5results about How to "Reduce white pollution" patented technology

This invention relates to a method for preparing polylactic acid (PLA) by straw fermentation coupled with lactide ring-opening polymerization, belonging to the field of biomass resource utilization and bio-based polymer materials technology. To address the problems of high energy consumption and low sugar conversion rate in existing PLA preparation methods using crop straw, this invention provides a method for preparing PLA by straw fermentation coupled with lactide ring-opening polymerization. The method involves crushing the straw, pre-treating it with dilute acid coupled with steam explosion, washing and drying it, adding a complex cellulase and Lactobacillus pentosus LB-1 seed culture, and simultaneously saccharifying and fermenting under controlled temperature and pH to obtain a lactic acid fermentation broth. The fermentation broth undergoes multi-stage filtration, ion exchange, and concentration to obtain refined lactic acid, which is then prepolymerized, depolymerized, and distilled to obtain L-lactide. After purification, an initiator and antioxidant are added, and ring-opening polymerization, extraction, and drying are performed under nitrogen protection to obtain pure PLA. This invention features efficient and low-energy straw pretreatment, high sugar-acid conversion rate during fermentation, precise purification, stable polymerization, and low cost, making it a green and economical method using straw as raw material.

The utility model provides a kind of HNSPS low energy consumption external wall external thermal insulation system, it is related to external wall thermal insulation technical field, including base wall, adhesive layer, thermal insulation layer and protective layer;Base wall includes concrete wall or masonry wall;Adhesive layer includes bonding mortar and anchor bolt, bonding mortar is located base wall outside;Thermal insulation layer is HNSPS insulation board, thermal insulation layer is located between adhesive layer and the protective layer of outermost layer.The utility model has the beneficial effects of: reasonable in design, simple structure, safe and reliable, improve the fire performance of system, reduce the fire occurrence in the use process of the product.

The application provides a residual film recycling machine and belongs to the technical field of agricultural land preparation machinery. The machine comprises a main frame body, a first support frame is installed at the bottom of one side of the main frame body, spring bodies are installed at the top of both sides of the first support frame, and an electric telescopic rod is installed at the bottom of the first support frame. The soil loosening and stem collecting mechanism and the stem conveying and soil vibrating mechanism are arranged. The soil loosening and stem collecting mechanism can be used to quickly collect the stems and leaves of high-ridge crops such as strawberries after the fruits are harvested when the land is prepared in high-ridge fields. Meanwhile, the soil covering the residual film on both sides of the residual film is loosened, which provides convenience for the subsequent residual film recycling operation. The stem conveying and soil vibrating mechanism conveys the stems and leaves to the top of the device after the stems and leaves are collected, and the stems and leaves are effectively separated from the soil residues by means of the vibration generated by the movement of the device during the conveying process.

The utility model provides a transplanting cup, and relates to the technical field of tobacco planting. The transplanting cup comprises a first cup body and a second cup body, and the first cup body is cylindrical; the second cup body movably covers the upper end of the first cup body; wherein the first cup body and the second cup body are matched to form a protection space, the protection space has an adjusting state and a protection state, when the protection space is in the protection state, the second cup body completely covers the upper end of the first cup body, and the second cup body is moved so that the protection space can be switched to the adjusting state from the protection state. According to the transplanting cup, on the premise that the tobacco seedling protection effect is guaranteed, the requirements of the tobacco seedlings for temperature and humidity in different growth stages, different environments and different weather states are met adaptively.

The utility model provides a kind of agricultural special grass-preventing cloth of PET flat yarn, it relates to grass-preventing cloth technical field, including grass-preventing cloth main part, grass-preventing cloth main part from top to bottom including waterproof heat preservation layer, woven cloth layer, slow-release layer and waterproof flow drip layer, the flat yarn woven from the flat yarn made of recycled PET bottle piece of woven cloth layer. The first side and the third side of grass-preventing cloth main part are evenly provided with fixed rope, fixed block and sealing sleeve, the fixed block side is equipped with the slot, the slot inside one side wall is fixedly connected with elastic clamping block, the sealing sleeve inside sleeve joint has the mouth rope. The flat yarn made of recycled PET bottle piece is used for weaving the woven cloth layer of grass-preventing cloth, so that the grass-preventing cloth produced has the ultraviolet resistance, antioxidant property of PET material, and mechanical strength is superior to PP, simultaneously without chemical additive, and tensile strength is high.