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Molded product

A molded product and injection molding technology, applied in the field of molded products, can solve problems such as lower elastic modulus, poor crystallinity, and weight loss, and achieve the effects of low water absorption, high crystallinity, and excellent dimensional stability

Active Publication Date: 2018-02-06
MITSUBISHI GAS CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in polyamide 66, due to water absorption, molded products having an elastic modulus of about 3 GPa will be reduced until the elastic modulus is less than 1 GPa.
Moreover, this aspect is the most problematic, and molded products of aliphatic polyamide resins have the following disadvantages: chemical resistance, especially in the presence of acids or alkalis, the loss of weight, strength, and elastic modulus are significantly reduced.
Although the above composition is excellent in water absorption and chemical resistance, it may be poor in crystallinity

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0128] Hereinafter, the present invention will be more specifically described based on examples, but the present invention should not be limitedly interpreted as the following examples / comparative examples.

[0129] [use material]

[0130] The materials used in Examples and Comparative Examples are as follows.

[0131]

[0132] As the aliphatic polyamide resin (A), the following commercial items were used.

[0133] ·Polyamide 6 (Ny6)

[0134] Manufactured by UBE INDUSTRIES, LTD. 1024B, molecular weight 28,000, melting point 225°C, glass transition point 48°C

[0135] ·Polyamide 66 (Ny66)

[0136] CM3001N manufactured by Toray Co., Ltd., molecular weight 25,000, melting point 265°C, glass transition point 50°C

[0137]

[0138] As the polyamide resin (B), those produced in the following production examples 1 to 4 were used.

manufacture example 1

[0139]

[0140] After heating sebacic acid (manufactured by Ito Oil Co., Ltd., TA GRADE) at 170°C to melt in the reactor, m-xylylenediamine (manufactured by Mitsubishi Gas Chemical Co., Ltd., MXDA) was added while stirring the contents. While m-xylylenediamine was slowly added dropwise at a molar ratio of 1:1 to sebacic acid, the temperature was raised to 240°C. After completion of the dropwise addition, the temperature was raised to 260°C. After completion of the reaction, the contents were taken out in the form of strands and granulated with a granulator. The obtained pellets were put into a drum, and solid-phase polymerization was carried out under reduced pressure to obtain a polyamide resin with adjusted molecular weight.

[0141] The polyamide resin (MXD10) measured by the following method has a melting point of 191°C, a glass transition point of 60°C, a number average molecular weight of 30,000, and an oxygen permeability coefficient of 0.8cc·mm / m 2 day atm.

[014...

manufacture example 2

[0143]

[0144] Weigh and add accurately weighed sebacic acid (manufactured by Ito Oil Co., Ltd. GRADE) 8950g (44 moles), calcium hypophosphite 13.7401g (150ppm in terms of phosphorus atomic concentration in the polyamide resin), sodium acetate 10.6340g. In addition, the molar ratio of calcium hypophosphite and sodium acetate was 1.0. After the inside of the reaction vessel was sufficiently replaced with nitrogen, the pressure was increased to 0.3 MPa with nitrogen, and the temperature was raised to 160° C. while stirring to uniformly melt sebacic acid.

[0145] Next, 6026 g (44 mol) of p-xylylenediamine (PXDA) was dropped over 170 minutes with stirring. During this period, the internal temperature was continuously raised to 281°C. In the dropping process, the pressure is controlled at 0.5 MPa, and the generated water is discharged out of the system through a dephlegmator and a condenser. The temperature of the partial condenser is controlled within the range of 145-147°C...

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Abstract

The present invention provides a molded article with low water absorption, excellent chemical resistance, and high crystallinity. A molded article formed by molding a polyamide resin composition containing 50 to 99 parts by mass of an aliphatic polyamide resin (A) and 70 mol% or more of diamine structural units 50 to 1 part by mass of polyamide resin (B) derived from xylylenediamine and 50 mol% or more of the dicarboxylic acid structural unit derived from sebacic acid (wherein, the total of (A) and (B) is 100 parts by mass.).

Description

technical field [0001] The present invention relates to a molded article formed by molding a polyamide resin composition. Specifically, the present invention relates to a molded article having high chemical resistance, low water absorption, and high dimensional stability. Moreover, this invention relates to the manufacturing method of the said molded article. Background technique [0002] Considering excellent mechanical properties such as strength, impact resistance, wear resistance, excellent heat resistance, and good impact resistance, polyamide resins are generally used in electrical / electronic instrument parts, automotive parts, OA (office automation) instrument parts, It is widely used in fields such as various machine parts, building materials and housing construction related parts. [0003] Among them, aliphatic polyamide resins such as polyamide 6 and polyamide 66 are widely used as common engineering plastics because of their excellent characteristics and ease of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/00
CPCC08L77/02C08L77/06C08L2205/02C08K13/04C08K7/14C08K3/34C08G69/265B29C43/003B29C45/0001B29C51/10B29K2077/00B29C49/0005
Inventor 小黑叶月三田寺淳
Owner MITSUBISHI GAS CHEM CO INC
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