4results about How to "Stable quality control" patented technology

The application relates to the technical field of admixtures for building materials, in particular to a special polycarboxylic water reducing agent for gypsum boards, which comprises the following steps: S1, preparing a multifunctional monomer mixed solution; S2, preparing an initiation system: dissolving polyether macromonomer and a chain transfer agent in part of water, placing the water in a reactor, heating to a preset temperature and keeping constant; S3, performing a gradient copolymerization reaction: under the constant temperature condition, synchronously and slowly adding the multifunctional monomer mixed solution and an oxidant aqueous solution into the initiation system; S4, performing aging and post-treatment: after the addition is completed, keeping constant temperature aging at the preset temperature, then reducing the temperature, and neutralizing with lye until the pH value is 6-7, so that the special polycarboxylic water reducing agent is obtained. The whole process does not need toxic and harmful raw materials such as formaldehyde and naphthalene, and conforms to the green chemistry direction. The problems of demolding difficulty and production line congestion caused by retardation are solved, and the mold turnover rate and the production line efficiency are significantly improved. Under a higher water reducing rate, lower porosity (non-bubble pore) and higher compactness can be obtained.

The application discloses a pesticide synergist and a preparation method thereof. The pesticide synergist comprises a silanol-initiated polyether shown in formula I, an inositol phosphate-initiated polyether shown in formula II, an alcohol auxiliary agent and water. The silanol-initiated polyether shown in formula I and the inositol phosphate-initiated polyether shown in formula II are synergized, so that the adhesion, spreading, penetration and retention capacity of pesticide droplets on a target surface are significantly enhanced, and the utilization rate of the pesticide is effectively improved. The product has the advantages of low toxicity, environmental friendliness, multi-functional synergism, wide compatibility and the like, the preparation process is simple and stable, and the product is suitable for industrial production.

The application relates to the technical field of magnesium alloys, and discloses a Mg-Zn-Ca-Sr medical magnesium alloy and a preparation method thereof, wherein the chemical composition of the alloy is as follows in percentage by mass: Zn 2.0%-6.0%, Ca 0.5%-2.0%, Sr 0.1%-1.0%, inevitable impurity elements less than or equal to 0.2%, and the balance of Mg. The magnesium alloy has good mechanical properties, a degradation rate and biological activity, and provides a solution to the clinical problems such as non-degradability, non-matching elastic modulus and lack of biological activity of traditional medical metals.

This invention provides a dense honeycomb structure cross-linked sodium hyaluronate gel and its preparation method, comprising the following steps: S1. Preparing a chloride ion solution, adding a cross-linking agent, slowly adding sodium hyaluronate under stirring conditions, adjusting the pH to alkaline, and stirring evenly under vacuum conditions to obtain a mixture; S2. Maintaining vacuum conditions, heating the mixture in a water bath, cutting it to obtain a block gel, cross-linking it in a water bath to obtain a cross-linked sodium hyaluronate gel; S3. Adjusting the pH of the cross-linked sodium hyaluronate gel to neutral, performing a first vortex-shear composite grinding treatment to obtain a homogeneous paste-like gel, dialysis, then a second vortex-shear composite grinding treatment, adding non-cross-linked sodium hyaluronate and PBS solution, performing a third vortex-shear composite grinding treatment, filling, and sterilizing to obtain the dense honeycomb structure cross-linked sodium hyaluronate gel. The dense honeycomb structure cross-linked sodium hyaluronate gel obtained by this invention has smooth injection, strong support, long-lasting effect, and low adverse reaction rate.