164results about How to "Excellent resistance to moisture absorption" patented technology

The invention discloses a preparation method of pellet-type formula granules. The method comprises the following steps: (1) selecting at least one of the traditional Chinese medicinal materials; (2) respectively extracting the medicinal materials selected in step (1) for obtaining extracts, or respectively grinding the medicinal materials, or respectively carrying out partial extraction and partial grinding, thus obtaining pretreated materials; and (3) preparing the pretreated materials obtained in step (2) into pellets, thus obtaining the pellet-type formula granules. According to the preparation method provided by the invention, on the basis of the prior art, the preparation process of the formula granules is innovated, the formula granules are innovated into pellets, the fluidity and moisture absorption resistance are good, the friability is small, the shape is round and uniform as well as regular, the content uniformity is small, and the divided dose is accurate.

The invention belongs to the technical field of casting, and particularly relates to a high-strength composite salt core material for low-melting-point alloy casting. The high-strength composite salt core material comprises, by mass, 70%-100% of water-soluble inorganic salt and 0%-30% of a reinforcement, wherein the water-soluble inorganic salt comprises one of low-melting-point salts including potassium nitrate and sodium nitrate, and at least one of high-melting-point salts including potassium chloride, sodium chloride, potassium bromide and sodium bromide, and positive ions of the low-melting-point slats are the same as positive ions of the high-melting-point salts. The invention further discloses a preparation method of a high-strength composite salt core, and an obtained salt core product. The prepared composite salt core has extremely high bending strength, excellent hygroscopicity and small volume shrinkage, and the comprehensive performance is excellent. In addition, the preparation technique of the high-strength composite salt core is simple, raw materials are cheap, and industrial production is easy.

The invention provides a water-based self-drying/quick-drying sand type casting coating and a preparation method thereof, wherein the water-based self-drying/quick-drying sand type casting coating is high in drying speed, little in pollution/pollution-free, safe to use, low in manufacture cost and high in sintering and stripping rate. The preparation method takes natural fireproof materials which are not calcined or electrically molten, such as zircon powder, chromite powder or zirconic composite silicate mineral powder, as basic materials, adopts a normal-temperature cured-type modified macromoleclar polymer as a main normal-temperature self-drying/low-temperature quick-drying binder, takes a quick-drying type silicate binder as a main high-temperature binder, adopts an efficient composite suspension dispersant high in fire-resistant degree and low in hot shrinkage rate and is added with proper amounts of efficient water reducing agents and defoaming agents to prepare a steel-iron casting water-based self-drying/quick-drying coating which is high in content of solid (nonvolatile matter) and low in permeability. The water-based self-drying/quick-drying sand type casting coating is excellent in thixotropy, brushing property and quick-drying function, thereby achieving the aim of saving energy, improving the environment and improving the quality of castings. The water-based self-drying/quick-drying sand type casting coating is applicable to the field of casting coatings.

A gas shielded flux-cored wire (FCW) comprises s steel sheath and core flux, in which recycled welding slag powder is used to partially replace the natural rutile. The core flux contains (by weight): 10-50% recycling welding slag powder, 10-45% TiO₂, 2-7% Si, 5-20% Mn, 0.5-5% Al—Mg (Al/Mg=1), 0-11.52% Na₂CO₃, 0-8.85% K₂CO₃, 0-10% MgO, 0.5-10% fluoride, and iron powder as balance. The recycling welding contains (by weight): TiO₂: 20-65%, MnO: 5%-15%, MgO: 5%-15%, SiO₂: 5%-15%, Fe₂O₃: 1%-10%, Al₂O₃: 1%-10%.

The invention discloses a method for solving the problems of moisture absorption and stickiness of a fabric with a phosphorus flame retardant coating. The method comprises the following steps: by taking two kinds of silane mixed monomers as modifiers and adopting ammonium hydrolysis in an alcohol medium, preparing silica modified sol, then adding 10-20% of phosphorus flame retardants and obtaining a phosphorus-silicon synergistic flame retardant by adopting sol-gel technology; finally coating a raised seat fabric with acrylate emulsion, the phosphorus-silicon synergistic flame retardant, a thickener and water and drying and baking the raised seat fabric, thus obtaining the product. The method has the beneficial effects that the flame retardant efficiency and water resistance of the fabric adopting the phosphorus-silicon synergistic flame retardant are improved, the combustion performance meets the requirement of the national B1 level, and meanwhile, the defects of surface efflorescence, soapy handfeel, stickiness, and the like of original phosphorus are improved.

