144results about How to "Improve shrinkage resistance" patented technology

The present invention discloses one kind of multifunctional modified atactic polypropylene pipe material and its preparation process. The atactic polypropylene pipe material consists of atactic copolypropylene, environment friendly fire retardant, pre-dispersed master batch of inorganic stuffing, impact modifier, antioxidant, composite antibacterial master batch and dispersant. It is applied in building pipes, pipeline for beverage and food industry, heat supply system and farm irrigation system. It has fire retarding and antibacterial functions, less shrinkage, high low temperature impact resistance, high heat resistance, high mechanical performance and excellent heat stability.

It is to provide a block copolymer and its copolymer composition which provides a heat shrinkable (multilayer) film with less spontaneous shrinkage while maintaining favorable low temperature shrinkability, and a heat shrinkable (multilayer) film containing the block copolymer. By using a block copolymer comprising a vinyl aromatic hydrocarbon and a conjugated diene characterized in that the relation of the loss tangent value obtained by dynamic viscoelasticity measurement with the temperature satisfies specific conditions, or a composition containing the copolymer composition as an essential component, a heat shrinkable (multilayer) film with less spontaneous shrinkability and less odor while maintaining favorable low temperature shrinkability can be obtained.

The invention discloses anti-cracking steam-curing-free ultra-high-strength high-toughness concrete. The anti-cracking steam-curing-free ultra-high-strength high-toughness concrete is prepared from cement, fly ash, silica fume, a mineral activator with cementing property, gravel, river sand, steel fibers, a polymer emulsion, water and a shrinkage-reducing super-dispersing admixture, wherein the mineral activator with cementing property comprises waste prefabricated concrete set cement crystal seeds and desulfurized gypsum. By using the mineral activator with cementing property in the concrete, high-temperature steam curing and pressurized steam curing systems adopted in the ordinary ultra-high-performance concrete are eliminated; and the shrinkage-reducing super-dispersing admixture having the functions of super-dispersing cement, reducing shrinkage, decreasing viscosity and the like is adopted to enable the hydration activity of cement to give a full play so that the strength of the concretes has no obvious change after cement usage is decreased by about 10%; and meanwhile, the mineral activator and the admixture can effectively suppress the shrinkage of concrete. The concrete prepared by the preparation method is higher in strength, toughness and shrinkage resistance, low in cost and simple in preparation method and has important practical application value.

The invention provides a thermoplastic polyurethane composite foamed material and a preparation method thereof. The thermoplastic polyurethane composite foamed material is prepared from 10-25 parts of polyurethane, 35-45 parts of ethylene-vinyl acetate copolymers, 15-30 parts of polyolefin elastomers, 6-10 parts of polyethylene, 6-18 parts of ethylene propylene diene monomers, 6-15 parts of polybutadiene polymers, 3-5 parts of filler, 1.5-2.2 parts of zinc oxide, 0.4-0.6 parts of stearic acid, 0.8-1.4 parts of zinc stearate, 0.1-0.4 parts of a cross-linking agent, 0.7-1.0 part of a bridging agent and 2.5-3.5 parts of a foaming agent. The thermoplastic polyurethane composite foamed material is high in rebound resilience, resistant to compression and good in tear resistance. The preparation method of the thermoplastic polyurethane composite foamed material comprises steps as follows: 1) components except zinc oxide, the cross-linking agent, the bridging agent and the foaming agent are weighed; 2) all the components weighed in the step 1) are mixed; 3) the rest components are weighed; 4) the components weighed in the step 3) are added to a material obtained after mixing in the step 2) for mixing; 5) granulation is performed; 6) foaming is performed.

The invention discloses plastering gypsum and a preparation method thereof, and relates to the technical field of gypsum. The plastering gypsum comprises the following raw materials in parts by weight: 55-65 parts of desulfurated gypsum, 40-42 parts of modified rubber powder, 34-36 parts of cement, 24-26 parts of liquid paraffin, 20-22 parts of modified kieselguhr, 18-20 parts of mineral admixture, 14-16 parts of manganese slag, 10-14 parts of an auxiliary agent and 45-65 parts of water. The plastering gypsum is adhered to a base wall well, a coating cannot crack and cannot drop easily, and construction is facilitated.

The invention discloses a waterborne binder for tile. The waterborne binder comprises an acrylic pressure-sensitive adhesive, hydroxypropyl methyl cellulose, polyvinyl alcohol (PVA) powder, water, an antifoaming agent, an antiseptic, a styrene-acrylic emulsion and an antifreezing agent. The above components are subjected to mechanical processing so as to prepare the waterborne binder for tile. The waterborne binder for tile has good thixotropic performance, improved shrinkage and cracking resistance, enhanced surface quality, improved bonding strength, good smoothness in brushing and excellent tile wettability and spreadability; with the binder, the tile is hard to slide and not prone to the phenomena of hollowing, tile falling and the like after bonded onto a wall; and the binder has good bonding performance, high strength, good resistance to water, freezing and thawing and ageing and allows the surface of the bonded tile to be easy to clean due to usage of the antifoaming agent as the component.

