JPS5949940B2 - Polyamide resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite structure with a vinyl chloride resin using a polyamide resin composition that improves the heat resistance of the polyamide resin when in contact with the vinyl chloride resin.

It is known to add a heat stabilizer to polyamide resins in order to impart heat resistance to them. For example, halides such as copper iodide, potassium iodide, and potassium bromide; copper salts such as copper carbonate and copper sulfate; -(3,5 teriyabutyl 4-hydroxyhydrocinnamate)]methane, N, N'-
Phenolic group-containing organic compounds such as hexamethylenebis(3,5-di-tarsiabutyl-4-hydroxyhydrocinnamamide) are used as heat stabilizers. The heat resistance of polyamide resins to which these heat stabilizers have been added clearly increases in air, although this varies depending on the type. However, the present inventors have discovered that when polyamide resin to which a heat-resistant stabilizer has been added as described above comes into contact with a vinyl chloride resin, it has no heat resistance at all despite the addition of the heat-resistant stabilizer. I found it. Therefore, the inventors of the present invention have intensively investigated a method of imparting heat resistance to polyamide resin even when the polyamide resin is in contact with vinyl chloride resin. As a result, the inventors have added a phenolic heat resistance stabilizer and a phosphorus-containing compound to polyamide resin. The inventors have discovered that the heat resistance of polyamide resins can be significantly increased by doing so, leading to the present invention. In the present invention, polyamide resin means both aliphatic polyamide resin and aromatic polyamide resin, and examples of aliphatic polyamide resin include nylon 6, nylon 6.6, nylon 6.10, nylon 11, nylon 12, and nylon 6.・12, nylon 6/6/6 copolymer, nylon 6/12 copolymer, nylon 6/6/6/12 copolymer, etc., and aromatic polyamide resins include, for example, xylene diamine and dicarboxylic acid. Polymer of (trade name: SHOAMIDE◆500,
+600, +1800, etc.).

In general, polyamide resin is a monomer component consisting of lactam, amino acid, dicarboxylic acid, and diamine, and is a homopolymer composed of one type of these monomers or a copolymer composed of two or three of these monomers. but,
In the present invention, any of them may be used. As the phenolic heat stabilizer that can be used in the present invention, octadecyl 3
-(3',5' teriyabutyl 4' hydroxyphenyl)propionate, tetra-scratch [methylene-(
3,5 ditertyabutyl 4 hydroxyhydrocinnamate)] methane, N,N'-hexamethylene bis(3
, 5-ditertyabutyl 4-hydroxyhydrocinnamamide), ditertyabutyl-P-cresol, 2,
Examples include compounds commonly used as heat stabilizers for polyamide resins, such as 6-ditertyabutyl 4-alkylphenol.

In addition, phosphorus-containing compounds include phosphoric acid, trilauryl phosphite, phenyl diisodecyl phosphite, and tris(
Nonylphenyl) phosphite, diphenylisodecyl phosphite, triphenyl phosphite, and the like. According to the present invention, by blending 0.1 to 2.0 parts by weight of the above-described phenolic heat stabilizer and 0.05 to 2.0 parts by weight of the phosphorus-containing compound to 100 parts by weight of the polyamide resin. Significantly improves the heat resistance of polyamide resin in contact with vinyl chloride resin. It is possible to

Namely. The present invention provides a composite structure consisting of a vinyl chloride resin and a polyamide resin, which are closely related to each other. This is a composite structure characterized by using a compound containing 0.05 to 2.0 parts by weight of a compound/substance. Examples of structures in which the vinyl chloride resin and the polyamide resin are in contact include coated dragon heat wires and heat-sensitive elements used in heating elements such as electric blankets, electric carpets, and electric sheets. The coated heating wire is a heater wire coated with polyamide resin and further coated with vinyl chloride resin.

The heat-sensitive element is, for example, as shown in FIG. 1, and is composed of a core wire 1, a heater 2, a heat sensitive element 3, a signal conductor 4, and a jacket 5. When a vinyl chloride resin is used, the polyamide resin composition of the present invention is suitably used as the heat sensitive member 3. In these structures, the vinyl chloride resin and the polyamide resin are in direct contact with each other, so it is thought that the direct influence of the vinyl chloride resin accelerates the deterioration of the polyamide resin. As a result, sufficient heat resistance stability is imparted to the polyamide resin, and therefore, by using the polyamide resin composition of the present invention, a structure with excellent heat resistance can be obtained. Example 1 To 12,100 parts by weight of nylon, tetra-scratch [methylenebis(3,5 ditertiarybutyl 4-hydroxyhydrocinnamate)]methane (trade name RganOxlO) was added.
1 part by weight of lO) and 0.5 part by weight of trilauryl phosphite were thoroughly mixed in a mixer and then melt-mixed in a twin-screw extruder.

