120results about How to "Improve the effect of grafting" patented technology

A wood-plastics shuttering board for building engineering is composed of at least two basic wood-plastic ply layers made of the filler (vegetative fibers, glass fibers and plastics) and assistant (calcium carbonate, modifier, coupling agent and lubricant), and at least one lattice material layer between two basic wood-plastic ply layers and with two adhesive layers coated on its both surfaces. Its manufacture technology is also disclosed.

The invention discloses a high-viscosity modified asphalt material. The asphalt material is prepared from the following raw materials in parts by mass: 100 parts of matrix asphalt, 4-7 parts of a thermoplastic elastomer, 4-10 parts of waste rubber powder or an ethylene-vinyl acetate copolymer, 1-3 parts of a plasticizer, 2-4 parts of thermoplastic resin, 3-5 parts of a solubilizer, 0.2-2 parts ofa stabilizer, 0.5-1.5 parts of a chemical modifier and 0.2-0.7 part of polypropylene glycol. Through the high-viscosity modified asphalt material, the storage stability of high-viscosity modified asphalt is improved; meanwhile, high-temperature viscosity of the high-viscosity modified asphalt is reduced; when the high-viscosity modified asphalt material is applied to mixing of asphalt mixture, themixing temperature is low; the high-viscosity modified asphalt material is easy to construct, low in cost and simple in preparation method.

The invention belongs to the technical field of glass surface modification, and relates to a glass surface grafting method, especially to a method for grafting polymer chains on the surface of glass through free radical polymerization initiated by redox. According to the invention, glass flake processed by a silane coupling agent is added into a monomer aqueous solution containing a few CuSO4 to react for 3-4 hours at the temperature of 80 DEG C, so as to obtain a glass flake sample with the polymer chains being fixed on the surface. The operation technology provided by the invention is simple; the grafting effect is obvious; raw materials used are products sold in the market, can be used without complex purification process, and are low in price and easily available; water is used as a reaction medium, thus avoiding complex solvent recovery process in the later period, reducing cost and minimizing the pollution to the environment; and grafted sheet glass or glass fiber products can be applied to reinforce the bond property between resins and glass in composite materials, and has an extensive industrial application prospect.

The invention discloses a grafting reaction device and a use method thereof. The grafting reaction device comprises a weightlessness feeding device, a single-screw melting device, an aid adding device, a twin-screw grafting reaction device and a vacuum devolatilization device. The use method comprises steps as follows: 1) a premix is added to the single-screw melting device by the weightlessness feeding device; 2) the single-screw melting device plasticizes and melts the premix into polymer melt and introduces the polymer melt into the twin-screw grafting reaction device; 3) the aid adding device adds aids to one or two heating zones of the twin-screw grafting reaction device; a graft polymer is formed through a grafting reaction in the twin-screw grafting reaction device and then introduced into the vacuum devolatilization device; 4) a solvent and non-reacted grafting aids are removed from the vacuum devolatilization device, and a finished product is obtained. The reaction device can effectively reduce crosslinked byproducts in the melting graft process of the polymer.

The present invention relates to the preparation method for composite modified corn starch emulsion, which belongs to the adhesive technology field. The raw materials comprise 25 to 35 shares of corn starch, 65 to 75 shares of inorganic acid, 0.5 to 1.3 shares of peroxide initiator, and 5 to 7 weight shares of copolymerization monomer. The corn starch is acid-splitted and oxidized to generate relatively-low viscosity primary acidolysis oxidation corn starch emulsion with a certain degree of oxidation. Then the acidolysis oxidation corn starch emulsion and the acrylamide experiences graft copolymerization to generate composite modified corn starch emulsion. Compared with the raw materials used in the tradition method, such as the synthetic resin waterborne polymer- isocyanate wood adhesive and the environmentally-friendly urea-formaldehyde resin adhesive, natural macromolecule material corn starch is used to replace the synthetic resin, significantly reducing the cost and truly realizing the green wood adhesive. The present invention has the advantages of unique design, standardized process, easy operation, easily-obtained equipment, no pollution, easy implementation, low cost and so on. After promotion, the present invention can be of enormous environmental benefits as well as social and economic benefits.

