479results about How to "Improve water resistance" patented technology

The invention provides a method for preparing an epoxy/ acrylic acid hybrid emulsion capable of being dried at a normal temperature, and application of the epoxy/ acrylic acid hybrid emulsion. The method comprises the following steps: firstly, an acrylic acid and an alkyl acrylate monomer are used to prepare a seed emulsion; secondly, an alkyl acrylate solution of epoxy resin is subjected to pre-emulsification; and thirdly, a pre-emulsified liquid is dripped into the seed emulsion, and the mixture is subjected to emulsion polymerization continuously to prepare the epoxy/ acrylic acid hybrid emulsion. Compared with the chemical modification methods such as graft copolymerization, esterification and modification of free radicals, the method has low reaction temperature and simple technique; and the prepared emulsion does not contain an organic solvent and has superior water resistance and solvent resistance. The hybrid emulsion prepared by the method can be used for preparing water-soluble self-dried coating; and the coating is quick to dry, has good adhesion, particularly greatly improves the water resistance and the solvent resistance, and can be widely applied to coating in the fields of metallic anticorrosion, buildings, wooden ware and so on.

The invention discloses an integrated honeycomb SCR (selective catalytic reduction) catalyst for low-temperature smoke denitration and a preparation method of the catalyst, wherein the integrated honeycomb SCR catalyst comprises substrates, active elements and additives; the substrates are TiO2 and ZSM-5 molecular sieve powder; the active elements comprise ZrO2, MnO2, Fe2O3 and CeO2. The catalyst provided by the invention not only has higher catalytic activity at a low temperature (120 DEG C), but also has a good waterproof property and a higher practical application value in engineering.

An electronic control unit includes an electronic circuit substrate and a casing that accommodates the electronic circuit substrate. A plurality of electronic components are mounted on the electronic circuit substrate. A plurality of connector terminals extend through a side wall of the casing for electrically connecting the electronic circuit substrate to external wires. A retainer portion capable of retaining liquid seal agent is arranged at an inner side of the wall through which the connector terminals extend.

The invention provides a preparing method of an environment-friendly solvent-type electrostatic spinning waterproof and moisture-permeable membrane. The preparing method is characterized by comprisingthe steps of 1, preparing a high-molecular polymer solution with water or environment-friendly alcohols being solvents, adding a corresponding water-soluble or alcohol-soluble water repelling agent and cross-linking agent, and preparing a hydrophobic fiber membrane through an electrostatic spinning technology; 2, conducting aftertreatment on the fiber membrane to trigger a chemical crosslinking reaction between a polymer matrix and the cross-linking agent, reinforcing the water resistance of the fiber membrane and regulating the pore structure of the fiber membrane to obtain the environment-friendly solvent-type electrostatic spinning waterproof and moisture-permeable membrane. In the production process, no waste gas, waste water and solid waste are generated, the environment cannot be damaged, the prepared waterproof and moisture-permeable membrane does not contain toxic solvents, and in the actual application, the healthy of a wearer cannot be damaged; the resistance to water pressure of the fiber-based waterproof and moisture-permeable membrane is larger than or equal to 150 kPa, the moisture permeability is larger than or equal to 15,000 g/m<2>/d, the tensile breaking strengthis larger than or equal to 30 MPa, and the environment-friendly solvent-type electrostatic spinning waterproof and moisture-permeable membrane has a large application prospect in the field of functional protective clothes.

The invention discloses a polyacrylate emulsion with high water resistance and a preparation method thereof. The polyacrylate emulsion consists of the following components (in parts by weight: 1-10 parts of isooctyl acrylate; 15-40 parts of butyl acrylate; 10-45 parts of methyl methacrylate; 3-5 parts of methylacrylic acid; 2-8 parts of epoxy functional monomer; 0.5-2 parts of a reactive emulsifier; 0.1-0.3 part of a nonionic emulsifier OP; 0.1-0.4 part of ammonium persulfate and 50-100 parts of deionized water. The preparation method thereof comprises three steps of pre-emulsification, seeding polymerization and polyreaction. In the preparation method, a monomer with vinyl and epoxy is taken as the functional monomer, which facilitates to improve the water resistance of the polyacrylate emulsion.

