JPS636044A - Stain-resistant automobile part - Google Patents

Abstract

PURPOSE:To provide automobile parts having excellent stain resistance, by molding a compsn. contg. a vinyl chloride resin, a plasticizer and silicone oil. CONSTITUTION:100pts.wt. vinyl chloride resin having a degree of polymn. of 900-3,000 is blended with at least 30pts.wt. plasticizer [e.g., di-(2-ethylhexyl) phthalate] and 0.1-10pts.wt. silicone oil having a viscosity of 400-5,000cst (e.g., polymethylphenylsiloxane having a phenyl group content of not lower than 5mol%). If desired, the resulting compsn. is blended with 0.5-10wt% stabilizer (e.g., epoxidized soybean oil), a filler (e.g., CaCO3), a pigment, a processing aid, etc. The compsn. is molded into automobile parts such as side protect lace, splash pad, mudguard, etc.

Description

[Detailed description of the invention] [Industrial application field] TECHNICAL FIELD This invention relates to stain-resistant automotive parts.

[Conventional technology and its problems]

Many parts made of vinyl chloride resin are used for the interior and exterior of automobiles. Among these, for example, there are band-shaped parts that are attached to the outer surface of a car body for the purpose of protecting and decorating the body, but when ordinary plasticized PVC resin is used, asphalt is attached to the surface of the part made of PVC resin. Dirt such as dirt, muddy water, lumps, etc. may adhere strongly and cannot be completely removed even if the car is washed.

In particular, the amount of plasticizer contained in the resin is large, and vinyl chloride resin 1
When the plasticizer contains 60 parts by weight or more based on 00 parts by weight, the staining is particularly significant.

The above-mentioned stain adhesion is caused by the migratory nature of plasticizers, so we recommend using plasticizers with low migratory properties, such as plasticizers made of polymeric compounds such as polyester, and trimellitic acid ester plasticizers. It has been attempted to use it, and it is known that it can reduce dirt adhesion to some extent, but its effectiveness as a plasticizer may not be sufficient, and it is more expensive than the commonly used oop (dioctyl phthalate). Therefore, it has the disadvantage of being economically disadvantageous.

Accordingly, one object of the present invention is to provide automobile parts made of vinyl chloride resin that have high stain resistance and are resistant to staining even when a large amount of a general-purpose plasticizer such as DOP is blended as a plasticizer.

Means for Solving Problem c] That is, the present invention comprises a vinyl chloride resin, 30 parts by weight or more of a plasticizer, and 0.9 parts by weight or more of a plasticizer per 100 parts by weight of the vinyl chloride resin.
The present invention provides a stain-resistant automobile part comprising a molded product of a composition containing 1 to 10 parts by weight of silicone oil.

The vinyl chloride resin used in the present invention is not particularly limited, but preferably has a degree of polymerization of 900 to 3,000. Of course, a polymer with a higher degree of polymerization can be used, but for parts such as side moldings, the above range is preferable from the viewpoint of economy and ease of molding.
If it is less than 0, the migration of the plasticizer will be high and the resulting product will have poor physical properties. - Elasticity of mudguards, etc.
For parts requiring fatigue resistance, vinyl chloride resin with a degree of polymerization of 3000 or more is also used.

The plasticizer used in the present invention is not particularly limited, and those commonly used for soft vinyl chloride resins can be used.For example, phthalate esters such as DOP, di(2-ethylhexyl) phthalate, dibutyl phthalate, and diisodecyl phthalate. These include linear dibasic systems such as dioctyl adipate and dioctyl sebacate, phosphate ester systems such as triphenyl phosphite, trimellitic acid ester systems, and polyester-based epoxy compounds. It can also be used in combinations of more than one species. This plasticizer is used in an amount of 30 parts by weight or more, usually in the range of 50 to 100 parts by weight, per 100 parts by weight of the vinyl chloride resin, but according to the present invention, even if the plasticizer content is 60 parts by weight or more, Automotive parts with high stain resistance can be obtained. If the plasticizer content is less than 30 parts by weight, the hardness etc. of the molded part will be insufficient, which is not preferable. Furthermore, when the amount is less than 30 parts by weight, the migration of the plasticizer is low, so the problem of contamination is small, and the practical effect of the present invention is small.

The silicone oil used in the present invention serves to significantly improve the stain resistance of automobile parts. Examples of the silicone oil to be used include dimethylpolysiloxane, methylphenylpolysiloxane, etc., and silicone oils containing phenyl groups as organic groups are desirable because they have good affinity with vinyl chloride resin.
Particularly preferred is polymethylphenylsiloxane thin film containing 5 mol% or more of phenyl groups. Silicone oil is desirable in terms of formulation and molding process, and the amount of silicone oil is 0.1 to 10 parts by weight, preferably 0.2 to 3 parts by weight, per 100 parts by weight of vinyl chloride resin. If the amount used is less than 0.1 part by weight, the above-mentioned effect of addition cannot be obtained, and 1
If the amount exceeds 0 parts by weight, the molding processability of the composition will deteriorate significantly, making it difficult to obtain a good product using normal molding methods, and also causing adhesion between products due to silicone oil oozing onto the product surface. This may cause problems such as poor adhesion to members and parts made of materials such as metal and metal.