This mixture was molded into a JIS No. tampel piece using an injection molding machine, and the tampel piece was wrapped on both sides in a sandwich-like pattern with a polyvinyl chloride resin (product name: Polypin 2628, manufactured by Plasteta) with a thickness of 1 inch, and then heated in a gear oven at 120°C. A heating test was conducted inside. The test method is to keep the test piece at constant temperature and humidity (2
After standing for one day at 0° C., 6570 RH), strength and elongation were measured using Telesilon UTM-1 at a tensile rate of 50 mm/min. The tensile strength and elongation at break of the polyamide resin after heating for each time were measured, and both the strength and elongation hardly changed after 1000 hours. Comparative Example 1 IrganOxlOl was mixed using the same mixing method as in Example 1.
A composition was prepared in which only 1 part by weight of O was added to 12,100 parts by weight of nylon, test pieces were prepared in the same manner as in Example 1, and a heat deterioration test was conducted in the same manner as in Example 1.
There was almost no change up to 700 hours, but after 1000 hours, both the strength and elongation decreased rapidly, and the strength was about 40% and the elongation was about 10%.

Therefore, in the case of contact, there is a significant difference between the case of using only a phenol group-containing heat-resistant stabilizer and the case of using a mixed stabilizer of a phenol-containing heat-resistant stabilizer and a phosphorus compound. It is clear that this case is significantly more effective. Example 2 N,N'-hexamethylene bis(3,5-di-tarsiabutyl-4-
Hydroxyhydrocinnamamide) (trade name: Irga)
When 0.5 parts by weight of nOxlO98) and 0.5 parts by weight of phosphoric acid were mixed in the same manner as in Example 1 and a heat deterioration test was conducted in the same manner, chloride was observed in the same manner as in the composition of Example 1. The heat resistance in contact with vinyl resin was excellent.

Example 3 Aromatic polyamide resin (trade name SHOAMIDE゛50
0) 100 parts by weight of IrganOxlO98O. 5 parts by weight and 0.5 parts by weight of phenyl diisodecyl phosphite were mixed in the same manner as in Example 1, and the resulting composition was subjected to a heat deterioration test in the same manner as in Example 1. Excellent results were obtained.

Example 4 Using the polyamide resin composition of Example 1 or Comparative Example 1,
The heat-sensitive element shown in Figure 1 was made.

The heat-sensitive element had a core wire made of polyester fiber, a heater and signal wire made of copper, and an outer jacket made of vinyl chloride resin.

A heating deterioration test was conducted on this heat-sensitive element at 150° C., and the bending time for one bending was measured. As a result, the time required for the one prepared in Comparative Example 1 was 145 hours, whereas the time required for the present invention (Example 1) was 170 hours, which was excellent.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view illustrating a sensitive element as an example of a structure in which a vinyl chloride resin and a polyamide resin are in contact with each other. 3...Thermosensitive body, 5...Outer cover.

Claims (1)

[Scope of Claims] 1. In a composite structure consisting of a vinyl chloride resin and a polyamide resin, which are closely related to each other, as the polyamide resin, octadecyl 3 is added to 100 parts by weight of the polyamide resin.
-(3',5' di-tertiary butyl 4' hydroxyphenyl) propionate, tetrakis-[methylene-(
3'5 ditertyabutyl 4 hydroxyhydrocinnamate)] methane, N,N'-hexamethylene bis(3
, 5-diterthyabutyl-4-hydroxyhydrocinnamamide), ditertiarybutyl-P-cresol and 2
, 6-ditertyabutyl 4-alkylphenol 0.1-2.
0 parts by weight and 0.05 to 2 parts by weight of a phosphorus-containing compound selected from the group consisting of phosphoric acid, trilauryl phosphite, phenyl diisodecyl phosphite, tris(nonylphenyl) phosphite, diphenylisodecyl phosphite and triphenyl phosphite. A composite structure characterized by using a compound containing .0 parts by weight.