Completely biodegradable bamboo microstructure unit and polylactic acid biomass composite and preparation method thereof

Abstract

The invention relates to a completely biodegradable bamboo microstructure unit and polylactic acid biomass composite which is a biomass composite with high content of bamboo material which is prepared by using bamboo material and biodegradable polylactic acid as raw materials and adopting high-speed mixing method. The preparation method comprises the following steps: chipping or cutting bamboo material or bamboo material processing residues in other modes to prepare bamboo chips or bamboo sections; performing flaking separation, fiber pulping or other technologies to bamboo chips or bamboo sections to prepare bamboo microstructure units; weighting bamboo microstructure units and polylactic acid in a weight ratio of 60:40 to 90:10; then performing high-speed mixing in a high-speed mixer to heat materials through friction heating and external heating, mixing with bamboo microstructure units evenly; and using the prepared mixture of bamboo microstructure units and polylactic acid to prepare various high-intensity board or moulded products under the hot pressing technological conditions that the temperature is 150-200 DEG C, the pressure is 1-6MPa and the time is 5-30min.

Description

technical field [0001] The invention relates to a fully degradable bamboo microstructure unit and polylactic acid biomass composite material with high bamboo content and a manufacturing method thereof. Background technique [0002] With the enhancement of people's awareness of environmental protection, more and more attention has been paid to the pollution and burden on the environment caused by the non-degradable plastics that are currently widely used. It has become an inevitable trend in the field of materials science to replace various non-degradable materials with completely biodegradable (or naturally) degradable materials. [0003] Polylactic acid plastic is derived from plant resources. It has good biocompatibility, degradability and good machinability. It is an eco-friendly high molecular weight material with low energy consumption. At present, large-scale production has been realized in the United States and other places. The application of this type of material ...

AI Technical Summary

Problems solved by technology

However, biodegradable plastics such as polylactic acid, like other polymer materials, have poor heat resistance, and the elastic modulus of the material decreases significantly with the increase of temperature, so the use of polymer materials is limited

[0004] For some short-cycle products (such as display boards, seedling trays or pots, etc.), due to the large amount of use, if ordinary plastics that cannot be degraded are used, serious environmental pollution problems will occur; in order to overcome this defect, there is an urgent need for alternatives. product development emerges