174results about How to "High tear performance" patented technology

An oilfield ultrahigh-pressure acid-resistant rubber seal material comprises, by weight, 85-65 parts of hydrogenated butadiene-acrylonitrile rubber, 15-35 parts of butadiene-acrylonitrile rubber, 5-7 parts of zinc oxide, 1-4 parts of stearic acid, 1-2 parts of an antioxidant, 50-65 parts of nanometer carbon black, 15-25 parts of white carbon black, 5-10 parts of a phenolic resin, 5-10 parts of a softener, 3-6 parts of a peroxide vulcanizing agent, 6-8 parts of a vulcanizing aid, 1-3 parts of sulfur, and 2-4 parts of a promoter, wherein the sum of the weight parts of the hydrogenated butadiene-acrylonitrile rubber and the butadiene-acrylonitrile rubber is 100. A seal ring made through adopting the rubber seal material can satisfy the seal of oilfield high-pressure acid-resistant liquid (hydrochloric acid or hydrofluoric acid) pipelines, and overcomes the leakage and torn edge extrusion phenomena of seal members under a high hydraulic pressure.

The invention discloses a production technology of a medical fabric. The technology comprises the following steps of grey fabric weaving, desizing, drying, splashing and sizing, calendering treatment, and coating of a double-sided coating, wherein the calendered surface of the fabric is coated with a PU resin coating with water pressure resistance; the PU resin coating is divided into a PU polyether two-component base material and a PU one-component fabric for separate coating; after the calendered surface is coated, the fabric is dried through high-temperature oven until being rolled up, and the other side of the fabric is coated with an organic silicone coating, and high-temperature drying is carried out to obtain the medical fabric. The tissue style characteristics of the woven fabric are integrated, and coating finishing is carried out on the front and reverse sides of the fabric, so that the fabric has the characteristics of being waterproof, easy to decontaminate and high in tenacity, and the production technology is suitable for the medical fabric.

An embossing and casting film with high intensity and low gram weight consists of a first flexible outer layer and a second flexible outer layer; wherein, a rigid bracing layer is arranged between the first flexible outer layer and the second flexible outer layer, and is respectively connected with the first flexible outer layer and the second flexible outer layer in an attaching way. The thickness of the rigid bracing layer is 1.3-1.8 times of that of the first flexible outer layer or the second flexible outer layer. The method for manufacturing the embossing and casting film with high intensity and low gram weight comprises the steps that a three-layer co-extrusion casting machine is used for extruding polyethylene material according to the structure of the first flexible outer layer-the rigid bracing layer-the second flexible outer layer. The invention promotes the intensity and the tenacity of the casting film with low gram weight by utilizing the flexible outer layers, provides good hand feeling, enhances the effects of heat seal and printing with other materials, and improves the stiffness and the rigidity of the casting film with low gram weight by utilizing the rigid bracing layer. Therefore, the technical problems of poor mechanical intensity and easiness producing of crease of the casting film with low gram weight in the prior art are solved.

The invention discloses an aluminium hydroxide flame retardant adhesive and a preparation method thereof, and belongs to the field of flame retardant materials. The aluminium hydroxide flame retardant adhesive comprises the following components in parts by mass: 40 parts of a chloroprene rubber adhesive, 60 parts of natural rubber, 2 to 5 parts of an anti-aging agent RD, 7 to 15 parts of phenolic resin 12687, 1 to 6 parts of stearic acid, 4 to 10 parts of magnesium oxide, 10 to 30 parts of argil, 10 to 30 parts of carbon black, 20 to 25 parts of aluminium hydroxide, 8 to 14 parts of paraffin oil, 1 to 3 parts of an accelerant M, 1 to 3 parts of an accelerant DM, and 2 to 4 parts of sulphur. Aluminium hydroxide is processed in a plastication starting stage by using a two-stage plastication way. The aluminium hydroxide flame retardant adhesive provided by the invention has a good flame retardant efficiency, the escape of combustible gases can be prevented by using aluminium hydroxide, the formation of soot is avoided, a better flame retardant and smoke suppression effect is played, the tensile strength is high, the stretch rate is good, the production process is simple, and the manufacturing cost and the manufacturing difficulty are lowered.

An envelope comprising a tear strip that functions as an efficient opening means for access to the envelope contents.

The invention relates to a high-strength high-breathability polrvinyl chloride preservative film which comprises the following components in parts by weight: 100 parts of PVC resin (SG-4 type), 4-6 parts of calcium-zinc compound stabilizing agent, 0.5-1 part of stearic acid, 25-30 parts of dioctyl phthalate (DOP), 20-25 parts of 1,2-propylene glycol adipate, 2-5 parts of nano scale silicon dioxide (SiO2), 1-3 parts of silane coupling agent, 2-5 parts of nano scale calcium carbonate (CaCO3) and 1-3 parts of titanate coupling agent. The components are prepared into a film with a certain thickness through the working procedures of mediating, extruding, blow molding, and the like, and the film is used for retaining the freshness of agricultural products. The preservative film has the main technical characteristics that the tensile strength and the elongation at break of the preservative film are 10-30 percent higher than that of ordinary preservative films, the breathability rate is improved by 10-20 percent, and the preservative film has better packability to the agricultural products and good breathability and can effectively prevent frosting.

