42results about How to "No "blooming" phenomenon" patented technology

The invention discloses a precipitate-free flame retardant masterbatch, which comprises the following compositions in part by weight: 5 to 10 parts of modified polyamide, 5 to 30 parts of flame retardant, 0 to 30 parts of flame retardant synergist and inorganic packing, and 0.5 to 5 parts of dispersing agent, wherein the weight ratio of the flame retardant to the flame retardant synergist is 10-25:100. Flame retardant materials prepared by adding the precipitate-free flame retardant masterbatch into high polymer materials do not have the precipitated flame retardant even if used for a long time, and have good flame retardant effect. Because flame retardant is not precipitated, the surfaces of the flame retardant materials have no 'frosting' phenomenon, and the flame retardant materials prepared from the flame retardant masterbatch are excellent in appearance.

The invention discloses a phosphorus-containing macromolecular intumescent flame-retardant charring agent with a cross-linked structure as well as a preparation method and an application thereof. A structural general formula of the phosphorus-containing macromolecular intumescent flame-retardant charring agent is as shown in the specification, wherein X, Y and Z are any one of diamine, diol group, alkylol amine or diphenol, and can be the same, and can also be different. The invention further relates to a preparation method of the flame-retardant charring agent, and an application of the flame-retardant charring agent as a carbon source of a novel intumescent flame-retardant system, and an application of novel intumescent flame-retardant system in polyolefin, polyurethane, polylactic acid, polyamide and epoxy resin. The intumescent flame-retardant charring agent prepared by the method has good charring property, and is free of halogen, low in toxicity and high in water resistance, good in compatibility with a plurality of flame-retardant high polymers, relatively small in effects on mechanical property, simple in synthesis process, easy to control, and easy to put into industrial production.

The invention relates to a method for coating and modifying sulfur. The method comprises the following steps: mixing inorganic powder with water to prepare an inorganic powder suspension, adding a modifier, processing the suspension, grinding the obtained processed suspension, adding a coating agent emulsion to the processed inorganic powder suspension, uniformly stirring the emulsion and the suspension, adding sulfur to obtain an inorganic filler / coating agent emulsion / sulfur mixture, drying the mixture, crushing the dried mixture, and sieving the crushed mixture to obtain coated modified sulfur. The method has the advantages of simple device requirements, rapidness and high efficiency in the preparation process, environmental protection and no pollution, and realization of high sulfur release yield and no frosting of the product in the vulcanizing stage, and has good economic benefits as a rubber vulcanizing agent.

The invention discloses a polyamide intumescent flame-retardant char-forming agent having a main chain containing a piperazine structure; the char-forming agent has the structure general formula defined in the specification, wherein R1 is any one of H, straight-chain or branched-chain alkyl with the number of carbon atoms of 1-4, phenyl, benzyl or phenol, R2 represents straight-chain or branched-chain alkyl with the number of carbon atoms of 1-8, and n is more than or equal to 1. The invention also relates to a preparation method of the intumescent flame-retardant char-forming agent, an application of the intumescent flame-retardant char-forming agent as a carbon source of a novel intumescent flame-retardant system, and an application of the novel intumescent flame-retardant system in halogen-free flame retardancy of polyolefin, polyurethane, polylactic acid, polyamide, ethylene-propylene-diene monomer, silicone rubber and epoxy resin. The prepared intumescent flame-retardant char-forming agent has the advantages of no halogen, low smoke, low toxicity, good thermal stability, high char-forming efficiency, strong water resistance, relatively little influence on mechanical properties of flame-retardant polymers, and simple synthesis process, can be prepared by a one-step method, and is prone to industrialized production.

The invention belongs to the chemical technical filed, relating to production formula of an anti-aging rubber belt, which is composed of neoprene adhesive, natural adhesive, sulfur, vulcanizing agent DTDM, zinc oxide, antioxidant 4010Na, antioxidant ODA, stearic acid, paraffin, high wear-resistance carbon black, accelerator DM, accelerator Na-22 and engine oil. The preparation method is that the materials are face smelted in a face smelting machine. Then certain weight of the face smelted rubber compound is put into a vulcanizer to be vulcanized. The product is obtained after the vulcanization. The product has the advantages of low cost, anti-aging, long service life and no blooming on the surface.

The present invention relates to a method for preparing natural rubber gloves without blooming, which comprises the steps of: S1, preparing pre-vulcanized natural rubber latex: adding 2-8 parts by weight of a first vulcanizing agent, 0.5-4 parts by weight of a second vulcanizing agent and 0.5-2 parts of vulcanization accelerator is mixed into 90-120 parts of natural rubber latex, pre-vulcanized for 1-10 hours at a temperature of 40 ℃ to 80 ℃, and then parked; the first vulcanizing agent is a resin vulcanizing agent, and the The second vulcanizing agent is thiurams or triazine sodium salts; S2, preparation of impregnated mucilage: by weight, take 90-120 parts of the pre-vulcanized natural latex prepared in step S1, and 0.5-1.5 parts of active agent Mixing, adding a thickener to prepare to a predetermined viscosity; S3, dipping the glove embryo: immersing the glove embryo in the dipping glue prepared in step S2; S4, vulcanizing and drying: preparing the non-blooming natural rubber gloves. The natural rubber gloves prepared by the method of the invention have no blooming phenomenon after being placed indoors for 1 year, and the EN388 test level reaches 3141.

The invention relates to a geopolymer taking stone coal vanadium extracted tailings as major raw materials and a preparation method thereof. According to the technical scheme, the geopolymer is prepared from the following components in percentage by weight: 57-78 percent of stone coal vanadium extracted tailings, 5.5-10 percent of silicon-aluminum corrective addition, 10-18 percent of solid base excitant, 1-3.5 percent of water-proofing agent, 2-10 percent of stuffing and 2-10 percent of deionized water. The preparation method comprises the following steps of: adding a base excitant solution prepared by dissolving the solid base excitant in the deionized water into a mixture prepared from the stone coal vanadium extracted tailings and the silicon-aluminum corrective addition, and stirring; adding the water-proofing agent and stuffing, and stirring; and performing press forming, coating a molded blank with a plastic film, curing, demolding and standing at room temperature. The preparation method has a simple process, low cost and low energy consumption; and the geopolymer has high compression strength, high dry-shrinkage resistance and high impermeability, and is prevented from scumming after standing for a long time.

The invention provides a kind of antisepsis and antifungal agent for bamboo wood materials, which is mainly obtained by adding zinc-containing compounds, copper-containing compounds and cationic surfactants to the substrate; the present invention uses bamboo vinegar, wood vinegar and grass vinegar as main components, Biological (chemical) wood preservatives are prepared by compounding water-insoluble inorganic compounds, and nitrogen-containing compounds of ammonia, ammonium salts or amines can also be added to increase its solubility. The beneficial effects of the invention are mainly reflected in: strong loss resistance (loss rate less than 2%), low hygroscopicity, no blooming phenomenon, low toxicity, good anti-corrosion and anti-mildew effect, and can also be used for discoloration treatment of wood and bamboo.