53results about How to "Increase the amount of grafting" patented technology

The invention provides a preparation method of biocompatible silicone rubber. The method comprises the following steps: (1) fully stirring polydimethylsiloxane, adding a mixed crosslinking agent of a deoximation type crosslinking agent and a dealcoholization type crosslinking agent, continuously vacuumizing and stirring, adding a catalyst and vulcanizing at room temperature; (2) treating room temperature vulcanized silicone rubber by virtue of plasmas and generating hydroxyl active sites on the surface of the silicone rubber; adding silicone rubber and organic amine treated by plasma into a nonpolar solvent, stirring under an icy salt bath, dropwise adding a mixed liquid containing a brominating agent and a nonpolar solvent, removing the icy salt bath, raising to room temperature, and continuously stirring in a dark place to obtain silicone rubber with a bromine group on the surface; and (3) putting the silicone rubber with the bromine group on the surface, an acrylamide monomer and a CuCl / bpy catalyst in a reaction container, injecting a degassed solvent into the reaction container by virtue of an injector, and putting the reaction container in a constant temperature oil bath to react; and washing and drying to obtain hydrophilic silicone rubber grafted with polyacrylamide on the surface.

The invention discloses a grafting method of camellia japonica. During three grating periods, three methods of grating camellia japonica to the camellia tree stumps are adopted at the same time. In the first period, branches of camellia japonica are grated to external branches of the camellia tree stumps after the camellia tree stumps are transplanted. In the second period, branches of camellia japonica are grated to buds of internal branches of the camellia tree stumps within a month after internal branches of the camellia tree stumps germinate. In the third period, buds of camellia japonica branches are grated to internal branches of the camellia tree stumps when the camellia tree stumps grow vigorously next year by field planting. A grating method with grafting survival rate higher than an independent period is obtained. Flowers can bloom in advance after grafting. The duration for forming corollas is shortened so that camellia japonica with great economic value can be rapidly obtained. Refined camellia japonica trees with corollas can be acquired within nine months after grafting. The scion survival rate is up to above 85%.

The invention discloses a method for carrying out real silk fabric anti-crease and antibacterial finishing by virtue of a laccase-TEMPO process. Quinones active groups are generated through catalyzing tyrosine residual groups in real silks by laccase so that chitosan molecules are grafted on the real silks; then 2,2,6,6-tetramethylpiperidine-nitrogen oxide (TEMPO) is added and is used for catalyzing chitosan and tyrosine in the real silks to generate formyl groups, so that the grafting amount and bonding firmness of the chitosan on the real silks are increased, and the real silk fabric anti-crease and antibacterial finishing is realized. The method comprises the following specific steps of: (1) catalytically oxidizing the tyrosine residual groups in the real silks by the laccase; (2) taking the chitosan and the quinones active groups in the real silks to react; (3) catalyzing the real silks by laccase-TEMPO to graft the chitosan; and (4) washing the real silks with water and then treating. Compared with traditional chemical cross-linking-process vacuum fabric anti-crease and antibacterial finishing, the method has the advantages that the grafting efficiency of the chitosan is high, enzyme treatment conditions are moderate, the real silk fabric anti-crease and antibacterial effect is relatively good and the strength of the fabric is improved.

The invention discloses a preparation method of a high-quality breathable hot melt adhesive film. The preparation method comprises steps as follows: BPO (benzoyl peroxide) and DCP (dicumyl peroxide) in a mass ratio being 3:(1-1.5) are dissolved by ethyl acetate with the concentration of 30%, and an initiator solution is prepared; an EAA (ethylene acrylic acid copolymer) and MAH (maleic anhydride) in a mass ratio being 100:(1.5-2) are uniformly stirred in a blender mixer, the initiator solution is added to the blender mixer and is uniformly stirred, and then a modified hot melt adhesive raw material is prepared through melt grafting granulation by means of a double-screw granulator with seven temperature regions; an antioxidant, a hyperdispersant and an anti-blocking agent are added to the modified hot melt adhesive raw material, and a mixture is placed in a kneading machine for mixing; the mixture is subjected to extrusion by a single-screw extruder and is processed by an embossing and piercing roller, a casting machine and an expander, and a product is prepared. The modified hot melt adhesive adopts the EAA with low AA content, the EAA-graft-MAH grafting ratio is enabled to be higher and the MAH residue quantity is enabled to be lower through initiator compounding, preparation of the fisheye-free hot melt adhesive film with high polarity and excellent heat resistance is facilitated; the heat resistance and the adhesion performance are balanced, and the preparation method has wider application prospect.

The invention relates to the field of adhesives, discloses a glass fiber mesh cloth latex and a preparation method thereof, which solves the problem that the bonding strength between the existing latex coating and glass fiber is reduced and is easy to peel off, and the main point of the technical solution is a glass fiber Mesh cloth latex is polymerized by seed emulsion, including seed latex, oil phase liquid, water phase liquid, initiator solution, soft water, etc., wherein the raw material oil phase liquid used to form the shell structure contains siloxane, and the oil phase The liquid is added completely in the seed emulsion polymerization at one time, so that the obtained shell structure is mixed with a high concentration of siloxane, and the silicon-oxygen bond in the siloxane can react with the free hydroxyl groups on the surface of the glass fiber to improve the adhesion between the coating and the surface of the glass fiber. Adhesion, bond strength and improved coating blocking resistance, further reducing the possibility of coating peeling from the glass fiber.

The invention belongs to the field of polyolefins, and relates to a polarized isobutylene-based polymer and a preparation method thereof. The polarized isobutene-based polymer is an isobutene-based polymer connected with multiple polyvinyl chloride segments, the content of the isobutene-based polymer is 26-80 wt%, and the weight-average weight of the polarized isobutene-based polymer is The molecular weight is 105-800kg / mol, and the molecular weight distribution index is 1.2-5.0. The present invention realizes the graft copolymerization of isobutylene on polyvinyl chloride in a relatively large grafting amount range, and obtains a copolymerization product with a high grafting amount, which not only improves the polarity of the isobutylene-based polymer material, but also improves the polyvinyl chloride. The processability of vinyl chloride, more importantly, can be used to increase the blending compatibility of the two polymers, greatly improving the mechanical properties of the blend and other properties.