The invention discloses a high-efficient sewage purification material. The material comprises, by mass, 100 parts of modified straw fiber, 15-30 parts of modified bentonite, 5-12 parts of nano filler,5-16 parts of activated carbon and 10-28 parts of polyving akohol. According to the high-efficient sewage purification material, the modified straw fiber which is adopted as a main body, polyving akohol which is mainly adopted as an adhesive and a compatilizer, the composite nano filler, the modified bentonite and the activated carbon are used for preparing the purification material; the nano filler and the activated carbon are inorganic materials. According to the high-efficient sewage purification material, a water purification material is obtained through organic-inorganic composite preparation, and the water purification material is mainly used for purifying heavy metals in water; the modified straw fiber is adopted as a matrix, combined with the water purification material to obtaina high-tech water purification material, and the high-efficiency sewage purification material is more environmentally friendly.

The invention discloses a screw and charging barrel structure for a strong-shearing-force chemical reactor. According to the structure, a strong shearing section is communicated with the back end surface of a melting section, and a screw in the strong shearing section rotates in a charging barrel to form a strong shearing and conveying structure; screw edges of the screw in the strong shearing section and screw grooves in the charging barrel adopt a combined structure of a screw structure and a linear structure; the thread number of both the screw edges of the screw and the screw grooves in the charging barrel is 5; the rise angles of the screw edges of the screw and the screw grooves in the charging barrel are 40 degrees; when the width of the screw edges of the screw and the screw grooves in the charging barrel is 10, the height of the screw edges of the screw is 4.5 mm, and the depth of the screw grooves in the charging barrel is 2 mm; the rotating directions of the screw edges of the screw and the screw grooves in the charging barrel are opposite. The screw edges of the screw in the strong shearing section and the screw grooves in the charging barrel adopt a screw and linear combined structure, so that the shearing performance of the chemical reactor on molten state high polymer material is improved by 100%.

The invention relates to an antibacterial treatment method for a natural silk fabric surface. The method includes: adopting silicon dioxide loaded nano-silver as an antibacterial agent, leaving it and a coupling agent to undergo a high temperature reaction, and then letting the reaction product react with a silk fabric. The method employs a chemical grafting method to link the antibacterial agent with a silk fiber surface by the coupling agent so as to form a washable antibacterial functional layer. SEM analysis show that the antibacterial layer on the natural silk fabric surface is uniform, and the grafting effect is good.

The invention provides a preparation method of polypropylene/polystyrene alloy. The preparation method comprises the following steps: 1, weighing, by weight, 50-90 parts of polypropylene, 10-50 parts of polystyrene, 1-5 parts of acrylate monomers with polyfunctional groups, 0.1-0.5 part of antioxygen and 0.01-0.5 part of initiating agent; 2, adding the acrylate monomers with polyfunctional groups, the antioxygen and the initiating agent into organic solvent, conducting premixing, obtaining a premixed solution, and then mixing the premixed solution, the polypropylene and the polystyrene for obtaining a mixture; 3, adding the mixture into a screw extruder, introducing supercritical carbon dioxide at 1/5-1/3 position of a screw of the screw extruder, conducting melt extrusion, and obtaining the polypropylene/polystyrene alloy. According to the method, the supercritical carbon dioxide is introduced into the screw, the reaction temperature is lowered substantially, the reaction capacity between the polypropylene and the polystyrene is improved greatly, more polypropylene grafted polystyrene is formed in situ, and therefore the consistency between the polypropylene and polystyrene is improved remarkably. The invention further provides the polypropylene/polystyrene alloy.

