50results about How to "Reasonable molecular weight distribution" patented technology

The present invention discloses a large hollow container blow molding material, which comprises the following raw materials, by weight, 99.9-100.0 parts of an ethylene hexene copolymerization polyethylene base resin, 0.05-0.10 part of an antioxidant, 0.07-0.12 part of a co-antioxidant, and 0.03-0.05 part of a slip agent. The present invention further discloses a preparation method for the large hollow container blow molding material. The large hollow container blow molding material has characteristics of low fusion index, large molecule weight, high strength, and the like, and is suitable for blowing of large size containers, wherein the product has prominent rigidity and toughness balancing capacity, creep resistance, excellent ESCR and good chemical resistance.

The invention pertains to the technical field of preparing a modified phenolic resin and particularly relates to a synthetic method of a nitrogen-containing and flame-retarding phenolic resin; the synthetic method of the invention comprises the following steps: the monosubstituted melamine monomer and the aldehyde monomer with a mole ratio of 1:2 to 5 are blended and put in to an organic base adjusting solution system with the pH value of 8 to 11 to carry out a hydroxymethylation at a temperature of 65 DEG C to 90 DEG C; the para-orienting organic phenol monomer and the aldehyde monomer with mole ratio of 1:2 to 5 are added into the reaction system; the hydroxymethylation lasts for 0.5 hours to 2 hours at a temperature of 65 DEG C to 90 DEG C; then a condensation polymerization is carried out at the temperature of 75 DEG C to 100 DEG C; an organic solvent is added for the purpose of pressure reduction and azeotropy; the reflow temperature is kept at 60 DEG C to 80 DEG C; after the moisture in the reaction system is removed, an organic solvent is added to dilute, prepare and obtain nitrogen-containing and flame-retarding phenolic resin with a thiotrzinone structure unit, which can be used for producing non-halogen and flame-retarding phenolic resin laminates of grade FV0 and applied as epoxy resin hardeners.

The invention belongs to the field of organic synthesis, relates to a polymer polymerization technology, and specifically relates to a preparation method of an adhesive for the outer layer of an aluminum plastic film of a lithium battery. Under the action of an antioxidant, aliphatic dihydric alcohols, aliphatic dibasic acids, and aromatic dibasic acids carry out esterification reactions in inertgas with a normal pressure. Then aliphatic polyol is added to carry out polycondensation reactions, under the action of a catalyst, water and micromolecular polymers generated in polycondensation reactions are removed at a high temperature in vacuum, and the reactants are dissolved by a solvent to obtain a solution of polymer with a molecular weight of 10,000 to 30,000. The operation is simple andconvenient, the molecular weight distribution is reasonable, the product quality and application performance are stable; and the product has the advantages of crystallization resistance, good flexibility, good anti-tensile performance, good hydrolysis resistant performance, good caking property, and good impact resistant performance. The prepared adhesive can totally meet the application requirements of a lithium battery aluminum plastic film outer layer adhesive.

The invention discloses a preparation method of ultrahigh molecular weight phenolic resin. The preparation method comprises the following steps of: (1) weighing phenol and aldehyde in a molar ratio of 1: (0.8-1.0) respectively, and weighing acid in a mass ratio of the acid to the phenol of (0.5-4): 100; (2) mixing the phenol, partial aldehyde and partial acid, heating till boiling, and refluxing for 2 to 4 hours, wherein the partial aldehyde or the partial acid accounts for 75 to 95 percent of the total adding amount of the aldehyde or the acid; (3) heating and dehydrating the reactants of the step (2), cooling the reactants to the temperature of between 80 and 100 DEG C, adding the rest aldehyde and the rest acid, heating till boiling, and refluxing for 1 to 3 hours; and (4) detecting the melting viscosity of the reactants in the refluxing process of the step (3), adding alkali when the viscosity reaches 2,000 to 4,500MPa.s/100 DEG C, regulating the pH value to be between 4 and 7, heating and dehydrating to obtain the ultrahigh molecular weight phenolic resin. The weight-average molecular weight of the prepared phenolic resin can reach 14,000 to 30,000, the softening point is 120 to 140 DEG C, and the molecular weight distribution is 13 to 19.

The invention discloses a preparing method for amino-terminated polyurethane for improving tenacity of a cured epoxy material. The preparing method includes the following steps that 1, in the presence of a catalyst, polyether glycol and diisocyanate are polymerized in the nitrogen atmosphere; 2, the product is cooled to room temperature, and a viscosity modifier is added to obtain a prepolymer solution; 3, the temperature is kept at 2-10 DEG C, the product in the step 2 is added into an aliphatic polyamine solution, the mixture is heated to 40-50 DEG C, the temperature is kept for 1-3 h, and amino-terminated polyurethane for improving tenacity of the cured epoxy material is collected from a reaction product. The method is simple, polyamine terminal seal with primary amine and secondary amine is involved, the application range is wider, the polymerization success rate is up to 95%, the gel crosslinking phenomenon occurs rarely, the prepared amino-terminated polyurethane molecular chain is uniform and regular, molecular weight distribution is reasonable, and the average molecular weight approaches the theoretical value.