The invention relates to agricultural machinery, in particular to a peeling mechanism for removing bracteal leaves from fresh corn ears, in particular to a device for efficiently peeling corn ears at a low smashing rate. The device comprises a feeding hopper, a discharging hopper, a transmission system and a frame, wherein the frame is provided with an engine base; the engine base is provided with a peeling roller device; the peeling roller device comprises at least two pairs of peeling rollers which are meshed in parallel with each other; the peeling rollers consist of fixed peeling rollers and floating peeling rollers; the surface of each fixed peeling roller is provided with metal strip-shaped spiral bumps and inverted V-shaped bracteal leaf cutting teeth; the floating peeling roller close to one side of the feeding hopper is provided with rasp bar-shaped peeling teeth; and the other side is provided with rubber trapezoidal peeling teeth. The device is particularly suitable for fresh corns (such as fruit corns, waxy corns and sweet corns) with high moisture and tight bracteal leaves, fodder corns, corn seeds and the like, and has a good peeling effect, high efficiency and low smashing rate.

The invention relates to a foamed shoe sole material and a preparation method thereof. The shoe sole material comprises, by weight, 100 parts of rubber body, 35-45 parts of filler, 25-35 parts of operating oil, 1-4 parts of accelerant, 0.5-1 part of stearic acid, 3-7 parts of zinc oxide, 25-50 parts of white carbon black, 20-30 parts of modified kaolin, 2-5 parts of silane coupling agent, 1-5 parts of inorganic nano crystal whisker, 0.5-3 parts of 4,4-oxybis(benzenesulfonyl hydrazide), 0.3-1.5 parts of paraffin, 5-8 parts of polyethylene glycol, 1-3 parts of styrenated phenol, 1-3 parts of phenolic resin and 1.5-4 parts of sulfur. The foamed shoe sole material has more uniform foaming holes, the weight of a shoe sole is reduced, and meanwhile, the shoe sole material has relatively high wear resistance. The foamed shoe sole material is high in abrasion and light, and can be conveniently used for preparing mountaineering shoe soles and tennis shoe soles.

The invention relates to a method for improving the strength of wastepaper fibers based on nanometer microcrystalline cellulose. The method comprises the following steps: preparing the nanometer microcrystalline cellulose and a wastepaper pulp; taking a certain amount of the pulp, adding a proper amount of water, sequentially adding calcium carbonate, a cationic polyacrylamide solution and a nanometer microcrystalline cellulose suspension, and defibering in a GBJ-A fiber standard dissociator; shaping the defibered pulp in the shaping position of a ZQJ1-B-II paper handsheet former to obtain wet paper; and transferring the wet paper to a position between two dry cloths, carrying out a squeezing technology to remove a certain amount of water, and carrying out vacuum drying at 105DEG C for 15min to obtain dry paper. The method has the advantages of simple process, no need of arrangement of any devices, and easy operation control, and is of great guiding significance to efficient application of wastepaper fibers and enterprise production adopting wastepaper as a raw material.

The invention discloses a high-performance natural rubber/styrene-butadiene rubber composite material. The raw materials include: natural rubber, styrene-butadiene rubber, rare-earth isoprene rubber, zinc oxide, stearic acid, sulfur, benzoyl peroxide, and an accelerator CZ, accelerator DM, accelerator NOBS, antioxidant, light calcium carbonate, magnesium oxide, calcium hydroxide, graphene oxide, bamboo charcoal powder, aluminum silicate, diatomaceous earth, sodium montmorillonite, benzyl triphenyl Phosphorous chloride, polyethylene glycol. The high-performance natural rubber/styrene-butadiene rubber composite material proposed by the invention has high strength, good heat resistance and wear resistance, can meet the use requirements of various fields, and has a long service life.

The invention belongs to the field of organic silicon materials, and particularly relates to blended rubber of silicone rubber and ethylene propylene diene monomer, and a preparation method thereof. The blend rubber of the silicone rubber and the ethylene propylene diene monomer is prepared from the following raw materials: raw methyl vinyl silicone rubber, raw ethylene propylene diene monomer, fumed silica, hydroxyl silicone oil, hexamethyl disilazane, dimethyldimethoxysilane, a silane coupling agent, methyl-terminated hydrogen-containing silicone oil, distilled water, zinc oxide, cerium oxide, calcium stearate, an accelerator, dicumyl peroxide, sulfur and auxiliary cross-linking agent. The silicone rubber and the ethylene propylene diene monomer in the blend rubber are good in compatibility, and the blend rubber has good mechanical properties and certain aging resistance.

The present invention relates to improved compositions of SSBR rubber. The improved compositions exhibit sufficient or improved balance of characteristics such as rolling resistance, HBU, abrasion, grip, and/or tear. The compositions may be made in an efficient, cost-effective manner.

The invention belongs to the field of rubber and plastic filler and particularly relates to polystyrene/silicon dioxide organic-inorganic hybrid Janus nano-particles grafted with polymers on the surface by utilizing a plurality of chemical reactions as well as a preparation method and an application thereof. According to the preparation method of the hybrid Janus nano-particles obtained through polymer grafting modification, the single spherical surface or dual spherical surfaces of the Janus nano-particles comprising polystyrene spheres and silicon dioxide spheres which are connected through chemical bonds are grafted with the polymers, wherein the dual spherical surfaces are grafted with the same or different polymers; after a rubber material is filled with the polystyrene/silicon dioxide organic-inorganic hybrid Janus nano-particles grafted with polymers, the dispersity is good, the stress at definite elongation and the general storage modulus of the rubber material are increased, the abrasive resistance, tearing resistance, strength and elongation at break are all obviously improved. Especially for different rubber blended systems, the Janus nano-particles grafted with different rubber molecules can remarkably improve the mixing effect of different rubbers, so that the general property of multi-element rubber can be given a full play.