JPS6333500B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a vinyl chloride resin composition that is stable against outdoor exposure. If a colored molded product made of vinyl chloride resin is used under direct sunlight, the surface of the exposed part will become white, as if it had been wiped with powder, and the original color tone of the molded product will change drastically, resulting in the molded product being damaged. It is well known that the appearance is significantly impaired. This phenomenon of whitish coloration occurs when exposed outdoors, but it is a unique phenomenon that cannot be reproduced with a weatherometer, which is commonly used as a weather resistance acceleration tester for synthetic resin molded products, and is called yoking. Rain gutters, decking materials, etc. are used outdoors for long periods of time, so when using vinyl chloride resin molded products for such purposes, various conventional methods have been used to suppress the occurrence of chocking and delay its occurrence. Stabilizers have been added to vinyl chloride resins. Among them, organotin compounds, cadmium metal soaps, and lead metal soaps are widely used because of their excellent anti-choke effect, but even if vinyl chloride resin compositions containing these stabilizers are used, their molded products cannot be processed. Chiyoking begins to occur after 2 to 10 months when exposed outdoors. In this way, even if the stabilizer has an excellent anti-yoking effect,
It could not be said to be sufficient for applications involving long-term outdoor exposure. Therefore, there has been a strong demand for a stabilizer that has a long-lasting inhibitory effect on yoking, and has been extensively researched, but no satisfactory stabilizer has yet been found. In view of this situation, the present inventors have conducted extensive research and found that certain acetate salts have a choking inhibiting effect, and that this effect lasts for a significantly longer period of time than conventionally used organotin-based compounds. They discovered that this is the case, and arrived at the present invention. That is, the present invention relates to a vinyl chloride resin composition characterized by containing at least one compound selected from the group of manganese acetate, cobalt acetate, and nickel acetate. Among the acetate salts (hereinafter referred to as choking inhibitors) used in the present invention, particularly preferred are manganese acetate, cobalt acetate, and nickel acetate. The composition of the present invention can be formed by adding and mixing a yoking inhibitor to a vinyl chloride resin, but the proportion of the yoking inhibitor used is 100 parts by weight of the vinyl chloride resin (described below).
The appropriate amount is usually 0.05 to 5 parts, preferably 0.5 to 2 parts. The vinyl chloride resin referred to herein refers to a homopolymer or copolymer containing vinyl chloride as a constituent monomer. These polymers may contain colorant components, plasticizers, heat stabilizers, modifiers, lubricants, and other known performance-enhancing components. Care should be taken when adding and mixing the yoking inhibitor to the vinyl chloride resin to achieve uniform dispersion, and for this purpose it is necessary to use it in the form of a fine powder and to thoroughly knead it. The mixing method is to add directly to the vinyl chloride resin and mix, or to mix it with the vinyl chloride resin, such as a coloring agent component, a plasticizer, a heat stabilizer, a modifier, a lubricant, etc. with well-known performance. Among these methods, the latter method is preferred because it is easier to uniformly disperse the improving component. In particular, when using a colorant component, sufficient consideration should be given to adjustment so that the colorant component can be uniformly and easily dispersed in the vinyl chloride resin, so a yoking inhibitor should be present in the dye and pigment when preparing the colorant. and,
This is suitable because their uniform dispersibility is particularly excellent. The form of the colorant component is a fine powder dry color, a wet type color produced by a grinding process, a pellet or plate masterbatch solidified with resin or other excipients, a plasticizer or other liquid or Good results can be obtained with any paste color using a low-temperature softening point compound as a vehicle. The thus obtained composition of the present invention is stable against outdoor exposure, and even when used for equipment and tools used outdoors, the occurrence of choking is significantly suppressed for a long period of time, so it is suitable for use in rain gutters, rain gutters, etc. Ideal for use as decking material, etc. The present invention will be explained below with reference to Examples. Note that the choke suppression coefficient in the examples was calculated from the following formula. △E _C - △E _I / △E _C ×100 △E _I = Color difference after outdoor exposure of a sheet of the composition of the present invention containing a yoking inhibitor △E _C = Same as above except that it does not contain a yoking inhibitor Color difference after a sheet of a composition comparison composition is exposed outdoors for the same period and under the same conditions as above. Therefore, the closer the value of this coefficient is to 100 for a certain outdoor exposure period, the better the yoking suppression effect is. . Example 1 Vinyl chloride resin (Sumitomo Chemical, Sumiritz)
SX11F, polymerization degree 1100) 100 parts Ca-Zn stabilizer (Interstub M62D manufactured by Nippon Interstub)
Three parts were added and mixed to obtain a compound. 103 parts of Kakaru compound, 0.7 parts of Bengara, titanium dioxide
Add and mix 0.5 part and 1 part of cobalt acetate, and heat to 155℃.
After kneading for 5 minutes using two 6-inch rolls, a sheet with a thickness of 1 mm was prepared using a hot press and exposed outdoors. Example 2 A sheet was prepared in exactly the same manner as in Example 1 except that the same amount of nickel acetate was used instead of cobalt acetate, and exposed outdoors. Comparative Example 1 A sheet was prepared in exactly the same manner as in Example 1 except that the same amount of dibutyltin dilaurate was used instead of cobalt acetate, and exposed outdoors. Table 1 shows the yoking inhibition coefficients after 16 months, 20 months, and 24 months of exposure in each of the above cases.

[Table] Urate

Claims (1)

[Claims] 1. A vinyl chloride resin composition containing at least one compound selected from the group of manganese acetate, cobalt acetate, and nickel acetate.