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Ester-type resin composition, method for producing said ester-type resin composition, and molded article produced using said ester-type resin

A technology of ester-based resins and compositions, which is applied in the field of ester-based resin compositions, can solve the problems of reduced strength, difficulty in resisting warping, cracking or reduced strength, etc., to prevent a large increase, prevent melt viscosity and solution viscosity, and prevent performance-reducing effect

Active Publication Date: 2015-12-23
NISSHINBO CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the molecular weight of ester-based resins is reduced because the ester groups in the molecule are easily hydrolyzed in moisture, etc.
In addition, it is known that there is a problem that the acidic carboxyl group generated by hydrolysis further promotes the hydrolysis of the ester bond, so that the strength is lowered, and further, due to the lowered strength, the resin itself is difficult to resist the warpage generated when the resin is cured, causing cracks or Intensity is further reduced
[0006] However, when a composition in which a carbodiimide compound is added to an ester resin is melt-kneaded and molded, the carboxyl group in the ester resin reacts rapidly with the carbodiimide group, and the combination The melt viscosity of the product increases, which sometimes impairs the processing suitability

Method used

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  • Ester-type resin composition, method for producing said ester-type resin composition, and molded article produced using said ester-type resin
  • Ester-type resin composition, method for producing said ester-type resin composition, and molded article produced using said ester-type resin
  • Ester-type resin composition, method for producing said ester-type resin composition, and molded article produced using said ester-type resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0112] Hereinafter, the present invention will be described in more detail by giving examples and comparative examples, but the present invention is not limited thereto.

[0113] [evaluation items]

[0114] (1) Solution viscosity (intrinsic viscosity) of ester resin composition

[0115] [Polyester resin (PET): Examples 1-9, Comparative Examples 1-4]

[0116] The melt-kneaded polyester resin (PET) was dried at 130° C. for 4 hours, and 0.15 g of the dried resin was dissolved in 30 mL of phenol / tetrachloroethane = 1 / 1, using a Canon Fenske viscometer at 30 °C for measurement. The unit is (dl / g).

[0117] [Polylactic acid resin (PLA): Examples 10, 11, Comparative Examples 5, 6]

[0118] The melt-kneaded polylactic acid resin (PLA) was dried at 110° C. for 4 hours, 0.15 g of the dried resin was dissolved in 30 mL of chloroform, and measured at 30° C. using a Canon Fenske viscometer. The unit is (dl / g).

[0119] (2) Melt viscosity (melt flow resistance) of ester resin

[0120...

Synthetic example 1

[0129] [Synthesis Example 1] Synthesis of Aliphatic Polycarbodiimide

[0130] Add 100 parts by mass of 4,4'-diisocyanate dicyclohexylmethane and 0.5 parts by mass of carbodiimidization catalyst (3-methyl-1-phenyl-2-phosphorus-1-oxide) into the In a reaction vessel with a stirrer, stirring was carried out at 185° C. for 15 hours under a nitrogen flow to obtain poly-4,4′-dicyclohexylmethanecarbodiimide whose terminal is isocyanate.

[0131] Confirmed by infrared absorption (IR) spectroscopy at a wavelength of 2150cm -1 Around the absorption peak of the carbodiimide group. The NCO% was measured to be 4.88% (average degree of polymerization = 6.7).

[0132] Next, heat the poly-4,4'-dicyclohexylmethane carbodiimide obtained above to 120° C., add 40 parts by mass of polyethylene glycol monomethyl ether (average molecular weight: 400) and heat to 150° C. and react under stirring for 5 hours.

[0133] Confirmed by infrared absorption (IR) spectroscopy with a wavelength of 2200-230...

Synthetic example 2

[0134] [Synthesis Example 2] Synthesis of xylene-based polycarbodiimide

[0135] Add 100 parts by mass of m-tetramethylxylylene diisocyanate and 2 parts by mass of carbodiimidization catalyst (3-methyl-1-phenyl-2-phosphorus-1-oxide) into a mixer with a reflux tube and agitator In a reaction vessel, the mixture was stirred at 180° C. for 32 hours under a nitrogen stream to obtain isocyanate-terminated tetramethylxylylenecarbodiimide.

[0136] Confirmed by infrared absorption (IR) spectroscopy at a wavelength of 2150cm -1 Around the absorption peak of the carbodiimide group. The NCO% was measured to be 3.75% (average degree of polymerization = 10.0).

[0137] Next, the polytetramethylphenylenecarbodiimide obtained above isocyanate-terminated was heated to 120°C, 38 parts by mass of polyethylene glycol monomethyl ether (average molecular weight: 500) was added thereto, heated to 150°C and The reaction was carried out under stirring for 6 hours.

[0138] Confirmed by infrared ...

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Abstract

Provided is an ester-type resin composition which has hydrolysis resistance and does not undergo great increase in a melt viscosity and a solution viscosity. An ester-type resin composition comprising an ester-type resin, a non-xylylene-type aliphatic polycarbodiimide and a xylylene-type polycarbodiimide, wherein the [(non-xylylene-type aliphatic polycarbodiimide) / (xylylene-type polycarbodiimide)] ratio is 0.1 to 10.0 by mass.

Description

technical field [0001] The present invention relates to an ester-based resin composition obtained by blending a carbodiimide-based compound with an ester-based resin, a method for producing the ester-based resin composition, and a molded article using the ester-based resin. Background technique [0002] Ester-based resins such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and the like are resins used in various applications because of their good elasticity and moldability. [0003] However, the molecular weight of the ester-based resin is lowered because the ester group in the molecule is easily hydrolyzed in moisture or the like. In addition, it is known that there is a problem that the acidic carboxyl group generated by hydrolysis further promotes the hydrolysis of the ester bond, so that the strength is lowered, and further, due to the lowered strength, the resin itself is difficult to resist the warpage generated when the resin is cured, causing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/00C08K5/29C08L79/00
CPCC08L79/00C08L67/02C08L67/04C08G18/025C08G18/797C08G18/095C08G18/283C08K5/29
Inventor 伊藤贵彦山崎善宏谷口彰小谷沙织
Owner NISSHINBO CHEM