Other stabilizers, pigments, fillers, processing aids, etc. may be appropriately blended as components of the composition used in the present invention, and the types thereof are not particularly limited. Examples of stabilizers include cadmium, barium, zinc, Metal soaps such as calcium, dialkyl tin laurate, malate, mercaptide, etc., organic or inorganic compounds of lead, epoxidized soybean oil, phosphites, phenol derivatives, salicylic acid esters, benzotriazole derivatives, polyhydric alcohols,
Examples include nitrogen-containing compounds, sulfur-containing compounds, keto compounds, organosilicon compounds, and oxalic acid esters.

These are usually added in an amount of 0.5 to 10% by weight in the composition. Examples of fillers include calcium carbonate,
Examples include talc and clay, and examples of processing aids include polymethyl methacrylate and polyester. In addition, as appropriate additives, 1
Those normally used for soft vinyl chloride resins can be used.

The automobile parts of the present invention are manufactured by molding a composition containing the above-mentioned components by extrusion molding, injection molding, or a combination of both.

Examples of the automobile parts of the present invention include band-shaped parts (side protection moldings) attached to the outer surface of the automobile body for protection and decoration, mudguards, etc., and in particular band-shaped parts used on the outer surface of the body ( Effective for side protection moldings) and splash pads.

〔Example〕

Hereinafter, this will be explained in detail using examples.

Four mixtures of Example 1.2 and Comparative Example 1.2 shown in Table 1 were prepared using the following materials.

0 Vinyl chloride resin TK-2 manufactured by Shin-Etsu Chemical Co., Ltd.
500H (degree of polymerization approximately 2500) Plasticizer DOP Trioctyl trimellitate 0 Silicone oil F-54 manufactured by Shin-Etsu Chemical Co., Ltd. (Methylphenyl silicone oil.

Phenyl group content 25 mol%) 0 Stabilizer RUP-1 manufactured by Adeka Argus
1 (Barium/zinc type) Epoxidized soybean oil The mixtures of each of the Examples and Comparative Examples were heated and mixed to 120°C, cooled, and then taken out to obtain a powder compound. This powder compound was extruded using a twin-screw extruder and pelletized using a hot cut method, with a diameter of 3 mm,
A cylindrical pellet compound with a length of about 3 m+s was obtained.

Using these compounds, the thickness of 1
A strip-shaped product with a width of 100 mm and a width of 100 mm was extruded, and the stain resistance of the product was evaluated as follows.

Shi BJl14 Gonghuang Asphalt Powder (60 mesh sieve) 380g carbon black 170g cement
170g white carbon 170g bentonite
85g kaolin
85gFe2O, powder
5 g Turbine oil 87 g The contaminated compound consisting of the above formulation is placed in a wide roboribin with an internal volume of about 5 Q and mixed well.

Next, samples cut into 100 mm lengths from the above-mentioned strip-shaped product and those treated with a weatherometer for 100 hours and 500 hours were placed in the polyethylene bottle, shaken thoroughly with the contaminated compound, and kept at 80°C. Place the entire plastic bottle in a heated gear oven, leave it for 15 minutes, shake well, and place it in a gear oven maintained at 80°C. After heating in a gear oven at 80° C. for 1 hour while repeating this shaking operation once every 15 minutes, the sample was taken out from the gear oven and left to cool to room temperature while remaining in the polyethylene bottle. After cooling, the measurement sample was taken out of the plastic bottle, and the contamination compound on the sample was brushed off with a soft brush to remove dirt on the sample, and the degree of contamination was evaluated according to the following criteria.

〔Judgment criteria〕

O: No stains left at all 0: Slight dirt remains ×: Very dirty and the color of the sample surface cannot be discerned The above evaluation results are shown in Table 1.

〔Effect of the invention〕

Automotive parts made of the vinyl chloride resin composition of the present invention are less prone to contamination even when a large amount of a general-purpose, inexpensive plasticizer such as 00P is used, and contamination can be easily removed by washing with water, etc. .

Agent Patent attorney Zhou Iwamiya Zhi procedure Nefusho (self-motivated) April 16, 1982 1, case description 1985 patent application No. 149185
No. 2°9 Name of the invention: Representative of stain-resistant automobile parts
Koita Yutabe 6, Number of inventions increased by amendment None 8,
Contents of the amendment The column for detailed description of the invention will be amended as follows.

Claims (1)

[Claims] A stain-resistant automobile part comprising a molded product of a composition containing a vinyl chloride resin, 30 parts by weight or more of a plasticizer, and 0.1 to 10 parts by weight of silicone oil per 100 parts by weight of the vinyl chloride resin.