The invention provides an alkyd resin preparation method and the prepared resin thereof, and an acrylic acid modified alkyd resin preparation method and the prepared resin thereof. According to the alkyd resin preparation method, unsaturated carboxylic acid and/or unsaturated anhydride are/is added step by step to improve the structure of the alkyd resin. According to the acrylic acid modified alkyd resin preparation method, a unsaturated monomer is fed step by step, and the feeding time is controlled, so that the unsaturated monomer is uniformly grafted on an alkyd resin, and the molecular weight distribution is narrow. The acrylic acid modified alkyd resin prepared by the preparation method is applied to water-based coating materials, so that a paint film has the advantages of high drying speed, high glossiness, good fullness, low VOC emission, excellent comprehensive performance and the like.

The invention discloses a preparation method of an optical adhesion agent. The method comprises synthesis of an acrylate reactive prepolymer. The synthesis of the acrylate reactive prepolymer comprises the following steps: S1, respectively dehydrating hydroxy functionalized acrylate and polypropylene glycol; S2, adding polypropylene glycol into diisocyanate under the protection of nitrogen, heating to 53-55DEG C, reacting until the content of NCO in reaction liquid is maintained to be unchanged; S3, adding hydroxy functionalized acrylate, a polymerization inhibitor and a first active diluent into the reaction system of S2, heating to 72-75DEG C, and reacting until the content of NCO is zero, so as to obtain the acrylate reactive prepolymer. Diisocyanate is formed by combining 2,4-toluene diisocynate with dicyclohexyl methane diisocyanate. Combined diisocyanate is few in byproduct reaction, the obtained prepolymer is moderate in viscosity and reasonable in molecular weight distribution.The invention also provides an AB glue protecting film.

The invention discloses a preparation method of a high-hexene grafted high-density polyethylene geomembrane blow molding material. The method comprises the following steps: (1) when a diluting agent is always under a circulation state, placing monomer ethylene and 1-hexene in a reaction vessel; adding an antistatic agent and an catalyst subjected to an activation treatment; adjusting the reaction temperature in the reaction vessel to 92-98 DEG C until the melt flow rate of a reaction product is 10.0-13.0g/10min and the density of the reaction product is 0.937-0.939kg/m<3>, thereby obtaining ethylene-hexene polyethylene copolymer base resin with weight average molecular weight of 200,000 to 300,000, 1-hexene content of not less than 1.20% and crystallinity of 46.5-49.5%; (2) uniformly mixing 99.5-99.8 parts of the ethylene-hexene polyethylene copolymer base resin and 0.20-0.50 part of an antioxidant; and adding the mixture to a mixer for extrusion granulation, so as to obtain the geomembrane blow molding material. According to the method, a high-activity novel chromium catalyst is adopted, the equipment limitation of a loop slurry process is overcome, and high-hexene grafted high-density polyethylene is produced. With the method, reaction scale is effectively ameliorated, a reactor wall attachment phenomenon is reduced, production is smooth, and the productivity of the special material is high.

The invention relates to a 1,3-conjugated diene/monovinyl aromatic hydrocarbon copolymer and a continuous polymerization production method thereof. The method comprises the following steps of: continuously feeding reaction materials containing monomers a, an organic solvent, 1,2-butadiene, alkyl tetrahydrofurfuryl ether and organic lithium into a reaction kettle, and polymerizing the monomers a for 30-270 minutes under the conditions of a reaction temperature in the range from 130 to 150 DEG C and reaction pressure in the range from 0.5 to 0.9 MPa, thereby obtaining the copolymer, wherein the monomers a refer to monovinyl aromatic hydrocarbon and conjugated diene, and on the basis of the weight of the monomers a, the dosage of the 1,2-butadiene is 75-225 ppm. The copolymer obtained by the method provided by the invention has high vinyl content, high molecular weight distribution and high Mooney viscosity, and rational gel content. The invention also relates to oil-extended rubber and a preparation method thereof. The oil-extended rubber provided by the invention is suitable for subsequent processing.

