JPS6224454B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a polyvinyl chloride resin composition, and its object is to provide a polyvinyl chloride resin composition that has excellent heat resistance, weather resistance, and initial coloring resistance. Chlorine-containing resins, such as polyvinyl chloride resin, have various problems such as significant discoloration and decomposition due to heat during processing, and deterioration with long-term use. It is customary to add various stabilizers to the product. Traditionally used lead-based stabilizers such as tribasic lead sulfate, tribasic lead maleate, and lead stearate, as well as stabilizers such as cadmium stearate, have excellent performance, but their toxicity is a problem. In recent years, various non-toxic or low-toxic stabilizers have been proposed to replace these, and have come into widespread use. Various compounds such as barium, calcium, magnesium, and zinc, as well as organic tin compounds, organic phosphorus compounds, and epoxy compounds are used as such stabilizers. Zinc compounds in particular have insufficient heat resistance, so they cannot be used with other stabilizers. It has become common practice to use stabilizer components in combination, and various combination formulations have been proposed, but all of them have advantages and disadvantages and are not fully satisfactory in practical terms. In view of the above-mentioned circumstances, the present invention was achieved through careful experimental research, and includes (a) one or more kinds selected from alkaline earth metal salts and zinc salts of organic acids as a stabilizer component; A polyvinyl chloride resin containing (b) a polyhydric alcohol, (c) one or more selected from the group consisting of magnesium oxide, magnesium hydroxide, magnesium silicate, and calcium silicate, and (d) a thiodipropionate compound. It is a composition that exhibits excellent heat resistance, weather resistance, and initial discoloration resistance. As the alkaline earth metal salt or zinc salt of an organic acid, the organic acid component may be 2-ethylhexoic acid, octylic acid, neoacid, lauric acid, stearic acid,
palmitic acid, isostearic acid, oleic acid,
Examples include thiols and keto acids such as ricinoleic acid, hydroxystearic acid, benzoic acid, phenol, cresol, nonylphenol, and mercaptoic acid, and basic salts thereof may also be used. Further, the alkaline earth metal is any one of magnesium, calcium, barium, and strontium. Its suitable blending amount is 0.1 to 100 parts of resin.
5 parts, and if the amount is less than this range, the initial coloring resistance will not be sufficient, and if it is more than this, not only will no further effect be obtained, but there is a risk that processability will be impaired. Ethylene glycol is a polyhydric alcohol,
diethylene glycol, propylene glycol,
Examples include glycerin, pentaerythritol, dipentaerythritol, mannitol, sorbitol, pentaerythritol stearate, trimethylolpropane, neopentyl alcohol, etc., and the preferred amount thereof is 0.1 to 5 parts per 100 parts of resin. If the amount is less than these ranges, the heat resistance will not be sufficient, and if the amount is more than this, the initial coloring resistance may be impaired. Thiodipropionic acid ester compounds include mono- and dilaurylthiodipropionate, 2-ethylhexylthiodipropionate, diisodecylthiodipropionate, diester of mixed coconut oil alcohol and thiodipropionic acid, diethylene glycol and thiodipropionic acid, polyester of pentaerythritol and thiodipropionic acid, magnesium stearyl thiodipropionate, calcium lauryl thiodipropionate, etc., and the preferred blending amount is in the range of 0.01 to 3 parts per 100 parts of resin. It is.
If the amount is less than these ranges, the heat resistance will not be sufficient, and if the amount is more than this, the effect will not be improved. Magnesium oxide, magnesium hydroxide, magnesium carbonate, and calcium silicate, which are the components (c), are generally commercially available products and are preferably blended in an amount of 0.1 to 5 parts per 100 parts of resin. or,
If the number is less than the above, it is difficult to obtain sufficient effects on heat resistance and weather resistance, and if it is more than the above, there is a risk that initial coloring resistance may be impaired. According to research conducted by the present inventors, it is difficult to obtain good performance in such a combination with inorganic salts other than these four types, and there is clearly a significant difference in heat resistance and weather resistance in particular. In the present invention, in addition to the above, other stabilizer components, plasticizers, blowing agents,
Various additives such as antistatic agents, flame retardants, surfactants, colorants, mold release agents, viscosity modifiers, fungicides, ultraviolet absorbers, and fillers can be blended. The stabilizer component and other additives may be added to the resin separately as they are, or may be added in the form of a mixed one-pack or in the form of a composite granule that is granulated and integrated. Below, performance test results for various formulations of the composition of the present invention are shown together with reference examples. Example 1 Calcium stearate 0.2 parts, zinc stearate 1.0 parts per 100 parts by weight of polyvinyl chloride resin
1 part, pentaerythritol 1.0 part, thiodipropionate dilauryl ester 0.1 part, polyethylene wax 1.0 part, titanium oxide 0.5 part, and the inorganic compounds shown in Table 1 were added and kneaded for 5 minutes at a roll temperature of 170°C to form a 0.2 mm A thick sheet was produced. The sheet was then exposed to a gear oven at 180°C to test its heat resistance. The sheet was also exposed in a sunshine weather meter at 40° C. for 120 minutes for 537 hours to test its weather resistance.

[Table] Example 2 Calcium stearate 0.2 parts, zinc stearate 1.0 parts per 100 parts by weight of polyvinyl chloride resin
A sheet was prepared in the same manner as in Example 1 by adding 1.0 part of pentaerythritol, 1.0 part of magnesium carbonate, and 0.1 part of the organic compound shown in Table 2, and the heat resistance was tested.

[Table] Example 3 50 parts of dioctyl phthalate and calcium stearate to 100 parts by weight of polyvinyl chloride resin
0.3 part, zinc stearate 0.7 part, dipentaerythritol 0.7 part, thiodipropionic acid dilauryl ester 0.1 part, and inorganic compounds shown in Table 3 0.8 part
A sheet was prepared in the same manner as in Example 1, and its heat resistance was tested.The sheet was pressed at 170°C for 5 minutes to evaluate its initial coloring resistance.

【table】

Claims (1)

[Claims] 1. As a stabilizer component, (a) one or more selected from alkaline earth metal salts and zinc salts of organic acids, (b) polyhydric alcohols, (c) magnesium oxide, magnesium hydroxide, magnesium carbonate, and calcium silicate. A polyvinyl chloride resin composition containing one or more selected from the group consisting of (d) a thiodipropionic acid ester compound;