60results about How to "Appropriate molecular weight" patented technology

The invention relates to a thermosetting resin compound. The thermosetting resin compound is characterized in that a thermosetting polyphenyl ether resin with styrene groups and acryl reaction functional groups (at ratio of 0.5-1.5) on terminals, a thermosetting polybutadiene resin and at least one thermoplastic resin are used for adjusting heat resistance, fluidity and rubber-filling property; various peroxides with different half-life period temperatures are used for compounding a combined type crosslinking initiator, so that the crosslinking density can be effectively promoted during heat curing process; other components, such as crosslinking agent, are combined for forming the compound, so that the compound after hardening has the characteristics of low dielectric constant, low dielectric loss, high Tg, high rigidity, excellent cutting property of Prepreg, and the like.

The invention discloses a chlorinated alkyl polyphosphate flame retardant and a synthesis process thereof. The flame retardant is an intermediate formed by reacting phosphorus oxychloride and diethylene glycol as raw materials, and the intermediate is then combined with epoxy Propane reacts under the condition of catalyst, synthesizes and obtains the product of the present invention; The advantage of the present invention is: technique is simple, and reaction process is easy to control, and the synthetic chloroalkyl polyphosphate is mainly used as rubber, polyurethane, artificial fiber, artificial leather etc. The flame retardant of the material has stable flame retardant performance. It can be used as a flame retardant, a stabilizer, a flame retardant plasticizer, and a crosslinking agent.

The invention discloses a method for preparing microorganism-dedicated soybean protein isolate. The method comprises the following steps: soaking low-temperature degreased soybean meal in an alkali solution with a pH value of 9.5 to 10.0 at a temperature of 50 to 55 DEG C, adjusting the pH value to 6.8 to 7.4, the sugar content to 8.0 to 9.0, stirring for 40 to 60min, and performing solid-liquid separation to obtain a crude protein extracting solution; adding an acid solution into the crude protein extracting solution at room temperature, stirring for 10 to 50min, and centrifuging to obtain acid-precipitated protein; dissolving the acid-precipitated protein in water at room temperature, adjusting the pH value to 6.00 to 6.30 and the sugar content to 18.0 to 19.5 to obtain an acid-precipitated protein solution; adding neutral protease and alkaline protease, reacting at 50 to 60 DEG C for 0.5 to 3h to obtain enzymatic hydrolysate; performing sterilization, flash treatment and spray drying to obtain the microorganism-dedicated soybean protein isolate. The soybean protein isolate prepared according to the invention has good dispersibility, low viscosity and suitable amino acid nitrogen, and has the advantages of simple process, easy operation, strong protein practicability, wide application in fermentation industry and better popularization value.

2-aminothiazole derivatives represented by formula (I), where R₁ and R₂ represent cycloalkyls, respectively; or R₁ represents a substituted aromatic group, and R₂ represents H, a C₁-C₁₁ alkyl, —CH₂Ph (benzyl), or a methyl ether including a C₁-C₁₁ alkyl. R₃ is a substituent including an amino group. X represents a carbonyl or a methylene and n is an integer from 0 to 5.

The invention relates to a compatilizer for a cellulose material reinforced composite material and a preparation method for the compatilizer, and belongs to the technical field of high polymer material modification. A reaction interface compatilizer is prepared by cografting acrylate monomers, styrene, an initiator, polyolefin, a bonding agent and the like on the polyolefin through a solid-phase grafting method. The compatilizer has the advantages that the grafting ratio of functional monomers on a polymer substrate main chain is high, the functional monomers can form covalent bonds with hydroxyl on the surface of a cellulose material efficiently, and the dispersibility of the cellulose material in a plastic substrate is promoted; meanwhile, the macromolecular main chain has proper molecular weight, can be subjected to chain entanglement with the plastic substrate in the composite material to improve the compatibility, has high melting fluidity, can effectively infiltrate the composite material during processing, is closely meshed at the interface to form an interface layer for effectively transmitting stress and effectively relieves fine cracks generated due to deformation of the material, the mechanical properties and water resistance of the composite material are improved, and the application range of the composite material in various fields is widened.

This invention relates to a novel phosphorus-containing phenol novolac resin, use of the phosphorus-containing phenol novolac resin as a halogen-free flame retardant epoxy hardener, and an epoxy resin composition having high phosphorus content because it includes the phosphorus-containing phenol novolac resin, thereby exhibiting superior flame retardancy and heat resistance.

