Preparation method of star-shaped polyurethane elastomer toughened polylactic acid compound

A technology of polyurethane elastomer and polylactic acid, which is applied in the field of polylactic acid polymer compound and its preparation, achieves the effects of short production cycle, favorable for popularization and application, and easy-to-obtain and cheap raw materials

Active Publication Date: 2017-09-22
TAIYUAN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no report on the work of star polyurethane toughened polylactic acid

Method used

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  • Preparation method of star-shaped polyurethane elastomer toughened polylactic acid compound
  • Preparation method of star-shaped polyurethane elastomer toughened polylactic acid compound
  • Preparation method of star-shaped polyurethane elastomer toughened polylactic acid compound

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preparation example Construction

[0059] A preparation method for a star-shaped polyurethane elastomer toughened polylactic acid compound, comprising the steps of:

[0060] Put the pre-dried polylactic acid, star polyurethane elastomer and diisocyanate together into the torque rheometer for blending and banburying, at a temperature of 170-210°C, a speed of 30-120 rpm, and a blending reaction of 3-20 Minutes to obtain the star-shaped polyurethane elastomer toughened polylactic acid compound;

[0061] The pre-dried raw materials are calculated in parts by mass, including 60-99 parts of polylactic acid, 1-40 parts of star-shaped polyurethane elastomer, and 0-10 parts of diisocyanate.

[0062] In practice, the polylactic acid is preferably 80-97 parts, the star polyurethane elastomer is preferably 3-20 parts, and the diisocyanate is preferably 0-5 parts, but not zero.

[0063] In the above method, the polylactic acid used is preferably commercially available technical grade polylactic acid, and the diisocyanate u...

Embodiment 1

[0083] 95 parts of pre-dried polylactic acid and 5 parts of star-shaped polyurethane elastomer were added together into a torque rheometer for blending and banburying. At a temperature of 170 ° C and a speed of 30 rpm, the blending reaction was carried out for 3 minutes.

[0084] The synthesis (bulk prepolymerization method) of used star-shaped polyurethane elastomer: in there-necked flask, add number-average molecular weight is 2000 polypropylene glycol 191 parts, the polypropylene oxide ether triol 0.9 part of number-average molecular weight 300 and diphenylmethane 75 parts of diisocyanate were slowly heated to 70°C and stirred for 3 hours to make a prepolymer. Then control the prepolymer at 70-75°C, add 18 parts of butanediol under stirring, pour the solution into the prepared mold when it is viscous, and mold it at 120°C for 40 minutes when it gels. Finally, the obtained sample was placed in an oven at 110°C for post-curing for 20 hours. The composite is tested by injecti...

Embodiment 2

[0086] Add 90 parts of pre-dried polylactic acid and 10 parts of star-shaped polyurethane elastomer together into a torque rheometer for blending and banburying. At a temperature of 180 ° C and a speed of 40 rpm, the blending reaction is carried out for 5 minutes.

[0087] The synthesis (bulk prepolymerization method) of used star-shaped polyurethane elastomer: in there-necked flask, add number-average molecular weight is 2000 polypropylene glycol 191 parts, the polypropylene oxide ether triol 0.9 part of number-average molecular weight 300 and diphenylmethane 75 parts of diisocyanate were slowly heated to 70°C and stirred for 3 hours to make a prepolymer. Then control the prepolymer at 70-75°C, add 18 parts of butanediol under stirring, pour the solution into the prepared mold when it is viscous, and mold it at 120°C for 40 minutes when it gels. Finally, the obtained sample was placed in an oven at 110°C for post-curing for 20 hours. The composite is tested by injection mold...

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Abstract

The invention provides a simple polylactic acid toughening modification method, in particular to a method for preparing a toughened polylactic acid compound by taking star-shaped polyurethane as a toughening modifier. The toughened polylactic acid compound with a better toughening effect is prepared by adding polyisocyanate as a crosslinking agent. The preparation method of the star-shaped polyurethane toughened polylactic acid compound comprises the following steps: adding 60 to 99 parts of polylactic acid, 1 to 40 parts of star-shaped polyurethane and 0 to 10 parts of polyisocyanate into a torque rheometer for compounding and banburying; performing a co-blending reaction at the temperature of 170 to 210 DEG C and at the rotation speed of 30 to 120 revolutions per minute for 3 to 20 minutes. The star-shaped polyurethane is prepared by adopting a simple bulk one-step method or a bulk pre-polymerizing method. The preparation method is easy to operate, is short in preparation period, is high in efficiency, and has the advantages of lowering equipment investment and production cost and overcoming the defects caused by adoption of solvents in the prior art, along with no need of catalyst, environment-friendly production process, and easiness in popularization and application.

Description

technical field [0001] The invention belongs to the technical field of polylactic acid polymer compound and its preparation, and in particular relates to a preparation method of star-shaped polyurethane elastomer toughened polylactic acid compound. Background technique [0002] Polylactic acid is a biodegradable polymer material derived from renewable resources. It is not only derived from renewable resources such as corn and grains, but also has good biocompatibility and degradability. It has been used in biomedicine. It is also generally considered as a traditional petroleum raw material. It is widely used in biomedical materials, packaging materials, daily-use plastic products, textile fabrics, agricultural mulch films and other fields. It has excellent mechanical strength and processability, and has received extensive attention in recent years. The application and promotion of PLA is of great significance to alleviate the current energy crisis and "white pollution" and o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L75/08C08L75/06C08G18/66C08G18/48C08G18/10C08G18/32C08G18/42
CPCC08G18/10C08G18/3206C08G18/4018C08G18/4202C08G18/4238C08G18/4277C08G18/4804C08G18/4812C08G18/4829C08G18/4833C08G18/4854C08G18/664C08G18/6644C08G18/6674C08G18/6677C08L67/04C08L75/08C08L75/06C08G18/3814
Inventor 党海春陈子山靳风驰孙义义伍伟玲褚丽君谭善文翟东杰张艳梅
Owner TAIYUAN INST OF TECH
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