31results about How to "Low monomer residue" patented technology

The invention discloses an environment-friendly building waterproof paint with a low content of VOC (volatile organic compound) and a preparation method thereof. The paint comprises the following components in parts by weight: 3 to 6.5 parts of water, 0.01 to 0.05 part of thickening agent, 0.25 to 0.55 part of dispersant, 0.4 to 0.8 part of antifoaming agent, 0.05 to 0.25 part of multifunctional auxiliary agent, 0.05 to 0.15 part of antiseptic, 3 to 6 parts of titanium dioxide, 25 to 45 parts of filling material, 30 to 60 parts of emulsion, and 1 to 2 parts of rheological additive. The paint is prepared by a ternary compounding technology, which compounds three components: low-VOC pure acrylic emulsion, low-VOC vinyl acetate-ethylene emulsion, and soap-free organic silicon rubber emulsion; a VOC-free composite rheological system blending technology and a composite silver ion sterilizing and anticorrosion technology. The paint has the advantages of low VOC content, green, no toxicity, high strength, convenience in construction, and stableness in storage.

This invention relates to a method of using glutinous cereal wheat starch to synthesize water absorbent resina. The acroleic acid monomer after neutralizing generate acrylate which can takes reaction with glutinous cereal wheat starch, acroleic acid; under protective system of nitrogen, adopt proper initiator and cross-linking agent, through neutralization and cross linking reaction to generate water absorbent graft copolymer which possess certain crosslink density. This invention adopts typic ammonium persulfate for trigger off, and adopts N, N -methylene bisacrylamide to create proper crosslinking. The course of reaction is geniality, cost low, and product has no need of washing and saponification and so on aftertreatment process. The product can absorb deionized water 600g / g to 1200g / g, suck brine 50g / g to 100g / g. The water retentivity, thermostability and reusing quality of the product are better. It has extensive application prospects at aspect of waterholding material.

The invention discloses a superfine environment-friendly thermal expansion microcapsule which is prepared from a suspension dispersing liquid of an oil phase composition and a water phase compositionby a microwave radiation emulsion polymerization method. A particle size of the superfine environment-friendly thermal expansion microcapsule is of a submicron level; and the microcapsule is high in foaming ratio, environment-friendly, nontoxic and applicable to the fields of textile, papermaking, printing ink, engineering plastics and the like. The invention further discloses a preparation methodof the superfine environment-friendly thermal expansion microcapsule. The thermal expansion microcapsule is prepared on a basis of a microwave radiation radical emulsion polymerization technology; and the preparation method is easy and simple to operate, simple in preparation technology and high in production efficiency.

The invention discloses a paper coating water-based emulsion and a preparation method and applications thereof. Aiming at the problem that the barrier property of the current paper coating emulsion is not good, the invention provides the paper coating water-based emulsion. The method comprises the following steps: using a certain amount of vinylidene chloride, acrylonitrile, methacrylate and methacrylic acid as a mixed monomer, selecting a special seed emulsifier and a mixed emulsifier, adopting seed emulsion polymerization, and finally obtaining the paper coating water-based emulsion. The paper coating water-based emulsion has good stability, environmental protection and good barrier property. A vacuum desorption post-processing method is adopted in the later period of emulsion polymerization, so that the monomer residual quantity of the obtained water-based emulsion is low. The prepared coated paper has no foreign smell, cannot pollute food or drugs, and is more beneficial to applications to the package field of food, drugs and the like.

The invention discloses polyvinyl dichloride (PVDC) coating latex special for cigarette films and a preparation method and application of the PVDC coating latex special for the cigarette films. The PVDC latex is prepared from a certain amount of mixed monomers of vinylidene chloride, methyl acrylate and itaconic acid, a ptomotor, an initiator, an emulgator and a seed emulgator, and the preparation method is seed emulsion polymerization. According to the preparation method, microcrystalline wax capable of having a defoaming effect is added to enable the residual quantity of monomers in the latex is smaller. The cigarette films made of the latex has heat sealing performance and a high barrier property, and can maintain the scent of cigarettes and enable the cigarettes to not go bad and not be affected with damp. The heat sealing strength of the cigarette films is equal to or larger than 3N/15mm, the coating weight is 3g/m<2>, the permeation amount of water vapor is equal to or smaller than 6g/m<2>*24h, the permeation volume of oxygen is equal to or smaller than 36g/m<2>*24h, and the residual quantity of vinylidene chloride monomers is equal to or smaller than 1mg/kg or is not detected.

