222results about How to "Increase intermolecular forces" patented technology

The invention discloses a storable plant oil-based polyurethane wood adhesive. The adhesive is prepared from 20-50 percent by mass of plant oil polylol, 25-45 percent by mass of isocyanate, 0.01-0.1 percent by mass of catalyst and 5-35 percent by mass of solvent, is accordant with the developing trend of novel environmentally-friendly and low-carbon materials, has high storage performance, high cementing property, high water resistance and long storage life, can be cured at room temperature and can be applied to a wood adhesive. The invention also discloses a preparation method of the storable plant oil-based polyurethane wood adhesive. The preparation method has simple steps, low requirements of technological conditions and very high economic benefit, and contributes to industrial production.

The invention relates to the technical field of silicone rubber, and particularly relates to a ceramic fire-resistant and flame-retardant silicone rubber and a preparation method thereof. The ceramic fire-resistant and flame-retardant silicone rubber is composed of a component A and a component B in a weight ratio of 0.8-1.2: 1. The component A comprises the following raw materials in weight part: 60-140 parts of silicone rubber A, 35-45 parts of reinforcing agent, 60-100 parts of filler A, 11.4-17.2 parts of silane auxiliary agent A, 0.15-0.25 part of lubricant A, 0.1-0.3 part of flame retardant, and 0.5-1.5 parts of vulcanizing agent. The component B comprises the following raw materials in weight part: 60-140 parts of silicone rubber B, 230-290 parts of filler B, 3-6 parts of silane auxiliary agent B, and 0.2-0.4 part of lubricant B. According to the technical scheme of the invention, the ceramic fire-resistant and flame-retardant silicone rubber is good in fire-resistant and flame-retardant property, and excellent in comprehensive performance.

The invention discloses a high-hardness high-rebound polyurethane elastomer material and introduces an application thereof. The material is obtained by mixing an isocyanate component and a polyhydric alcohol component at the temperature of 25-40 DEG C according to the weight ratio of 100:(50-100), pouring into a mould of 40-60 DEG C and vulcanizing for 30-60min. The hardness is 86-93A, the rebound rate is greater than 70%, the abrasion is smaller than 20mg, the tensile strength is greater than 25MPa, and the tearing strength is greater than 100kN/m. The isocyanate component is a performed polymer with the content of 6-18% of isocyanic acid radicals, and the performed polymer is generated in such a way that 20-60% of PTMG with the molecular weight smaller than or equal to 1,000 and 40-80% of doped PTMG with the molecular weight greater than 1,000 react with isocyanate or a derivative thereof; the polyhydric alcohol component comprises 69.2-89.4% of PTMG with the average molecular weight greater than 1000, 10-30% of fatty group dihydric alcohol, 0.2-0.3% of catalyst and 0.4-0.5% of antiaging agent. The polyurethane elastomer material can be used for preparing butterfly boards, active boards, pulleys used for rapid slide, pulleys of ice skates, pulleys of sliding boards and various castors.

The invention discloses a vibrating diaphragm of a sound production device and a preparation method thereof and the sound production device. The vibrating diaphragm comprises at least one modified diaphragm layer, the modified diaphragm layer is made of a blend polymer formed by blending and modifying silicone rubber and a modifier, and the modifier is at least one of a butadiene-acrylonitrile copolymer, a butadiene-styrene copolymer, polysulfide rubber, polyurethane rubber and polybutadiene. The vibrating diaphragm provided by the invention is made of a blend polymer formed by blending and modifying silicon rubber and a modifier; the modifier is at least one of a butadiene-acrylonitrile copolymer, a butadiene-styrene copolymer, polysulfide rubber, polyurethane rubber and polybutadiene; the intermolecular force and/or steric hindrance of the silicone rubber can be increased, so that the vibrating diaphragm has excellent damping performance, and the sound production device has excellentconsistency, excellent anti-polarization capability, reduced distortion performance and higher tone quality in the vibration process.

The invention relates to a manufacturing method for a resin grinding wheel cutting piece with function of cutting soft and hard materials. In the method, a silicon carbide grinding material with different particle sizes, a brown aluminium oxide grinding material with mixed particle sizes, a phenolic resin binder, a polytetrafluoroethylene dry grinding lubricant and a cryolite packing material are prepared into a resin grinding wheel cutting piece bonding mixed grinding material; the resin grinding wheel cutting piece bonding mixed grinding material is coated on a grinding wheel net according to piece weight specification of the cutting piece; and the resin grinding wheel cutting piece is prepared by spreading and scraping the grinding material with a scraper blade, and pressurizing, molding and hardening the grinding material with a pressing plate. The silicon carbide grinding material and the brown aluminium oxide grinding material in an optimum proportion make the resin grinding wheel cutting piece play a decisive concordant role in cutting the soft and hard materials; and the polytetrafluoroethylene dry grinding lubricant is adopted to make the resin grinding wheel cutting piece have good balance in the aspects of cutting speed and cutting durability. Therefore, the manufacturing method comprehensively improves and expands functions and application of the resin grinding wheel cutting piece.

