical holding at a temperature of 140 ° C for 30 minutes was measured and evaluated according to the following criteria. ◎ Sagging 10mm or less ○ Sagging 11 to 15mm × Sagging 16mm or more

[0023]

[Table 1]

As a result, as shown in Table 2, the body sealers of Examples 1, 2, 3, 4, and 5 of the present invention were compared with Comparative Example 1,
Compared to the 2 body sealer, it is a well-balanced robot coating spray body sealer that has a good finish in the W / W process, spray workability by a robot, adhesion, sagging resistance, etc. confirmed.

[0025]

[Table 2]

[0026]

As described above, the body sealer of the present invention is a body sealer mainly composed of vinyl chloride plastisol, which is used in the assembling process of a vehicle or the like in which the intermediate coating material is applied wet on wet. By adding 7 to 15 parts by weight of a high boiling point solvent as a part by weight, a robot coating type spray body sealer which can be sprayed, has good W / W coatability and has excellent adhesion to a cationic electrodeposition plate Can be provided.

Continued Front Page (72) Inventor Akihito Takahashi 1-10-1 Kyobashi, Chuo-ku, Tokyo Asahi Corporation (72) Inventor Yoshio Shimizu 1-1-10 Kyobashi, Chuo-ku, Tokyo Stock Company Asahi Corporation

Claims (3)

[Claims] 1. A body sealer mainly composed of vinyl chloride plastisol, which is used in an assembling process of a vehicle or the like in which an intermediate coating material is applied wet-on-wet, the total amount of which is 100 parts by weight, and a high boiling point solvent is 7 to 7. A body sealer containing 15 parts by weight. 2. A total of 100 parts by weight, paste type vinyl chloride resin 5 to 15 parts by weight, vinyl chloride vinyl acetate copolymer resin 5 to 15 parts by weight, blend type vinyl chloride resin 0 to 10 parts by weight, inorganic filler. 20 to 40 parts by weight, pigment 0.5 to 2 parts by weight, chemicals 0.5 to 3 parts by weight, adhesion promoter 3 to 10 parts by weight, plasticizer 25 to 50 parts by weight and high boiling point solvent 7 to 15 parts by weight. The body sealer according to claim 1, wherein the body sealer is contained in a mixing ratio. 3. The body sealer according to claim 1, which contains 10 parts by weight or more of surface-treated calcium carbonate as an inorganic filler.