JPS5845977B2 - Chlorine-containing resin composition - Google Patents

Description

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

Conventionally, chlorine-containing resins such as polyvinyl chloride, polyvinylidene chloride, chlorinated polyethylene, vinyl chloride-vinylidene chloride copolymers, etc. are mainly decomposed and colored by heat, so it is necessary to add a stabilizer.

Therefore, as a stabilizer for chlorine-containing resins, calcium-based compounds can be considered as an alternative to lead-based stabilizers, but they can effectively prevent initial discoloration and have long-term thermal stability. At present, a material with excellent heat resistance stability has not been obtained to date.

In view of the above-mentioned facts, the present inventors conducted intensive studies to find a way to obtain a chlorine-containing resin that is non-toxic and has excellent heat resistance stability, and as a result, the present invention was completed.

The gist of the present invention is to combine a chlorine-containing resin with a magnesium diketone complex, a mercapto compound, and a chlorine-containing resin selected from lime silicates, lime aluminates, or lime titanates obtained by a calcination method. It consists in a chlorine-containing resin composition formed by adding one or more kinds of compounds.

The magnesium diketone complex used in the present invention has the general formula (where R1 includes, for example, parachlorophenyl group, phenyl group, methyl group, etc., and R2 includes, for example, parachlorophenyl group, phenyl group, methyl group, ethoxy group, etc.), for example,
Diparachlorophenylbenzoylmethane magnesium,
Parachlorobenzoyl/benzoylmethanemagnesium, valachlorbenzoylacetonemagnesium, dibenzoylmethanemagnesium, dibenzoylacetonemagnesium, acetylacetonemagnesium, ethylmagnesium acetoacetate, and the like.

Mercapto compounds used in the present invention include monovalent mercaptides such as propyl mercaptan, lauryl mercaptan, stearyl mercaptan thiophenol,
2-benzothiazole, thioglycerin, etc., divalent mercaptides, such as 1,2-dithioglycerin, 1,3-dithioglycerin, pentamethylene, hexamethylene, nonamethylene, octamethylene, dodecamethylene, dithiol, 1,2-dithioglycerin, etc. Examples include 3-stearylglycerin ester and polyvalent mercaptides such as trithioglycerin.

Examples of lime silicate, lime aluminate, or lime titanate obtained by the calcination method used in the present invention include dicalcium silicate, trilime silicate, +3:2 lime silicate, and aluminium silicate. Acid-lime, dicalcium aluminate, 1:2-lime aluminate, 6-aluminate lime, 12-nia-aluminate lime, titanate-lime, dilime titanate, trilime titanate, etc. with low activity. Things can be mentioned.

The present invention consists of three components: a magnesium diketone complex, a mercapto compound, and one or more compounds selected from lime silicates, lime aluminates, and lime titanates, each obtained by a calcination method. Because it is used in combination, the mutual effect not only promotes long-term thermal stability, but also significantly improves the effect of preventing initial coloration, which previously did not produce good results with non-toxic formulations. It is.

Regarding the amount of stabilizers added in the present invention, for 100 parts by weight of the chlorine-containing resin, 0.5 to 20 parts by weight of a magnesium diketone complex, 0.05 to 1 part by weight of a mercapto compound, and 0.05 to 1 part by weight of a mercapto compound, and 100 parts by weight of a chlorine-containing resin. 1 to 20 parts by weight of one or more compounds selected from acid limes, aluminate limes, and titanate limes are preferably used.

Incidentally, the amount of the stabilizer added in the present invention is not limited to the above range, and appropriate stabilizers, fillers, pigments, lubricants, etc. may be used as necessary.

The present invention will be explained below using examples.

In the examples shown below, polyvinyl chloride having an average degree of polymerization of 1100 was used.

Example 1 2 parts by weight of magnesium acetylacetone and 0.2 parts by weight of 2-benzothiazole per 100 parts by weight of polyvinyl chloride.
parts by weight, 2 parts by weight of dicalcium silicate, and 0.5 parts by weight of wax were mixed uniformly in a miller at 200°C.
The wires were continued to be mixed with a mixed wire roll, and the coloring property was observed, and heat resistance tests such as initial coloration prevention property and long-term thermal stability were conducted.

The results are shown in Table 1.

For comparison, similar test results when magnesium acetylacetone or 2-benzothiazole were used alone or in combination are also shown in Table 1 as Comparative Examples 1 to 3.

As is clear from Table 1, when the three stabilizers listed above are used together as in the present invention, due to the mutual effect,
Initial discoloration prevention property and long-term thermal stability are significantly improved, and even if the system contains a mercapto compound containing a nitrogen atom, the blackening phenomenon as in Comparative Example 2 or Comparative Example 3 does not occur. .

Example 2 For 100 parts by weight of polyvinyl chloride, 2 parts by weight of acetone magnesium, 1 part by weight of 1,8-octyl mercaptan, 2 parts by weight of dicalcium silicate, and 0.5 parts by weight of wax.
A heat resistance test was conducted in the same manner as in Example 1 using the blended powder containing the added parts by weight.

The results are shown in Table 2.

For comparison, the results of similar heat resistance tests using the formulations shown in Table 2 are also shown as Comparative Examples 4 to 10.

As is clear from Table 2, when three-component stabilizers were used together as in the present invention, the initial discoloration prevention property and long-term thermal stability were significantly improved due to the mutual effect. , and other systems such as Comparative Examples, all have poor heat resistance and are not practical.

Claims (1)

[Scope of Claims] 1. A chlorine-containing resin containing a magnesium diketone complex, a mercapto compound, and one selected from lime silicates, lime aluminates, or lime titanates obtained by a calcination method, respectively. A chlorine-containing resin composition obtained by adding two or more kinds of compounds. 2 The magnesium diketone complex has the general formula (in the formula R1
represents a parachlorophenyl group, a phenyl group, or a methyl group, and R2 represents a parachlorophenyl group, a phenyl group, a methyl group, or an ethoxy group.