37results about How to "High tensile" patented technology

The invention provides a paper dry intensifier and a preparation method thereof. The preparation method comprises the following steps: in nitrogen atmosphere, reacting water, acrylamide, an anionic monomer, a cationic monomer, a cross-linked monomer, a chain transfer agent, other functional monomers and a photoinitiator under ultraviolet irradiation; adding a pH regulator for regulating the pH value to be 4-6; and adding a radical catcher, and mixing to obtain the paper dry intensifier. The intensifier synthesized by the method has the characteristics of low usage amount and good effect. The intensifier can be used in production of various paper such as case board paper, corrugating base paper, coated paper, cop tube paper, specialty paper and the like, and has the effect of improving the paper dry intensity, which is more remarkable when the recovered waste paper is used as papermaking raw materials. The intensifier can have an excellent paper dry enhancement effect without being added with aluminum sulfate.

The invention discloses a paper dry strength agent. Polyvinyl alcohol is etherified by a cationic etherifying agent to serve as a polymer emulsifier for preparation of a soap-free polymerization cross-linked polyacrylamide emulsion, which is used as a paper dry strength agent. The paper dry strength agent provided by the invention has the advantages of good strengthening effect, small loss in white water, good fixation, few jello, and environmental protection, etc. After being added into paper pulp, the dry strength agent can well improve the circumferential pressure, folding resistance, breakage resistance, tension, paper internal bonding strength and other performance of finished paper.

The invention discloses a branch type dry strength agent and a preparation method thereof. The preparation method comprises the following steps of: firstly, mixing acrylamide, negative ion monomers, positive ion monomers, crosslinking agent monomers, a photoinitiator, water and other functional monomers to obtain solution A; secondly, mixing a chain transfer agent and water to obtain solution B; thirdly, polymerizing 40%-60% of the solution A and 20%-40% of the solution B by ultraviolet ray irradiation; fourthly, adding 20%-30% of the solution A and 20%-30% of the solution B into the mixed solution in the third step to be subjected to polymerization by ultraviolet ray irradiation; fifthly, adding the residual solution A and the residual solution B into the mixed solution in the fourth step to be subjected to polymerization by ultraviolet ray irradiation until the viscosity of the solution meets requirements; and sixthly, adjusting the pH and solid content of weight of the mixed solution in the fifth step, and adding free radical catcher into the mixed solution to obtain the branch type dry strength agent. According to the branch type dry strength agent and the preparation method, the operation is simple, the viscosity is easy to control, the dispersibility of the branch type dry strength agent in water is good, the properties of ring crush, fold resistance, breaking resistance, tension resistance, internal bonding strength and the like of paper can be improved.

The invention relates to a ground calcium carbonate suspension production process. The ground calcium carbonate suspension production process comprises the following steps: providing a nano-crystalline cellulose solution of which the surface carboxyl content is 0.2-1.5mmol/g and the diameter is smaller than or equal to 100 nanometers; and providing calcium carbonate to be ground, preparing a mixed solution by taking the nano-crystalline cellulose solution as a dispersing agent according to a mixing proportion of adding 1-10kg by oven dry weight of the nano-crystalline cellulose solution into 1 ton of calcium carbonate, and grinding the mixed solution to obtain a ground calcium carbonate suspension. According to the ground calcium carbonate solution production process, the nano-crystalline cellulose solution of which the surface carboxyl content is 0.2-1.5mmol/g and the diameter is smaller than or equal to 100 nanometers is taken as the dispersing agent, instead of conventional sodium polyacrylate and salts thereof, so that the grain size of finished ground calcium carbonate meets the requirement, and damage to the skin and the respiratory tract of a person caused by a synthetic monomer in the preparation and use processes of polyacrylic acid and salts thereof is effectively avoided. The invention further relates to the ground calcium carbonate suspension and paper.