The invention relates to a method for preparing a Pickering acrylic polymer emulsion. According to the invention, an amphiphilic nano-particle is mainly taken as a stabilizer, an acrylic monomer is taken as an oil phase, and Pickering emulsion polymerization is carried out in the selected redox initiation system to directly produce an acrylic nanocomposite. Since the curing product of the nanocomposite is free of a surfactant, the nanocomposite has excellent water resistance and anti-erosion performance. In addition, the nanocomposite has the both advantages of the polymer and the nano-particle, and therefore the nanocomposite has better mechanical properties, thermal stability, corrosion resistance and other performances than the conventional polymer material.

The invention discloses a halogen-free intumescent flame-retardant polypropylene mixture and a preparation method thereof and relates to the field of resin flamer-retardant modification. The mixture comprises the following components: polypropylene, a phosphorus-nitrogen intumescent flame retardant, a silicon-containing triazine macromolecule charring agent, an organic ceramic precursor, phosphorus-containing nano montmorillonite and an antioxidant; and the polypropylene mixture is prepared by carrying out melt blending on the components. Compared with the prior art, the mixture prepared by the invention has the characteristics of outstanding water resistance, good flame retardance, excellent mechanical property and the like and can be widely applied to the fields of the automobile industry, wires and cables, building materials and the like.

The invention discloses an aqueous composite adhesive and a preparation method thereof, and belongs to the field of high molecular materials. The adhesive is polyurethane/acrylate PUA composite emulsion, wherein based on the total weight of the PUA composite emulsion, the content of the polyurethane is 5 to 20 percent; the content of the polyacrylate is 25 to 45 percent; the content of water is 50 to 70 percent; and the solid content of the PUA composite emulsion is 30 to 50 percent. The preparation method comprises the following steps: preparing the aqueous polyurethane emulsion; preparing the aqueous polyurethane/acrylate PUA composite emulsion from the aqueous polyurethane emulsion; and finally, regulating the solid content of the aqueous polyurethane/acrylate PUA composite emulsion by using de-ionized water, and adding an antifoaming agent, a wetting agent and an antiseptic to prepare the aqueous composite adhesive. In the prepared aqueous PUA composite emulsion, emulsion particles have complex phase structures, a carbamic acid ester chain is knitted tightly with an acrylicacid chain at the molecular level, and the synergic effect between the two makes the performance of a coating better than that of a physically blended coating, so that the aqueous PUA composite emulsion has high performance and environmental protection property.

The invention belongs to the technical field of waterborne coating preparation processes, and particularly relates to an organosilicon-modified waterborne polyurethane composite material and applications thereof. The organosilicon-modified waterborne polyurethane composite material comprises a first step of preparing amino-containing ladder-shaped polysilsesquioxane; a second step of reacting the polysilsesquioxane and a hydrophilic polyurethane prepolymer with end groups of -NCO, to form a prepolymer of the organosilicon-modified waterborne polyurethane; and a final step of adding an alkaline neutralizer and distilled water, and stirring for dispersion. The organosilicon-modified waterborne polyurethane composite material is characterized in that the amino-containing ladder-shaped polysilsesquioxane can react with -NCO of the hydrophilic polyurethane prepolymer with end groups of -NCO, enables the prepolymer to extend chains and has a cross-linking reaction; water-resistant performance of the prepared composite material is greatly increased; and simultaneously hardness and heat resistance of polyurethane are improved significantly due to the introduction of the ladder-shaped polysilsesquioxane. The composite material can be used as surface coating materials of woods, paper and the like, or used as coating agents of textiles and leather.

The present invention relates to water-dispersible urea terminated ether type polyurethanes based on polyether diols, aqueous dispersions of such polyurethanes, and their manufacture. The urea termination can have nonionic hydrophilic substituents.

