JPH0481441A - Vinyl chloride resin composition - Google Patents

Abstract

PURPOSE:To obtain a vinyl chloride resin composition having small linear expansion coefficient and useful for a molded article having excellent physical properties and appearance, especially rainwater guttering, deck material, window sash, etc., by compounding a vinyl chloride resin with wollastonite and a resinous processing assistant. CONSTITUTION:The objective composition contains (A) 100 pts.wt. of a vinyl chloride resin, (B) 1-50 pts.wt. of wollastonite having an average particle diameter of preferably <=20mum, produced by crushing a mineral having the composition of formula I and optionally surface-treated with a silane coupling agent, an organic titanate, a fatty acid, etc., (C) 0.1-10 pts.wt. of a resinous processing assistant selected from a methyl methacrylate copolymer and a polyester processing assistant and, as necessary, (D) 1-50 pts.wt. of mica (preferably muscovite or phlogopite) and/or 1-50 pts.wt. of talc having the mineral composition of formula II.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is directed to a chloride resin suitable for molded products having a small coefficient of linear expansion and excellent physical properties and appearance, especially molded products such as rain gutters, decking materials, window frames, etc. The present invention relates to vinyl resin compositions.

[Conventional technology]

In recent years, molded products made of vinyl chloride resin, such as rain gutters made of hard vinyl chloride resin, have come into widespread use, but rain gutters made of hard vinyl chloride resin have a lower coefficient of linear expansion than metal rain gutters. During use, the parts that are exposed to direct sunlight may expand or bend due to thermal expansion. It had the disadvantage of being easily deformed.

As a method to improve these, JP-A-57-34147
In the publication, as described below, vinyl chloride resin 10
6 to 20 parts by weight of mica and 15 parts by weight of calcium carbonate
A high-rigidity vinyl chloride resin composition containing up to 50 parts by weight has been proposed.

Furthermore, JP-A No. 60-179444 discloses that the above-mentioned resin composition contains glass single fibers, chlorinated plastic IJ, impact modifiers such as ethylene, ethylene-vinyl acetate copolymer and ABS resin, polymethyl methacrylate and Vinyl chloride resin compositions containing processing aids such as methyl methacrylate-acrylonitrile-styrene copolymers have been proposed.

[Problem to be solved by the invention]

However, in the conventional method, the adhesion between the added mica and the vinyl chloride resin is poor, and large voids occur around the mica. Physical properties such as impact resistance of the molded product are significantly reduced, and because large amounts of calcium carbonate and short glass fibers are added, the surface of the molded product is not smooth, which not only causes a poor appearance but also causes When used outdoors, there was a problem with whitening (chalking) within a short period of time.

As a result of various studies aimed at solving all of these problems, the present inventor found that
Adding wollastonite or wollastonite and mica and/or talc to the vinyl chloride resin improves the adhesion between the wollastonite, mica, Merck and the resin, and improves the kneading during molding. The present invention has been completed based on the knowledge that the above-mentioned conventional problems can be solved by adding a resinous processing aid that softens the process.

[Means to solve the problem]

The present invention will be explained in detail below.

1. 100 parts by weight of vinyl chloride resin, 1 to 50 parts by weight of wollastonite, and 0.1 to 10" x resinous processing aid.
100 parts by weight of a vinyl chloride resin, 1 to 50 parts by weight of wollastonite, 0.1 to 10 parts by weight of a resinous processing aid, and 1 to 10 parts by weight of mica. It is characterized by a vinyl chloride resin composition containing a 50TL lid and/or 1 to 50 parts by weight of talc.

The wollastonite used in the present invention has a mineral composition of Ca
Minerals indicated by ○.5i02 are obtained by crushing ores, and those having an average particle size of 20 μm or less are preferably used. Further, wollastonite may be used after surface treatment with a silane coupling agent, organic titanate, fatty acid, etc., if necessary. In the present invention, the amount of wollastonite added is closely related to the moldability, impact resistance, and coefficient of linear expansion of the molded product to be obtained, and also facilitates the dispersion of other fillers such as mica and Merck. The additive lid contains 1 to 5 ON for the vinyl chloride resin 1001 lid part.
The lid area is preferred. Addition lid of wollastonite is 1
If it is less than 50 parts by weight, a sufficient effect cannot be expected in improving the moldability, impact resistance, and coefficient of linear expansion of the molded product, and if it is added in excess of 50 parts by weight, it may cause di-molded products with poor moldability. The appearance is not smooth and the impact resistance deteriorates, which is undesirable.