The invention relates to a low-cement refractory castable for pumping construction, which comprises a dry material and an additive, the dry material comprises the following components in parts by weight: 55-68 parts of refractory aggregate, 12-27 parts of refractory powder, 3-10 parts of superfine powder and 1-9 parts of binding agent, the additive comprises fibers and a composite additive, the weight of the fibers is 0.01-3% of the weight of the dry material, the weight of the composite additive is 0.1-0.5% of the weight of the dry material, and the weight of the water is 5-12% of the weight of the dry material. The invention provides the low-cement refractory castable with the volume density of 2.2-2.8 g/cm3, the castable makes up the defect that the traditional low-cement refractory castable cannot be pumped, realizes the pumping of the low-cement refractory castable, is convenient for on-site pouring construction, solves the difficult problem of vertical conveying of the refractory castable of a high and large furnace body, reduces the workload of workers, and improves the pouring efficiency; and the stirred material reaches the working surface within a short time, so that the working surface can be prevented from being added with water again, and the performance of the refractory lining is effectively ensured.

Disclosed is a photosensitive resin composition that includes (A) a cardo-based monomer represented by the following Chemical Formula 1 or 2, (B) a cardo-based resin, (C) a reactive unsaturated compound, (D) a pigment, (E) an initiator, and (F) a solvent, and a light blocking layer using the same. In Chemical Formulae 1 and 2, each substituent is the same in the detailed description.

The present invention relates to the technical field of premixing mortar, particularly dry mixed ground mortar for effectively solving dusting and peeling of a ground. The mortar comprises the following components in percentage by mass: 40%-60% of limestone rock machine-made sand, 20%-30% of yellow sand, 3%-7% of coal ash, 15%-21% of cement and the balance of an additive, wherein the additive is a modifying agent and a thickening agent; the modifying agent is one of or a mixture of cellulose ether, an air entraining agent or a water reducing agent.

The invention discloses a formula of a gypsum binder. The gypsum binder comprises the following raw materials in parts by weight: 100 parts of desulfurized gypsum, 0-5 parts of polyvinyl alcohol, 0.1-0.7 part of methyl cellulose and 0-0.2 part of sodium citrate. The dry powder is evenly stirred and mixed to obtain the product. The test report indicates that the initial setting time is 30-100 minutes, the final setting time is 45-115 minutes, the folding strength is 2.3-2.9 MPa, the compression strength is 5.5-6.5 MPa, and the bonding (compression shear) strength is 0.40-0.9 MPa. The invention has the advantages of favorable stability, water retention and flow slide property, strong binding performance and favorable affinity, has the function of interfacial activity and greatly enhances the adhesive force between the product and the base material; and the invention has stable pH values, favorable lubricating property, favorable shrink resistance, favorable mildew resistance and the like, and does not need to use gauze at the seam, thereby having the advantages of firm binding and slight expansibility and preventing the phenomenon of cracking.

The invention relates to a low-temperature plasma pre-treatment process which is characterized by comprising the following steps: sorting wool; washing wool; drying; carrying out low-temperature plasma treatment; sizing and the like. The invention is the low-temperature plasma pre-treatment process which is clean and uniform to treat and has water-saving and energy-saving effects, and the surface hydrophilic performance of spinnable blanket wool (yak hair, wool, camel hair and the like) is effectively improved, so that the dyeing property of the wool is improved, and the dyeing, coating and bonding performances are improved.

A high-twisted multi-strand knitting yarn is composed of three fibres, and features that its one fibre is acrylic fibre filament and another two are chosen from silk, bamboo fibre and wood pulp fibre. Its production technology includes pre-treating and double-twisting. The fabric made of it features high air permeability, hydroscopicity, and shrinking resistance.

The invention relates to the technical field of furniture surface treatment, in particular to a wooden furniture surface coating material. The wooden furniture surface coating material is prepared from a main agent and a curing agent, wherein the main agent is prepared from, by weight, 50-60 parts of saturated polyester resin, 5-10 parts of dimethylglyoxime, 3-5 parts of phosphoric acid triallyl ester, 2-4 parts of white corundum, 1-6 parts of attapulgite, 0.5-1.0 part of copper naphthenate, 0.2-0.4 part of cobalt iso-octoate and 2-6 parts of titanium dioxide, the curing agent is prepared from, by weight, 10-20 parts of methyl ethyl ketone peroxide, 5-8 parts of gas phase SiO2, 15-25 parts of dibutyl terephthalate and 0.1-0.3 part of polyvinylpyrrolidone. According to the wooden furniture surface coating material, no deformation or contraction of a base material will be caused in the base material treatment process, and therefore the decorative coating is not broken.

The invention relates to a cable material and in particular relates to an inorganic modified high heat-resistant low-shrinkage low-smoke halogen-free flame retardant polyolefin cable material and a preparation method thereof. The formula of the inorganic modified high heat-resistant low-shrinkage low-smoke halogen-free flame retardant polyolefin cable material comprises 100 parts of matrix resin, 120-160 parts of fire retardant, 10-30 parts of inorganic imvite, 1-4 parts of lubricant and 1-3 parts of antioxidant; the preparation method of the cable material comprises the steps of firstly, stirring the raw materials in a high-speed mixer evenly, secondly, banburying in a temperature interval from 110 to 130 DEG C by use of a Banbury mixer, and then feeding by use of a twin-screw feeder, extruding by use of double screws, molding by use of a single screw, hot cutting and pelleting by use of a grinding surface, conveying by use of a cyclone separator, sieving by use of a vibrating sieve and then packaging to obtain the finished inorganic modified high heat-resistant low-shrinkage low-smoke halogen-free flame retardant polyolefin cable material. Compared with a common low-smoke halogen-free flame retardant polyolefin cable material, the thermal aging resistance of the inorganic modified high heat-resistant low-shrinkage low-smoke halogen-free flame retardant polyolefin cable material is improved and the shrinkage performance of the cable material is greatly improved, and therefore, the problem of easy shrinkage of the low-smoke halogen-free polyolefin cable materials at high temperatures is solved.