The invention provides application of a high-substrate-concentration fermented corn steep liquor product in cultivation and production of edible mushrooms, and belongs to the field of deep processing of agricultural and sideline products. According to the invention, a high-concentration corn steep liquor fermented product is prepared by taking the corn steep liquor as a raw material and adopting a microorganism high-concentration liquid fermentation technology, macromolecular protein in the corn steep liquor can be moderately degraded, so that the corn steep liquor has reasonable molecular weight distribution and has the characteristics of quick-acting and medium-long-acting nitrogen source nutrition supply; nutrient substances in the high-concentration corn steep liquor fermented product can activate synthesis and secretion of enzyme systems of the edible mushrooms and accelerate decomposition of cellulose, lignin and the like in a mushroom bag matrix, so that edible mushroom mycelia can quickly absorb nutrient substances which cannot be utilized in a normal state in the initial vegetative growth stage, generation of various induction enzymes is accelerated, the mycelia are robust and rapidly enter stages of culture medium material decomposition, absorption and resynthesis, and the beneficial effects of high mycelium growing speed, tidy fruiting, improvement of the yield and quality of sporocarp and the like are achieved.

The invention relates to a method for preparing a donkey-hide gelatin plasma substitute injection. According to the method, degradation terminal points of donkey-hide gelatin can be controlled through monitoring relative viscosity of a donkey-hide gelatin solution to ensure polypeptide molecular weight and reasonable molecular weight distribution after the donkey-hide gelatin solution is degraded, so as to enable osmotic pressure of the prepared donkey-hide gelatin plasma substitute injection to be close to that of human plasma, and a relatively good capacity expansion effect is realized in clinic practice; succinic anhydride is used for performing acylation modification on the degraded donkey-hide gelatin solution, a polypeptide chain of the modified donkey-hide gelatin solution is relatively stable, so that the polypeptide molecular weight and the molecular weight distribution are effectively controlled, and the safety and the availability of a product are improved; in a process of preparing plasma substitutes, an appropriate amount of electrolytes such as sodium chloride, potassium chloride and calcium chloride are added so as to ensure that when the donkey-hide gelatin plasma substitutes are injected in quantity, electrolyte disturbance can be avoided; under different PH value conditions, through double adsorption of diatomite and activated carbon, heat sources, impurities and colors can be sufficiently removed, so that adverse reactions in clinical use can be avoided.

The invention discloses a preparation method of an environment stress cracking resistant blow molding material special for an auto plastic fuel tank. The preparation method comprises the following steps: (1) under the condition that a diluent is always in a circulating state and in the presence of a catalyst, placing raw materials including ethylene and 1-hexene into a reaction vessel for reacting, wherein the reaction temperature is 94 to 100 DEG C, and the reaction is stopped when the melt flow rate of a reaction product reaches 5.3 to 6.5g/10min and the density is 0.943 to 0.947kg/m<3>, so as to obtain ethylene hexene copolymerization polyethylene resin; (2) taking and uniformly mixing 99.50 to 99.80 parts of ethylene hexene copolymerization polyethylene resin, 0.05 to 0.35 part of antioxidant, 0.03 to 0.15 part of auxiliary antioxidant and 0.02 to 0.06 part of zinc stearate, then adding the same into a mixing mill for extrusion pelletization, and cooling particles in cooling water; the obtained blow molding material special for the auto plastic fuel tank has relatively high melt strength, excellent environment stress cracking resistance and creep resistance, and good chemical corrosion resistance, and is suitable for machine shaping of single-layer and multilayer auto plastic fuel tanks.

The invention discloses special peptone for producing inosine through fermentation as well as a preparation method and application of the peptone, belonging to the field of peptone preparation. The preparation method for special peptone used for producing inosine through fermentation comprises the following steps: (1) adding various enzymes into fishbone soup to obtain a concentrated fishbone peptone solution; (2) adding various enzymes into a bovine bone soup to obtain a concentrated bovine bone peptone solution; (3) adding various enzymes into a soybean meal filtrate to obtain a concentrated soybean meal peptone solution; and (4) mixing the above three concentrated solutions in proportion, and conducting drying into powder to obtain the special peptone for fermentation production of inosine. The peptone prepared by the method is reasonable in molecular weight distribution, effectively controls a strain fermentation metabolism speed while promoting mass propagation and growth of strains, prolongs inosine synthesis time, increases inosine yield, and lays an important foundation for large-scale inosine fermentation production.

The invention provides an alkyd resin preparation method and a resin prepared by the same, and an acrylic acid modified alkyd resin preparation method and a resin prepared by the same. According to the alkyd resin preparation method, vegetable oil is used as a raw material, and unsaturated carboxylic acid and/or unsaturated anhydride are/is added step by step, so that the structure of the alkyd resin is improved. According to the preparation method of the acrylic acid modified alkyd resin, a unsaturated monomer is fed step by step, and the feeding time is controlled, so that the unsaturated monomer is uniformly grafted on an alkyd resin, and the molecular weight distribution is narrow. The acrylic acid modified alkyd resin prepared by the preparation method is applied to water-based coating materials, so that a paint film has the advantages of high drying speed, high glossiness, good fullness, low VOC emission, excellent comprehensive performance and the like.