57results about How to "Improve initial whiteness" patented technology

The invention discloses a special environment-friendly stabilizer for U-PVC calendered sheet, which is prepared from the following components in weight ratio: 260-300 kg of magnesium-aluminum-zinc composition, 50-150 kg of zinc stearate, and 1010-15-15 kg of antioxidant. 20kg, calcium acetylacetonate 40~68kg, tris(2-hydroxyethyl) isocyanurate 80~130kg, oxidized polyethylene wax 50~250kg, polyethylene wax 30~100kg. The stabilizer of the invention is suitable for continuous calendering and extrusion production of U-PVC sheet, and has moderate dosage, low cost, good production process stabilization effect, good rolling effect, smooth processing, smooth sheet surface, good plasticization, and satisfactory mechanical properties. The requirements of the national standard also have the advantages of non-toxicity and high environmental protection performance; the U-PVC sheet prepared by the stabilizer of the present invention has stable chemical properties, no rust, good impact resistance, and good transparency. Good insulation and low thermal conductivity; good formability and colorability, and low processing cost; the PVC sheet produced conforms to GB/T15267 "PVC Rigid Sheets and Films for Food Packaging" and conforms to YBB00212005 Polyethylene Vinyl chloride solid medicinal tablet.

The invention relates to a magnesium-aluminum-zinc modified non-toxic compound stabilizing agent for a PVC (Polyvinyl Chloride) foaming material. The stabilizing agent is prepared from a fatty acid calcium zinc composition, an antioxidant, acetylacetone calcium or acetylacetone magnesium, hydrotalcite, dehydroacetic acid or sodium dehydroacetate, trihydroxyethyl isocyanurate, macromolecular ester-group calcium, calcium carbonate or talcum powder according to a weight ratio. A formula of the stabilizing agent adopts the trihydroxyethyl isocyanurate so that a product has good whiteness and machining stability; the fatty acid calcium zinc composition and the macromolecular ester-group calcium in the formula can improve the product machining performance and the product compatibility so that the product comprehensive performance is the best; the stabilizing agent is used for extruding a PVC foaming sheet material and has the advantages of good stabilizing effect, smooth machining and good whiteness; the mechanical property meets various international requirements and the difficulty that an AC (Azodicarbonamide) foaming agent is added and is easily subjected to a color reaction with a substance with the high activity is overcome; and the magnesium-aluminum-zinc modified non-toxic compound stabilizing agent has the advantages of no toxin and environmental friendliness.

The invention provides a preparation method of cotton pulp. The preparation method comprises the following steps: sequentially performing dry impurity removal and wet impurity removal on cotton linter to obtain impurity-removed cotton linter; mixing the impurity-removed cotton linter with cooking liquor, heating to 85-95 DEG C, and preserving heat for 50-70 min; continually heating to 110-125 DEG C, and preserving heat for 120-300 min to obtain a cooked slurry; sequentially pulping, desanding, chlorinating and alkalizing, bleaching, performing acid treatment and a papermaking process on the cooked slurry to obtain the cotton pulp, wherein the cooking liquor comprises alkali and hydrogen peroxide. By the preparation method, hydrogen peroxide is added in the cooking process, and cooking is carried out by two stages at low temperature, so that a role of hydrogen peroxide in destroying colored groups of cotton fiber is fully played, the initial whiteness of the cooked slurry is improved, and the alpha cellulose content of the cotton pulp is increased; meanwhile, by the preparation method, the quality of the cotton pulp is greatly improved, and paper pulp pollution of the cotton pulp is reduced. The invention further provides a preparation method of viscose fiber.