The invention relates to an acrylate compound for coatings. The compound has a structure represented by a formula (I). The acrylate compound for coatings has lipophilic polycyclic aliphatic groups andhydrophilic hydroxyl groups at a same time and has high polymerization reaction activity. When the acrylate compound is used for a solvent-type acrylic coating, the coating layer shows relatively excellent weather resistance and wear resistance, high glossiness and fullness and the like. When the acrylate compound is used for a water-based acrylic coating, the hydrophilic hydroxyl groups and thelipophilic alicyclic groups of the compound show good solubility in an emulsion system, the polymerization activity is high, the monomer residue amount is low, and the coating after film forming showsexcellent weather resistance, water resistance, oil resistance, impact resistance, high glossiness and the like. The preparation method has the advantages that the technological process is simple, conditions are easy to control, side reactions are few, the raw material conversion rate of reactions is high, and purity of products is high.

The invention discloses a manufacturing method of polyacrylic acid-series water-absorbent resin. The manufacturing method comprises the following steps: obtaining an aqueous solution which contains unsaturated acrylic monomers and a cross-linking agent; mixing foaming agent particles and/or a foaming agent solution, unsaturated acrylic monomers and a cross-linking agent aqueous solution; polymerizing a monomer water solution to form a porous gel-like cross-linked polymer; crushing the porous gel-like cross-linked polymer into gel particles through shearing and/or extruding acting force in a polymerizing process or after polymerizing, wherein the number average particle size of the gel particles is 0.5 to 20 mm, the weight percentage of the gel particles with the particle size of greater than 2 mm is 10 to 100 percent, and the porous structure destruction rate of the gel particles is 0 to 70 percent after the porous gel-like cross-linked polymer is subjected to the shearing and/or extruding acting force; further drying, fining and screening the manufactured gel particles. The liquid absorption characteristic of the water-absorbent resin is not influenced; the water-absorbent resin with high-speed liquid absorption rate and low monomer residue amount can be produced and obtained highly effectively.

The invention discloses a preparation method of salt-resistant acrylic superabsorbent resin. The salt-resistant acrylic superabsorbent resin is prepared from the following raw materials in parts by weight: deionized water 100 parts, sodium hydroxide 33 parts, acrylic acid 63 parts, acrylamide 27 parts, ethylene glycol diglycidyl ether 5 parts, potassium persulfate 0.2 part, and ascorbic acid 0.05 part. The preparation process includes the following steps: (1) dissolving sodium hydroxide in deionized water, adding to acrylic acid for neutralizing to a neutralization degree of 75-85%, adding acrylamide, and stirring to dissolve; (2) adding ethylene glycol diglycidyl ether as a crosslinking agent, to the neutralization liquid, introducing nitrogen gas, adding potassium persulfate and ascorbic acid solutions in turn to initiate a polymerization reaction, keeping the temperature for 60-120min, carrying out extrusion granulation of the polymer, drying at 130-160 DEG C, pulverizing, and sieving to obtain granular resin; and (3) mixing the granular resin with aluminum sulfate powder, silica, ascorbic acid, sodium bisulfite, hydroquinone solution, while spraying ethanol, methanol and the self-made crosslinking agent for rapid surface treatment, drying at 140-160 DEG C, and sieving to obtain the superabsorbent resin product which is suitable for sanitary napkins, diapers and other health supplies materials.

The invention relates to a preparation method of a polyacrylamide emulsion. The method is characterized by comprising the following steps: taking dimethyl diallyl ammonia chloride (DMDAAC) as the cationic monomer, taking ammonium sulfate and PDMDAAC respectively as the dispersion medium and the dispersion agent for CPAM dispersion polymerization in a saline water medium, and making acrylamide to carry out free radical copolymerization reactions with quaternary ammonium salt organic compounds so as to generate the water-in-water type cationic polyacrylamide emulsion. The appearance of the emulsion is in a milk white color, and the particle size is smaller than 1 [mu]m, which is in the range of emulsion particle size value. The preparation method adopts a novel polymer synthesis method, and overcomes the shortages existing in the prior art that a large amount of organic solvent and surfactant used in the synthesis process generates secondary pollutions to the environment and the product cost is greatly increased. The emulsion can be widely applied to the fields of oil field, industrial or city sewage processing, sludge dehydration, paper making, and personal nursing and cosmetic.

