JPS62205145A - Resin composition - Google Patents

Abstract

PURPOSE:A resin composition having improved mechanical characteristics and low water absorption properties, obtained by blending a polyamide resin with specific amounts of a polyolefin resin and a polyoctenylene. CONSTITUTION:(A) 100pts.wt. polyamide resin (e.g. nylon 6, etc.) having 8-17 amide groups based on 100 carbon atoms is blended with (B) 1-200pts.wt. polyolefin resin (e.g. polypropylene, etc.) and (C) 1-100pts.wt. polyoctenylene resin which has one double bond based on 8 carbon atoms, >=10,000mol.wt., preferably >=50% trans form content and >=10% crystallinity.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a resin composition that has excellent mechanical properties and low water absorption.

(Prior Art and Problems) Polyamide resins are widely used as engineering plastics due to their excellent physical properties. but,
It is well known that properties such as low-temperature impact resistance and water resistance are inferior.

On the other hand, polyolefin resins are widely used because they are hydrophobic, chemically stable, have good electrical insulation properties, are safe even when incinerated, and can be recycled. Furthermore, nowadays there is a growing desire to use this polyolefin resin in various environments, but there is a problem particularly in impact strength at low temperatures.

Therefore, the present inventors have worked diligently to improve the water resistance and low-temperature impact resistance of polyamide resins and the low-temperature impact resistance of polyolefin resins, and at the same time to develop resin compositions that have both the excellent properties of both resins. As a result of research, we have arrived at the present invention.

(Means for Solving the Problems) That is, the present invention is a resin composition comprising 100 parts by weight of a polyamide resin, 1 part by weight of a polyolefin resin and 1 part by weight of a polyoctenylene resin.

The polyamide resin used in the present invention can be produced by a method of equimolar suspension condensation of an organic dicarboxylic acid and an organic diamine, a method of self-condensation of a lactam, a method of self-condensation of an aminocarboxylic acid, etc. , the number of amide groups per 100 carbon atoms is 8 or more17
A number less than or equal to one is appropriate.

Typical dicarboxylic acids used to make polyamide resins include adipic acid, pimelic acid, superric acid, sebacic acid, docanniic acid, and the like. On the other hand, typical diamines include hexamethylene diamine, octamethylene diamine, and the like. Furthermore, typical lactams include caprolactam and laurinlactam, and typical examples of aminocarboxylic acids include aminoundecanoic acid and aminododecanoic acid. Examples of polyamides made from these materials include nylon 6,
Examples include nylon 66, nylon 69, nylon 610, nylon 612, nylon 11, and nylon 12. Furthermore, copolymerized nylon obtained by using a mixture of at least two types of diamines or dicarboxylic acids, or lactams, aminocarboxylic acids, etc. during polymerization of the polyamide resin used here can also be used. It is also possible to use blends of polyamides, such as mixtures of nylon 12 and nylon 6.

The polyolefin resin used in the present invention is obtained by polymerizing olefin monomers under an organometallic catalyst, and a typical example is polypropylene (PP).
, high-density polyethylene (HDPE) with linear molecules, low-density polyethylene (LDPE) with a branched structure, low-density polyethylene (LLDPE) with linear molecules, and ultra-high-polymer polyethylene (UHMWPE). Further, in this polyolefin resin, it is also possible to use a blend of at least two types of polymers or a copolymer obtained by mixing at least two or more types of olefin monomers during polymerization.

The polyoctenylene resin used in the present invention is made by polymerizing cyclooctene, has one double bond per eight carbon atoms, and must have a molecular weight of 10,000 or more, and must have a trans content. It is preferable that the crystallinity is 50% or more, preferably 60% or more, and the crystallinity is 10% or more. In addition, this polyoctenylene resin has a melting point of 40°C or higher,
Preferably, the temperature is in the range of 50°C to 60°C, and the glass transition point is 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. For example, after forming butadiene into two sets, one of the remaining two double bonds is removed by hydrogenation. It can be obtained by doing.

In the resin composition of the present invention, the amount of polyolefin resin added to 100 parts by weight of polyamide is 1 to 20 parts by weight.
It is necessary that the amount is in the range of 0 parts by weight, and if it is less than 1 part by weight, no improvement in the water resistance of the polyamide resin will be observed.

