44results about How to "Does not affect physical and mechanical properties" patented technology

The invention relates to a liquid silicon rubber composition which comprises the following components in parts by mass: 100 parts of polydimethylsiloxane with vinyl as an end group, 1-400 parts of inorganic reinforcing agent, 1-20 parts of low-viscosity polydimethylsiloxane with a vinyl-containing side group, 0.01-10 parts of cross-linking agent, 1-30 parts of polydimethylsiloxane with hydroxyl as an end group, and a platinum catalyst capable of curing the liquid silicon rubber composition. The invention further relates to a preparation method of the liquid silicon rubber composition. The liquid silicon rubber composition has low viscosity and good fluidity before being cured and is applicable to injection molding; and the composition has excellent resilience and low compression deformation ratio after being cured. The liquid silicon rubber composition can be applied to an elastomer, a pressure roll and an image heating and fixing device in a copier and a laser printer as well as certain silicon rubber products in need of the properties.

The invention discloses a thermoplastic low-smoke halogen-free flame-retardant environment-friendly sheath material for power cables and a preparation method thereof. The thermoplastic low-smoke halogen-free flame-retardant environment-friendly sheath material for power cables comprises the following components in parts by weight: 60-80 parts of EVA (ethylene-vinyl acetate), 20-30 parts of HDPE (high-density polyethylene), 10-15 parts of EPDM (ethylene-propylene-diene monomer), 15-25 parts of compatiblizing agent, 100-150 parts of halogen-free flame retardant, 0.5-1 part of antioxidant 1035, 0.5-1 part of antioxidant DSTP, 1-2 parts of ethylene bis stearamide, 3-5 parts of DCP (dicumyl peroxide), 2-4 parts of zinc oxide, 1-2 parts of calcium stearate, 10-20 parts of dimethyl methyl phosphonate, 30-40 parts of nano kaolin, 2-3 parts of stearic acid and 0.5-1 part of isopropyl tri(dioctylpyrophosphate)titanate. The sheath material disclosed by the invention has the advantages of excellent physical and mechanical properties, excellent flame retardancy, favorable high/low temperature resistance, favorable oil resistance, favorable solvent resistance, favorable wear resistance, favorable ozone resistance, favorable aging resistance, high flexibility, crack resistance and the like, is very durable, environment-friendly and pollution-free, and can completely satisfy the requirements for modern power cables.

The invention relates to a seal ring rubber material and a mixing method thereof. The mixing method comprises the following steps: carrying out crude rubber laminating and roller covering: adding 1-1.5 parts of aflux-42 serving as a processing agent and 1.5-2 parts of TM-80 serving as a mould release agent into 100 parts of fluororubber serving as crude rubber; mixing the above components of the rubber material for about 1 minute at the roller temperature of 40-45 DEG C, and adding 4-6 parts of activated magnesia serving as an acceptor; evenly mixing, adding 30-40 parts of a reinforcing agent which contains aramid pulp fiber; evenly mixing once again, adding 1-1.5 parts of bisphenol AF serving as a vulcanizing agent and 1-0.5 part of tert-butyl peroxypivalate (BPP) serving as an accelerator; and finally adding 5-7 parts of calcium hydroxide, packaging into a cornucopla for three or four times after all compounding ingredients are consumed up under the roller temperature of below 55 DEG C, adjusting the roller distance to be less than 0.55mm, rolling the dropped rubber for five or six times, and discharging. The seal ring rubber material has the advantages of rapid vulcanization speed of fluororubber, high production efficiency and low rejection rate.

