Process for preparing capillary viscosimeter

A method for preparing capillary viscosimeter features that a hydrophobic layer is prepared on the inner surface of capillary by coating, adhering, or thermal expanding method, so preventing the interference of high-molecular chain adsorbed on the inner surfae of glass or metal capillary to viscosity measurement for higher accuracy.

Preparation method of grafting amphoteric chitosan flocculant

The invention relates to a preparation method of a grafting amphoteric chitosan flocculant, comprising the following steps: carrying out graft copolymerization between carboxymethyl chitosan and polyacrylamide to obtain the grafting amphoteric chitosan flocculant, wherein the substituted ratio of a carboxyl group is 5%-90%, and the mass of the polyacrylamide is 40%-80% of the grafting amphoteric chitosan flocculant. The carboxymethyl chitosan can be obtained by separation after carboxylation reaction between chitosan and chloroacetic acid. The chitosan can adopt various commercially availableproducts, and preferably, molecular weight of the chitosan is not less than 50,000, more preferably 750,000-850,000. The carboxymethyl chitosan grafting polyacrylamide flocculant prepared by the method of the invention improves water solubility of the chitosan, is applicable to treating water with different electric charges, and has good salt tolerance; and the flocculant can be also widely applied ...

Composite flocculating agent and preparation method thereof

The invention discloses a composite flocculating agent and a preparation method thereof. The composite flocculating agent is a chitosan-hydrolyzed polyacrylamide composite flocculating agent. The preparation method comprises the following steps of: 1, fully dissolving chitosan in acid aqueous solution to obtain chitosan-containing solution; 2, adding a cerium ammonirm nitrate or ammonium persulfate initiator into chitosan solution obtained in the step 1, adding acrylamide and reacting at the temperature of between 45 and 65 DEG C for 1 to 4 hours so as to obtain a chitosan grafted polyacrylamide material; and 3, adding isopropanol into solution of chitosan grafted polyacrylamide obtained in the step 2, adding aqueous solution of sodium hydroxide (NaOH) and reacting at the temperature of between 55 and 80 DEG C for 0.5 to 4 hours so as to obtain the chitosan-hydrolyzed polyacrylamide composite flocculating agent.

Method for preparing amphiprotic chitosan flocculant

The invention relates to a method for preparing an amphoteric chitosan flocculating agent. The method comprises the following steps that: chitosan is dissolved in an acrylic aqueous solution with a mass percentage concentration of between 0.1 and 1 percent so as to prepare a solution with a mass percentage concentration of chitosan of between 1 and 3 percent; the acquired solution is added with an ammonium ceric nitrate evocating agent, and is added with acrylamide; a mass ratio of the acrylamide to the chitosan is 1 to 1-8 to 1; and a mixture reacts for 2 to 4 hours at a temperature of between 45 and 65 DEG C, thereby preparing the amphoteric chitosan flocculating agent. The amphoteric chitosan flocculating agent prepared by the preparation method has the dual characteristics of having anionic groups and cationic groups, is suitable for processing a water body with different charges, has good salt resistance and wide application range and can be used both in an acid medium and an alkali ...

Normal-temperature fast curing epoxy resin crack pouring agent for roads and bridges

A normal-temperature fast curing epoxy resin crack pouring agent for roads and bridges comprises a component A and a component B, the component A is mainly composed of an epoxy resin, an accelerant, a modified flexibilizer, an epoxy silane coupling agent, a reactive diluent and a coloring agent, the modified flexibilizer is a polyurethane prepolymer of toluene diisocyanate modified hydroxy-terminated polybutadiene liquid rubber, the accelerant is tetrabutylammonium iodide, the epoxy silane coupling agent is KH-560 or KH-530, the component B is mainly composed of a curing agent, the accelerant and an antifoaming agent, and the curing agent is a mixture containing polyetheramine and phenolic aldehyde amine with a mass ratio of 75:25-94:6. A mass ratio of the component A to the component B is 100:80-100:100. The crack pouring agent has the advantages of high bonding strength, good toughness, low viscosity, good wettability, normal temperature curing, fast curing speed and the like. The crack ...

包膜缓释肥料及其制备方法

The present invention relates to a coated granular slowly-releasing fertilizer and its preparation method. It is characterized by that the surface of the nitrogen granular fertilizer is covered witha layer of coated film, and said coated film is formed from nitro-cotton and tung oil as dry oil additive, and the coated film is 5%-30% of total weight and added quantity of tung oil is 0-20% of coated film weight. Its preparation method includes the following steps: dissolving the cellulose compound and its derivative for example nitro-cotton in solvent to obtain covering solution, said solventis ethyl alcohol and ethyl ether mixed solution, then coating surface of granular fertilizer with said covering solution, finally recovering solvent so as to obtain the invented coated granjlar slowly-releasing fertilizer.

PE/magnesium hydroxide composite flame retardant material

The invention relates to a PE/magnesium hydroxide composite flame retardant material which improves the mechanical property of a composite material while ensuring the flame retardance. The PE/magnesium hydroxide composite flame retardant material is prepared from the following raw materials in percentage by mass: 40-70 percent of modified magnesium hydroxide and 30-60 percent of PE, wherein the modified magnesium hydroxide comprises magnesium hydroxide, a PE copolymer containing an epoxide group, and an assistant, and the masses of the PE copolymer containing an epoxide group and the assistant are respectively 1-20 percent and 0.1-10 percent of that of the magnesium hydroxide. As a prefer scheme, the PE copolymer containing an epoxide group is a monomer and contains a copolymer of glycidyl methacrylate and ethylene, wherein the glycidyl methacrylate occupies 1-20 percent of the total weight of the monomer. The invention can greatly improve the compatibility of MH and a macromolecular matrix ...

