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Environment friendly material for manufacturing pen

An environmentally friendly material and the best technology, applied in the field of environmentally friendly materials for pen making, can solve problems such as low production efficiency, poor hydrophilicity, and slow polylactic acid crystallization, and achieve the effects of high production efficiency, good stability, and fast injection molding crystallization.

Inactive Publication Date: 2009-04-08
NINGBO BEIFA GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Also someone once used polylactic acid (PLA) as raw material to make a pen, but because polylactic acid contains a large amount of ester bonds, the hydrophilicity is poor, which reduces its biocompatibility with other substances, and the relative molecular weight distribution of the polymerized product is too high. Wide, and the polylactic acid itself is a linear polymer, which makes the strength of the polylactic acid material unable to meet the requirements, high brittleness, low heat distortion temperature (54°C under load), poor impact resistance, and difficult to control the degradation cycle. Using it to make pens will make the pens easy to crack during the production and assembly process, and because polylactic acid crystallizes slowly during the injection molding process, the production efficiency is very low, it is not suitable for mass production, and the pens produced cannot meet the requirements of container transportation and conventional storage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment one: a kind of processing procedure that is used for the environment-friendly material of making pen is as follows:

[0010] (1), first dehumidify and dry the polylactic acid resin in a low temperature environment of 40-50°C;

[0011] (2), take the dried polylactic acid that is 93% by weight, 1% chain extender, 1% aryl phosphate transparent nucleating agent and 5% calcium carbonate and mix and stir;

[0012] (3), the mixed raw materials are loaded into a twin-screw extruder, and then extruded and cooled;

[0013] (4), granulation to obtain environmentally friendly materials;

[0014] (5) Dehumidify and dry the environmental protection material, and seal the package.

Embodiment 2

[0015] Embodiment two: other steps of the processing process are the same as in embodiment one, the difference is that in the step (2), 94% polylactic acid, 1.2% chain extender, and 0.8% aryl phosphate transparent synthetic compound are taken in the step (2). The nucleating agent is mixed with 4% calcium carbonate to make an environment-friendly material for making pens.

Embodiment 3

[0016] Embodiment three: the other steps of the processing process are the same as in embodiment one, the difference is that in step (2), 95% polylactic acid, 0.8% chain extender, and 1% aryl phosphate transparent synthetic compound are taken in step (2). The nucleating agent is mixed with 3.2% calcium carbonate to make an environment-friendly material for making pens.

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Abstract

The invention discloses an environmentally-friendly material used for producing pens, which is characterized in that the material is composed of the mixture of polylactic acid with weight percentage of 93 percent to 96 percent, a chain extender with weight percentage of 0.8 percent to 1.2 percent which belongs to the ADR series chain extenders produced by BASF AG, an aromatic phosphates transparent nucleator with weight percentage of 0.6 percent to 1.0 percent and calcium carbonate with weight percentage of 2.5 percent to 5 percent. The material has the advantages that the environmentally-friendly material used for producing pens is composed by mixing the polylactic acid, the chain extender, the nucleator and the calcium carbonate in accordance with a certain proportion, wherein, the nucleator can improve the crystal speed of the injection molding of the polylactic acid and the temperature resistance of the polylactic acid, the chain extender can restrain the polylactic acid from degrading during production process and thereby keeping the property of the polylactic acid stable and constant; therefore, the environmentally-friendly material is adopted to produce pens; the strength and temper thereof meet the requirements of production and assembly; besides, the material is characterized by good stability and high production efficiency thereby being applicable to mass production; what is more, the produced pens can meet the requirements of container transport and routine storage.

Description

technical field [0001] The invention relates to an environment-friendly material, in particular to an environment-friendly material used for making pens. Background technique [0002] At present, the pens we use are basically made of plastic or metal, but because plastic is not easy to corrode, it is easy to cause environmental pollution after being discarded. Although metal can be recycled, its cost is relatively high. Pens made of metal are the most popular in the market. Cost competitiveness is relatively weak. Now the whole world is beginning to seek an environmentally friendly material that can replace plastics, and polylactic acid (PLA) is a synthetic polymer material with excellent biocompatibility and biodegradability. It is based on corn, wheat, The starch extracted from some plants such as cassava is used as the initial raw material, which is decomposed by enzymes to obtain glucose, then fermented by lactic acid bacteria to become lactic acid, and finally high-pur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K5/52C08K3/26
CPCC08K5/0083C08K3/26C08L67/04C08K5/527
Inventor 罗荣华
Owner NINGBO BEIFA GRP CO LTD
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