JPS6234259B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is a soft vinyl chloride resin that has excellent cold resistance, thermal stability, heat aging resistance, non-migration of plasticizer to other resins, plasticizer retention or perspiration, flame retardancy, weather resistance, etc. It is intended to provide a composition. The present invention also relates to a vinyl chloride resin composition containing a predetermined amount of an inorganic zinc compound and a predetermined amount of an epoxy fatty acid ester plasticizer. Epoxy fatty acid ester plasticizers traditionally added to vinyl chloride resins have a function as a heat stabilizer and have excellent cold resistance, heat aging resistance, non-migration to other resins, oil resistance, weather resistance, etc. It is widely valued for this reason. However, the major drawback is that it has poor retention properties and causes perspiration, so it cannot be added in large quantities, and it is usually made of vinyl chloride resin.
It is only used in an amount of about 5 to 10 parts by weight per 100 parts by weight. On the other hand, it is widely known that inorganic zinc compounds are added to vinyl chloride resins as pigments, heat stabilizers, foaming agents, smoke suppressants, and the like. However, a characteristic of zinc-containing compounds, whether organic or inorganic, is that when added in extremely small amounts (usually about 2 parts by weight or less per 100 parts by weight of vinyl chloride resin), they act as heat stabilizers. When added in an amount exceeding a certain amount, zinc chloride formed by reacting with chlorine released from the vinyl chloride resin promotes thermal decomposition of the vinyl chloride resin and rapidly accelerates the decomposition. So-called Zinc
It is widely known to cause burning. For this reason, it has been considered that adding a large amount of inorganic zinc compounds to vinyl chloride resin is extremely dangerous from the standpoint of thermal stability, processability, etc. However, the novel composition invented by the present inventors includes: (a) 100 parts by weight of vinyl chloride resin (b) 10 to 100 parts by weight of inorganic zinc compound (c) Epoxy fatty acid ester plasticizer
A vinyl chloride resin composition containing 30 to 100 parts by weight. Here, as the vinyl chloride resin, in addition to the usual vinyl chloride homopolymer, all or part of it may be replaced with a copolymer resin etc. mainly composed of vinyl chloride to the extent that the characteristics of the vinyl chloride resin are not impaired. can. Examples of such copolymer resins mainly composed of vinyl chloride include ethylene and
Vinyl chloride copolymer, propylene, vinyl chloride copolymer, vinyl acetate, vinyl chloride copolymer, ethylene/vinyl acetate/vinyl chloride graft copolymer, acrylic acid/vinyl chloride copolymer, acrylic acid ester/vinyl chloride Copolymer, vinylidene chloride/vinyl chloride copolymer, chlorinated polyethylene/
Examples include vinyl chloride copolymers and post-chlorinated vinyl chloride resins. Examples of inorganic zinc compounds include metal zinc powder, zinc oxide, zinc carbonate, zinc hydroxide, and zinc sulfide. Epoxy fatty acid ester plasticizers include epoxidized triglycerides made by epoxidizing fats and oils such as epoxidized soybean oil, epoxidized linseed oil, epoxidized safflower oil, epoxidized cottonseed oil, and epoxidized tall oil, and butyl epoxy stearate. , epoxy fatty acid monoesters such as octyl epoxy stearate, methyl epoxy stearate, glycidyl epoxy stearate, glycidyl oleate, and epoxy stearyl acetate, and epoxy fatty acid diesters such as propylene glycol dioleate. Now, when we look at the composition of the present invention, we see that it contains a large amount of epoxy fatty acid ester plasticizer, which has been considered taboo in the past, and also contains a large amount of inorganic zinc compound, which was previously unthinkable. It goes without saying that this is a completely new composition. Moreover, the composition of the present invention suffers from conventional problems such as poor thermal stability and processability due to the addition of a large amount of inorganic zinc compound, and sweating properties due to the addition of a large amount of epoxy fatty acid ester plasticizer, as described in the following examples. This is a composition that has successfully improved the drawbacks that would naturally be expected from textiles. Next, an example will be described. Example 1 For the composition shown in Table 1, a 6 inch diameter 2
Create a roll sheet with books and rolls, and then 1
The results of measuring various performances after press working to a thickness of m/m are shown.

【table】

[Table] As shown in the above examples, the composition of the present invention is found to be a material that is excellent in cold resistance, heat stability, non-migration to styrene, and perspiration. Among them, it is thought to some extent that thermal stability is improved when a large amount of epoxy fatty acid ester plasticizer is added at the same time as an inorganic compound of zinc, but at the same time, the sweating properties of epoxy plasticizers are improved. The complete suppression of this is a completely unexpected effect. As for the reason,
Although it has not been fully elucidated, it is thought that a phenomenon occurs when the reaction from the epoxy group to the incompatible epichlorohydrin compound is suppressed. It goes without saying that, in addition to the substances listed in the claims, various commonly used additives can be added to the composition of the present invention within a range that does not impair its properties. These include heat stabilizers, lubricants, processing aids, pigments, anti-aging agents, other compatible resins, flame retardants, blowing agents, fillers, extenders, etc. Next, the composition of the present invention can be used in various applications where general soft vinyl chloride resins are used, but among them, it can be used for hoses, tubes, etc. used outdoors due to its excellent weather resistance. It is used for medical tubes, bags, etc. because it provides compositions with excellent hygiene, such as wire mesh coatings, and for electrical wire coatings because it has excellent non-migration and heat aging properties.It is also used as flame retardants such as antimony oxide. There are various uses such as flame-retardant wire coating when used in combination. Examples of the wire coating material will be described below. Example 2 Two types of electric wires were created using the compositions shown in Table 2. First, using the composition of Process No. 12, UL
(Under writers Laboratorie's) stipulated in the standards.
An SPT-2 cord (structure: 0.16 m/m conductor, 42 strands, average coating thickness 1.3 m/m) was created. In addition, inner shield polyethylene electric wire specified in UL standard using Process No. 13, UL Style No. 1107
It was created. The structure has a single core conductor of 0.42 m/m, a polyethylene insulation layer thickness of 0.44 m/m, and an outer diameter of 1.3 m/m.
m, shield layer outer diameter 2.0m/m, vinyl sheath layer thickness 0.45m/m,

【table】

【table】 Table 3 shows the performance of the sheath layer of those wires.

【table】

[Table] In addition, these wires passed the VW-1 test, which is a flammability test specified by UL. As described above, the composition of the present invention is a wire coating material that is excellent in non-migration of heat-aged styrene and flame retardant properties.

Claims (1)

[Scope of Claims] 1. A vinyl chloride resin characterized by containing (a) 100 parts by weight of a vinyl chloride resin, (b) 10 to 100 parts by weight of an inorganic zinc compound, and (c) 30 to 100 parts by weight of an epoxy fatty acid ester plasticizer. Composition.