The invention relates to modified magnesium oxysulfide cement and a preparation method thereof. A modified magnesium oxysulfide cement raw material comprises the following components: 40-80 parts of light calcined magnesia, 15-50 parts of magnesium sulfate heptahydrate, 20-50 parts of water and 0.1-2 parts of modifier. The preparation method comprises the steps: weighing the raw materials according to a proportion, and dissolving the magnesium sulfate heptahydrate into water to prepare a magnesium sulfate solution with a corresponding baume degree; then, adding the modifier into the magnesiumsulfate solution; and finally, adding light calcined magnesia into the magnesium sulfate solution, and carrying out uniform stirring to form cement paste. The modified magnesium oxysulfide cement is prepared; and due to the addition of the modifier, a main hydration product is changed, 5Mg(OH)2.MgSO4.3H2O (513 phase) is converted into 5Mg(OH)2.MgSO4.7H2O (517 phase), and the 517 phase is a whiskerwith good water tolerance, so that the modified magnesium oxysulfide cement has good performances such as high strength, high folding resistance and high water tolerance, and the problems of poor water tolerance and small application range of magnesium oxysulfide cement are solved.

The invention discloses a method for preparing aqueous polyurethane-acrylate composite emulsion. The method comprises the following steps of: synthesizing aqueous polyurethane prepolymer by using dihydric alcohol polymer, diisocyanate and hydrophilic chain extender in the absence of a metal catalyst and an organic solvent, blocking ends of the prepolymer by using a vinyl compound, then neutralizing the polymer, dripping water into the polymer to perform self-emulsification, extending the chain to obtain aqueous polyurethane dispersion, and dripping initiator dissolved acrylate monomer into the dispersion in the absence of additional emulsifier to perform polymerization so as to obtain the aqueous polyurethane-acrylate composite emulsion with high solid content. The solid content of the composite emulsion is over 45 percent; and the preparation process does not use any solvent or metal catalyst, has no pollutant discharge, and is a pollution-free production process. The obtained environmentally-friendly aqueous polyurethane-acrylate composite emulsion with high solid content can be used as adhesive, coating and the like.

The invention discloses a preparation method of a graft copolymer for surface sizing, comprising the following preparation processes of: hydrolyzing starch under enzyme action, then modifying by a cationic etherifying agent to form cationic starch with a certain molecular weight; adding a reducing agent to the water solution of the cationic starch, then dropwise adding an oxidizer initiator, a hard monomer, a soft monomer, a chain transfer agent, a cationic monomer, an emulsifying monomer, a crosslinking monomer and other functional monomers for graft copolymerization; and performing bacteriostasis treatment on the copolymer to obtain the finished product. The surface sizing agent prepared by the preparation method disclosed by the invention has a small particle size, good stability in storage, quick sizing speed and high retention, and can improve the water resistance as well as the tensile strength and tear resistance of paper.

The invention relates to a super-hydrophobic air filtering membrane as well as a preparation method and application thereof. The method comprises the following steps: a, mixing a suitable polymer material with an organic solvent capable of dissolving the polymer material to obtain a clarified polymer solution; b, adding a pore-foaming agent matched with the polymer solution into the polymer solution and stirring to obtain a clarified mixture solution A; adding a low-surface tension auxiliary agent into the mixture solution A and stirring to obtain a clarified mixture solution B; and c, standing, curing and de-foaming the mixture solution B obtained in the step b to obtain a membrane casting solution. The super-hydrophobic air filtering membrane prepared by adopting the method provided by the invention has the advantages that a water resistance performance is good, the ventilation rate is high, the process is simple and easy to operate, parameters are uniform and the like, which cannot be realized by adopting present common methods and processes. The membrane is applicable to the fields of medical treatment (such as air inlet parts in infusion apparatuses), machines (such as filter screens of engine air cylinders), air purification equipment (such as micro-pore filter screens in air purifiers), spraying, electrons, plastic and the like.

