2results about How to "Solve easy hydrolysis" patented technology

The invention relates to the technical field of degradable plastics, and particularly discloses a starch-based biodegradable plastic and a preparation method thereof.The preparation method includes the steps that high-amylose starch (such as corn, potatoes and cassava) is selected as a raw material and cleaned, dried and ground to obtain starch powder, a natural plasticizer (such as glycerin) is added to improve the flexibility, and the starch-based biodegradable plastic is obtained; a chemical cross-linking agent (such as glutaraldehyde) is used for enhancing the strength and the heat stability, an antioxidant (such as vitamin E) and an antibacterial agent (such as tea polyphenol) are used as additives, and the mass ratio of the antioxidant to the antibacterial agent is (0.6-0.85): (0.05-0.2): (0.005-0.03): (0.001-0.01): (0.001-0.005). The starch-based bioplastic prepared by the invention has good degradation performance and adjustability, is particularly suitable for the fields of disposable packaging, agricultural films, medical materials and the like, has a natural antibacterial function and ultraviolet protection capability, has huge application potential in the fields of medical treatment, food packaging and environmental protection, and has wide application prospects. The advantages of the starch-based plastic in agricultural application are also realized.

This invention belongs to the field of polyurethane adhesive technology, specifically relating to a two-component bio-based flame-retardant polyurethane potting compound and its preparation method. It consists of component A and component B, with the molar ratio of hydroxyl groups in component A to isocyanate groups in component B being 1:(1-1.05). Component A comprises the following raw materials in parts by weight: bio-based polyol I: 44-55 parts; bio-based polyol II: 44-55 parts; crosslinking agent: 1-2 parts; catalyst: 0.1-0.5 parts; defoamer: 1.0-3.0 parts; silane coupling agent: 0.1-0.5 parts; dehydrating agent: 0.5-1.0 parts; and component B is a modified isocyanate. The potting compound's component A uses bio-based raw materials such as castor oil to synthesize a comb-shaped polyol, improving hydrophobicity and adhesion; component B introduces nitrogen and phosphorus flame-retardant elements into the modified isocyanate, achieving intrinsic flame retardancy.