The invention discloses a carbon black masterbatch rubber composition for tires and a preparation method thereof. The rubber composition contains 100 parts of main rubber and 0.5-3 parts of sulfurizing reagent, wherein the main rubber comprises carbon black masterbatch and diene rubber; the carbon black masterbatch is prepared by the following steps: dispersing carbon black in deionized water to form carbon black slurry, uniformly mixing with nano silicon dioxide/polymerized conjugated dialkene graft modified rubber latex, and condensing; nano silicon dioxide/polymerized conjugated dialkene function compound emulsion contains 0.1-5 parts of surface functional modified nano silicon dioxide based on 100 parts by mass of dry basis; the nano silicon dioxide/polymerized conjugated dialkene function compound emulsion has particle size of 50-80 nanometers, number-average molecular weight of 100000-140000 and molecular weight distribution of 2-3. The rubber composition has good abrasive resistance, good wet slip resistance, and low rolling resistance.

The invention relates to an organic electroluminescence material with a heterocyclic ring structure as well as a preparation method and application thereof. The structure formula of the organic electroluminescence material with the heterocyclic ring structure is shown in the description, wherein the R1 and the R2 are any one kind of materials from hydrogen, aromatic heterocyclic groups with the carbon atom number being 5 to 60 and polycyclic aromatic group conjugated structure groups with the carbon atom number being 5 to 60; the R1 and the R2 are identical or different. The organic electroluminescence material with the heterocyclic ring structure is obtained by using 3-bromofluoranthene, o-chloroaniline, o-chlorobromobenzene, halogenated reagents and boric acid compounds as raw materialsthrough coupling reaction under the effects of catalysts and basic substances. The material is applied to a luminescence layer in an organic electroluminescence device; crystallization and gathering cannot easily occur between material molecules; good film stability is realized. The organic electroluminescence material device prepared by the material has lower driving voltage and high current efficiency; good photoelectric performance is realized.

The invention belongs to the field of organic materials, and relates to a spiro compound and an application thereof, and an organic electroluminescent device and an electronic device using the spiro compound. The spiro compound has a structure represented by a formula 1 shown in the description: wherein the group A has a structure represented by a formula 2; and Ar2 is selected from a group consisting of structures shown as a formula a', a formula b', a formula c' and a formula d'. The spiro compound is used as a hole transport material and is applied to an OLED (Organic Light Emitting Diode)device, and a good device performance and relatively low voltage can be obtained.

An electrolyte membrane for a fuel cell includes a fluorine polymer electrolyte having a sulfonic acid group, and a copolymer which includes at least an aromatic ring and a cyclic imide that is condensed or not condensed with the aromatic ring, and in which an aromatic repeating unit having a structure in which the aromatic ring and the cyclic imide are bonded together directly or by only a single atom, is linked with a siloxane repeating unit having a structure that includes a siloxane structure.

The invention provides a preparation method of water soluble styrene-acrylic acid solid resin used for aluminium foil coating. The preparation method comprises the following steps of: firstly preparing an aliphatic carboxylic acid ethanol solution; secondly, mixing an aliphatic vinyl unsaturated monomer, an aliphatic unsaturated carboxylic acid monomer, a chain transfer agent, an initiator and an ester solvent to obtain a first pre-treatment solution; thirdly, heating and refluxing the ester solvent, then dropwise adding the first pre-treatment solution, and then adding the alphatic carboxylic acid ethanol solution, so as to obtain a base solution; fourthly, mixing an aromatic vinyl unsaturated monomer, an alphatic vinyl unsaturated monomer, a chain transfer agent, an initiator and an ester solvent to obtain a second pre-treatment solution; fifthly, heating and refluxing the base solution, then dropwise adding the second pre-treatment solution, so as to obtain a reaction solution; and sixthly, extracting, separating and drying, so that the water soluble styrene-acrylic acid solid resin used for the aluminium foil coating is obtained. By adopting the preparation method provided by the invention, pollution behaviours can be constrained, and production cost can be greatly reduced, so that the preparation method provided by the invention has a wide promotion value and high energy-saving efficiency.

The invention provides an organic compound, an electroluminescent material and application of the organic compound. The organic compound has a structure represented by formula I. Through the special design of a molecular structure and a substituent group, the organic compound has high triplet state energy level ET, high molecular density, high glass transition temperature and high molecular thermal stability, effectively improves the equilibrium migration of carriers, broadens an exciton recombination region, improves the light extraction efficiency, improves the luminous efficiency of an electroluminescent device and prolongs the service life of the electroluminescent device. The organic compound provided by the invention is highly suitable for being applied to a light-emitting layer of an OLED device, and the light-emitting efficiency, chromaticity and service life of the device can be remarkably improved.

