33results about How to "Inhibition of cross-linking reaction" patented technology

The embodiment of the invention discloses a method for preparing polypropylene melt with high melt strength, which uses alkadiene as a modified monomer, thus improving the tensile property of the polypropylene melt with high melt strength due to good compatibility of the alkadiene and polypropylene resin. In addition, the alkadiene monomers can perform grafting reaction with the polypropylene melt, and the alkadiene monomer has lower activity, thus inhibiting cross-linkage reaction so as to expedite the grafting reaction in a certain degree and ensure polypropylene to have higher melt strength. Therefore, the polypropylene melt with high melt strength prepared by the method provided by the invention not only has higher melt strength, but also has larger draw ratio and excellent melt ductility.

The invention provides a low viscosity PET protective film for a foaming body material. The low viscosity PET protective film for the foaming body material comprises a PET base material layer, a low viscosity middle layer and a protective layer, has the advantages of simple preparation process and easy operation and is suitable for industrial production. Firstly, a chain extender of a high-performance low viscosity glue is acidic, an acidic substance can inhibit formation reaction of biuret so as to inhibit cross-linking reaction, and therefore, the viscosity is reduced; and secondly, a catalyst is a mild acidic ion liquid, the catalytic activity of the catalyst is lower, the nucleophilic attack of the catalyst to isocyanate is effectively inhibited so as to reduce the activity of reactionof the isocyanate and macromolecular dihydric alcohol hydroxy, the catalyst has a better synergistic effect with an emulsifying agent, the viscosity of the product is reduced, and the storage and stability performances of the high-performance low viscosity glue are improved. Therefore, the low viscosity PET protective film for the foaming body material, provided by the invention, has the advantages of low viscosity, easy tearing, no residual glue, good conformability, good high temperature resistance and excellent mechanical property.

The invention discloses a high fatigue resistance nylon composite material for office seats and a preparation method thereof and belongs to the technical field of high molecular materials. The nylon composite material is prepared by utilizing polyamide, a chain extender, an additive and inorganic mineral powder modified by a silane coupling agent as raw materials and melting and extruding out by atwin-screw extruder. The method has the advantages of simpleness in operation and convenience in process; furthermore, the material has the excellent performance of excellent mechanical property, good appearance, low production cost and the like.

The invention belongs to the technical field of polymer synthesis, and more specifically relates to a preparation method of copolyester polyurethane. Using thiourea compounds and organic bases to form a composite catalytic system, using water or diols as chain transfer agents, under milder conditions to co-catalyze the copolymerization of acid anhydride monomers and epoxy monomers to prepare low-alternative structures. Molecular weight copolyester diol; the composite catalytic system further catalyzes the polyaddition reaction of low molecular weight copolyester diol and diisocyanate to synthesize copolyester polyurethane. The process is a "one pot, two steps" process. As a result, the traditional production process of polyester polyurethane can effectively solve the defects of cumbersome steps, time-consuming and laborious, difficult separation and purification, low yield, and high production cost.

The invented graft copolymer of maleic anhydride and ethylene-alpha-octylene is prepared as follows: ethylene-alpha-octylene copolymer, maleic anhydride peroxide type initiator and phosphite ester like compound are put in extruder ar internal mixer to proceed melt grafting reaction to obtain maleic anhydride graft ethylene-alpha-octylene copolymer. Said method is high in grafting rate, low in gel content.

The invention discloses a preparation method of natural rubber with constant viscosity which relates to the technique of mooney viscosity control of natural rubber. The method comprises the steps of adding the mercaptan compounds into the natural rubber, mixing evenly, and then performing the conventional processes of solidification, tabletting, prilling and drying. The natural rubber with constant viscosity of the invention has the storage hardening value of smaller than 2 represented by the Wallace initial plasticity, and has the storage hardening value of smaller than 5 represented by themooney viscosity, thereby significantly improving the processing characteristics.

The invention relates to a grafted polyphenylene ether resin and a preparation method thereof, and belongs to the field of a polyphenylene ether resin. In the prior art, the chains of the polyphenylene ether molecules are easy to cross-link, the monomer is easily subjected to homopolymerization, and the mechanical property of the grafted polyphenylene ether resin is poor. The purpose of the present invention is to solve the problems in the prior art. The preparation method comprises: adopting beta rays or gamma rays to carry out pre-irradiation on the polyphenylene ether resin; mixing the pre-irradiated polyphenylene ether resin and the polyphenylene ether resin, and adding the resulting mixture to a reaction type double screw extruder; adding a graft monomer and an electron donor from a liquid feeding port of the reaction type double screw extruder to carry out reactive extrusion grafting to obtain the grafted polyphenylene ether resin. The water contact angle of the grafted polyphenylene ether resin prepared by the method is in the range of 50.6-82.6 DEG C, and the tensile strength of the grafted polyphenylene ether resin / polyamide 6 blending alloy can be 71.4 Mpa.

The invention provides a high-performance low-viscosity preparation method for low-viscosity PET protective film. Macromolecular polyols are vacuum dehydrated at 100-120°C for 1-5h, and then cooled to 60-80°C; then adding isocyanate, organic Solvent and catalyst, react at constant temperature at 500-1500r / min for 2-6h; add chain extender for chain extension reaction for 1-5h, cool to 30-50°C; then add salt-forming agent and deionized water, at 1000-3000r Under the condition of high-speed shearing and dispersion for 0.5‑2h per minute, a high-performance low-viscosity adhesive is obtained. The preparation process is simple and easy to operate, and it is suitable for industrial production. And the high-performance low-viscosity adhesive produced by the method provided by the present invention is used in the PET protective film, so that the PET protective film has the characteristics of low viscosity, easy to tear off, no residual glue, good adhesion, good high temperature resistance and excellent mechanical properties .

