Novel composite degradable plastic material for injection molding and preparation method thereof

Abstract

The invention belongs to the technical field of biodegradable materials, and particularly relates to a novel composite degradable plastic material for injection molding and a preparation method thereof. The novel composite degradable plastic material for injection molding is prepared from the following components in parts by weight: 40-70 parts of PBAT, 10-25 parts of bamboo and wood fibers, 1-10 parts of PBS, 1-10 parts of PLA, 1-5 parts of a filler, 0.5-3.0 parts of a plasticizer, 2-7 parts of a lubricant, 0.1-1 part of a chain extender and 1-5 parts of an antioxidant. The novel composite degradable plastic material for injection molding is good in biodegradability, low in raw material cost, high in percent of pass and high in production efficiency; and the invention also provides a preparation method of the novel composite degradable plastic material.

Description

technical field [0001] The invention belongs to the technical field of biodegradable materials, and in particular relates to a novel composite degradable plastic material for injection molding and a preparation method thereof. Background technique [0002] Injection molding products usually use rubber injection molding, plastic injection molding and molding injection molding. Plastic injection molding is a method of plastic products. At present, molten polyethylene, polypropylene, ABS, PA, polystyrene and other plastics are injected into plastic products under pressure. In the mold, the plastic product is cooled and formed. However, these plastic materials are poorly degradable and cause great pressure on the environment. Therefore, research on biodegradable composite materials is the main direction of research in the contemporary plastics industry. And PBAT (copolymer of butylene adipate and butylene terephthalate) belongs to thermoplastic biodegradable plastics, is very a...

AI Technical Summary

Problems solved by technology

However, these plastic materials are poorly degradable and cause great pressure on the environment. Therefore, research on biodegradable composite materials is the main direction of research in the contemporary plastics industry.

And PBAT (copolymer of butylene adipate and butylene terephthalate) belongs to thermoplastic biodegradable plastics, is very active in the study of biodegradable plastics and one of the best degradable materials in market application, but existing The PBAT product is single, the price is high, and the MI value of PBAT is low, and the intrinsic viscosity is high, so it is not suitable for direct use in the injection molding process. For large-area PBAT injection products, especially large-area thin-walled flexible products, it is easy to cause under-injection and stickiness. Die and other phenomena, low pass rate, low production efficiency

[0003] Patent CN108102318B discloses a biodegradable film material. The biodegradable material is composed of any one or two or more of the group consisting of PLA, PBAT and PBS, and the content is 60-70% by mass; food-grade agricultural Waste, which is finely ground powder of starch, fiber, protein or lipid, the particle size of the food-grade agricultural waste after grinding and drying is at least 50 μm or less, and its content is 10-30% by mass; A film material is made through mixing, blowing, coating and other steps, and the blown film is a biodegradable film, but it still has the disadvantages of sticking to the mold, under-injection, and low productivity

[0004] Patent CN108329529A discloses a fully biodegradable copolymer extruded sheet material, including PLA, PBAT, PBS and plant starch, straw cellulose, fillers, plasticizers and antioxidants. The preparation method is extrusion process to produce plastic sheet , the degradation effect is good, and will not cause secondary pollution, and has the advantages of high temperature resistance and low temperature resistance, but the cost is high

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