The invention discloses a thread-meshed tissue holder which is made of an absorbable high polymer material. The thread-meshed tissue holder comprises a first clamping arm and a second clamping arm which are connected through an elastic hinge. The first clamping arm and the second clamping arm are each of an arc-shaped structure, and the radian of the first clamping arm and the radian of the secondclamping arm are matched. The inner wall face of the first clamping arm and the inner wall face of the second clamping arm are provided with thread-meshed components. When the clamping arms are clamped, thread sealing can be realized. Through the thread meshing of the first clamping arm and the second clamping arm compared with meshing of concave-convex structures of a tissue holder in the priorart, the tissue holder is large in shearing force, friction force is greatly improved, the deviation of the tissue holder can be effectively prevented, polylactic acid with a certain shrinking percentage is selected as an absorbable material, the friction coefficient of the tissue holder is increased, and slipping resistance is increased.

The invention relates to an oil-extended carbon-black-extended styrene-butadiene rubber master batch, and a rubber composition and a preparation method thereof. The oil-extended carbon-black-extended styrene-butadiene rubber master batch is prepared by mixing and condensing an extender oil, carbon black slurry and a silicon dioxide/poly-conjugated diene modified styrene-butadiene rubber latex, wherein the silicon dioxide/poly-conjugated diene modified styrene-butadiene rubber latex is prepared by blending a nano silicon dioxide/poly-conjugated diene functional composite emulsion and a styrene-butadiene rubber latex; and the functional composite emulsion introduces the nano silicon dioxide onto the molecular chain of the poly-conjugated diene. The rubber master batch and rubber composition disclosed by the invention greatly lower the generated heat when being used in tire treads, and have the comprehensive properties of excellent wet-road holding capacity and excellent abrasion resistance.

The invention belongs to the field of organic electroluminescent and particularly relates to a novel organic electroluminescent material containing pyrazine-ring as well as a preparation method and application thereof. The novel organic electroluminescent material containing pyrazine-ring provided by the invention has good film stability, suitable HOMO and LUMO energy level and good market and application prospect, can be used as a function layer of the small molecular electroluminescent device and applied to the field of organic electroluminescent.

The present invention relates to a polyimide precursor composition, a method for preparing a polyimide, and polyimide. The polyimide precursor composition contains polyamic acid and a monomeric compound. The polyamic acid is prepared from a monomer mixture by a first reaction, wherein the monomer mixture comprises a diamine compound and a dianhydride compound. The aforementioned monomeric compound has two carboxyl groups and two ester groups. The prepared polyimide precursor composition can be further reacted to obtain a polyimide having good mechanical properties and film properties.

The invention discloses liquid polybutadiene as well as a preparation method and application thereof. According to the liquid polybutadiene, the number-average molecular weight is 2500-5500, and the molecular weight distribution index is 1-1.2; on the basis of the total amount of the liquid polybutadiene, the content of a 1, 2-structural unit in the liquid polybutadiene is 85-95 wt%, the content of 1, 4-structural unit in the liquid polybutadiene is 5-15wt%, and the molar ratio of the cis-1, 4-structural unit to the trans-1, 4-structural unit in the liquid polybutadiene is (1-2): 1; and the dynamic viscosity of the liquid polybutadiene at 45 DEG C is 100-500P. The liquid polybutadiene disclosed by the invention has good flowing property, film-forming property and coating property, and a coating formed by the liquid polybutadienehas improved adhesive force to a base material.

The invention discloses novel water-resistant composite resin for impregnation of a laminated wood floor surface layer and a preparation method of the novel water-resistant composite resin. The novel water-resistant composite resin is prepared from the following raw materials in parts by weight: 300-400 parts of isocyanate, 100-200 parts of polyvinyl alcohol, 700-900 parts of melamino-formaldehyde resin, 8-10 parts of a catalyst and 2-5 parts of a surfactant. By accurately designing a resin formula, the isocyanate, the polyvinyl alcohol and the melamine formaldehyde resin are compounded together to form a new resin structure which comprises the structural characteristics of the three resins and has respective performance characteristics. The prepared novel water-resistant composite resin for impregnating the surface layer of the laminate flooring has the characteristics of high water-resistant bonding strength, high curing efficiency, good transparency of a cured adhesive layer, energy conservation and environmental protection.