JPS62240357A - Resin composition - Google Patents

Abstract

PURPOSE:To obtain a composition having improved low-temperature impact resistance and hygroscopicity without lowering the rigidity, by compounding a polyamide resin with a polyoctenylene resin, a terminal-hydrogenated polysiloxane and a catalyst for hydrosilylation reaction. CONSTITUTION:(A) 100pts.(wt.) of a polyamide resin containing 8-17 amide groups per 100 carbon atoms is compounded with (B) 1-100pts. of a polyoctenylene resin having a molecular weight of >=10,000, a trans-content of >=50%, preferably >=60%, a crystallinity of preferably >=10%, a melting point of >=40 deg.C, preferably 50-60 deg.C and a glass transition point of preferably -75--30 deg.C, (C) 0.1-50pts. of a polysiloxane having a molecular weight of 100-60,000 and hydrogenated at one or both molecular terminals and (D) preferably 0.001-1pt. of a hydrosilylation reaction catalyst such as chloride, acetate, octylate, etc., of platinum, iron tin or zinc.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a resin composition that has excellent low-temperature impact resistance and low hygroscopicity.

(Prior Art J3 and Problems) Polyamide resins are widely used as engineering plastics due to their excellent physical properties. but,
It is well known that it has drawbacks such as low low-temperature impact resistance, significant changes in physical properties due to moisture absorption, and poor dimensional stability.

As a method for improving impact resistance, for example, US Pat.
As proposed in 174,358 and Japanese Patent Publication No. 55-44108, it is preferable to blend modified α-olefin polymers such as ethylene/α-olefin copolymers grafted with α, β-unsaturated carboxylic acids. It is done. but,
The composition thus obtained suffers from the disadvantage that its rigidity is rapidly reduced and its heat resistance and weather resistance are also poor.

In addition, for methods of improving the water absorption of polyamide resin, please contact us! [A method of lowering the amide base concentration by combining (e.g., JP-A-57-24808) and a method of substituting the hydrogen bonded to the nitrogen of the amide group with an alkyl group (e.g., JP-A-57-24808)
-115488) is known. However, the compositions obtained in this manner have the drawbacks of poor dimensional stability and cold-foaming due to decreased solidity.

Therefore, the present inventors have worked diligently to develop a resin composition that has improved low-temperature resistance (1'J"J) and hygroscopicity, does not reduce rigidity, and has excellent weather resistance, heat resistance, and dimensional stability. As a result of research, we have arrived at the present invention.

(Means for Solving the Problems) That is, the present invention comprises a polyamide resin 100 hanging part, a polyoctenylene resin 1-100 hanging part, a terminal hydrogenated polysiloxane 0.1-501ff 1 part, and a hydrosilylation reaction catalyst 0. This is a resin composition containing .001 to 1 part R.

The polyamide resin used in the present invention is produced by a method of condensing an organic dicarboxylic acid and an organic diamine in equimolar amounts, a method of self-condensing a lactam, a method of self-condensing an aminocarboxylic acid, etc. It is suitable that the number of amide groups per 100 is 8 or more and 17 or less.

Typical dicarboxylic acids used to make polyamide resins include adipic acid, pimelic acid, superric acid, sebacic acid, dodecandioic acid, and the like. On the other hand, typical diamines include hexamethylene diamine and octamethylene diamine. Typical lactams include caprolactam and laurinlactam, and typical aminocarboxylic acids include aminoundecanoic acid and aminododecanoic acid. Examples of polyamides manufactured from these include nylon 6, nylon 66, nylon 69, nylon 6101, nylon 6
12, nylon 11, nylon 12, etc. Also,
During the polymerization of the polyamide resin used here, at least 2
It is also possible to use copolymerized nylons made by using various diamines or dicarboxylic acids, or mixtures of lactams, aminocarboxylic acids, etc. It is also possible to use blends of polyamide resins, such as mixtures of nylon 12 and nylon 6.

The polyoctenylene resin used in the present invention must be made by polymerizing cyclooctene, have one double bond per eight carbon atoms, and have a molecule m of 10,000 or more.
Further, it is preferable that the trans content is 50% or more, preferably 60% or more, and the crystallinity is 10% or more.

Further, this polyoctenylene resin has a melting point of 40°C or higher, preferably in the range of 50°C to 60°C, and a glass transition point of preferably in the range of -75°C to -30°C. Various methods can be adopted to synthesize cyclooctene, which is the base material constituting this polyoctenylene resin, but for example, after converting butadiene to dimer, one of the two remaining double bonds is hydrogenated. It is obtained by

The terminally hydrogenated polysiloxane used in the present invention must have a molecular weight in the range of 100 to 60,000, and it is also possible to use one in which both ends are hydrogenated, or one in which only one end is hydrogenated. In addition, some of the polysilokinane chains may have hydrogenated groups.

In addition, platinum, iron,
Examples include chlorides, acetates, and octylates of tin and zinc.

