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Biodegradable PBAT alloy with high starch content and preparation method of biodegradable PBAT alloy

A high-starch, alloy technology, applied in biological packaging, sustainable manufacturing/processing, sustainable packaging industry and other directions, can solve the problems of hindered promotion, poor compatibility between starch and PBAT matrix, high requirements for raw material types and processing methods, etc. To achieve the effect of improving the compatibility of the two phases

Active Publication Date: 2020-10-13
WANHUA CHEM (SICHUAN) CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has high requirements on the types of raw materials and processing methods, and the price of nano-scale starch is high. In the case of high addition amount, the product price is too high and the promotion is hindered.
[0004] It can be seen that the existing problems of high-starch PBAT alloys mainly lie in the poor compatibility between starch and PBAT matrix, resulting in poor mechanical properties of the alloy, while ordinary physical modification of starch can only improve the compatibility of the two to a certain extent. Limited improvement in mechanical properties

Method used

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  • Biodegradable PBAT alloy with high starch content and preparation method of biodegradable PBAT alloy
  • Biodegradable PBAT alloy with high starch content and preparation method of biodegradable PBAT alloy
  • Biodegradable PBAT alloy with high starch content and preparation method of biodegradable PBAT alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Preparation of modified starch (M-starch A):

[0050] Weigh 50g of cornstarch into a three-necked flask, add 800mL of distilled water, put the three-necked flask into a constant temperature water bath, heat and stir, and make it gelatinize at 90°C for 1h. Then add 5g of NaOH and stir evenly, quickly add 25g of ADR4370, react in a closed container at 90°C for 10h, cool to 25°C for 5min, then adjust the pH to neutral with 10% dilute hydrochloric acid, take part of the adjusted pH value of the emulsion and freeze Dry, put the obtained powder into a Soxhlet extractor, wash it with absolute ethanol for 5 hours under reflux, remove unreacted NaOH and other impurities, then dry it in a vacuum oven for 4 hours, and grind it in a crucible to obtain a powdered epoxy-modified starch product , its epoxy value is 0.08.

[0051](2) With modified starch and formula component in table 1 as raw material, and with reference to the raw material consumption in table 1, prepare PBAT al...

Embodiment 2

[0057] (1) Preparation of modified starch (M-starch B):

[0058] Weigh 50g of tapioca starch into a three-necked flask, add 800m L of distilled water, put the three-necked flask into a constant temperature water bath, heat and stir, and make it gelatinize at 95°C for 1h. Then add 5g Na 2 CO 3 And stir evenly, quickly add 10g of epoxy resin E51, react in a closed container at 90°C for 8h, cool to 25°C and keep for 5min, then adjust the pH to neutral with 10% dilute hydrochloric acid, take part of the adjusted pH value of the emulsion and freeze After drying, the obtained powder was put into a Soxhlet extractor and washed with absolute ethanol for 5 h under reflux to remove unreacted Na 2 CO 3 and other impurities, dried in a vacuum oven for 4 hours, and ground in a crucible to obtain a powdery epoxy-modified starch product with an epoxy value of 0.01.

[0059] Using the modified starch (M-starch B) prepared in Example 2 as raw material, and prepare the PBAT alloy according ...

Embodiment 3

[0061] Using the modified starch (M-starch A) prepared in Example 1 as raw material, and prepare the PBAT alloy according to the method in Example 1, the difference is only in the difference in formula and raw material consumption in Table 1, the extrusion of twin-screw extruder The conditions are: the screw speed is 600rpm, and the screw temperature is set in sections from the feeding port to the head: 100°C, 105°C, 110°C, 120°C, 130°C, 135°C, 135°C, 135°C, 145°C, 145°C , 135°C.

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Abstract

The invention provides a biodegradable PBAT alloy with high starch content and a preparation method of the biodegradable PBAT alloy. The PBAT alloy is prepared from the following components: PBAT resin, modified starch, glycerol, water, an antioxidant and a lubricant, wherein the modified starch is multi-epoxy-group modified starch containing epoxy groups. Epoxy groups in the modified starch can react with PBAT, so that the interfacial compatibility of the starch and the PBAT is improved, the proportion of the starch is increased, a chain extension effect can be achieved, and the problem thatthe mechanical property of the PBAT is reduced due to degradation in the processing process is solved.

Description

technical field [0001] The invention belongs to the field of degradable plastics, in particular to a biodegradable PBAT alloy with high starch content and a preparation method thereof. Background technique [0002] In recent years, as people's awareness of ecological environment protection has strengthened, various countries have successively issued bans on plastics, and biodegradable plastics have received more and more attention, and their application fields have continued to expand. In the fields of packaging materials, disposable tableware, agricultural mulch and daily products, it has gradually replaced traditional plastics. Polybutylene terephthalate adipate (PBAT) is a biodegradable material with excellent performance. The degradation rate is greater than 90% after 180 days in a composting environment, and it has high elongation and good toughness. It can be applied to biodegradable Film bag, plastic film, toughened PLA and other fields. Starch is used as a filler, ...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L87/00C08L23/30C08K5/134C08K5/526C08K5/372C08K5/098C08K5/20C08G81/02C08G81/00
CPCC08L67/02C08L87/005C08G81/02C08G81/00C08L2201/06C08L2205/03C08L23/30C08K5/1345C08K5/526C08K5/098C08K5/20C08K5/372Y02W90/10
Inventor 王倩倩邵成立
Owner WANHUA CHEM (SICHUAN) CO LTD
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