The invention discloses a preparation method of innoxious negative ion aqueous polyurethane, and aqueous polyurethane prepared by the method. The method comprises the following steps: mixing dicyclohexyl methane diisocyanate and aliphatic diol according to a mol ratio of 2.5 to 4; carrying out reaction for 3 to 5 hours at 70 to 90 DEG C to obtain performed polymers; adding dimethylolbutyric acid with hydrophilic groups for taking the reaction for 3 to 5 hours; adding KOH water solution for emulsifying dispersion; and dripping diamine chain extenders for extending chains to obtain aqueous polyurethane latex emulsion. The invention adopts the aliphatic diisocyanate dicyclohexyl methane diisocyanate resin and the aliphatic polymeric diol, does not contain organic solvents such as NMP, acetone and the like often used for preparing the aqueous polyurethane, and does not contain common use neutralizing agents such as triethylamine and the like. The completely innoxious polyurethane material can be prepared, and the invention can be widely used in the fields of medical and health, food and household articles.

The invention provides an inorganic heat-insulating mortar and a preparation method thereof. The inorganic heat-insulating mortar comprises the following components in percentage by weight: 40%-70% of fluorgypsum powder, 0.5%-20% of alkaline exciting agents, 0.5%-5% of sulfate exciting agents, 0.05%-2% of additives and 20%-35% of light-weight aggregates. The inorganic heat-insulating mortar provided by the invention is prepared by taking fluorgypsum as a cementing material, properly doping the alkaline exciting agents, the sulfate exciting agents and a small amount of additives and then adding the light-weight aggregates. Compared with the prior art, the inorganic heat-insulating mortar provided by the invention has the advantages of low heat conduction coefficient, good water resistance and high strength.

The invention relates to a non-halogen, water resistant and expanding type phosphorus nitrogen flame retardant used for polyolefine. The phosphorus nitrogen flame retardant is characterized in that according to the weight percentage, the flame retardant comprises melamine phosphate which occupies 20 percent to 80 percent, triazine derivative which occupies 5 percent to 40 percent, nanometer compound material which occupies 1 percent to 15 percent, phosphonate ester which occupies 10 percent to 20 percent, padding which occupies 0.1 percent to 8 percent and antioxidant which occupies 0.1 percent to 5 percent. The flame retardant adopts the preparation method that the components are mixed, the mixture is coated through the polymer with barrier property, and the integrated modification of the flame retardant is realized. Compared with the prior general non-halogen and expanding type flame retardant, the non-halogen, water resistant and expanding type phosphorus nitrogen flame retardant used for polyolefine has the advantages that the flame retardance is better, the water resistance is greatly improved, the compatibility between the flame retardant and the plastic matrix is good, and the mechanical property and the processing property of the polyolefine are not affected.

The invention provides an electronic device with high water resistance and good sound quality recording and playback functions. The digital camera includes: a first cover (31) having a first sound hole (21) formed at a position facing the microphone (25); a waterproof sheet (40) arranged to cover the first sound hole (21) ; a second cover (32) disposed separately from the waterproof sheet (40); and a second sound hole (22) formed in the first cover (31). The second sound hole (22) is dislocated on the outer periphery of the first sound hole (21), so that it is not located on the extension line of the axis direction of the first sound hole (21). The outer peripheral portion (40a) of the waterproof sheet (40) extends to a position facing the second sound hole (22).

The invention discloses heat insulation inorganic coating and a preparation method thereof. The coating is prepared by combining the super heat insulation function of an aerogel material with the specific water resistant and flame retardant functions of a magnesium phosphate cement material (MPC). Compared with the existing organic polymer aerogel composite coating and ordinary silicate aerogel composite coating, the inorganic waterborne heat insulation coating disclosed by the invention has the advantages of low heat conductivity, good water resistance, good flame retardant property and flame resistance, environmental protection and energy conservation. The heat insulation inorganic coating disclosed by the invention can be widely applied to a variety of fields, such as heat insulation of internal and external walls and roof surfaces of such public buildings as residential buildings, schools, hospitals, factory buildings and the like, thermal expansion damage prevention and protection of such large-volume buildings or facilities as bridges, dams and the like, and protection of top sunlight surfaces of ships, trains and buses.