The invention discloses a preparation method for high-brightness calcium acetylacetonate for PVC (Polyvinyl Chloride) heat stabilizer. A report about the preparation of high-brightness calcium acetylacetonate is not provided at present. The preparation method comprises the following steps of: oxidizing divalent iron ion and divalent manganese iron in a calcium chloride aqueous solution into trivalent iron ion and tetravalent manganese by oxidant, respectively; adjusting the pH value of the solution, so that iron and manganese are separated from the liquid phase in the forms of ferric hydroxide precipitates and hydrated manganese dioxide precipitates; filtering the solution to obtain calcium chloride solution free of iron and manganese impurities after the solution is treated by an adsorbent; preparing calcium chloride into calcium hydroxide by a conventional method; and enabling calcium chloride and acetylacetone to react to generate high-brightness calcium acetylacetonate. The preparation method disclosed by the invention is low in cost, good in quality and high in cost performance; and the obtained high-brightness calcium acetylacetonate is compounded with other additives to form the PVC heat stabilizer, so that the PVC product has good initial brightness during the processing process.

The invention relates to the application of bipyridine ester phosphite to a PVC heat stabilizer. bipyridine ester phosphite can be applied to preparation of a liquid barium-zinc stabilizer, a liquid barium-cadmium-zinc stabilizer and a liquid calcium-zinc stabilizer. The liquid barium-zinc stabilizer is prepared from, by weight, 40-50 parts of barium isotanoate, 10-15 parts of zinc-based complex, 5-10 parts of bipyridine ester phosphite, 2-7 parts of 2-ethyl acetyl benzoyl methane, 1-10 parts of thiodipropionicacid dilauryl ester and 10-20 parts of tripropylene glycol n-butyl ether. The bipyridine ester phosphite compound has a higher anti-precipitation property than aliphatic or aromatic phosphite ester by means of a novel heterocyclic perssad replacing the aliphatic or aromatic perssad during preparation of the liquid barium-zinc stabilizer, the liquid barium-cadmium-zinc stabilizer and the liquid calcium-zinc stabilizer. By introducing nitrogen atoms to the heterocyclic ring, the auxiliary stabilization effect on phosphite ester is improved remarkably, and then the printing performance and stability of a modified PVC product are improved.

The invention discloses a flame-retardant reinforced high-temperature-resistant nylon composite material which is prepared from the following raw materials in parts by weight: 30 to 45 parts of high-temperature nylon resin, 30 to 55 parts of glass fibers, 10 to 20 parts of flame retardant and 0.1 to 2.0 parts of polyvinylpyrrolidone. According to the material, the polyvinylpyrrolidone is introduced into a formula system of the flame-retardant reinforced high-temperature-resistant nylon composite material, so that the initial whiteness of the composite material can be remarkably improved, titanium dioxide is not required to be added when a light-color product is prepared, the initial whiteness L value of an obtained molded product is greater than 80, and the prepared molded product has an excellent visual effect, the reduction of the cost is facilitated, and the molded product is smooth in surface, so that the problem of fiber floating on the surface of the product is effectively solved.

The invention relates to the technical field of PVC (polyvinyl chloride) heat stabilizers, and provides modified hydrotalcite and a preparation method thereof as well as a PVC heat stabilizer and application thereof in order to solve the problem that zinc salt is invalid after hydrotalcite and zinc salt are compounded in a traditional PVC heat stabilizer, and the modified hydrotalcite is obtained by in-situ synthesis of uracil, epoxy acid, metal salt and other auxiliaries. Urea pyrimidine epoxy acid with excellent HCl absorption and instable chlorine atom substitution is intercalated between hydrotalcite layers, so that the HCl absorption and instable chlorine atom substitution capabilities of modified hydrotalcite can be improved, by-products, such as AlCl3 and MgCl2, capable of replacing Zn after metal strong oxides in the layers absorb HCl can be complexed, and zinc ions in the zinc salt heat stabilizer are prevented from being replaced by AlCl3, MgCl2 and the like; and the modified hydrotalcite and the zinc salt can be used as a PVC heat stabilizer to be applied to a PVC product after being compounded, and the obtained product has excellent initial whiteness and long-term heat stability.

The invention provides a zinc-based heat stabilizer, a preparation method thereof and a heat stabilizer compound containing the zinc-based heat stabilizer. The zinc-based heat stabilizer is a zinc-containing product as shown in the structural formula II, and chemical composition of the zinc-based heat stabilizer is Zn2(HL)(CH3COO)3.xH2O (x=0-1.0) in the description. The zinc-based heat stabilizer and the compound of the zinc-based heat stabilizer have excellent initial stain resistance and long-term heat aging resistance.