Moreover, if it exceeds 200 parts by weight, compatibility with polyamide is poor and workability is also reduced.

In addition, the addition m of polyoctenylene resin in the present invention is 1 to 100 m per 100 parts of polyamide resin.
If the amount is less than 1 part by weight, no effect of improving low-temperature impact resistance will be observed. Moreover, if it exceeds 100 parts by weight, the inherent chemical stability of the polyamide resin or polyolefin resin will decrease, and at the same time, the melt fluidity will also decrease, resulting in poor workability.

In addition to the polyamide resin, polyolefin resin, and polyoctenylene resin, the resin composition of the present invention may optionally contain an antioxidant, an ultraviolet absorber, a heat stabilizer, a nucleating agent,
It is also possible to blend plasticizers, antistatic agents, flame retardants, inorganic fillers, etc.

The resin composition of the present invention can be produced by melt lamination using various methods. For example, a polyamide resin having a high melting temperature may be melted and the remaining polyolefin resin and polyoctenylene resin may be mixed therein, or the three components may be mixed at the same time. Moreover, the above-mentioned additives, such as a heat-resistant stabilizer, can also be added at any of these stages, if necessary.

The resin composition of the present invention can be molded into various shapes by various conventionally known melt molding methods. For example, injection molding
Methods include extrusion molding, compression molding, and foam molding.
Used for a wide range of purposes.

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

The Izot impact strength was measured at temperatures of -40°C, -20°C, and 23°C in accordance with ASTM 0570.

Further, the water absorption rate was measured using a DuPont type moisture meter after immersing the molded sample in water at 80° C. for one week.

Examples 1 to 3 Nylon 12 (Diamide L190 manufactured by Daicel Huls)
1) For 1001 parts of ffi, add volepropylene (UBE Polypro J 901 H) and Cudenylene resin (he I slJVEsTENAMER).
8012) was added in the same amount as shown in Table 1, and the mixture was melted and mixed using an ordinary extruder, and then pelletized.

Using this pellet, Izot test pieces were molded using a conventional injection molding machine. Table 1 shows the results of the Izot impact test and water absorption measurement conducted on this test piece.

Examples 4 to 6 Izot test was carried out in exactly the same manner as in Examples 1 to 3, except that polyethylene (Sumiyokusen G301 manufactured by Sumitomo Chemical Co., Ltd.) was added only at the times shown in Table 1 instead of polypropylene in Examples 1 to 3. The result was shaped. .

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

Examples 7 to 9 In Example 5, three types of nylon shown in Table 1 (Nylon 6 A103 made by Ninitika) were used instead of Nylon 12.
0BRF, Nylon 66 Niboli Plastic 1000
Izot test pieces were molded in exactly the same manner as in Example 5, except that Nylon 11 (BESNOTL manufactured by Toshi Co., Ltd.) was used. Table 1 shows the results of the Izot test and water absorption rate conducted on this test piece.

Example 10 In Example 5, polyamide elastomer (Diamide PAE manufactured by Daicel Huels) was used instead of nylon 12.
Izod test pieces were molded in exactly the same manner as in Example 5, except that E62) was used. Table 1 shows the results of the Izotsu ff test and water absorption measurement conducted on this test piece.
Shown below.

Comparative Example 1.2 Izot test pieces were molded in exactly the same manner as in Example 2, except that the addition m of polyoctenylene resin was as shown in Table 1.

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

Comparative Example 3 In Example 4, the addition m of polyoctenylene resin was 1
Izot test pieces were molded in exactly the same manner as in Example 4, except that the weight was 1 part by weight.

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

Comparative Example 4 An Izod test piece was molded in exactly the same manner as in Example 1, except that polypropylene and polyoctenylene resin were not used.

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

Claims (1)

[Claims] 1 to 100 parts by weight of polyamide resin and 1 to 100 parts by weight of polyolefin resin
A resin composition comprising 200 parts by weight of a polyoctenylene resin and 1 to 100 parts by weight of a polyoctenylene resin.