As the mica used in the present invention, for example, muscovite (white mica) and phlogovite (phlogopite) are preferably used, and mica having an average particle diameter of about 20 μm is preferably used. Further, mica may be used after surface treatment with a silane coupling agent, organic titanate, fatty acid, etc., if necessary. In the present invention, the amount of mica added is closely related to the moldability, impact resistance, and coefficient of linear expansion of the molded product to be obtained, and the amount added is 1 to 50 parts by weight per 100 parts by weight of the vinyl chloride resin. Parts by weight ranges are preferred. If the amount of mica added is less than 1 part by weight, a sufficient effect in improving the moldability, g# impact resistance and linear expansion coefficient of the molded product cannot be expected;
If it is added beyond the M lid part, the moldability will be poor, the appearance of the molded product will not be smooth, and the impact resistance will be poor, which is not preferable.

Merck used in the present invention has a mineral composition of Mg5 (
The mineral represented by SitOloXOHUz is obtained by crushing ore, and those having an average particle size of 10 μm or less are preferably used. Further, Merck may be used after surface treatment with a silane coupling agent, organic titanate, fatty acid, etc., if necessary.

In the second aspect of the present invention, Merck imparts rigidity to the molded product to make it difficult to deform due to heat, and the amount added is preferably in the range of 1 to 50 parts by weight per 100 parts by weight of the vinyl chloride resin. . If Merck's addition lid is less than 1 part by weight, it cannot be expected to have a sufficient effect in imparting rigidity to the molded product, and if it is added in excess of 50 parts by weight, M impact strength and weather resistance will be poor. do not have.

Furthermore, the resin composition of the present invention is a resinous processing aid? When added to the system, it improves the adhesion between wollastonite, mica, talc, and vinyl chloride resin, and minimizes the voids that occur around fillers such as wollastonite, mica, and Merck. , the impact resistance S strength r of the molded product can be increased. As the resinous processing aid, at least one selected from methyl methacrylate copolymers and polyester processing aids can be used. If the amount of the resinous processing aid added is in the range of 0.1 to 10 parts per 100 parts of vinyl chloride resin, the impact resistance and moldability of the molded product will be improved without increasing the coefficient of linear expansion. can be improved. If the resinous processing aid is added in a small amount (less than 0.1 part by weight), no significant effect can be expected in improving the #f resistance ε of the molded product, and if it is added in a large amount exceeding 10 parts by weight, If iff K & is added, the O-linear expansion coefficient of the molded product becomes large (which is not preferable).

In addition, in the composition of the present invention, stabilizers, lubricants, colorants, ultraviolet absorbers, etc. used in ordinary vinyl chloride resins may be added, although there are no particular restrictions.

The vinyl chloride thread resin composition thus obtained has a low coefficient of linear expansion of the molded product, so thermal deformation due to temperature changes is unlikely to occur, and it also has excellent impact resistance and poor moldability. The surface condition of the molded product is very clean (), and because of this, it does not turn white (white) within a short period of time when used outdoors.
This gives you the advantage of not having to worry about choking.

〔Example〕

The present invention will be explained below using examples.

(Examples 1 to 11) The formulations shown in the table were mixed using a Henschel mixer (Mitsui Miike Co., Ltd.).
The mixture was mixed for 60 minutes using a 40 m/mψ single-screw kneading extruder (manufactured by Tanabe Glasstics Co., Ltd.) and kneaded into pellets. Obtained pellet l-f: 40m
/mψ Single-screw kneading extruder with resin temperature of 190-195°
C, to extrude a irregularly shaped article with a thickness of 2RI.

Test pieces were cut out from the molded product, and the coefficient of linear expansion, tensile strength, elongation, and weather resistance were measured, and the dense layer between the resin and fillers such as wollastonite, mica, and Merck in the molded product was measured. Observed. The results are shown in the table as Examples 1 to 11.

