4230results about How to "Small molecular weight" patented technology

The invention discloses a temperature resistant salt tolerant high efficiency gel and a preparation method and application thereof. The preparation method is characterized in that the preparation method comprises the following steps: preparing a comb-shaped associated copolymer PAH containing macromonomers and functional hydrophobic monomers into an aqueous solution having the concentration of 0.1 to 4g/L, the crosslinking agent concentration of 0.01 to 1.0g/L, the surfactant concentration of 0.01 to 8mmol/L and the sodium sulfite thermal stabilizer concentration of 0.005 to 1.0g/L; adding the aqueous solution into a mixing container with a stirring device; stirring the aqueous solution evenly at the room temperature; regulating the pH value of the solution to be equal to between 4 and 11, and obtaining a temperature resistant salt tolerant high efficiency gel polymer solution system used for tertiary oil recovery and scavenge, displacement modification, profile modification or water shutoff. The polymer solution system has micro-crosslinking to form the gel during the flowage inside the oil reservoir. The gel has good elasticity, not easy dehydration, stable gelling performance, and excellent tackification, temperature resistance, salt tolerance, shearing resistance and ageing resistance.

A thermal decomposition apparatus for decomposing polymer waste is provided which is simple in structure, small in size and inexpensive, and also the operating cost thereof is low. A feed pipe 18 and an inclined pipe 23 are connected in the form of the letter V at a large angle therebetween, and a feed screw 19 and an feed-up screw 25 are arranged inside the respective pipes. Polymer waste introduced into a hopper 17 is melted in the interior of the feed pipe 18 by heat from a first hot air furnace 10 and accumulated in the V-shaped portion. The polymer melt is then conveyed upward by the feed-up screw 25. In the process of conveyance, the polymer melt undergoes primary decomposition by means of heat from a second hot air furnace 11 and the cracked gas thus generated undergoes secondary decomposition by the heat from a third hot air furnace 12, the resultant gas being guided to a condenser 7. Sludge drops down through a chute pipe 35 into a water tank 36.

The present invention discloses a manufacture method of a tissue frame, which conducts the selective laser sintering by the polymer micro spheres. The method comprises the following steps. The polymer material dissolved in the solvent is dropped in the dispersant under stirring status at a uniform speed. The polymer micro spheres are obtained after cleaning, ultrasound dispersion and freezing preparation. The mixing powder is obtained after mixing the polymer micro spheres with a pore-foaming agent. A three-dimensional model of the frame is designed by the computer assistant software. The mixing powder is formed by the selective laser sintering according to the three-dimensional model; therefore the frame is produced. The polymer micro spheres produced by the method in the present invention have regular shapes and adjustable particle diameter. The method is simple and practical. The mechanical property of the frame after forming is excellent. The horizontal movement between the layers is small and the forming accuracy is high.

The invention discloses an ethylene propylene diene rubber composition and a preparation method. The preparation method comprises the following steps of: firstly, performing after plastication on ethylene propylene diene rubber; then, adding zinc oxide, stearic acid, anti-aging agent, carbon black, plasticizers, accelerant, vulcanizer and the like in sequence; evenly mixing and then extruding a sheet; and preparing the sheet into the ethylene propylene diene rubber/carbon black nanometer composite material by adopting the after vulcanization process. Through adding various plasticizers and adopting special process treatment, the tensile strength of the ethylene propylene diene rubber composition disclosed by the invention is at least 15.2MPa, the elongation at break is at least 400 percent, and the compression set is lower than 30 percent under the condition of 125 DEG C*70h. The composite material can be used as a sealing article of rubber, especially a rubber sealing washer applied to a groove-type pipeline joint part of an automatic water spray fire extinguishing system, and thereby, a long-term sealing effect is ensured.

The invention discloses a high-performance recycled PET/ABS alloy. The alloy comprises the following components in percentage by weight: 30 to 80 percent of recycled PET, 10 to 50 percent of ABS, 1 to 10 percent of reinforcing agent, 2 to 15 percent of compatilizer, 0.5 to 5 percent of flexibilizer, 0.5 to 3 percent of polyhydroxy chemical coupling agent, and 0.1 to 1 percent of antioxidant. The alloy can improve a recycled PET system by using reasonable matching of additives, effects of the polyhydroxy chemical coupling agent, and excellent physical mechanic properties of an ABS system. Therefore, the recycled PET /ABS alloy has the advantages of high compatibility, high tensile strength, high mobility, good machinability and the like, is particularly suitable for producing complicated components and parts and large plates, has a simple process, is suitable for mass production of medium-sized and small enterprises, and has obvious economic benefit and social benefit.

It is to provide a block copolymer that can form a microphase separation structure even with a small molecular size, and that can form a microphase separation structure with a small domain size.

It is a block copolymer represented by the formula A-C-B (wherein A represents a segment which is a homopolymer or random or block copolymer consisting of at least 1 kind or repeat units represented by formula (II);

B represents a segment which is a homopolymer, or random or block copolymer consisting of at least 1 kind of repeat units represented by formula (III);

C represents A, B or A-B; however, at least 1 segment of each

A has a water-repellent group, or at least 1 segment of each B has a polar group); which block copolymer has a mass average molecular weight of 50,000 or less, and that can form a microphase separation structure.