The invention relates to the technical field of polyvinyl chloride heat stabilizers, in particular to an arginine metal complex, a compound heat stabilizer and an application thereof. The compound heat stabilizer comprises components as follows: 2-6 phr of an arginine metal complex, 0-0.9 phr of arginine, 0.3-0.9 phr of an auxiliary stabilizer, 0.4-1.2 phr of a lubricant and 0.4-1.2 phr of an antioxidant. The arginine metal complex is used as a main stabilizer of the compound heat stabilizer for PVC and has good initial whiteness and long-term stability, and the mechanical performance and apparent quality of a PVC product can be improved. The PVC product using the compound heat stabilizer has good initial whiteness and long-term stability, excellent heat stabilization effect and good industrial prospects.

The invention relates to a stabilizer auxiliary agent, in particular to a non-toxic environment-friendly stabilizer auxiliary agent and a preparation method thereof. The stabilizer auxiliary agent is prepared from, by weight, 45-65 parts of calcium acetylacetonate, 30-40 parts of modified molecular sieves, 5-10 parts of a chelating agent and 5-10 parts of a coupling agent. A preparation method of the modified molecular sieves comprises the steps of conducting drying and dehydration treatment on molecular sieves, then mixing the molecular sieves with pentaerythritol ester and diisooctyl phenyl phosphite, and grinding the mixture, so that the modified molecular sieves are obtained. When the non-toxic environment-friendly stabilizer auxiliary agent is used, such constituents as beta-diketone, bisphenol A and pentaerythrite in a traditional calcium-zinc stabilizer formula can be substituted, the consumption of hard calcium and hard zinc is reduced, the excellent synergistic effect and lubricating effect are achieved, heat stability time of a PVC product can be prolonged, the precipitation and blooming phenomena are prevented, later-period weatherability is improved, and production cost is lowered. The invention further provides the preparation method of the non-toxic environment-friendly stabilizer auxiliary agent.

The invention relates to thiosalicylic acid fatty alcohol ester barium and a preparation method, composition and application thereof. Thiosalicylic acid fatty alcohol ester barium is synthesized according to the following process routes of 1 an esterification reaction, wherein reacting is continuously conducted for 2.5-3.5 h at the temperature of 105 DEG C to 115 DEG C and the vacuum degree of 0.06 MPa to 0.09 MPa by taking 2-thiosalicylic acid and C8-C22 fatty alcohol as raw materials and taking concentrated sulfuric acid as a catalyst, generated water is removed, then washing is conducted to remove concentrated sulfuric acid, and dewatering is conducted to obtain thiosalicylic acid fatty alcohol ester; 2 a metal saponification reaction, wherein an appropriate amount of solvent-butanediol methyl ether and barium hydroxide is added into the product obtained in the step 1, reacting is conducted for 2.5-3.5 h at the temperature of 105 DEG C to 115 DEG C, and after reacting is finished, dewatering and filtering are conducted. Thiosalicylic acid fatty alcohol ester barium can combine hydrogen chloride separated from PVC to terminate the automatic catalysis effect of hydrogen chloride and generate stable ester by substituting unstable chloride atoms on PVC chains by thiosalicylic acid fatty alcohol ester to prevent thermal decomposition of hydrogen chloride; thiosalicylic acid fatty alcohol ester barium belongs to thiolate and has the effects of an antioxidant, and the system stability is improved.