The invention discloses a high-temperature-resistant crack-resistant flame-retardant cable material which is prepared from the following raw materials in parts by weight: 50-70 parts of phenolic resin, 30-50 parts of high-density polyethylene, 30-50 parts of nano kaolin, 10-15 parts of nano crystalline cellulose, 3-4 parts of gamma-aminopropyltriethoxy silane, 40-50 parts of magnesium hydroxide, 1-3 parts of melamine cyanurate, 7-9 parts of microcapsulated red phosphorus, 15-30 parts of epoxy fatty acid methyl ester, 15-30 parts of epoxy soybean oil, 0.4-1 part of dicumyl peroxide, 0.5-1.5 parts of zinc oxide, 0.5-1.5 parts of 2-phenyl iminazole, 5-10 parts of maleic anhydride graft compatilizer, 2-3 parts of TX-1 rare-earth stabilizer, 2-3 parts of Ca/Zn composite stabilizer, 0.1-0.3 part of antioxidant 1010, 0.1-0.2 part of bisdodecanol thiodipropionate and 2-4 parts of silicone powder. The invention also discloses a preparation method of the high-temperature-resistant crack-resistant flame-retardant cable material.

A multi-layer thermal acoustical liner is breathable, hydrophobic, oliophobic and fire-resistant rated. The liner includes a central insulation core layer contacted on a first surface by a first highly breathable layer and on a second surface by a second highly breathable layer. The first and second highly breathable layers are preferably an ePTFE membrane. The first highly breathable layer is adjacent a facing layer while the second highly breathable layer is adjacent a backing layer. The backing and facing layers are preferably nylon and treated with a fluorocarbon surface treatment for water repellency, UV resistance and mold/mildew resistance. At least one surface of one of the first or second highly breathable layers may include a carbon printing pattern to provide ESD protection. The layers of the liner are laminated to one another.

An adhesive (B) of solvent containing adhesive as a suspension of low viscosity is prepared by adding a solvent MIBK to a one-part epoxy adhesive of a dicyandiamide-curable type (A). Metal shaped articles (M1 to M5) as adherends are prepared each of which, through various surface treatment, has specific surface configuration of roughened face and/or ultrafine irregularities and the surface is entirely covered with a thin layer of ceramics such as a metal oxide or metal phosphate. The specified face of each metal shaped article (M1 to M5) is painted with the solvent containing adhesive (B). The faces painted with the adhesive of two metal shaped articles (M1 to M5) are caused to abut each other, the articles are heated to cure the one-epoxy adhesive to accomplish adhesion. With one of the adherends replaced by a CFRP shaped article (P2), a composite of a metal and CFRP can be formed.

The aim of the invention is to provide a metal strip for epitaxial coating with a biaxially textured layer, this metal strip, however, being able to be produced in an uncomplicated manner and having a high tensile strength, low magnetic losses and/or a high electrical conductivity. According to the invention, the metal strip is comprised of Nj, Cu, Ag or alloys thereof all serving as basic material, whereby the one-layer metal strip and, in the instance of a multilayer metal strip, at least one of its layers contains 10 nm to 5 μm large, strength-increasing dispersoids comprised of carbides, borides, oxides and/or nitrides with a volume proportion ranging from 0.1 to 5%. In the instance of a multilayer metal strip, the layers form a composite, and at least one of the layers does not contain any dispersoids and has a biaxial texture. For the production, a starting material is used, which is comprised of Ni, Cu, Ag or of alloys thereof all serving as basic material and which contains 0.2 to 5 atom percent of an additive comprised of oxidizable, nitridable, bondable and/or carbidable elements. A one-layer or a multilayer strip is produced from this starting material by means of deforming methods, whereby for producing the multilayer metal strip, a basic material that does not contain the aforementioned additive is used as one of its layers. Afterwards, the strip is subjected to a recrystallization annealing in order to form a cubical texture. Finally, the strip is subjected to an annealing under an oxygen, nitrogen, boron or carbon partial pressure, which is greater than the equilibrium partial pressure of oxides, nitrides, borides and carbides of the additive elements contained in the alloy, but is less than the equilibrium partial pressure of oxides, nitrides, borides and carbides of the basic elements Ni, Cu and Ag of the strip alloy.

The invention relates to a synthetic method for preparing an environment-friendly papermaking sizing agent from gelatin extracted from waste leather scraps. According to the method, the gelatin is modified by adopting monomers capable of forming hydrogen bonds with the gelatin and polymers(such as acrylic acid, methacrylic acid, acrylamide, methacrylamide, N-hydroxymethyl acrylamide and the like)of the monomers; and blending and toughening with polymerization emulsion of an elastomer(such as ethyl acrylate, butyl acrylate, n-octyl acrylate, isooctyl acrylate, isooctyl methacrylate and dodecylmethacrylate)to obtain the papermaking sizing agent which is low in cost, simple in process and capable of greatly improving the water resistance and physical and mechanical properties of paper.