The invention discloses marine biological function cosmetics for minimizing pores. The marine biological function cosmetics for minimizing the pores are prepared by mixing and homogenizing main active ingredients and a cosmetic substrate, wherein the main active ingredients comprise marine shellfish active peptide, marine collagen protein peptide, seaweed polysaccharide and fish oil. Hyaluronic acid and vitamin C (Vc) are added, so that the effect is more obvious. The marine biological function cosmetics for minimizing the pores solve the problems that the conventional cosmetics for minimizing the pores have high irritation and short action time, the marine shellfish active peptide is not applied to cosmetics, the marine biological active substances are not applied to the cosmetics for minimizing the pores and the like. The marine biological function cosmetics for minimizing the pores are safe, mild, high-efficiency and durable, can minimize the pores from inside to outside, recover fineness, softness and smoothness, and enable skin to give out natural, clean and transparent gloss. The marine biological function cosmetics for minimizing the pores have various types, such as cream, emulsion, water agent, gel, spray or masks, have obvious and durable pore-minimizing effect and can serve as the common skin-care products or the cosmetics with the function of minimizing the pores. After the marine biological function cosmetics are not used, the pore bulky symptom is not rebounded.

The invention discloses a novel gene editing system which is established based on gene cas3 of an I-B type CRISPR-Cas system in a chromosome of Virginia streptomycete IBL14, the gene editing of an I type CRISPR-Cas system to a biological cell genome is realized for the first time, and new supplement and choice are provided for the gene editing system which is established by II type commercializedCas9. In the system, a target DNA can be specifically cut by the Cas3 through crRNA guide or t-DNA location. By adopting the system, error-free, simple and rapid gene editing can be performed on prokaryotic and eukaryotic genomes. The optimized gene editing system is expected to be superior to the commercialized gene editing system which is established based on Cas9 in multiple fields due to low molecular weight and ability to be guided by DNA.

The invention belongs to the technical field of treatment of high concentration organic waste water, and particularly relates to a method for degrading nitrobenzene waste water by a polyphase electrocatalytic oxidation process. The invention solves the problems of high cost and long time consumption in the traditional nitrobenzene waste water methods, low efficiency and high energy consumption in the electrolytic process, high oxidant consumption, high cost and the like in the Fenton process in the prior art for treating high concentration nitrobenzene water waste. The invention mainly adopts the catalytic oxidation action of transition metal catalysts in the electric field, and combines the Fenton process, thereby effectively degrading the high concentration nitrobenzene waste water. The method comprises the following steps that: (1) heterocatalytic reagents (solid catalysts) and particle electrodes, mainly including active carbon, and transition metal oxides and salts, are used for avoiding economic loss and secondary pollution to the environment, which are caused by catalyst loss in heterocatalytic oxidation; (2) under the condition of low pH value of the waste water in cooperation with Fe2+ with strong reducibility, a coupling reactor composed of an electrolysis field and oxidation reaction is used for generating chain reaction for generating an OH hydroxyl free radical, and the OH hydroxyl free radical can carrying out nonselective oxidization on organic substances, thereby finally oxidizing organic pollutants into carbon dioxide and water; (3) by using electric energy as an excitation energy and using cheap air as raw material, nitrobenzene substances in waste water are efficiently degraded under the coupling action of the polyphase electrocatalytic oxidation process and the Fenton process; (4) and the reactor is composed of a direct current regulated power supply, a feed electrode and an electrolytic bath.

The invention relates to strong-hydrophobic porous carbon nanofiber and a preparation method thereof, and belongs to the technical field of porous carbon fiber. The preparation method comprises the following steps: adding thermosetting phenol resin and high molecular weight linear polymers into organic solvent with two proportions to be mixed until the thermosetting phenol resin and the high molecular weight linear polymers are fully dissolved, performing electrostatic spinning on the solution to form phenolic resin fiber, and carrying out curing and carbonizing to obtain the hydrophobic porous carbon nanofiber. The porous carbon nanofiber and the preparation method have the advantages as follows: the diameter, the pore structure and the hydrophobicity of the fiber can be adjusted and controlled through the change of the proportions of the solvent, the prepared carbon nanofiber has good flexibility, a developed pore structure and strong hydrophobicity, and is more conductive to practical application.

The invention relates to a maize oligopeptide and a method for preparing same, belonging to the field of biological technology. The method takes the byproduct, namely corn protein powder (also called maize yellow powder containing about 60% of protein) in corn starch production as a raw material, removes the impurities such as starch, grease and the like by the treatment of alkaline water and obtains high-purity corn protein slag; furthermore, the corn protein slag is taken as enzymatic hydrolysis substrate and treated by the following process of pre-treatment, enzymatic hydrolysis, multi-step separation and purification, concentrating, drying and the like so as to prepare the maize oligopeptide powders with edible value and various health-care functions. The method for preparing maize oligopeptide has the advantages of easily obtaining raw material, simple process and higher industrial feasibility. The prepared maize oligopeptide sample has high crude protein content and small molecular weight, has various physiological activities of prompting immunity adjustment, anti-fatigue and the like, and can be used as new functional nutritional compounding and widely applied to the development and production of products such as foods, health-care foods and the like.

