JPS5946269B2 - Chlorine-containing resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chlorine-containing resin composition that is non-toxic and has excellent heat-resistant stability.

Chlorine-containing resins are inherently thermally unstable, and when heated during molding, they decompose and release hydrogen chloride, causing the resin to become colored. Molding is done by adding a heat stabilizer to the resin.

However, conventionally used heat stabilizers for chlorine-containing resins contain heavy metals such as lead, and are regulated from the standpoint of pollution and the environment.

In addition, there are non-toxic stabilizers containing nitrogen atoms such as β-aminocrotonic acid ester and α-phenylindole, but these stabilizers react with hydrogen chloride if it is generated in a chlorine-containing resin. This forms a quaternary ammonium salt, which accelerates the decomposition of the resin and causes a burning phenomenon, resulting in blackening. For this reason, although the stabilizer is non-toxic, it has rarely been used as a heat stabilizer. In view of the above-mentioned facts, the present invention has been made through various studies to provide a thermally stable and non-toxic chlorine-containing resin composition that does not cause burning phenomena, etc., and as a result, it has been developed to provide a specific heat stabilizer containing a nitrogen atom. This was made based on the discovery that the burning phenomenon does not occur when these compounds are used together. That is, the gist of the present invention is to prepare a chlorine-containing resin with a nitrogen atom-containing heat stabilizer A, an alkali metal or alkaline earth metal chloride, oxide or hydroxide, and a boron or aluminum oxide or hydroxide. one or more compounds B selected from the group consisting of one or more compounds B selected from the group consisting of lime silicates, lime aluminates, and lime titanates obtained by a calcination method The present invention relates to a chlorine-containing resin composition to which C is added.

The chlorine-containing resin used in the present invention is a resin containing chlorine in its molecule, and is mainly composed of, for example, polyvinyl chloride, polyvinylidene chloride, vinyl chloride-vinylidene chloride copolymer, vinyl chloride, or vinylidene chloride. Examples include copolymers of ethylene, pinyl acetate, methyl acrylate, acrylonitrile, etc., chlorinated polyvinyl chloride, chlorinated polyethylene, and the like.

The nitrogen atom-containing thermal stabilizer A used in the present invention is a stabilizer used as a thermal stabilizer for chlorine-containing resins and includes all nitrogen atom-containing stabilizers,
For example, β-aminocrotonic acid and butanediol, 1.2
- Dipropylene glycol, thiodiethylene glycol, esters with linear saturated alcohols, α-phenylindole, hexamethylene diamine, stearamide, palmitic acid amide, methylene bisstearic acid amide, 2-benzothiazole, etc., among others. Bis(β-aminocrotonic acid)butanediol and 2benzothiazole are preferably used.

The amount of the stabilizer used is not limited in any way, but is 0.05 to 5 parts by weight per 100 parts by weight of the chlorine-containing resin.
It is preferably used within the range of parts by weight.

The chlorides, oxides, or hydroxides of alkali metals or alkaline earth metals and the oxides or hydroxides of boron or aluminum used as compound B in the present invention include:
For example, magnesium chloride, calcium chloride, zinc chloride,
Barium chloride, sodium chloride, potassium chloride, lithium chloride, magnesium oxide, zinc oxide, pallium oxide,
Examples include calcium oxide, magnesium hydroxide, calcium hydroxide, barium hydroxide, aluminum oxide, aluminum hydroxide, boric acid, borax, etc. These compounds may be used alone, or two or more compounds may be mixed. may also be used. The amount of the compound added is not limited in any way in the present invention, but for example, the amount of the compound added is calculated by multiplying the number of moles of the nitrogen atom-containing heat stabilizer by the number of nitrogen atoms contained in the heat stabilizer. 0.5 for the value
It is preferably used in a range of 10 molar equivalents. Next, the lime silicate, lime aluminate, and lime titanate obtained by the calcination method used as compound C in the present invention are as follows:
For example, lime silicate, dilime silicate, obtained by calcination method,
Trilime silicate, 3:2 lime monosilicate, lime aluminate, dilime aluminate, trilime aluminate, 1:2 lime aluminate, 1:6 lime aluminate, 12: JA lime aluminate,
Examples include lime titanate, and these compounds may be used alone or in combination of two or more compounds.

The amount of the compound to be used is not limited in any way, but it is preferably used in the range of 0.5 to 20 parts by weight based on 100 parts by weight of the chlorine-containing resin from the physical properties such as moldability of the chlorine-containing resin composition. be done.

In the present invention, the nitrogen-containing heat stabilizer A for the resin, the compound B, and the compound C are added to the chlorine-containing resin to form a chlorine-containing resin composition. , in order to improve the moldability etc. of the composition,
;Stabilizers, fillers, etc. that are generally added to chlorine-containing resins;
Pigments, lubricants, etc. may be added as appropriate and necessary. Since the chlorine-containing resin composition of the present invention has the above-mentioned structure, the composition is non-toxic, and the burning phenomenon is suppressed by adding the compounds B and C, so that there is no initial discoloration. It has excellent heat resistance stability.
Next, the present invention will be explained by examples.

Note that the term "parts" below means parts by weight. Example 1 A blend of the above composition was mixed and fed to a kneading roll for 20 minutes.
Knead at 0'C to make a sheet, then knead for 3 minutes, 5 minutes, 10 minutes,
Discoloration of the sheet was observed after 15 and 20 minutes.

As a result, it was found that it was white and did not change color for up to 5 minutes, turned slightly yellow after 10 minutes, and turned yellow after 15 to 20 minutes, indicating that it had very good thermal stability. The results are shown in Table 1.

Examples 2 to 6, Comparative Examples 1 to 5 As in Example 1, 2-benzothiazole, magnesium hydroxide, calcium hydroxide, dicalcium silicate, etc. were used as stabilizers in the composition shown in Table 1. The mixture was kneaded in the same manner and the discoloration of the sheet was observed.

The results are shown in Table 1. It can be seen that Examples 1 to 6 have clearly improved thermal stability compared to Comparative Examples 1 to 5.

Claims (1)

[Claims] 1. A chlorine-containing resin, a nitrogen atom-containing heat stabilizer A, an alkali metal or alkaline earth metal chloride, oxide, or hydroxide, and a boron or aluminum oxide or hydroxide. one or more compounds B selected from the group consisting of compounds B; and one or more compounds selected from the group consisting of lime silicates, lime aluminates, and lime titanates obtained by a calcination method. A chlorine-containing resin composition to which Compound C is added. 2. The chlorine-containing resin composition according to claim 1, wherein the heat stabilizer A is bis(β-aminocrotonic acid) butanediol. 3. The chlorine-containing resin composition according to claim 1, wherein the heat stabilizer A is 2-benzothiazole. 4. Chlorine according to claim 1, wherein compound B is added in an amount of 0.5 to 10 molar equivalents to the value obtained by multiplying the number of moles of heat stabilizer A by the number of nitrogen atoms contained in the heat stabilizer. Containing resin composition.