The invention discloses a formaldehyde eliminating agent and preparing method thereof. Weight proportioning of raw material for the formaldehyde eliminating agent is: 100-300 quotient of formaldehyde, 150-700 quotient of urea, 50-500 quotient of water, 10-80 quotient of accelerant, 0.1-5 quotient of stabilizer, and 1-20 quotient of catalyst. The preparing method includes steps: adding each component into reaction kettle in turn, stirring the mixture at temperature of 20-50 DEG C until equally mixed and whole dissolved, adjusting pH between 7.5-9.0, and stirring until stable. Advantages of the formaldehyde eliminating agent are: preparing cost is low, formaldehyde eliminating effect is evident and permanent when the formaldehyde eliminating agent is used with urea-formaldehyde resin glue or melamine modified urea-formaldehyde resin glue for synthetic plate of incompetent formaldehyde releasing amount and E2 level synthetic plate, making formaldehyde releasing amount of incompetent and E2 level middle/high density fiber board reach to E2 and E1 level separately and observably reducing preparing cost of the middle/high density fiber board without reducing mechanics capability of the synthetic plate.

The invention relates to a PBT (polybutylene terephthalate) enhanced flame-retardant laser printing material. The PBT enhanced flame-retardant laser printing material comprises the following raw materials: PBT resin, PBT laser powder, a flame retardant, an antioxidant, a flow aid, a demolding agent, 5%-8% of a toughening agent and glass fibers. The PBT enhanced flame-retardant laser printing material is prepared by the steps of feeding dried PBT into a double-screw extruder from the first section of a cylinder body, mixing the flame retardant, the PBT laser powder, the antioxidant, the flow aid, the demolding agent and the toughening agent by virtue of a high-speed mixer, adding the mixture into the double-screw extruder from the fourth section of the cylinder body by virtue of a proportioning feeding machine, simultaneously adding the glass fibers, and after blending materials by virtue of the double-screw extruder, carrying out extruding, cooling, particle dicing and measurement packing. The PBT enhanced flame-retardant laser printing material can resist high temperature and can be used for printing white fonts on a black substrate by virtue of laser, and the fonts are clear.

The invention provides a mosquito-dispelling polyamide 6 fiber and a preparation method thereof. The preparation method comprises the following steps of: after adsorbing mosquito-dispelling ester to attapulgite, adding an additive and polyamide 6 resin; extruding in a double-screw extruder and granulating to prepare mosquito-dispelling polyamide 6 master batch, wherein the mosquito-dispelling polyamide master batch comprises the following materials in percentage by weight: 60-70 percent of fiber-scale polyamide 6 resin, 15-30 percent of attapulgite, 0.1-1 percent of antioxidant, 0.1-1 percent of light stabilizer 78300 and 5-15 percent of mosquito-dispelling ester, wherein the antioxidant is a composition of MD 697 and one of a hindered phenolic antioxidant, a phosphite ester antioxidant and thiodipropionate antioxidant; and performing blended spinning on polyamide 6 slices and the mosquito-dispelling polyamide 6 master batch according to the weight ratio of80-90:10-20 to prepare the mosquito-dispelling polyamide 6 fiber. The mosquito-dispelling polyamide 6 fiber has the advantages of lasting mosquito-dispelling effect, simple process, low cost, wide application and the like.

The invention discloses a mould-proof aerated building block and a making method thereof. The mould-proof aerated building block is made from, by weight, 17-29 parts of silicon micro-powder, 22-36 parts of fluorite slag, 9-16 parts of crab shell powder, 12-18 parts of sulfur slag, 5-10 parts of nanometer silver supported zirconium phosphate, 4-7 parts of polyacrylamide, 5-10 parts of traditional Chinese medicinal residue ash, 13-21 parts of slag micro-powder, 14-22 parts of porous ceramsite, 15-25 parts of white cement, 11-17 parts of calcined loess, 10-15 parts of quicklime, 1-2 parts of hydrogen peroxide and a proper amount of water. The crab shell powder, the sulfur slag, the nanometer silver supported zirconium phosphate, polyacrylamide, the traditional Chinese medicinal residue ash and other raw materials added in the invention can obviously improve the mould proofing performance of the aerated building block and have no influences on the physical-mechanical performances of the aerated building block. The aerated building block made in the invention has excellent mould proofing performance, has a bacteriostasis rate reaching 99.5% or above, and also has excellent impact, thermal ageing and corrosion resistance.

