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A kind of high tenacity multi-block copolyester elastomer and preparation method thereof

A copolyester elastomer and multi-block technology, which is applied in the field of block copolyester and its preparation, can solve the problems of limited application and high brittleness, and achieve a wide range of applications

Active Publication Date: 2017-10-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As disclosed in CN 101768246B, diisocyanate is used as a chain extender, prepolymer I is a hydroxyl-terminated aliphatic polyester, prepolymer II is a hydroxyl-terminated aromatic polyester or another hydroxyl-terminated aliphatic polyester, and a A multi-block copolyester, the measured tensile strength of the copolyester is 10-67MPa, the elongation at break is 20-1080%, and the stress-strain test of the copolyester finds that polysuccinic acid Ethylene glycol ester-block-polybutylene succinate (PES-b-PBS) and polytrimethylene adipate-block-polybutylene succinate (PPA-b-PBS) copolymerization There are obvious initial yield and multiple yields caused by tensile orientation crystallization, such as figure 1 As shown, that is to say, the copolyester presents the characteristics of a plastic, and the defect of high brittleness still exists, which will undoubtedly limit its application in a wider range of fields.

Method used

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  • A kind of high tenacity multi-block copolyester elastomer and preparation method thereof
  • A kind of high tenacity multi-block copolyester elastomer and preparation method thereof
  • A kind of high tenacity multi-block copolyester elastomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Put hydroxyl-terminated polytrimethylene succinate with an intrinsic viscosity of 0.11dL / g and hydroxyl-terminated polyethylene succinate with an intrinsic viscosity of 0.11dL / g in a reaction device at a weight ratio of 5:5 , under the protection of nitrogen, stir and heat up until it is completely melted, then add chain extender toluene diisocyanate in an amount of 10% of the total amount of the prepolymer, and react at 150 ° C for 1 hour to obtain the product.

[0028] The intrinsic viscosity of the obtained product was 1.53dL / g; the melting point was 100.5°C; the tensile strength of the film was 37.8MPa, and the elongation at break was 1620%.

Embodiment 2

[0030] Put hydroxyl-terminated poly(trimethylene succinate) with an intrinsic viscosity of 0.32dL / g and hydroxyl-terminated poly(butylene adipate) with an intrinsic viscosity of 0.22dL / g in the reaction device at a weight ratio of 10:1 In the process, under the protection of nitrogen, stir and heat up to its complete melting, then add chain extender diphenylmethane diisocyanate in an amount of 1.8% of the total amount of the prepolymer, and react at 100°C for 3 hours to obtain the product.

[0031] The intrinsic viscosity of the obtained product is 1.23dL / g; the melting point is 40.8°C; the tensile strength of the film is 10.2MPa, and the elongation at break is 2207%.

Embodiment 3

[0033] The hydroxyl-terminated poly(trimethylene succinate) with an intrinsic viscosity of 0.24 dL / g and the hydroxyl-terminated poly(trimethylene sebacate) with an intrinsic viscosity of 0.33 dL / g are placed in the reaction device in a weight ratio of 6:4, Stir and heat up under the protection of nitrogen until it is completely melted, then add chain extender 1,6-hexamethylene diisocyanate in an amount of 4.1% of the total amount of the prepolymer, and react at 120°C for 2 hours to obtain the product.

[0034] The intrinsic viscosity of the obtained product is 2.84dL / g; the melting point is 84.5°C; the tensile strength of the film is 38.7MPa, and the elongation at break is 1206%.

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Abstract

The invention discloses a high-toughness multiblock copolyester elastomer. The high-toughness multiblock copolyester elastomer has the structural general formula shown in descriptions, wherein R represents an alkyl part of diisocyanate, each of j, k and n is an integer greater than 6, each of x and a is an integer between 2 and 10, y is an integer between 0 and 8, y is not equal to 2 when x is equal to 3, and x is not equal to 3 when y is equal to 2. The high-toughness multiblock copolyester elastomer has the limiting viscosity number of 1.0-3.2dL / g, the melting point of 40-240 DEG C, the tensile strength of 10-50MPa and the elongation at break of 1,112-2,200%. The invention further discloses a preparation method of the high-toughness multiblock copolyester elastomer. According to the high-toughness multiblock copolyester elastomer prepared by the preparation method, the melting point and molecular weight are high, the mechanical properties are excellent, and the controllability and repeatability are good, so that the range of application of the high-toughness multiblock copolyester elastomer prepared by the preparation method can be wider.

Description

technical field [0001] The invention belongs to the technical field of block copolyester and its preparation, and in particular relates to a high-toughness multi-block copolyester elastomer and a preparation method thereof. Background technique [0002] Due to the consumption of petroleum resources and environmental pollution, bio-based and biodegradable materials have attracted more and more attention. Among them, aliphatic polyester is a research hotspot in the field of polymer synthesis for this type of environmentally friendly polymer. The aliphatic polyester synthesized from dibasic acid and dibasic alcohol has rich sources of raw materials, economical price, controllable structure and performance, complete biodegradability, good mechanical properties, processing properties and thermal properties, and is especially popular among people. favored by. However, such polymers also have certain defects, such as high crystallinity, poor degradation performance, high brittlene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/42
CPCC08G18/4202C08G18/4211C08G18/4213C08G18/4241
Inventor 王玉忠李绍龙吴芳曾建兵陈思翀吕亮丁步鹏
Owner SICHUAN UNIV
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