The invention discloses a large-granule sustained-release ammonium chloride fertilizer, a preparation method thereof and a special granulating sustained-release material. The special granulating sustained-release material comprises urea, aldehyde, modifiers, acidoid, alkaline matters and water, the mole ratio of the urea to the aldehyde is 1-5:1, the mass of the modifiers accounts for 0-30% of that of the urea, the acidoid and the alkaline matters are used for regulating the system pH (potential of hydrogen) value, and the mass of the water is 2-5 times of that of the urea. The large-granule sustained-release ammonium chloride fertilizer is prepared by using commercial ammonium chloride powder as a basal fertilizer and agglomerating, bonding and granulating the granulating sustained-release material. The special granulating sustained-release material has excellent fluidity and stability, has no corrosion to equipment, and is high in granulation balling rate, mellow and smooth in granule and high in granule strength. Besides, the large-granule sustained-release ammonium chloride fertilizer is simple in production process, can be achieved by a normal disc or a drum, low in cost, high in yield and convenient for popularization and application.

The invention provides a method for preparing a waterborne poly(urethane acrylate)/nano-titanium dioxide hybrid material. The method comprises the following steps: (1) firstly, preparing TBT (tetrabutyl titanate) sol; (2) adding mono-polyol and isocyanate as raw materials to a container, adding a hydrophilic chain extender, increasing the temperature of the reaction system to 30 to 80 DEG C and further adding catalysts in the presence of NMP (N-methyl pyrrolidone) as a solvent; and (3) adding triethylamine as a salt-forming agent, reacting for 10min to 60min, and dispersing with water in the presence of ethylenediamine as a chain extender to obtain the waterborne polyurethane emulsion; adding a small amount of gamma-glycidoxy-propyl-tri-methoxy-silane, stirring for 10min to 90min, adding the TBT sol to the reaction system, further dropwise adding a small amount of hydrochloric acid, and keeping stirring for 12h to 48h to obtain the waterborne poly(urethane acrylate)/nano-titanium dioxide hybrid material. The hybrid material of the invention has the advantage that the weather resistance, mechanical properties, coating transparency and other properties of the hybrid material are greatly increased.

The invention discloses a two-channel optical fiber method and two-channel optical fiber sensor for measuring turbidity. The method is characterized in that a detection mode adopting double light sources, four laser beams and four photo-electricity is adopted, and the double different-wavelength light sources can be alternately lightened by an optical measuring module, so that 90-degree scattered lights and transmission lights can be alternately measured; a temperature measuring module is used for collecting temperature signals of water; a signal adjusting module is used for processing collected turbidity signals and temperature signals; a data processing module is used for calculation and treatment so that turbidity values and a temperature values are generated, and the in-site collecting data are transmitted to an upper computer. The different-wavelength light sources are simultaneously measured so that the stray light impact on turbidity measurement is eliminated; the external impact on the light signals is avoided through optical fiber transmission, thus the method has the high-temperature and high-pressure resisting performances and the anti-electromagnetic interference performance; temperature compensation is performed on the measured turbidity values so as to improve the measurement precision of turbidity. In-site online detection for the turbidity values is realized by the method, thus the method is high in sensitivity, excellent in linearity, low in cost and easy to carry and install, and the method is applied to narrow detection space and occasions where detected liquid is limited in capacity.