The invention relates to a novel composite glycosylation modifying method. Casein and carboxymethyl chitosan are used as raw materials, and a copolymer high in grafting degree and good in heat stability is prepared, is applied to encapsulating of EGCG, and aims to improve the stability and slow release properties of EGCG. The specific method comprises the following steps of firstly performing polysaccharide graft modification on casein by a microwave wet method, then performing dry-method modification on primary wet-method products to obtain glycosylation products of which the grafting rate is80.5%, and loading and encapsulating the EGCG by a homogenizing method to obtain a ternary compound. The largest encapsulating rate of the compound on the EGCG is 79.68%, the reducing rate of resisting oxidation of the EGCG can be notably delayed during heat treatment and shelf life, the EGCG is slowly released in intestine and stomach liquid, the phenomenon of sudden release is effectively avoided, and the novel composite glycosylation modifying method can be widely applied to trade of foods, health-care products and the like.

A nylon plastics toughening agent comprises ethylene propylene diene methylene (EPDM), compatilizer 1, compatilizer 2 and initiator. The toughening agent is characterized in that the proportion of each component is as follows: 99,050 to 100,050g of EPDM, 1,899 to 901g of compatilizer, 2,319 to 321g of compatilizer and 29 to 31g of initiator. The manufacturing technique of the toughening agent is as follows: the weight of each component is measured; other components except EPDM are placed in a container so as to be dissolved through stirring; the obtained mixture and EPDM are mixed and stirred at a high speed to obtain a blend; the blend is fed into an extruder after deposited for one minute so as to carry out extruding reaction; meanwhile, pressure and the temperature of each temperature zone are controlled to obtain a linear toughening agent; then, the nylon plastics toughening agent is obtained through cooling, granulating and packaging. The nylon plastics toughening agent is specially developed for toughening nylon products, and has excellent graft effect; moreover, the toughening agent can greatly improve the compatibility, the interface affinity and the mechanical property of nylon plastics.

The invention relates to the technical field of a reverse osmosis membrane, and in particular relates to a biological pollution-resistant reverse osmosis membrane and a preparation method thereof. The biological pollution-resistant reverse osmosis membrane comprises a supporting membrane layer, and an anti-pollution membrane layer and a compact membrane layer which are successively combined outwards from one surface of the supporting membrane layer; and the anti-pollution membrane layer is formed by lignin grafted by ferulic acid. The biological pollution-resistant reverse osmosis membrane can effectively inhibit the growth of microorganisms on the surface of the membrane, the biological pollution resistance of the membrane is improved, and the reverse osmosis membrane has no adverse influence on the health of the human body and the environment while still keeping high water flux and high desalting rate and can be widely applied to the field of water treatment.

The invention relates to a high-strength high-water-absorption degradable plugging agent and a preparation method thereof. The plugging agent is prepared from the following raw materials: an alkenyl monomer, a hydrophilic auxiliary agent, modified starch, a cross-linking agent, an initiator, an inorganic reinforcing agent, a degradation auxiliary agent and a degradation activator, wherein based onthe total mass of the raw materials, the content of the alkenyl monomer is 15-30%, the content of the hydrophilic additive is 10-30%, the content of the modified starch is 20-45%, the content of thecross-linking agent is 0.05-1.5%, the content of the initiator is 1.5-2%, and the content of the inorganic reinforcing agent is 2-5%. According to the invention, the high-strength high-water-absorption degradable plugging agent contains a plurality of hydrophilic groups, so that the plugging agent is high in water absorption rate and elasticity, is flexible gel, has deformability, can be squeezedinto a leakage channel to be compacted, is high in pressure bearing strength, contains high-temperature-resistant alpha-amylase, is subjected to degradation reaction at high temperature to destroy a plugging agent framework, is slowly liquefied, is free of residues and is free of pollution to stratums.

The invention discloses a natural plant fiber modifying agent. The natural plant fiber modifying agent comprises, by weight, 2-5 parts of surfactant, 5-10 parts of bridging agent and 780-800 parts of solvent. A surface modifying method of natural plant fibers comprises the following steps that firstly, the natural plant fibers are soaked into a cleaning agent to be cleaned to remove impurities, water is used for cleaning, and drying is conducted; secondly, the natural plant fibers dried in the first step are soaked into the natural plant fiber modifying agent and bathed in water for 10-20 min at the temperature of 70-90 DEG C, the natural plant fibers are taken out, standing and natural drying are conducted, and surface-modified natural plant fibers are obtained. According to natural plant fiber strengthened polymer composite materials processed through the natural plant fiber modifying agent and the modifying method, the tensile strength is increased by more than 20%, and the impact strength is increased by more than 15%.