The invention belongs to the technical field of solar energy packaging material, and especially discloses a polyolefin packaging film used for solar cell modules. The polyolefin packaging film used for solar cell modules comprises, by mass, 91 to 95 parts of modified polyolefin, 0.5 to 4.5 parts of a crosslinking agent (a peroxide cross-linking agent and a tackifier), 0.8 to 2.8 parts of a silanecoupling agent, 0.12 to 0.36 part of an anti-oxidant, 0.12 to 0.25 part of an ultraviolet light absorbent, 0.2 to 0.8 part of a light stabilizing agent, 0.02 to 0.08 part of a dispersant, and 0.01 to0.03 part of an initiator. According to a preparation method, the anti-oxidant, the ultraviolet light absorbent, and the light stabilizing agent are added, so that excess heat oxidation degradation yellowing of an obtained composition in blending extrusion process are avoided, packaging film yellowing aging is prevented effectively from packaging film production process, the aging yellowing resistance of packaging film under solar light radiation in using process is improved, packaging film anti-aging time is prolonged, and the influences on photovoltaic assembly cell output power is reduce.

The invention provides a preparation method and application of a monomer-residue-free high-activity tackifying chain extender. The preparation method comprises the following steps: mixing an aromatic vinyl monomer, an acrylate monomer, an initiator and a solvent or water, carrying out heating for polymerization, and carrying out double-screw secondary reaction granulation to prepare the monomer-residue-free tackifying chain extender. The epoxy functionalized chain extender disclosed by the invention can be applied to recycled polyester structure materials, and can be applied to repair and growth of bio-based biodegradable plastic molecular chains with polyester structures. The preparation method is simple in process control and low in investment, and the produced monomer-residue-free high-activity tackifying chain extender is stable in composition, simple to use and widely applicable to the fields of medical treatment, packaging, household appliances, automobiles and the like. The method has very good application prospects and industrial values.

The invention discloses a preparation method of a water-absorbing resin. The water-absorbing resin is characterized by using 20-50 parts of methylacrylic acid as a monomer, 10-50 parts of starch as a substrate, 0.5-3 parts of azodiisobutyronitrile as an initiator, 0.2-4 parts of trimethylolpropane as a crosslinking agent, and 35-65 parts of a stearic acid compound as a dispersing agent. The preparation method comprises the following steps: adding water into the starch to be dissolved so as to be pasty, transferring the pasty starch into a reaction kettle, adding methylacrylic acid, azodiisobutyronitrile, trimethylolpropane and the stearic acid compound to the reaction kettle, mixing uniformly, introducing high-purity nitrogen, controlling the reaction temperature, performing a polymerization reaction, drying and crushing. The preparation method disclosed by the invention is simple, accessible to raw materials, low in production cost, easy for controlling the reaction temperature, and low in monomer residual quantity; the water absorption capability of the prepared water-absorbing resin is obviously improved; the tap water absorption capability is up to 850 ml/g above, and the normal saline absorption capability is up to 100 ml/g or above.

The invention discloses a system and a method for preparing absorbable polyester. The system for preparing absorbable polyester comprises a melting tank; and a polymerization reaction device which comprises a polymerization reactor and a polymerization heating plate which are arranged in a stacked mode, and the heating plate is provided with a heating flow channel so as to exchange heat with the polymerization reactor; the polymerization reactor is provided with a reaction cavity, the reaction cavity is communicated with the melting tank, and the shortest distance between cavity walls of the reaction cavity is less than 4cm. According to the technical scheme, a homopolymer of cyclic ester or a copolymer of different cyclic esters can be prepared, and the obtained polyester is high in molecular weight, narrow in molecular weight distribution and less in coloring.

The invention discloses acrylic resin and a preparation method and application thereof. The acrylic resin comprises at least one structural unit (A), at least one structural unit (B), at least one structural unit (C) and at least one structural unit (D). The acrylic resin is obtained by subjecting o-hydroxyl type bridge ring structure acrylate and other acrylate monomers to solution polymerizationand neutralizing dispersion. In addition, the invention further provides a film forming composition comprising polyisocyanate and the acrylic resin and a bi-component waterborne polyurethane coatingcomprising the film forming composition or the acrylic resin. A compact grid structure is formed after curing crosslinking, hydrophobic polycyclic ester group containing bridge ring structure of the acrylic resin endows a coating with higher waterproofness and better physical and mechanical performance.