The invention belongs to the technical field of tires with special properties, and particularly relates to a snowfield tire sidewall rubber material composition and a preparation method. The snowfield tire sidewall rubber material composition is prepared from 20-30 parts of styrene-butadiene rubber, 40-60 parts of natural rubber, 20-30 parts of butadiene rubber, 30-50 parts of nanoscale sheet filler, 5-10 parts of white carbon black, 2-3 parts of zinc oxide, 4-10 parts of stearic acid, 4-5 parts of anti-ageing agent 4020, 2-4 parts of aromatic oil, 1.5-2.5 parts of sulfur, 0.5-1.2 parts of accelerant NS and 10-16 parts of tackifying resin. By means of the technical scheme, the ozone aging resistance and the flex crack resistance of rubber materials can be greatly improved without influencing the existing physical and mechanical properties of the rubber materials.

The invention discloses a hydrogenated pentablock styrene thermoplastic elastomer and a preparation method thereof. The hydrogenated pentablock styrene thermoplastic elastomer is prepared by hydrogenation of a styrene-b-butadiene-b-styrene-b-butadiene-b-styrene pentablock copolymer. The preparation method includes: conducting segmented polymerization by anionic polymerization process to obtain a styrene-b-butadiene-b-styrene-b-butadiene-b-styrene pentablock copolymer sol, and then performing hydrogenation. The hydrogenated pentablock styrene thermoplastic elastomer provided by the invention has high fluidity and small permanent deformation, and at the same time has good mechanical properties.

The invention provides a rubber sheet isolating agent. The rubber sheet isolating agent is prepared from the following raw materials in parts by weight: 30-50 parts of bentonite, 10-30 parts of silicafume, 10-30 parts of light calcium carbonate, 5-10 parts of zinc oxide, 3-5 parts of fumed silicon oxide, 13-30 parts of fatty acid derivative, 4-6 parts of a surfactant, 0.6-1 part of an organic silicone solid defoamer and 0.2-0.3 part of drier. According to the rubber sheet isolating agent, the isolation effect is outstanding, the stack sticking phenomenon of rubber materials is well controlled, and rubber sheets still has excellent isolation effect for being stacked more than one month; the rubber sheet isolating agent can be widely used in the isolation of different types of rubber sheets, so that the rubber sheets do not bond with one another, and various properties of rubber can be maintained; and the manufacturing process is simple, use amount is low, the isolation ability is high,and the rubber sheet isolating agent is especially suitable for isolation of high-viscosity rubber sheets such as bromobutyl rubber.

The invention discloses a coating method of a modified coating for improving coating weight. The coating method comprises the following steps: preparing a fibroin solution with the solid content of 36.2g.L<-1> by taking silk fiber as a material and adopting a ternary system containing calcium chloride, ethanol and water to dissolve fibroin; mixing the fibroin solution with a formaldehyde-free crosslinking agent at first, then adding a waterborne coating adhesive, adding a polyurethane thickener, stirring for dispersion, coating a polyester fabric, controlling the coating amount, baking at 150 DEG C for 2 minutes, and detecting the moisture permeability, water resistance and physical and mechanical properties of a coated fabric, wherein 10g of the waterborne coating adhesive is added, the used amount of the fibroin solution is 3% of the mass of the waterborne coating adhesive, and the used amount of the formaldehyde-free crosslinking agent is 3% of the mass of the waterborne coating adhesive. Compared with the prior art, by adopting the coating method disclosed by the invention, the water resistance and moisture permeability of the coated fabric are balanced, and the physical and mechanical properties of the coated fabric are not influenced.

