44results about How to "Adjust physical and chemical properties" patented technology

The invention discloses a special suspension liquid compound fertilizer for saline-alkali soil and a preparation method of the special suspension liquid compound fertilizer. The compound fertilizer comprises the following raw materials in parts by weight: 0.8-7.2 parts of a nitrogen fertilizer, 0.6-1.1 parts of a boric fertilizer, 0.5-0.8 part of EDTA-Zn, 0.5-0.8 part of EDTA-Mn, 2.0-5.0 parts of humic acid powder, 7.0-14.0 parts of a calcium fertilizer 8.0-16.0 parts of a phosphatic fertilizer, 5.0-9.0 parts of a potash fertilizer, 14.0-19.0 parts of an organic matter, 6.0-9.5 parts of a soil conditioner, 0.8-2.0 parts of a microbial agent, 2.0-4.0 parts of a wetting dispersant, 2.0-4.0 parts of an emulsifier, 1.0-3.0 parts of a thickener, 1.5-3.0 parts of an antifreezing agent and 23-30 parts of water. Through reasonable compounding of various nutritional ingredients, especially an efficient synergistic effect among the humic acid, the soil conditioner and the microbial agent, the physical and chemical properties of the soil are well adjusted, re-accumulation of saline matters is avoided, and nutrient elements required for growth and development are provided for crops, thus better growth of roots of the crop is facilitated, the yield and the quality of the crop are improved, and meanwhile, the element deficiency of the crop can be effectively prevented.

The invention relates to a preparation method of poly-amino acid-based triblock copolymer gel, belonging to the technical field of chemical engineering and comprising the following steps: preparing amino-terminated polyethylene glycol macromolecules through alkynyl-terminated polyamide-amine by a click chemistry method; inducing the ring opening polymerization of Gamma-benzyl-L-glutamic acid-N-carboxylic acid anhydride through the amino-terminated polyethylene glycol macromolecules obtained in the first step and preparing a poly (L-benzyl-glutamate)-polyethylene glycol-poly (L-benzyl-glutamate) triblock copolymer; and dissolving the poly (L-benzyl-glutamate)-polyethylene glycol-poly (L-benzyl-glutamate) triblock copolymer obtained in the second step into toluene, heating, stirring, cooling and standing to obtain the gel. The invention forms the symmetrical sector-linear-sector poly-amino acid-based triblock copolymer gel with different topological structures, thereby conveniently adjusting physical and chemical properties of the poly-amino acid-based gel through the topological structures of the macromolecules and the length of the support arms of the copolymer.

The invention discloses an alkaline weld backing material. The finished alkaline weld backing material comprises the following components in percentage by weight: 40-75% of MgO and / or CaO, 15-40% of SiO2, 0-25% of Al2O3, 0-3% of Fe2O3 and 0.5-4% of Na2O and / or K2O; the alkalinity of the alkaline weld backing material is greater than 1. The alkaline weld backing material has the benefits that through a preferred material formula, the alkalinity of backing slag is controlled, the physicochemical property of the backing slag is adjusted, and the requirements on a high-strength high-toughness welding joint are met. Through the adoption of the backing material for welding, a formed welding seam is uniform and smooth no matter in a downward welding or vertical welding position. Compared with the conventional cordierite backing material, the mechanical properties, in particular to the low-temperature impact toughness, of the welding seam are remarkably improved. Besides, through the adjustment of the formula of the raw materials, the alkalinity of the backing slag is controlled, and different mechanical property requirements on the welding joints can be met.