PE/magnesium hydroxide composite flame retardant material

The invention relates to a PE/magnesium hydroxide composite flame retardant material which improves the mechanical property of a composite material while ensuring the flame retardance. The PE/magnesium hydroxide composite flame retardant material is prepared from the following raw materials in percentage by mass: 40-70 percent of modified magnesium hydroxide and 30-60 percent of PE, wherein the modified magnesium hydroxide comprises magnesium hydroxide, a PE copolymer containing an epoxide group, and an assistant, and the masses of the PE copolymer containing an epoxide group and the assistant are respectively 1-20 percent and 0.1-10 percent of that of the magnesium hydroxide. As a prefer scheme, the PE copolymer containing an epoxide group is a monomer and contains a copolymer of glycidyl methacrylate and ethylene, wherein the glycidyl methacrylate occupies 1-20 percent of the total weight of the monomer. The invention can greatly improve the compatibility of MH and a macromolecular matrix ...

Method for preparing amphiprotic chitosan flocculant

The invention relates to a method for preparing an amphoteric chitosan flocculating agent. The method comprises the following steps that: chitosan is dissolved in an acrylic aqueous solution with a mass percentage concentration of between 0.1 and 1 percent so as to prepare a solution with a mass percentage concentration of chitosan of between 1 and 3 percent; the acquired solution is added with an ammonium ceric nitrate evocating agent, and is added with acrylamide; a mass ratio of the acrylamide to the chitosan is 1 to 1-8 to 1; and a mixture reacts for 2 to 4 hours at a temperature of between 45 and 65 DEG C, thereby preparing the amphoteric chitosan flocculating agent. The amphoteric chitosan flocculating agent prepared by the preparation method has the dual characteristics of having anionic groups and cationic groups, is suitable for processing a water body with different charges, has good salt resistance and wide application range and can be used both in an acid medium and an alkali ...

High performance pavement material of epoxy asphalt, preparation method and application

Preparation method of grafting amphoteric chitosan flocculant

The invention relates to a preparation method of a grafting amphoteric chitosan flocculant, comprising the following steps: carrying out graft copolymerization between carboxymethyl chitosan and polyacrylamide to obtain the grafting amphoteric chitosan flocculant, wherein the substituted ratio of a carboxyl group is 5%-90%, and the mass of the polyacrylamide is 40%-80% of the grafting amphoteric chitosan flocculant. The carboxymethyl chitosan can be obtained by separation after carboxylation reaction between chitosan and chloroacetic acid. The chitosan can adopt various commercially available products, and preferably, molecular weight of the chitosan is not less than 50,000, more preferably 750,000-850,000. The carboxymethyl chitosan grafting polyacrylamide flocculant prepared by the method of the invention improves water solubility of the chitosan, is applicable to treating water with different electric charges, and has good salt tolerance; and the flocculant can be also widely applied ...

Composite flocculating agent and preparation method thereof

The invention discloses a composite flocculating agent and a preparation method thereof. The composite flocculating agent is a chitosan-hydrolyzed polyacrylamide composite flocculating agent. The preparation method comprises the following steps of: 1, fully dissolving chitosan in acid aqueous solution to obtain chitosan-containing solution; 2, adding a cerium ammonirm nitrate or ammonium persulfate initiator into chitosan solution obtained in the step 1, adding acrylamide and reacting at the temperature of between 45 and 65 DEG C for 1 to 4 hours so as to obtain a chitosan grafted polyacrylamide material; and 3, adding isopropanol into solution of chitosan grafted polyacrylamide obtained in the step 2, adding aqueous solution of sodium hydroxide (NaOH) and reacting at the temperature of between 55 and 80 DEG C for 0.5 to 4 hours so as to obtain the chitosan-hydrolyzed polyacrylamide composite flocculating agent.

毛细管粘度计的制作方法

... 本发明属于毛细管粘度计的制作方法。该方法是将毛细管粘度计的毛细管内表面采用涂覆法、粘合法、热胀法处理成具有憎水性毛细管内壁的粘度计，克服在无外加盐情况下，由于高分子链在玻璃或金属毛细管壁的吸附对粘度测定的干扰，从而简洁准确地测定包括聚电解质在内的聚合物水溶液和分散液的特性粘数。 ...

Film-coated slow-released fertilizer and preparation process thereof

Soybean oil-based polyurethane acrylate and preparation method thereof

The invention provides soybean oil-based polyurethane acrylate which is prepared by the following steps of: reacting soybean oil polyatomic alcohol with isophorone diisocyanate to generate a polyurethane prepolymer, and then leading the polyurethane prepolymer to react with hydroxyethyl acrylate. The structure of the soybean oil-based polyurethane acrylate can be shown in the below formula, wherein Y is -OCH3, -OCH2CH2OH or -OCH2CH (OH) CH3. The soybean oil-based polyurethane acrylate has the tensile strength up to 40.4Mpa, the Young modulus of 724.0Mpa and the dielectric constant of 1.0-3.0 under 1MHz. The invention discloses a preparation method of the soybean oil-based polyurethane acrylate.

一种包裹型耐热缓释碳铵及其制备方法

A process for preparing the slow-releasing refractory coated ammonium carbonate fertilizer includes proportionally mixing biodegradable liquid-state ground film, epoxy resin, low-temp solidifying agent, auxiliary and organic solvent to obtain coating liquid, adding antisticking agent, coating the ammonium carbonate particles, and drying.