A method for preparing a highly-damp-proof thin type medium density fiberboard includes the steps of firstly, mixing raw material Monterey pines with fresh poplars to obtain a mixed wood chip; secondly, conducting pre-cooking and cooking on the mixed wood chip, and adding paraffin in the molten state to conduct hot grinding and fiber decomposition; thirdly, adding phenol modified melamine urea resin and liquid composite curing agents to fiber where hot grinding is conducted; fourthly, drying the fiber where sizing is conducted, and adding powder waterproof agents in the drying process; fifthly, preparing the highly-damp-proof thin type medium density fiberboard by conducting continuous flat pressing on dried fiber after separation and mat formation are conduced. According to the method, the PMUF resin replaces traditional MUF resin for producing the highly-damp-proof thin type fiberboard, the resin cost is reduced by 10% to 15%, and the production cost for preparing the highly-damp-proof thin type medium density fiberboard through pressing is reduced by 180 yuan/m<3> to 220 yuan/m<3>. Isocyanate is introduced to serve as the curing agents of the PMUF resin, the molecular structure is improved after the resin is cured, and the waterproof performance of the fiberboard is improved.

This invention discloses formula and method for preparing high-performance water-soluble alkyd antirust primer. The method comprises: synthesizing water-soluble alkyd resin solution, mixing with antirust pigment, filler, water, drier and additives, dispersing, and grinding. The primer utilizes water as the diluting agent, and is noncombustible, thus is safe for the operators. The volatile organic compound (VOC) content is very low, and can meet the state standards of China. Besides, the primer also has such advantages as safe and convenient usage, high mechanical strength, high corrosion, acid, alkali, salt, oil, weathering and water resistance, and good antirust effect, and can be used as primer for transportation means, bridges, storage tanks, pipes and mechanical equipment.

The invention relates to a triazine carbon forming-foaming agent, a synthesis method of the triazine carbon forming-foaming agent, and a flame-retardant polymer composite material prepared from the triazine carbon forming-foaming agent. The invention aims at solving the problem that a carbon forming-foaming agent obtained by the prior art has a very large polarity, strong hygroscopicity, and poorcompatibility with polymers in processing, and thus leading poor surface smoothness of materials extruded fast. A structural general formula of the triazine carbon forming-foaming agent is shown in the patent specification. The synthesis method of the triazine carbon forming-foaming agent comprises the following steps of adding a solvent into cyanuric chloride, adding dropwisely an alkylol amine, an alkylamine and an acid binding agent into the cyanuric chloride solution to obtain a single-substituted substance, preparing a double-substituted substance, heating, carrying out extraction filtration, washing, and drying to obtain the triazine carbon forming-foaming agent. The flame-retardant polymer composite material prepared from the triazine carbon forming-foaming agent comprises a thermoplastic resin, a halogen-free intumescent flame retardant and a processing auxiliary agent. Compared with the existing triazine carbon forming-foaming agent, the triazine carbon forming-foaming agent provided by the invention has better compatibility with non-polar polymers, can be better dispersed in a polymer, and can be utilized for the flame resistance field.

The invention relates to an in-situ ultrasonic polymerization preparation method for industrial alkali lignin modified phenolic resin. The in-situ ultrasonic polymerization preparation method comprises the following steps of performing alkali dissolution, acid precipitation, centrifugation, washing and drying on 5-10% by mass of industrial alkali lignin liquor to obtain purified alkali lignin; successively adding the lignin, part of formaldehyde solution, phenol and alkali in an in-situ ultrasonic reactor, and performing high-energy ultrasonic irradiation treatment on the mixture; and performing further polymerization reaction by adding the rest formaldehyde and alkali in a product obtained after treatment, and carrying out heating, heat preservation and cooling on the product to obtain the lignin modified phenolic resin. The in-situ ultrasonic polymerization preparation method is characterized in that lignin macromolecular structures are damaged by using multiple actions such as breakage, activation and triggering which are generated by ultrasonic waves, and a phenol type structure containing vacancy is formed, and is then triggered to be added with formaldehyde, so that high-performance resin with high phenol substitution is obtained. The in-situ ultrasonic polymerization preparation method solves the problems that the existing pure lignin is easy to polymerize and the activity of the existing pure lignin is reduced after the existing pure lignin is degraded under the action of ultrasonic cavitation.

