JPH0116870B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to an ultra-light chipping-resistant paint in which a part of the filler component blended in a vinyl chloride plastisol-based chipping-resistant paint is replaced with a plastic hollow filler.

B. Conventional technology In recent years, vinyl chloride plastisol (PVC) has been used instead of the conventional bituminous undercoat material for the undercoat, side seals, fuel tanks, front aprons, and tire houses of automobiles to protect them from damage caused by flying stones. A coating material called an anti-chip material (hereinafter also referred to as "vinyl chloride sol") is generally applied using an airless coating device.

In addition, as a technique for using hollow fillers, hollow fillers are exemplified as filler components in baked-on soundproofing paints consisting of a rubber component and a filler component (Japanese Patent Laid-Open No. 55-58261 et al. A hollow material is exemplified as a filler in a rubber asphalt emulsion in a soundproofing/vibration proofing method in which a rubber asphalt emulsion and a coagulant composition are applied (Japanese Patent Laid-Open No. 60-87879). There is only technology,
The only technology that uses hollow fillers for the purpose of reducing the weight of chipping-resistant paints is proposed in Japanese Patent Application No. 60-240474 filed by the present applicant.

C Problems to be Solved by the Invention On the other hand, in order to extend the service life of vehicles and improve the level of rust prevention requirements, there are major market needs for expanding the coating area and increasing the coating thickness of the above-mentioned PVC sol-based chipping-resistant paint. I'm getting old. However, such measures have the problem of immediately increasing the weight of the vehicle, deteriorating driving performance, and going against the energy savings achieved by reducing the weight of the vehicle.

D. Means for Solving the Problems The present inventors have conducted intensive research to find a chipping-resistant paint that can be made lighter without reducing the chipping-resistant performance per unit coating amount. Among the hollow fillers exemplified as filler components of the above-mentioned paint-type soundproofing/vibration damping materials, plastic materials are used in 0.5 to 0.5% of the filler components used in PVC sol-based chipping-resistant paints. Surprisingly, by replacing 5% by weight, preferably 1 to 3% by weight, all the above problems were solved,
In addition, it has been discovered that the particle size is small and it is extremely lightweight, making it an excellent chipping-resistant paint that does not cause any uneven coating.

E Effect The hollow plastic filler has a lower specific gravity than the filler used in conventional chipping-resistant paints, so the specific gravity of the chipping-resistant paint as a whole also decreases.
It becomes 1.05-1.15 from 1.35-1.55, which is a decrease of 0.3-0.5.

Furthermore, there is no problem in that the original performance of the chipping-resistant paint deteriorates due to replacing 0.5 to 5% by weight of the conventionally used filler components with hollow fillers.

F Composition Vinyl chloride plastisol is made by dispersing vinyl chloride resin in a plasticizer and adding fillers and additives. Vinyl chloride resins include polyvinyl chloride, polyvinylidene chloride, It is preferable to use homopolymers such as, copolymers of vinyl chloride, vinyl acetate, vinylidene chloride, etc.

As the plasticizer, phthalate ester, dibasic acid ester, phosphate ester, polyester plasticizer, etc. are used, and DOP is particularly preferably used.

Conventionally used fillers include powders such as talc, calcium carbonate, diatomaceous earth, mica, kaolin, barium sulfate, magnesium carbonate, erosil, vermiculite, graphite, alumina, silica, and rubber; Colorants such as titanium, carbon black, etc. may also be used.

Examples of the plastic hollow filler compounded as an essential component of the present invention include polyolefin resins, polyvinyl chloride resins, polystyrene copolymer resins, amino resins, phenolic resins, and unsaturated polyester resins.

In the present invention, it is essential to replace 0.5 to 5% by weight of the total filler with plastic hollow filler; if the amount is less than 0.5% by weight, the weight reduction effect will be diminished, and if it is replaced by more than 5% by weight, the effect of weight reduction will be diminished. , there is a risk that the chipping resistance performance will deteriorate.

The hollow filler used in the present invention needs to have a strength of about 120 kg/cm ² at least enough to prevent the plastic hollow filler from being crushed when the chipping-resistant paint is applied by airless spraying or the like. However, when applying, you can use not only airless spray but also brushing.
In such a case, there is almost no need to consider the strength of the hollow filler.

Plastic hollow fillers can be used as long as they have a particle size of 200μ or less, and preferably 95% of the whole filler passes through 150 meshes (approximately 100μ or less).
If the particle size is too large, the pattern width may vary in airless spraying, gun clogging may occur, and the finished surface may become rough. Furthermore, if the particle size is too small, the compressive strength will drop and the ultra-light weight reduction effect will not be achieved, so it is better to avoid this as much as possible.

Plastic hollow fillers can be used if the bulk specific gravity is 0.1 or less, preferably 0.02 to 0.05.
It is. That is, if the plastic hollow filler has high strength, it is more preferable that the bulk specific gravity is small.

The ultra-light chipping-resistant paint of the present invention contains conventional preservatives, dispersants, thickeners, thixotropic agents, antifreeze agents,
Additional additives such as PH regulators can be added.

G Examples, Comparative Examples Examples Polyvinyl chloride resin (consisting of polyvinyl chloride resin and vinyl chloride-vinyl acetate copolymer resin) 100 parts by weight DOP 100 parts by weight Calcium carbonate 150 parts by weight Carbon black 1 part by weight Expancel DE (manufactured by Nippon Flight Co., Ltd.)
A vinyl chloride sol-based ultra-light chipping-resistant paint was obtained from a paint composition consisting of 3 parts by weight of a dispersant and 5 parts by weight.

Comparative Example 1 Coating composition consisting of polyvinyl chloride resin (consisting of polyvinyl chloride resin and vinyl chloride-vinyl acetate copolymer resin) 100 parts by weight DOP 100 parts by weight calcium carbonate 170 parts by weight carbon black 1 part by weight dispersant 5 parts by weight A PVC sol-based chipping-resistant paint was obtained.

The paints used in Examples and Comparative Examples were applied to test panels to give a dry thickness of 850μ.

Test method The weight per liter of the paints used in Examples and Comparative Examples was measured.

Place the bottom end of a 2m long PVC pipe with a diameter of 20 mm, which is set perpendicularly on the coating surface set at a 45° angle.
-4 nuts are allowed to fall and evaluated based on the total weight until the base material is exposed.

Test results Example 1090g/l 65Kg Comparative example 1440g/l 65Kg H Effects of the invention The ultra-lightweight chipping-resistant paint of the present invention maintains chipping performance as before, while maintaining the same chipping performance as before.
It became clear that it was possible to achieve a weight reduction of 30%.

Claims (1)

[Claims] 1. An ultra-light chipping-resistant paint characterized by replacing 0.5 to 5% by weight of the filler component of a vinyl chloride plastisol-based chipping-resistant paint with a hollow plastic filler.