3results about How to "Strong cohesion" patented technology

The application discloses a normal-temperature curing type super-high-strength epoxy splicing adhesive and a preparation method thereof, and belongs to the technical field of concrete bonding and reinforcing, and the technical scheme is as follows: the epoxy splicing adhesive comprises a resin system, a curing agent system and a reinforcing material, the resin system comprises the following raw materials in parts by weight: 15-20 parts of a composite epoxy resin, 3-5 parts of a multifunctional active diluent, 1-2 parts of an epoxy-based coupling agent, 3-5 parts of a toughening agent, 1-2 parts of an antifoaming agent, 2-5 parts of a wetting dispersant and 40-80 parts of a filler; the curing agent system comprises the following raw materials in parts by weight: 15-30 parts of a composite curing agent, 1-3 parts of an amino coupling agent, 1-2 parts of an antioxidant, 3-5 parts of an accelerator and 30-83 parts of a filler, the epoxy splicing adhesive is prepared by compounding the epoxy resin with different functionalities and the toughening agent, the structure toughness and the crosslinking network density of the cured product are controlled, and the mechanical mechanical properties of the epoxy splicing adhesive are remarkably improved.

The invention provides a preparation method of cross-linked hyaluronic acid gel and a preparation containing microspheres and the cross-linked hyaluronic acid gel. The preparation method comprises the following steps: (1) mixing hyaluronic acid or a salt thereof, a cross-linking agent and an alkaline solution to obtain a mixed solution; (2) carrying out primary cross-linking reaction on the mixed solution to obtain first gel; (3) cutting the first gel into blocks, adding the blocks into an alkaline solution containing hyaluronic acid or salt thereof, and carrying out secondary cross-linking reaction to obtain second gel; and (4) purifying the second gel to obtain the cross-linked hyaluronic acid gel. The prepared hyaluronic acid gel has excellent cohesive force, the microspheres can be uniformly dispersed in the hyaluronic acid gel in an extremely short time, and after the hyaluronic acid gel is mixed with the microspheres, the microspheres can be uniformly distributed in the cross-linked hyaluronic acid gel for a long time and are not easy to displace, settle and agglomerate.

The invention discloses a crystal form A of acetyl L-carnitine hydrochloride, a preparation method of the crystal form A, and a bulk drug, a food additive, a feed additive and a composition containing the crystal form A. The crystal form A of the acetyl L-carnitine hydrochloride is good in solubility, high in stability, high in purity, regular in shape and suitable for being applied to bulk drugs, food additives and feed additives. The preparation method is simple in process, the crystal form A can be obtained at high yield through in-situ crystallization of a reaction solution and dispersion of ethanol, and the preparation method is suitable for large-scale industrial production.