The invention discloses a modification method of polyvinyl alcohol fiber for a strain-hardening cement-based composite material. According to the method, the surface of the polyvinyl alcohol fiber asa raw material is coated with a layer of interface epoxy resin, and the surface of an epoxy resin coating is coated with a layer of nano graphite powder. By means of the method, the interfacial properties of the polyvinyl alcohol fiber and a cement matrix can be well regulated, the stability of the coating can be guaranteed, and no damage can be caused to the fiber.

The invention discloses a method for improving the moisture penetrability and the water repellency of a coated fabric. The method comprises the following steps: using silk fiber as a material, dissolving silk fibroin in a calcium chloride-ethanol-water ternary system according to the molar ratio of 1:2:8 to prepare a silk fibroin solution of which the solid content is 36.2 g.L<-1>; using 10 g of a water-based coating adhesive, the silk fibroin solution which is 3 percent by mass of the water-based coating adhesive and a formaldehyde-free cross-linking agent which is 0-7 percent by mass of the water-based coating adhesive, mixing the silk fibroin solution and the formaldehyde-free cross-linking agent first, then adding the water-based coating adhesive, adding a polyurethane thickener, stirring and dispersing the mixture, coating a polyester fabric subjected to water repellent finish, and detecting the moisture penetrability, the water repellency and the physical and mechanical properties of the coated fabric. The method provided by the invention is simple and easy; the obtained modified coating adhesive greatly improves the moisture penetrability of the coated fabric while maintaining the water repellency of the coated fabric, and doesn't influence the physical and mechanical properties of the coated fabric.

The invention discloses a non-mechanical scabbling process for treating a continuous end of a prestressed concrete beam slab by using a super retarder, and relates to the field of concrete construction methods. The method specifically comprises the following steps that S1, a beam plate continuous end mold is cleaned; S2, a retarder is brushed; and S3, after beam body concrete pouring is completed,the mold is removed, and scabbling is completed. The problem that in the common manual scabbling process, the quality of the concrete continuous end scabbling quality is difficult to control due to the difference of workers is solved; and the problems that in the common manual scabbling process, time and labor are wasted, noise and dust pollution is large, the difference of the scabbling qualityof the concrete continuous end is large due to different proficiency degrees and responsibilities of workers, and quality control is difficult are solved.

The invention belongs to the aeronautical material manufacturing technique and relates to a method for improving the fungus-proof performance of a rubber material. The method for improving the fungus-proof performance of the rubber material comprises the steps that 1, master refining of raw rubber is conducted, wherein filler and additives are added into the raw rubber, then master refining is conducted for 35-45 minutes, and the additives include a plasticizer and an anti-aging agent; 2, filtering is conducted, wherein fine filtration is conducted on the refined raw rubber with two layers of screens with meshes ranging from 80 to 100; 3, mixing is conducted, wherein mixing is conducted for 20-25 minutes at the temperature ranging from 40 DEG C to 55 DEG C after a mildew preventive and a vulcanizing agent are added to the filtered raw rubber according to the different types of the rubber, and the roller interval for mixing ranges from 2 mm to 2.5 mm, and the mildew preventive is the mildew preventive O or the mildew preventive BCM. By the adoption of the method, the fungus-proof performance of the rubber material can be improved remarkably, and meanwhile the physical and mechanical performance of the rubber material is not affected.

The invention provides a radiation-resistant additive and synthesis thereof, and a method for preparing a radiation-resistant silicone rubber material, wherein the structure formula of the radiation-resistant additive is as follows, and mixing vulcanizing is performed by using the radiation-resistant additive as a radiation-resistant additive, using phenyl silicone rubber as a base rubber and adding a reinforcement agent, a structure control agent and a vulcanizing agent to prepare the radiation-resistant silicone rubber material. According to the present invention, the prepared radiation-resistant silicone rubber material has good radiation resistance, can be used for producing various kinds of rubber products such as electric wires, cable sheaths, rubber gaskets, sealing parts, member sheets and the like in various irradiation occasions, and can be widely used in aerospace, nuclear industry, electronic communications, chemical industry, medicine, marine and other fields requiring high-energy radiation.