PCT No. PCT/JP96/03677 Sec. 371 Date Jun. 18, 1998 Sec. 102(e) Date Jun. 18, 1998 PCT Filed Dec. 17, 1996 PCT Pub. No. WO97/22405 PCT Pub. Date Jun. 26, 1997A hollow fiber filter membrane where the inner surface comprises a three-dimensional network structure having thick trunks of 10-30 mu m in maximum diameter and the average pore diameter of a minimum pore diameter layer of the membrane is 0.01 mu m or more and less than 1 mu m.

The invention relates to a filament low-melting-point polyester fiber and a preparation method thereof. The filament low-melting-point polyester fiber is in a skin-core structure, a skin layer is made of low-melting-point polyester; a core layer is made of PET (polyethylene terephthalate); the low-melting-point polyester consists of a terephthalic acid chain segment, an isophthalic acid chain segment, an ethylene glycol chain segment, a diethylene glycol chain segment, a molecular weight modifier chain segment and a 1, 12-Dodecanediol chain segment containing branched chains; a molecular weight modifier corresponding to the molecular weight modifier chain segment is specifically a monoacid series or a diacid series; the preparation method of the filament low-melting-point polyester fiber comprises the following steps: polymerization of the low-melting-point polyester and skin-core composite spinning, so as to obtain the filament low-melting-point polyester fiber. The prepared filament low-melting-point polyester fiber has the advantages that the initial melting point is reduced, the melting speed is increased, the polyester fiber is immediately melted at the corresponding temperature, and the melting effect is good.

A method of producing a healthcare yang-invigorating preparation for males is provided. The method is characterized in that: male silkworm pupa-cordyceps militaris-oyster peptides prepared by subjecting raw materials including male silkworm pupae, cordyceps militaris (L.) Link and oyster to enzymolysis, a composite extract prepared from mulberry fruit, barbary wolfberry fruit, palmleaf raspberry fruit, solomonseal rhizome, common yam rhizome, gordon euryale seed, poria, jujube kernels, cortex cinnamomi, Chinese date and ginseng and broken pine pollen prepared from pine pollen are added and fully mixed, an excipient is added into the mixture and the mixture is prepared into granules, capsules, and a tablet candy preparation according to conventional preparing processes. Compatibility of components adopted is scientific. An adopted preparing process is unique and simple. According to the method and the preparation, a production process is simple, the preparation is simple to eat, has effects of tonifying the kidney and qi, tonifying the lung and kidney, promoting sperm production, boosting marrow, invigorating the spleen and the stomach, improving microcirculation of human bodies, eliminating moisture, removing paralysis, boosting immunity, preventing fatigue, resisting viruses, strengthening bodies, invigorating yang and treating impotence, has obvious curative effects, mild functions and no side or toxic effects, and is an ideal healthcare yang-invigorating preparation for males.

A high-solid polyester paint of coiled material and metallic plate is composed of polyester resina s filming substance, cross-linking agent, pigment, solvent and assistant. Its advantages are high solid content, low viscosity, and balanced flexibility and hardness.

The invention relates to a nucleic acid aptamer which is in high-specificity and high-affinity combination with aflatoxin B1 and application thereof. The nucleic acid aptamer can be used for detection analysis and separating enrichment of aflatoxin B1, and has the advantages of being good in specificity, high in affinity, homogeneous in quality, good in stability, short in development cycle, low in production cost and convenient to use. The invention further relates to derivation sequences of a nucleic acid aptamer sequence and comprises sequences after modification.

The invention provides a simple and convenient Agrobacterium Tumefacies dual carrier containing double T-DNA structural regions, and a method of using the carrier system to cultivate transgenic rice without resistance selection label. With the help of the principle of co-conversion mediated by root nodule Agrobacterium Tumefacies, the system contains two separate T-DNA structural sections, where the first T-DNA region contains antibiotic resistance selection label gene and the second one contains a universal polyclonal site able to be arbitrarily inserted with destination gene. The double-T-DNA carrier has small molecular weight, easy to clone and after the destination gene and necessary regulation and control series are cloned in the T-DNA region containing the polyclonal site, it realizes rice co-conversion; by selfing, it selects transgenic individual with destination gene but without selectin label gene from the self-bred progeny, thus eliminating the negative effect on transgenic plant commercialized production, etc, possibly caused by selection label gene.

A protoporphyrinogen oxidase tolerant to photobleaching herbicide and derivatives thereof, comprising a polypeptide having the amino acid sequence represented by SEQ ID No. 2 or mutated peptides derived therefrom by deletion, addition, substitution, etc. of one or more amino acids in the above amino acid sequence and having an activity substantially equivalent to that of the protoporphyrinogen oxidase. The acquisition of the novel protoporphyrinogen oxidase, which is highly tolerant to photobleaching herbicide and originates in plant, make it possible to construct plants highly tolerant to photobleaching herbicide via the expression of this enzyme in host plants.