Method for modifying fast-crystallization high-crystallinity polylactic acid

A high-crystallinity, polylactic acid technology, applied in the field of rapid crystallization high-crystallinity polylactic acid modification, can solve the problems of high production cost, reduced production efficiency, low effect, etc., and achieves low reaction conditions, high crystallinity, and operation. simple effect

Inactive Publication Date: 2015-09-02
常州龙骏天纯环保科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding a plasticizer can improve the crystallization performance of polylactic acid, but the effect is not outstanding, and a large amount of plasticizer will also increase the production cost; to obtain a highly left-handed polylactic acid must have a very specific catalyst and a relatively harsh synthesis process. The reaction conditions are relatively high, and the production cost is relatively high; to improve the crystallization performance of polylactic acid during injection molding, a relatively high mold temperature is usually set to prolong the cooling time, but this will undoubtedly increase energy consumption and reduce production efficiency; adding crystallization nucleation The amount of agent required is small, not only the nucleation effect is outstanding, but also the good mechanical properties of polylactic acid can be maintained

Method used

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  • Method for modifying fast-crystallization high-crystallinity polylactic acid
  • Method for modifying fast-crystallization high-crystallinity polylactic acid
  • Method for modifying fast-crystallization high-crystallinity polylactic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Dissolve 5g of phenylphosphoric acid in 200ml of water, an equivalent of magnesium chloride (MgCl 2 ) was dissolved in 100ml of water and added to the phenylphosphoric acid solution, fully stirred evenly. Then neutralize with 0.1mol / L sodium hydroxide solution to make the pH value of the solution about 5. After the precipitate was washed and filtered with suction, it was stirred at a constant temperature of 30°C for 24 hours to improve the crystallinity. The precipitate was repeatedly washed and filtered, fully dried and dehydrated, and sealed for storage.

[0020] The polylactic acid and the nucleating agent were dried, and the 100:0.5 raw material was added to the HAAKE torque rheometer, the blending temperature was 160°C, the blending time was 5min, and the rotation speed was 30r / min to obtain the modified polylactic acid. Store in a dry dish.

Embodiment 2

[0022] Dissolve 5g of phenylphosphoric acid in 200ml of water, an equivalent of zinc chloride (ZnCl 2 ) was dissolved in 100ml of water and added to the phenylphosphoric acid solution, fully stirred evenly. Then neutralize with 0.1mol / L potassium hydroxide solution to make the pH value of the solution about 5. After the precipitate was washed and filtered with suction, it was stirred at a constant temperature of 40° C. for 24 hours to improve the crystallinity. The precipitate was repeatedly washed and filtered, fully dried and dehydrated, and sealed for storage.

[0023] Polylactic acid and nucleating agent were dried, and 100:1 raw materials were added to the HAAKE torque rheometer, the blending temperature was 170°C, the blending time was 7min, and the rotation speed was 40r / min to obtain modified polylactic acid. Store in a dry dish.

Embodiment 3

[0025] Dissolve 5g of phenylphosphoric acid in 200ml of water, an equivalent of aluminum chloride (AlCl 3 ) was dissolved in 100ml of water and added to the phenylphosphoric acid solution, fully stirred evenly. Then neutralize with 0.1mol / L ammonia solution to make the pH value of the solution about 6. After the precipitate was washed and filtered with suction, it was stirred at a constant temperature of 50° C. for 72 hours to improve the crystallinity. The precipitate was repeatedly washed and filtered, fully dried and dehydrated, and sealed for storage.

[0026] The polylactic acid and the nucleating agent were dried, and the 100:3 raw material was added to the HAAKE torque rheometer, the blending temperature was 180°C, the blending time was 9min, and the rotational speed was 50r / min to obtain the modified polylactic acid. Store in a dry dish.

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Abstract

The invention discloses a method for modifying fast-crystallization high-crystallinity polylactic acid, and provides fast-crystallization high-crystallinity polylactic acid prepared by taking a phenyl phosphate nucleating agent and polylactic acid as main raw materials. The method comprises the following steps of firstly preparing a high-crystallinity nucleating agent by utilizing raw materials, namely phosphenylic acid, chloride, alkali and the like; then adding experimental raw materials, namely the nucleating agent, the polylactic acid and the like, to an HAAKE torque rheometer according to a polymer crystallizing principle for blending so as to prepare a sample. According to the method, the obtained modified polylactic acid is reduced in crystallization temperature to 109 DEG C and enhanced in crystallinity by about 107% in a crystallization process, and the half-crystallization time of the modified polylactic acid is reduced by about 15 times compared with the half-crystallization time of pure polylactic acid.

Description

technical field [0001] The invention relates to a modification method of rapid crystallization and high crystallinity polylactic acid. Background technique [0002] Polylactic acid is a polymer obtained by artificial chemical synthesis of lactic acid produced by biological fermentation. Lactic acid exists in many natural or microbial fermentation products and is the basic metabolic medium in most living organisms. Due to the optical activity of lactic acid, there are three stereo configurations of polylactic acid: poly-L-lactic acid (PLLA), poly-D-lactic acid (PDLA) and poly-racemic lactic acid (PDLLA). Among them, PLLA and PDLLA are the most commonly used and the easiest to prepare. Polylactic acid is a semi-crystalline polymer with good strength and rigidity, but its disadvantages are poor impact resistance and brittle fracture. [0003] The crystallization process of polymers is generally divided into two parts: crystal nucleation and crystal growth. The degree of crys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/53C08L67/04
Inventor 支朝晖李炳健
Owner 常州龙骏天纯环保科技有限公司
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