The invention discloses a flame-retardant and fire-resistant cable insulation rubber for ships and a production method therefor. The raw materials are 20 parts of ethylene propylene diene monomer rubber 4045M, 0.5-0.6 part of vulcanizing agent DCP, 0.2-0.3 part of co-vulcanization agent TAC, 0.1-0.3 part of anti-aging agent MB, 0.1-0.3 part of anti-aging agent RD, 0.1-0.2 part of coupling agent A-172, 15-20 parts of aluminum hydroxide, 3-6 parts of ceramic glass powder, 1-1.5 parts of plasticizer No 1000 steam cylinder oil, 6-8 parts of fine talcum powder, 4-7 parts of reinforcing agent hydrated silica, and 5-8 parts of reinforcing agent calcined pottery clay. First, ethylene propylene diene monomer rubber 4045M is subjected to mixing for 1-1.5min, then the anti-aging agents, the coupling agent, aluminum hydroxide, the ceramic glass powder, the plasticizer, talcum powder and the reinforcing agents are added in order and after the above mixture is subjected to mixing for 7-8min, the mixture is unloaded and aired for above 24h; then the above rubber material is subjected to 2-3min, and the vulcanizing agent and the co-vulcanization agent are added in the last 20 seconds, the material after mixing is loaded in an open mill for thin-pass, after triangular packaging and square packaging are performed, sheets are obtained. The insulation rubber has simple production technology, low cost, small external diameter and light weight, is flexible and easy to bend, and is convenient for construction and installation.

The invention discloses a non-crosslinked EVA (ethylene-vinyl-acetate) rubber film for packaging thin-film solar cells, which is characterized in that the rubber film is prepared from the following raw materials in percentage by weight: 97.44-98.55% of ethylene-vinyl acetate copolymers, 1.0-1.5% of maleic anhydride, 0.2-0.5% of a silane coupling agent, 0.1-0.2% of a light stabilizer, 0.05-0.06% of dicumyl peroxide, and 0.1-0.3% of an antioxidant; and the vinyl acetate content of the ethylene-vinyl acetate copolymers is 5-15%. The invention also provides a manufacturing method of the non-crosslinked EVA rubber film for packaging thin-film solar cells. The non-crosslinked EVA rubber film for packaging thin-film solar cells disclosed by the invention is high in melting point, high in strength, low in liquidity and strong in cohesive force, and kept in a thermoplastic state; the continuous packaging production of thin-film solar cell modules can be realized by using a rolling process, therefore, the non-crosslinked EVA rubber film is high in packaging efficiency and low in cost.

The invention relates to resin for a dripping film, and a preparation method and application thereof, belonging to the technical field of agricultural materials. The objective of the invention is to overcome technical problems in preparation of dripping films with low cost and long dripping period. The resin for the dripping film in the invention is composed of, by weight, 81 to 95 parts of pre-irradiation polymer resin, 1 to 10 parts of grafted resin, 5 to 15 parts of functional monomers, 2 to 15 parts of a reverse graft, 1 to 5 parts of polyethylene-polystyrene resin and 2 to 3 parts of an electron-donating agent, wherein the weight parts of the pre-irradiation polymer resin, the grafted resin, the polyethylene-polystyrene resin and the reverse graft sum to 100. The invention further provides a preparation method for the resin and application of the resin as a dripping-film material. Results of an accelerated dripping experiment at 60 DEGC and an actual outdoor in-greenhouse experiment show that a dripping film prepared from the resin has a dripping period of 29 to 38 days and 12 to 14 months, respectively.

The application relates to the technical field of communication transmission equipment, and specifically discloses a high swing data line and a preparation method thereof. The high-swing data line includes a conductive wire core covered with a high-swing TPE material, and the high-swing TPE material is made of raw materials including the following parts by weight: 20-40 parts of SEBS elastomer, 10 parts of polypropylene ‑20 parts, 5‑10 parts of calcium carbonate, 5‑10 parts of maleic anhydride, 2‑4 parts of grafting aid, 3‑5 parts of anti-wrinkle agent; its preparation method is: high swing TPE material is melt-extruded, and then Wrapped on the conductive wire core, weld the conductive wire core with the USB connector and the transmission connector, and then inject molding with high swing TPE material to obtain a high swing data cable. The high swing data line of the present application has good tensile strength, elongation at break and tear strength, and is not easy to crack; in addition, the preparation method of the present application is easy to operate, which helps to further reduce the breakage of the high swing data line.

The invention provides a low-viscosity PET protective film for foam materials, which is composed of a PET base material layer, a low-viscosity intermediate layer and a protective layer. The preparation process is simple and easy to operate, and it is suitable for industrial production. First, the high-performance low-viscosity chain extender is acidic, and the acidic substance can inhibit the formation reaction of biuret, thereby inhibiting the crosslinking reaction and reducing the viscosity; second, the catalyst is a mild acidic ionic liquid, and its catalytic activity is relatively low. Low, effectively inhibiting its nucleophilic attack on isocyanate, thereby reducing the activity of isocyanate reacting with macromolecular diol hydroxyl groups, and having a good synergistic effect with emulsifiers, reducing the viscosity of the product and improving high performance and low viscosity Glue storage stability. Therefore, the PET protective film provided by the present invention has the characteristics of low viscosity, easy to tear off, no glue residue, good adhesion, good high temperature resistance and excellent mechanical properties.