The invention relates to a production method of super-white polyvinyl chloride resin, and particularly relates to a method for producing super-white polyvinyl chloride resin through vinyl chloride suspension polymerization after-treatment. The method comprises the following steps of preparing a whitening assistant from the following raw materials in parts by weight: 12-18 parts of ethanol, 1-3 parts of liquid carbolic acid, 4-8 parts of a blue pigment substance and 400-600 parts of deionized water; dispersing and diluting the whitening assistant by using the deionized water; and adding the product to slurry polymerized by polyvinyl chloride, stirring evenly, centrifuging and drying to prepare a super-white polyvinyl chloride resin product. Compared with the prior art, the method has the advantages that the whitening effect is good; the whitening efficiency is high; the whitening assistant is a water-soluble high-dispersion solution and a blue pigment molecule is adsorbed by resin particle fold, so that the yellowing phenomenon is eliminated under the blue light-yellow light complementary action; the pigment molecule is fully dispersed in the slurry, so that the coloring efficiency is greatly improved; and the later resin downstream processing cost is reduced.

The invention discloses an antibacterial heat-resistant polyvinyl chloride wall-protecting plate. The wall protecting plate comprises the following raw materials, in parts by weight: 55-80 parts of polyvinyl chloride, 11-23 parts of a vinyl chloride-vinyl acetate copolymer, 5-13 parts of polypropylene, 3-8 parts of chlorinated polyethylene, 3-6 parts of a nano titanium dioxide complex, 0.3-1.5 parts of activated clay, 1-2 parts of hydrotalcite, 0.5-2 parts of nano montmorillonite, 2-3 parts of a composite foaming agent, 0.2-1.1 parts of 1-phenyl-3-methyl-5-pyrazolone, 1-2 parts of zinc stearate, 1-2 parts of calcium adipate, 0.1-0.25 part of sorbitol, 0.53-2.7 parts of cinnamaldehyde barbituric acid, 0.1-0.3 part of a lubricant, 0.1-0.32 part of methyl silicone oil, and 1-3 parts of dibutyl phthalate. The antibacterial heat-resistant polyvinyl chloride wall-protecting plate provided by the invention has good heat resistance and excellent antibacterial properties.

The invention discloses environment-friendly and oil-resistant rubber for sealing. The rubber is prepared from raw materials in parts by mass as follows: 50-70 parts of nitrile rubber, 8-15 parts of a stabilizer, 20-50 parts of modified chloroprene rubber, 20-30 parts of carbon black, 8-12 parts of polystyrene, 1-1.5 parts of a vulcanizing agent, 15-20 parts of an additive, 3-4 parts of stearic acid, 5-10 parts of zinc oxide, 12-18 parts of magnesium oxide, 10-14 parts of an anti-ageing agent, 20-30 parts of paraffin and 4-5 parts of an aid. In combination with the characteristics of nitrile rubber and modified chloroprene rubber, the rubber not only has the characteristics of good oil resistance, higher wear resistance and better heat resistance, but also has high initial adhesive force and bonding strength, flexible adhesive layer, good elasticity, impact resistance and vibration resistance; the proportion of the vulcanizing agent is reduced, so that environmental protection and no pollution are realized; the additive prepared from cyanate ester resin, acrylic resin, sodium tripolyphosphate and kaolin in a specific ratio is added, and accordingly, the air tightness of the rubber is improved.

The invention discloses an environment-friendly stabilizer with low processing temperature and simplicity in plasticization for wires and cables. The stabilizer is prepared from the following components by weight: 45-220kg of a fatty acid calcium-zinc composition, 10-100kg of calcium stearate, 1-10kg of an antioxidant 1076, 3-21kg of stearoylbenzoylmethane, 30-100kg of hydrotalcite, 5-120kg of 2-oxazolidinone and 20-200kg of inorganic hydroxides. The stabilizer disclosed by the invention is used for manufacturing wire and cable colloidal particles, the processing temperature of the stabilizer is 20-30 DEG C lower than that of a compound lead stabilizer, the temperature of each section can be controlled to be 120-130 DEG C for a conical twin-screw extruder, and the energy can be saved; the colloidal particles are good in plasticization, and the wire surface is bright; and moreover, the produced colloidal particle Congo red time is longer than or equal to 60 minutes, and the product is excellent in humidity resistance, particularly is not separated out on a black wire, is good in flowing property and suitable for highly filling wires and also can be applied to medium/low-temperature wires specified in GB8815.