The invention discloses a self-cleaning antibiosis leather coating. The coating comprises, by weight, 2-3 parts of poly(epsilon-caprolaclone glycol), 0.2-0.4 parts of diphenylimidazoline, 0.1-0.2 parts of Salatrim, 1.7-2 parts of polyvinylpyrrolidone, 0.8-1 part of polyacrylamide, 1.6-2 parts of stannous chloride, 0.1-0.13 parts of triethanolamine, 190-200 parts of methyl methacrylate, 3-4 parts of sodium dodecyl sulfate, 0.1-0.2 parts of urotropine, 0.2-0.3 parts of ammonium persulfate, 6-7 parts of a 20-25% formaldehyde solution, 16-20 parts of zinc acetate, 4-7 parts of silver nitrate, 0.2-0.5 parts of dithiosalicylic acid, 1-2 parts of calcium propionate, 0.1-0.3 parts of aluminum magnesium silicate, 0.7-1 part of hexamethylphosphoramide and 0.07-0.1 parts of iron trichloride. The coating has the advantages of antibiosis and excellent water vapor permeability, and leather coated with an emulsion obtained by using the coating has good antibiosis and excellent health performance.

The invention discloses a preparation method of an aqueous polyurethane emulsion for synthetic leather. The preparation method comprises the following steps of: mixing macromolecular polybasic alcohol, small molecular polybasic alcohol, hydrophilic hydroxy carboxylic acid, diisocyanate and a solvent, wherein the molar quantity of the hydroxyl group in the mixture accounts for 1-5 percent of the total amount of the molar quantities of macromolecular polybasic alcohol, the small molecular polybasic alcohol and the hydrophilic hydroxy carboxylic acid; adding a catalyst after mixing; reacting at the temperature of 80-110 DEG C for 2-6 hours to obtain prepolymer; and reducing the temperature to 60-80 DEG C, adding a chain extender and reacting to obtain the emulsion. The aqueous polyurethane emulsion is prepared by mixing and reacting the macromolecular polybasic alcohol, the small molecular polybasic alcohol, the hydrophilic hydroxy carboxylic acid and the diisocyanate under specific operation conditions according to a certain proportion, adding triethylamine to neutralize the carboxyl group and then adding water to emulsify, wherein a certain amount of trihydric alcohol is used in the small molecular polybasic alcohol; and the water resistance, the solvent resistance and the heat resistance of the aqueous polyurethane emulsion for synthetic leather are improved.

The invention discloses an environment-friendly fluorinated polyurethane-polyacrylate emulsion and a preparation method thereof. The preparation method comprises the following steps: polymerizing diisocyanate, dimethylolpropionic acid, a functional monomer and an anionic hydrophilic chain extender under the presence of a catalyst so as to obtain an isocyanate-terminated double-bond prepolymer; neutralizing with alkali and adding the water solution of a hydrophilic small-molecule chain extender for dispersing, and further initiating a fluorinated monomer and an acrylic monomer under the effect of a water-soluble initiator so as to obtain the environment-friendly fluorinated polyurethane-polyacrylate emulsion. The emulsion adopts a self-emulsifying method, and is subject to a post-chain extension method and free from any organic solvent or small-molecule emulsifier; and the emulsion is good in storage stability, and by introducing fluorine atoms, the water resistance and the solvent resistance of waterborne polyurethane are effectively improved. The emulsion is applicable to a waterborne coating, and a prepared coating film has the properties of excellent water and oil-proofing performance, heat resistance, being non-toxic, safe and highly glazed, and the like.

The invention discloses a preparation method of a starch adhesive for a papermaking coating. The starch adhesive for the papermaking coating is obtained through treating starch as a raw material, carrying out modification treatments comprising degradation, grafting copolymerization and the like of the starch, carrying out crosslinking modification and heating gelatinization, and cooling. The starch adhesive is mainly used in the papermaking coating, and can partially substitute synthetic latex, so the cost of the papermaking coating is reduced. The starch which is adopted as the raw material in the invention costs low and is renewable; and the preparation method has the advantages of simple technology, simple operation, low energy consumption, and no pollution, and enables the synthetic product to satisfy application requirements, so the production cost can be reduced.