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Food grade biodegradable polylactic acid-based composite material and application thereof

A technology for biodegradable polyester and composite materials, applied in the field of low-cost biodegradable composite materials, can solve the problems of reducing production costs, the formula does not mention the complex processes of blister molding, blow molding, and surface treatment, so as to reduce production costs, The effect of reducing the cost of raw materials and avoiding cumbersome processes

Active Publication Date: 2014-10-01
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, in order to improve the interfacial bonding force of the composite material and increase the amount of inorganic powder filler, it is usually necessary to use a coupling agent to carry out surface treatment on the inorganic powder, such as in the composition of the talcum powder filled polylactic acid composite material announced by the patent CN101333331A, the amount of talcum powder added can be Up to 40 parts, but its surface treatment process is complicated, which is not conducive to large-scale industrialization and reduction of production costs, and the patent does not mention the mechanical properties of modified composite materials
There are also many studies to improve the compatibility of the blend system, the mechanical properties of the material, and the processability by adding other biodegradable polyesters (such as PBS) to the polylactic acid. The formulation and preparation method of injection molding or plastic-absorbing polylactic acid special resin, but its PBS content is higher, respectively higher than 14wt% and 55wt%, which increases the cost of biodegradable products
In the degradable disposable syringe formula and preparation method published by patent CN100569306C, although plasticizers and inorganic fillers are also added to biodegradable polyester for modification, the formula does not mention that it can be used for blister and blow molding. , and did not explain the improvement effect of its mechanical properties. Blister molding and blow molding processes have high requirements on material toughness, impact resistance, and processability. Therefore, it is used for processing disposable tableware, food-grade packaging materials, films and other products. The preparation method and properties of the biodegradable resin still need to be further studied in order to develop biodegradable products with simple process, low price and easy industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 : Ingredients: Polylactic acid with a weight average molecular weight of 13 and a molecular weight distribution index of 1.3, polybutylene succinate, epoxy soybean oil and 5000 mesh talcum powder are raw materials, and the weight ratio of each raw material is polylactic acid: poly Butylene succinate: epoxidized soybean oil: talc = 76.5:8.5:5:10.

[0020] Preparation:

[0021] After drying the above raw materials in a vacuum oven at 80°C for 10 hours, first place polylactic acid and polybutylene succinate in a high-speed mixer, stir at a high speed of 1440r / min for 1 minute, and then drop in Epoxidized soybean oil; after dropping, continue to stir at high speed (1440r / min) for 1 minute, finally add talcum powder, and stir at 730r / min for 2 minutes at low speed to obtain the primary mixture;

[0022] Add the above-mentioned primary mixture into a twin-screw extruder for melt blending modification, extrude and granulate, and obtain a food-grade biodegradable p...

Embodiment 2

[0024] Embodiment 2: withThe weight-average molecular weight is that polylactic acid, poly(butylene terephthalate-butylene adipate), epoxy fatty acid methyl ester and 5000 mesh talcum powder that the molecular weight distribution index is 1.3 are raw materials, and each raw material The weight ratio is polylactic acid: poly(butylene terephthalate-butylene adipate): epoxy fatty acid methyl ester: talcum powder=58.5:6.5:10:25.

[0025] Preparation:

[0026] After drying the above raw materials in a vacuum oven at 60°C or 80°C for 12 hours, first place polylactic acid and poly(butylene terephthalate-butylene adipate) in a high-speed stirrer at high speed ( 1440r / min) stirring for 0.5 minutes, then drop in epoxy fatty acid methyl ester while stirring; after dropping, continue to stir at high speed for 1 minute, finally add talcum powder, stir at 730r / min at low speed for 2 minutes to obtain the primary mixture;

[0027] The above-mentioned initial mixture is added to a twin-scr...

Embodiment 3

[0029] Embodiment 3: with The weight average molecular weight is 17 polylactic acid, polybutylene succinate, epoxidized soybean oil, acetyl tributyl citrate and 1250 mesh talcum powder with a molecular weight distribution index of 1.4 as raw materials, and the weight ratio of each raw material is polylactic acid : Polybutylene succinate: Epoxidized soybean oil: Acetyl tributyl citrate: Talc = 72:8:2.5:2.5:15.

[0030] Preparation:

[0031] After drying the above raw materials in a vacuum oven at 80°C for 8 hours, first place polylactic acid and polybutylene succinate in a high-speed mixer, stir at high speed (1440r / min) for 0.5 minutes, and then drop in Epoxidized soybean oil and acetyl tributyl citrate; after dropping, continue to stir at high speed for 1 minute, finally add talcum powder, and stir at low speed (730r / min) for 2 minutes to obtain the primary mixture;

[0032] The above-mentioned initial mixture is added to a twin-screw extruder for melt blending modificatio...

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Abstract

The invention relates to a food grade biodegradable polylactic acid-based composite material which is prepared by drying, mixing and performing one-step melt blending modification and extrusion pelleting on four components, namely, 55-85wt% of polylactic acid, 2-10wt% of biodegradable polyester, 3-10wt% of food grade plasticizer and 10-30wt% of inorganic packing, in a double-screw extruder, wherein the inorganic packing is inorganic packing without surface treatment, and the average particle size of the inorganic packing is 2.7-19 micrometers; the weight-average molecular weight of the polylactic acid is 100000-180000, and the molecular weight distribution index is 1.2-2.0. All components of the composite material are non-toxic food grade materials, the content of the inorganic packing is high, the mechanic property and the thermal resistance of the composite material are remarkably improved, and thus the composite material can be used as a resin universal for sucking molding, injection modeling and blowing injection, a one-step mixing process is adopted, tediousness in the conventional inorganic powder pretreatment is avoided, continuous production is achieved, and the production cost is greatly lowered.

Description

technical field [0001] The invention relates to a food-grade biodegradable polylactic acid-based composite material with high toughness and simple modification process and its preparation method, in particular to a low-cost biodegradable polylactic acid-based composite material that can be used as a general-purpose resin for injection molding, blister molding, and blow molding processes. composite material. Background technique [0002] In recent years, countries around the world have successively promulgated laws and regulations to restrict the use of general-purpose plastics in certain fields, and then the market demand for biodegradable materials has become more and more urgent. Our country loses as much as 20 billion yuan every year because product packaging does not meet the requirements of importing countries. Polylactic acid As a green packaging material, it has been certified by many countries in the world, and the development of polylactic acid has become a hot spot...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L67/02C08L69/00C08K3/26C08K3/34C08K3/22C08K5/1515C08K5/10C08K5/103C08K5/11B29B9/06B29C47/92B29C48/92
CPCB29C47/92B29C48/40B29C48/92B29C2948/9259B29C2948/92704B29C2948/92895
Inventor 陈丽杰宋国林刘源唐国翌罗杰
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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