5results about How to "Strong cohesion" patented technology

The application discloses a preparation method of Y molecular sieve, which comprises the following steps: mixing a silicon source, an aluminum source, an alkali source and a template agent to form a molecular sieve mother liquor, and performing crystallization, filtration, washing, drying and calcination to obtain the Y molecular sieve, wherein the template agent is polydialkyldimethylammonium chloride. The Y molecular sieve synthesis method is simple, the template agent used is environment-friendly and low in price, and the Y molecular sieve prepared by the method has the advantages of high silicon-aluminum ratio, large specific surface area, high crystallinity and good mass transfer effect.

An adhesive composition comprising a copolymer (A), a crosslinking agent (B), and an aqueous medium, wherein the copolymer (A) has structural units derived from a monomer (a1), structural units derived from a monomer (a2) having a carboxyl group, and structural units derived from a monomer (a3) ​​having an alkoxysilyl group, wherein the monomer (a1) is composed of either or both of an alkyl (meth)acrylate having only one olefinic double bond and a hydrocarbon having only one olefinic double bond, wherein the structural units in the copolymer (A) derived from the monomer (a2) are relative to those derived from the monomer (a1). The content of the structural unit in the copolymer (A) is 1.0 part by mass or more and 12 parts by mass or less in 100 parts by mass, and the content of the structural unit derived from the monomer (a3) ​​in the copolymer (A) is 0.010 parts by mass or more and 3.5 parts by mass or less in 100 parts by mass relative to the structural unit derived from the monomer (a1). The crosslinking agent (B) contains one or more selected from polycarbodiimide compounds, polyepoxide compounds and polyisocyanate compounds, and the content of the crosslinking agent (B) is 0.010 parts by mass or more and 10 parts by mass or less in 100 parts by mass relative to the copolymer (A).

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.