In addition, the addition period of polyoctenylene resin in the present invention is 1 to 1 to 100 parts by weight of polyamide resin lit.
It is necessary that the amount is in the range of 100 parts by weight, and if it is less than 1 part by weight (6) parts, no effect of improving low-temperature impact resistance will be observed. Moreover, if it exceeds 100 fRtt, the inherent chemical stability of the polyamide resin decreases, and at the same time, the melt fluidity decreases, resulting in poor workability.

In addition, in the present invention, the addition period of the terminally hydrogenated polysiloxane is 0.1% per 100 weight parts of the polyamide resin.
It is necessary for the amount to be in the range of ~50 parts by weight, and if it is less than 0.1 parts by weight, no improvement in hygroscopicity will be observed, and if it is more than 50 parts by weight, the original chemical stability of the polyamide resin will decrease. At the same time, melt fluidity also decreases, resulting in poor workability.

Further, the amount a of the hydrosilylation reaction catalyst added in the present invention is preferably 0.001 to 1 part. This catalyst is added to stabilize the blend structure, since the polyoctenylene resin and the terminally hydrogenated polysiloxane undergo a hydrosilylation reaction during melt mixing or molding. 0.001
Below the fam portion, this hydrosilylation reaction will not occur sufficiently and its improvement effect will be reduced. Moreover, if it is more than 1 part by weight, the reaction proceeds too much, resulting in poor moldability; problems such as shrinkage and gelation occur.

The resin composition of the present invention contains an antioxidant, if necessary, in the polyamide resin, polyoctenylene resin, terminal hydrogenated polysiloxane, and hydrosilylation reaction catalyst.
It is also possible to blend ultraviolet absorbers, heat stabilizers, nucleating agents, plasticizers, antistatic agents, flame retardants, inorganic fillers, etc.

The compositions of the present invention are prepared by mixing molten Fa in various ways. For example, a polyamide resin having a high melting temperature may be melted and the remaining polyoctenylene resin, terminal hydrogenated polysiloxane and hydrosilylation catalyst may be mixed therein, or the four components may be mixed at the same time. Moreover, the above-mentioned additives can be added at any of these stages as necessary.

The resin composition of the present invention is molded into a ladder shape by a conventionally known scale melt molding method. Examples include methods such as injection molding, extrusion molding, compression molding, and foam molding, which are used for a wide range of purposes.

(Example) Next, the present invention will be specifically explained using examples.

In addition, Izotsu VM impact strength is 85T) 4 D-570
The experiments were conducted at temperatures of -40°C, ~20°C, and 23°C in accordance with the above.

In addition, the water absorption rate was determined after immersing the molded sample in water at 80°C for one week.
I used a nu POnt type water discharge water meter.

Examples 1 to 8 Nylon 12 (Diamid L19 manufactured by Daicel Hikorus)
0'1) polyoctenylene resin (
Huls VESTENAHER 8012) and terminally hydrogenated polysiloxane (Petrarch'I! JPS 5
42) was added to the amount shown in Table 1, and at the same time, chloroplatinic acid was added in an amount of 0.1% based on the terminally hydrogenated polysiloxane, and the mixture was melted and kneaded in a mine extruder and then pelletized. Using this pellet, an Izot test piece was molded using a conventional injection molding machine.

Table 1 shows the results of the Izot test and water absorption measurement conducted on this test piece.

Examples 9 to 11 In Examples 1 to 8, three types of nylon shown in Table 1 (nylon 6, Unibuca A) were used instead of nylon 12.
1030BRF, Nylon 66 Niboli Plastics 1000-2, Nylon 11: Toshi B [ESNOTL
) Izot test pieces were molded in exactly the same manner as in Examples 1 to 8, except for using the following. Table 1 shows the results of the Izot test and water absorption measurement conducted on this test piece.

Example 12 In Example 2, P as the terminal hydrogenated polysiloxane
An Izod test piece was molded in exactly the same manner as in Example 2, except that PS537 manufactured by etrarCh was used instead of PS542. The Izot test results and water absorption measurement results conducted on this test piece are shown in Table 1. Comparative Examples 1 to 4 In Examples 2 and 9.10.11, terminal hydrogenated polysiloxane and chloroplatinic acid were not added. Except for this, Izot test pieces were molded in exactly the same manner as in Example 2 and 9.10.11. Table 1 shows the results of the Izot test and water absorption measurement conducted on this test piece.

Comparative Examples 5-8 Izot test pieces were molded in exactly the same manner as in Examples 2 and 9.10.11, except that the polyoctenylene resin and the terminally hydrogenated polysiloxane were not added. . Table 1 shows the results of the Izot test and water absorption measurement conducted on this test piece.

Claims (1)

[Claims] 1 part polyoctenylene resin to 100 parts by weight polyamide resin
~100 parts by weight, terminally hydrogenated polysiloxane 0.1-5
A resin composition containing 0 parts by weight and a hydrosilylation reaction catalyst.