The invention discloses a fishing net thread use quality improvement processing process. The process includes steps: (1) cleaning and deoiling treatment; (2) phosphoric acid solution soaking treatment; (3) treating fluid A soaking treatment; (4) ultraviolet irradiation treatment; (5) treating fluid B soaking treatment; (6) flushing and drying treatment. By special processing of fishing net threads, under joint actions in each step, the grafting effect of the fishing net threads is evidently improved, utilization characteristics of the fishing net threads are improved, and the finally treaded fishing net threads are high in coating compatibility, corrosion resistance, strength and comprehensive quality, thereby being high in popularization and utilization value.

The invention discloses a scratch-resistant PP plastic and a preparation method thereof, the scratch-resistant PP plastic is obtained by co-extrusion granulation of a composite filler and polypropylene resin, and the composite filler is obtained by mixing a modified filler and carboxylated polypropylene micro wax powder according to a weight ratio, ball milling and drying. Carboxylated polypropylene micro wax powder is grafted on the surface of the modified filler, so that the dispersion effect of the modified filler in polypropylene and the combination effect of the modified filler and a polypropylene material are improved. In the preparation process of the modified filler, a compound of nano hydrotalcite and nano silicon dioxide is mixed with a nano graphene dispersion liquid, and then heating and ultrasonic reaction are performed, so that a layer of graphene is grafted and fixed on the surface of the compound of nano hydrotalcite and nano silicon dioxide, on one hand, the surface friction coefficient of the plastic is reduced, and on the other hand, hydrotalcite sheet layers and nano silicon dioxide exposed when the surface of the plastic is scratched can be reduced, and obviousscratches are avoided.

The invention relates to a method for initiating a graft polymer through ultraviolet induction on the surface of glass, belonging to the technical field of surface modification of the glass. The method comprises the following steps of: uniformly coating a prepared reaction solution on the surface of the glass treated by a silane coupling agent, and placing the glass in an ultraviolet light curing machine to irradiate the glass for 3min, thereby obtaining a sheet glass sample, the surface of which is fixed with a polymer chain. The method has the advantages that an operating technology is simple, the grafting effect is obvious, and raw materials used are commercially available, can be used without needing to be subjected to a complex purification process and are low in cost and easily obtained; graft polymerization is initiated through ultraviolet induction, the operation is simple, the reaction time is short, and the environmental pollution is low; and the method can be used for the reinforcement of adhesive property between resin in a reinforced material and the glass and the modification of the surface character of the glass and has wide industrial application prospect.

The invention discloses ethylene-vinyl acetate copolymer-polystyrene resin and a preparation method thereof. The method comprises the following steps of: pre-irradiating an ethylene-vinyl acetate copolymer with beta rays or gamma rays, adding the pre-irradiated ethylene-vinyl acetate copolymer, a functional monomer, a dispersant, an emulsifier, a nucleating agent and a homopolymerization inhibitor into a reactor, and undergoing a suspension graft polymerization reaction; and filtering a suspension grafting product, washing and drying to obtain the ethylene-vinyl acetate copolymer-polystyrene resin. The pre-irradiated ethylene-vinyl acetate copolymer is used for generating a large molecular peroxide for serving as an initiator, so that side reactions such as homopolymerization of a monomer caused by a small molecular initiator, crosslinking of the ethylene-vinyl acetate copolymer and the like are avoided; through the suspension graft polymerization reaction, the grafting rate mass percentage is up to 80.2 percent, and a good grafting effect is achieved; the grafting product has the technical properties of high strength, high flexibility and impact resistance; and the ethylene-vinyl acetate copolymer-polystyrene resin has the characteristics of an ethylene-vinyl acetate copolymer and polystyrene.