The invention discloses a leather production process. The leather production process comprises the following steps of (1), material selection, specifically, animal furs are selected, and the furs of the similar thickness are placed in the same drum to be processed; (2), immersion with liquid, specifically, a proper amount of leather immersion liquid is added into the drum in the above step, the furs are made to recover to the fresh fur state, and meanwhile sterilization and inoxidizability of the furs can be improved. The leather immersion liquid contains a leaching agent, a sterilizing agent, an antioxidant and a degreaser, when moisture enters the furs under the action of the leaching agent, the sterilizing agent and the antioxidant can be carried into the furs, the inoxidizability and sterilizing effect of the leather are improved, the degreaser can remove oil stains on the surface layers of the furs, convenience is brought to full-filling of a coating in a subsequent process, the moisture is controlled to be 15-30 degrees, the leaching effect of the leather immersion liquid at the temperature can be the optimal, and the inoxidizability and sterilizing effect of the leather are promoted.

The invention discloses an amphoteric dry strength agent for paper. By taking modified starch as a polymeric emulsifier, the starch is grafted to polyacrylamide chain macromolecules in the polymerization process to prepare a soap-free latent cross-linking type polyacrylamide emulsion as the dry strength agent for the paper. The amphoteric dry strength agent for the paper has the advantages of good strengthening effect, little loss of whitewater, good fixation, little jello, environmental protection and the like and can well improve the properties, including ring crush strength, folding strength, bursting strength, tensile strength and paper internal binding strength, of finished paper after paper pulp is added.

The invention relates to a formula of a water-based elastic fluorocarbon paint. The formula comprises 20-25% of water, 0.3-0.5% of a dispersant, 0.2-0.3% of a wetting agent, 0.3-0.5% of an antifoaming agent, 15-20% of rutile titanium dioxide powder, 15-20% of a filling material, 0.2-0.3% of a multifunctional auxiliary agent, 0.5-1% of a coalescing agent, 0.5-1% of glycol, 10-15% of a fluorocarbon emulsion, 20-30% of an elastic emulsion, 0.3-0.5% of a thickening agent and 0.1-0.3% of a leveling agent. Long straight chain and low branched chain of a high-molecular elastic cross-linking agent react with a fluorine-containing polymer to form a highly-straight-chain and low-branched-chain polymer, the structure of which is jagged. The ultimate embodiment of properties is reflected in appropriate surface strength, excellent elasticity, telescopic springback function, high tensile strength and fracture resistance, low surface polarity and strong resistance to soiling and weatherability.

The invention belongs to the technical field of communication cables and relates to a high-strength digital communication cable. The core wire group is made of 2 solid copper conductors covered with polyethylene insulation layer, and 1 to 8 pairs of core wire groups are twisted and then wrapped with a tape layer to form a circular cross-section cable core. Fill the gap between the stranded core wire group and the cladding layer with fillers, outside the cable core, cover the longitudinal cladding layer, braided shielding layer, inner sheath, armor layer and outer sheath in sequence from the inside to the outside. Layers make up high-strength digital communication cables. The present invention uses aramid fiber as filler, uses "S" shaped steel spiral interlocking armored armor layer, and the outer sheath is composed of polyurethane elastomer sheath + talc powder + radiation cross-linked polyvinyl chloride sheath The composite outer sheath makes the cable have higher tensile and compressive capabilities and better flexibility, and realizes the high-strength performance of digital communication cables. The invention is suitable for network wiring that is easy to be trampled on, squeezed, and has no protective environment such as pipes and wire slots.

