JPS6262858A - Polyamide resin composition - Google Patents

Abstract

PURPOSE:A polyamide resin composition having extremely reduced occurrence of molding burr and extremely improved heat-resistant temperature, having a basic composition obtained by blending a thermoplastic noncrystalline polyamide resin with a thremoplastic crystalline polyamide resin. CONSTITUTION:A thermoplastic noncrystaline polyamide resin (any resin of nylon 6, 66, 11, 12 or 510, preferably nylon 6) is blended with 10-80wt% high- molecular weight thermoplastic crystalline polyamide resin (any of nylon 6, 66, 11, 12 or 510 preferably nylon 66) and kneaded well by a blender.

Description

[Detailed description of the invention] [Industrial application field] The present invention has basic compositions of 6, 66, 12, 11, 5
The present invention relates to a thermoplastic polyamide resin composition comprising a thermoplastic amorphous polyamide resin such as 10 nylon and a thermoplastic crystalline polyamide resin.

[Summary of the invention]

The basic composition of the present invention is to add a thermoplastic crystalline polyamide resin to a thermoplastic amorphous polyamide resin, thereby greatly improving heat resistance and moldability.

[Conventional technology]

Conventionally, resin compositions whose basic composition is polyamide-based, for example, as shown in Japanese Patent Publication No. 55-45576, crystal accelerators such as molybdenum disulfide and graphite, and some lA, glass fibers are added to increase the heat resistance temperature. It's improving.

[Problems and objects to be solved by the invention] However, when the polyamide resin composition obtained in this way is used as a material for forming the bottom, it has the disadvantage that it causes the formation of flakes when forming the bottom, and it is difficult to perform secondary processes such as barrel processing. Next processing has to be carried out.

Therefore, the cost is very high and the quality cannot be stabilized.

In addition, amorphous polyamide resin is used to prevent molding from forming, but it has low heat resistance and cannot withstand heat treatment after α-forming, resulting in condyle points during deformation.

The present invention solves the above problems, and its purpose is to use v-h+ thermoplastic amorphous polyamide resin.
What is the nature of i-formity (α-form burr)? The present invention is characterized by providing a polyamide resin composition that improves heat resistance without degrading it.

[Means for solving problems]

The basic composition of the polyamide resin composition of the present invention is a thermoplastic crystalline polyamide resin with a polymer bonded to a thermoplastic amorphous resin. It is characterized by -80% Hl added in heavy enemy areas.

The amorphous polyamide resin used in the present invention may be any thermoplastic material, but nylon 6 is particularly desirable, and any crystalline polyamide resin may be used as long as it is thermoplastic. Nylon 66 is preferred.

In addition, the amount of crystalline polyamide resin added is 10% compared to the weight ratio.
If it is less than 80%, heat resistance will be poor and deformation will occur, and if it exceeds 80%, molding burrs will occur in large quantities, so the above range is desirable.

Although the basic composition is a polyamide resin composition and inorganic fillers such as glass fibers may be added, the present invention is not limited to a specific composition, as the same effect can be obtained no matter which composition is used. It's not something that works.

[Example-1] Amorphous nylon 6 resin 67% by weight and crystalline nylon 66 resin 33% by weight, which had been thoroughly dried at 80°C for 3 hours or more, were thoroughly mixed in a mixer, injection molded into a test piece, and machined. Physical properties]
Straight (tensile strength, bending strength IZ.

D impact filter) was measured.

In addition, we injection-molded a case for an exterior watch part and evaluated its α-shape (molding burr), and evaluated the heat resistance of the same molded case.
Table 1 shows the results of a heat resistance evaluation conducted at the temperature in the open for 2 hours.

It is clear from the first table <Implementation F! It can be seen that AJ-1 has a slightly lower strength than amorphous nylon 6 resin, but the occurrence of cracks (f) is almost unchanged and the heat resistance temperature is excellent in terms of toughness.

[Example-2] The following composition was evaluated by the method of Example-1, and the results are shown in Shigeru Hoji.

As shown in Table 2, Table 2, the mixing ratio f′i mechanical properties and 29
There is a relationship between the heat resistance temperature of the salmon and crystalline nylon 66.If the Ili ratio of crystalline nylon 66 exceeds 80% by weight, the mechanical properties will be impaired and at the same time the formation of flakes will increase. Both methods are undesirable because their heat resistance deteriorates due to concealment and they lack practicality.

Preferably, the residue is 10% to 80%.

〔Effect of the invention〕

As mentioned above, according to the present invention, since 10 to 80% by weight of flat viscosity thermoplastic crystalline polyamide resin is added to the thermoplastic amorphous polyamide resin, the occurrence of molding cracks is greatly reduced compared to the conventional method. The heat resistance temperature has also been greatly improved.

Further, there is no need for secondary processing for molding and ring forming, which has the effect of making it possible to significantly reduce costs.

The assembly can be widely applied in the field of electronic equipment, information@devices, and general molding fields.

that's all

Claims (3)

[Claims] (1) A polyamide resin composition whose basic composition is that a thermoplastic crystalline polyamide resin is added in a weight ratio of 10 to 80% to a thermoplastic amorphous polyamide resin. (2) The thermoplastic amorphous resin is 6, 66, 11, 12
510 nylon. (3) The thermoplastic crystal resin is 6, 66, 11, 12
510 nylon.