(Comparative Example 1.2) Using all the formulations shown in the table, test pieces were prepared in the same manner as in Example 1.2, and various tests were conducted. The results are shown in the table as Comparative Example 1.2.

As is clear from the table, in all cases of Examples 1 to 11, the coefficient of linear expansion was improved to the extent that it was comparable to that of Comparative Example 10, which did not contain any filler. In addition, the surface of the molded product was smooth and uniform, and was extremely good. Furthermore, it was observed that these fillers and the resin were in close contact with each other, with only very small voids partially visible around the fillers such as wollastonite, mica, and talc. Sexuality has also improved.

Furthermore, the weather resistance is improved to the extent that it is comparable to Comparative Example 1, which does not contain a filler. On the other hand, as is clear from the table, in the case of Comparative Example 1, the I@expansion coefficient is extremely high and the shell is easily deformed due to temperature changes. Also, comparative example 2
In this case, the dispersion of mica is poor, and as a result, the moldability and weather resistance are so poor that they cannot be used for practical purposes. Not only that, but the impact resistance was also extremely weak.

(Materials used) 1. Vinyl chloride resin 2F? ! 8 product names: Denkabinir SS
-110 (manufactured by Denki Kagaku Kogyo Co., Ltd.) 2. Mica: Product name A-218 (manufactured by Yamaro Mica Kogyo Co., Ltd.) 5. Talc; Product name - Itron A (manufactured by Takehara Chemical Industry Co., Ltd.) 4 , calcium carbonate: trade name MS-
400 (manufactured by Nitto Funka Kogyo Co., Ltd.) 7. Lead-based stabilizer: Product name TS(E) (manufactured by Nitto Kasei Kogyo Co., Ltd.) 8. Metallic soap: Product name MS-100 (Kikuchi Color Industries Co., Ltd.)
S) (Measurement method) 1. The coefficient of linear expansion was measured using a strain meter (HTDS-301, manufactured by Tokyo Model Research Institute, Ltd.) and a strain gauge (GFLA6-70, manufactured by Tokyo Model Research Institute, Ltd.). did.

2. Tensile strength and elongation were measured according to JISA5706.

3. The outdoor rough road test was measured according to JIS Al 410.

4. To check the adhesion between the mica and resin in the molded product, inspect the cross section of the test piece using an electron microscope and check the occurrence of voids around the filler such as wollastonite, mica, Merck, etc. Judging by that.

Good: When the cross section of the molded article was observed using an electron microscope at a magnification of 600 times, the mica and resin were in good contact with each other.

Bad: When the cross section of the molded product was observed with an electron microscope at 600x magnification, there was a gap between the mica and the resin.

5. Moldability and surface condition of the molded article were determined by the smoothness of the surface of the irregularly shaped article obtained by extrusion molding.

Good: It was possible to mold into different shapes, and the surface was glossy and smooth.

Bad: It was possible to mold into different shapes, but the surface was not glossy and smooth.

6. Impact resistance was determined by repeatedly bending a 20-thick profile molded product obtained by extrusion at 180 degrees.

◎: Endured bending 5 times or more.

Destroyed in 013-4 times.

Destroyed with Δ2 1-2 times.

X: Broken during bending.

〔Effect of the invention〕

As described above, when the resin composition of the present invention is made into a molded product, there is no decrease in impact resistance, coefficient of linear expansion, or tensile strength, and the molding processability is excellent, and the surface of the molded product is smooth and has excellent appearance. It is particularly useful for producing molded products such as rain gutters, decking materials, and window frames.

Patent applicant Denki Kagaku Kogyo Co., Ltd.

Claims (1)

[Scope of Claims] 1. A vinyl chloride resin composition comprising 100 parts by weight of a vinyl chloride resin, 1 to 50 parts by weight of wollastonite, and 0.1 to 10 parts by weight of a resinous processing aid. 2. Contains 100 parts by weight of vinyl chloride resin, 1 to 50 parts by weight of wollastonite, 0.1 to 10 parts by weight of a resinous processing aid, and 1 to 50 parts by weight of mica and/or 1 to 50 parts by weight of talc. A vinyl chloride resin composition.