The invention discloses a preparation method of a water-soluble sand core used for an aluminium alloy or a magnesium alloy thin wall complex casting, and the method is as follows: (a) at room temperature, preparing magnesium sulfate heptahydrate and plasma water into a 20% to 30% magnesium sulfate aqueous solution, adding specific amount of octadecahydrate aluminum sulfate and an additive into the 20% to 30% magnesium sulfate aqueous solution, and heating to 60 to 80 DEG C to prepare a compound binder; (b) premixing homogeneously foundry raw sand, adding a composite binder to obtain mixture core sand; (c) putting the obtained mixture core sand into a core making mould, then putting the mixture core sand together with the mould into microwave environment for heating, removing and demoulding to obtain a water-soluble sand core product. By the method, the water-soluble sand core with good room temperature strength, moisture resistance, chemical stability and low gas-forming amount can be produced, and the water-soluble sand core especially has excellent water soluble collapsibility after casting, and causes no damage to the casting and no pollution to the environment.

The invention discloses a liquid curing agent for a phosphate bonding agent and application thereof. The curing agent comprises two components, wherein 45.16%-55.17% of silane coupling agent serves asthe component I; 44.83%-54.84% of the component II comprising water and citric acid, and the component II, the citric acid accounts for 9.68%-17.24%, and the water accounts for 27.59%-45.16%. The liquid curing agent disclosed by the invention is wide in ram material source, low in cost and simple in preparation and application process. The liquid curing agent is long in using time when used for self-hardening sand production and short in demolding time and is used for bowing hardening of cold core boxes. The adopted compressed air is low in cost, environment-friendly and free of pollution.

The invention discloses water-based two-component bright white finish preventing rash and a preparation process thereof, and relates to the technical field of chemical coating, overcoming a problem that overall application effects are poor because rash and pinholes are liable to generate during construction of water-based two-component paint. The white finish includes a main agent and a curing agent which are separately stored and which are mixed according to a mass ratio of (5-8):1 when in use, and is characterized in that the main agent includes, by weight, 50-60% of water-based hydroxy acrylic resin, 0.1-0.3% of a pH conditioner, 0.5-1% of a polymer defoamer, 5-10% of a film forming aid, 0.1-0.2% of an organosilicon defoamer, 0.05-0.15% of a wetting and leveling agent, 6-10% of deionized water, 0.1-0.3% of an associated type thickener, 20-30% of water-based white paste, 2.75-3.25% of wax emulsion, and 0.1-0.3% of a dispersant; and the curing agent includes, by weight, 65-75% of isophorone diisocyanate and 25-35% of hexamethylene diisocyanate. After construction of the white finish, rash and pinholes are not liable to generate and the overall application effect is good.

The invention discloses a functional sustained or controlled release fertilizer core based on a bio-based adhesive and a preparation method thereof. The bio-based adhesive is prepared through the steps that a biomass material is subjected to a liquidation reaction, bio-based polyalcohol is prepared, and the bio-based polyalcohol, a chain extender, a cross-linking agent and a curing agent are pre-mixed. The bio-based adhesive is prepared from regenerative biomass resources, dependence on petrification-based raw materials is reduced, good degradability is achieved, and meanwhile the bio-based adhesive is high in adhesive performance, good in heat resistance, high in water resistance, easy to spray and easy to dry. The functional sustained or controlled release fertilizer core prepared basedon the bio-based adhesive is high in granulation rate, large in particle strength, excellent in moisture absorption resistance, high in impact resistance, good in roundness, good in storage and transport performance and especially suitable for a coated sustained or controlled release fertilizer production process, the material fluidifying performance can be improved, the specific area of the fertilizer core is reduced, and the coating cost of controlled-release fertilizer is greatly reduced.

This magnetic material composition comprises: magnetic alloy particles of an Fe-Si-Cr system, an Fe-Si-Al system or the like, with the surface of each particle being provided with a passivation film; and a glass component that has a softening point of 650-800°C and contains Si, B and an alkali metal such as K, Na or Li. The content of the glass component relative to the total amount of the magnetic alloy particles and the glass component is 12-32 wt%, and a glass phase formed of the glass component is formed between the magnetic alloy particles. A component element (1), in which a coil conductor (2) is embedded, is formed from this magnetic material composition. Consequently, ingress of water or a plating liquid between the magnetic alloy particles can be suppressed, thereby ensuring good insulation without deteriorating the magnetic characteristics.

The invention relates to a negative resist composition used for liquid crystal display, including adhensive resin comprising specific structure, multifunctional (methyl) acrylate monomer, photoinitiator and organic solvent. The negative resist composition has good UV transmittivity, film residua rate, pattern stability and excellent thermal stability and resistance to water. Therefore, the negative resist composition can be used for forming pattern for organic insulation film, red-green-blue color fliter, black matrix, shock insulator or UV protection layer of liquid crystal display.

The invention relates to an adhesion assisting agent-bearing metal foil comprising a layer of an adhesion assisting agent containing an epoxy resin as an indispensable component on a metal, wherein the adhesion assisting agent layer has a thickness of 0.1 to 10 mum. The invention also relates to a printed wiring board being a multilayer wiring board having a plurality of layers, wherein an adhesion assisting agent layer is formed between insulating layers.