The invention discloses an amphoteric dry strength agent and a preparation method thereof. The preparation method comprises the following steps: in a nitrogen atmosphere, the mixture of water, acrylamide, anionic monomer, cationic monomer, cross-link monomer, a chain transfer agent and other functional monomer and photoinitiator is subjected to ultraviolet irradiation reaction; pH regulator is added to adjust a pH value after the reaction is finished; and free radical catcher is added to obtain the product. The anionic monomer is the mixture of itaconate and sodium vinylsulfonate with the mass ratio of 1 to (3 to 5); the cationic monomer is the mixture of acrylic acid lignocaine ethyl ester and diallyl dimethyl ammonium chloride with the mass ratio of 1 to (2 to 3); and the functional monomer is the mixture of styrene and hydroxyethyl acrylate with the mass ratio of 1 to (1.5 to 3.5). The amphoteric dry strength agent has the characteristics of small dosage and good effect; particularly, when reclaimed waste paper pulp is adopted as papermaking raw material, the effect is more remarkable; and an excellent paper dry-strengthening effect is achieved under the condition that no aluminium sulphate is added.

The invention provides a cable insulating material and a preparation method thereof. The cable insulating material is prepared from the following components: ethylene-vinyl acetate copolymer, epoxy resin, chloroprene rubber, hydrogenated nitrile rubber, high density polyethylene, modified bentonite, modified nano-crystalline cellulose, modified quick lime, titanium dioxide, zinc oxide, magnesium stearate, dibutyl phthalate, fusing agent, flame retardant, lubricant and antioxidant. The cable material prepared by the invention has excellent mechanical property and insulating property, good tensile resistance and impact resistance, has low water absorption rate and is less likely to be affected with damp, thereby having a good application prospect.

The invention relates to a method for improving mechanical properties and hydrophobic and oleophobic properties of aramid insulating paper. Para-position aramid fibers are added in a papermaking process of meta-position aramid insulating paper. Compared with meta-position aramid fibers, the para-position aramid fibers have better mechanical properties, so that the mechanical properties of the meta-position aramid insulating paper are further improved. The aramid insulating paper is modified by utilizing fluorine gas; after modification, a new group is introduced into the surface of the aramidinsulating paper so that the contact angle of the surface of the aramid insulating paper is enlarged and the hydrophobic and oleophobic properties of the aramid insulating paper are increased. A high-temperature soft calendering method is utilized so that the structure of the aramid insulating paper is not damaged and the crystallization degree of the aramid fibers can be greatly improved; meanwhile, the acting force between aramid cellulose chains is enhanced through a hot pressing manner, the combination is tighter and the linear density is increased; the tearing index and the tensile indexof the aramid insulating paper are greatly improved. The preparation method of the aramid insulating paper, provided by the invention, has the characteristics of simple technology, practicability andthe like.

The invention belongs to the technical field of communication, and relates to an anti-electromagnetic field powerful optical cable. The anti-electromagnetic field powerful optical cable solves the technical problems that the prior art has low structural strength, poor performance and the like. The anti-electromagnetic field powerful optical cable comprises a center reinforcer and a plurality of cable cores, wherein a loose bushing is sleeved on the periphery of each cable core respectively; a fiber paste for enclosing and protecting the cable core is arranged in the loose bushing; the loose bushing is intertwisted around the center reinforcer; the periphery of the loose bushing is provided with a first protective cover for covering each loose bushing; the periphery of the first protective cover is provided with a plurality of galvanized steel wires enwound on the first protective cover; and the peripheries of the galvanized steel wires are provided with second protective covers for covering each galvanized steel wire. The anti-electromagnetic field powerful optical cable has the following advantages that: 1, the weatherability is good, the high and low temperature properties are excellent, and optical fibers have no hydrogen losses caused by the oxidation of phosphorized steel wire or steel strips; 2, the tensile strength, lateral pressure resisting intensity and impact resistance are high, metal components are completely isolated from the cable cores, and the optical cable can also be used normally in a strong electromagnetic field environment; and 3, the structure is compact, the production process is simple, and the optical cable can be produced by using existing equipment.

The invention relates to the technical field of cable materials, in particular to thermoplastic rubber particles and a preparation method thereof. The thermoplastic rubber particles prepared by the invention have the advantages of no toxicity, environmental protection, aging resistance, high and low temperature resistance, oil resistance, water resistance, corrosion resistance of general chemicals, soft texture, high tensile resistance, tensile property and low wear resistance, can be suitable for cables in mobile laying places with rated voltage of 450/750V and below, avoids a vulcanization process, and is relative low in the specific gravity.