The invention belongs to the technical field of coal mine safety, and patricianly relates to multifunctional liquid foam used for an underground coal mine and a using method of the multifunctional liquid foam. The multifunctional liquid foam used for the underground coal mine comprises, by mass, 0.5-10% of crystal whisker stopping agents, 0.5-30% of quaternary ammonium salt cationic surface active agents, 0.5-30% of non-ionic surface active agents and 0-10% of additives, the balance of water. The multifunctional liquid foam preparation method and using method are simple, bring convenience for use and manual operation, and are strong in applicability because of being suitable for mines rich in acid gases like sulfuretted hydrogen and sulfur dioxide, tunnels with large coal spontaneous combustion tendency, mine working faces and the like and particularly suitable for mine goaves.

The invention relates to acrylonitrile-based polymethacrylimide foam which comprises the following components in parts by mass: 35-60 parts of methacrylic acid MAA, 40-65 parts of acrylonitrile AN, 0.10-4.0 parts of an initiator, 1.0-20 parts of a foaming agent, 1-5 parts of a nucleating agent, 0.1-5 parts of a crosslinking agent and 5-10 parts of a heat resisting additive, wherein the initiator is an azo compound or a mixture of the azo compound and a peroxide and the initiator at least comprises three different compounds at the same time; the azo compound is azobisisobutyronitrile AIBN, azobisisoamylonitrile or 2,2'-azobisisoheptonitrile; the peroxide is dibenzoyl peroxide, lauroyl peroxide, tert-butyl peroxyoctoate or tert-butyl peroxybenzoate. The acrylonitrile-based polymethacrylimide foam provided by the invention is good in heat resistance, high in heat deformation temperature which is greater than 220 DEG C and excellent in mechanical property.

The invention belongs to the field of luminescent materials, and relates to a rare earth metal organic framework material and a synthesis method thereof. The rare earth metal organic framework material is constructed with deprotoned 2,4,6-tris(4-carboxyphenyl)-1,3,5-triazine as ligands, with rare earth metal ions as luminescent centers by pi-pi interaction of the ligands or C-H-pi interaction of the ligands and a solvent. The distance between the centers of aromatic rings corresponding to the pi-pi interaction of the ligands is 5 Angstroms, the interaction of the ligand molecules is enhanced,the rigidity of a material skeleton is increased, the loss of energy on the skeleton is reduced, the energy transfer from the ligands to the rare earth metals is also enhanced, the energy utilizationefficiency is greatly enhanced, and thus high quantum yield is obtained. The luminescent metal organic frame material has high energy utilization rate, and the quantum yield of the luminescent metal organic frame material is increased from less than 60% to 99.9% compared with that of a conventional rare earth metal organic frame material.

The invention discloses a flame retardant anti-droplet copolyester based on a benzimidazole structure, and a preparation method thereof. The copolyester is composed of structural units represented byformula I, II, III or I, II and IV, the characteristic viscosity [eta] of the copolyester is 0.48-1.36 dL/g, and the limit oxygen index is 25.0-42.0%; the glass transition temperature of the copolyester is 7-62 DEG C higher than that of pure PET; the vertical burning grade is V-2 to V-0 grade; the peak heat release rate p-HRR in cone calorimetry test is 42.8-82.5% lower than that of the pure PET;and the total smoke release amount is 15.8-69.0% lower than that of the pure PET. The benzimidazole structure introduced in the invention can rapidly form a large amount of charcoal during combustionin order to achieve excellent flame retarding, droplet resisting and smoke suppressing effects, can maintain the original processing window of the polyester and realize multi-time repeated processing,and also can greatly improve the glass transition temperature of the copolyester; and the preparation method has the advantages of mature process, simplicity and convenience in operation, and high easiness in industrial production.

The invention relates to micropore polymethacrylimide foam with high thermal deformation temperature. The foam comprises, by mass, 35-60 parts of methacrylic acid (MAA), 65-40 parts of acrylonitrile, 0.10-4.0 parts of initiators, 1.0-20 parts of foaming agents, 1-5 parts of nucleating agents, 0.1-5 parts of cross-linking agents and 5-10 parts of heat-resisting additives; the initiators are azo-bis(4-cyano valeric acid) or mixtures of azo-bis(4-cyano valeric acid) and other azo compounds. The other azo compounds are azodiisobutyronitrile AIBN, azobisisovaleronitrile or azobisisoheptonitrile. According to the micropore polymethacrylimide foam high in thermal deformation temperature, the foam has the small pore diameter phi of 0.1-0.3 mm, thermal resistance is high, the thermal deformation temperature is high and is larger than 200 DEG C, and the mechanical property is excellent.

The invention relates to the field of plastic raw materials and particularly relates to a PC/ABS composite based on basalt fiber reinforcement and a preparation method thereof. The PC/ABS composite based on basalt fiber reinforcement comprises the following components in parts by weight: 45-55 parts of PC, 15-25 parts of ABS, 10-20 parts of basalt fiber, 3-8 parts of a toughening agent, 1-2 parts of a lubricant, 1-2 parts of a coupling agent, 2-6 parts of a compatilizer, 5-10 parts of a flame retardant, 1-4 parts of a flame retardant synergist and 0.1-1 part of an antioxidant. The PC/ABS composite provided by the invention has the advantages of high bending strength, high tensile strength, good impact strength, good flame retardance and safety and environmental friendliness.

The invention discloses a thermal insulation coating for building external walls. The thermal insulation coating is prepared from the following raw materials in parts by weight: 50-60 parts of modified polyurethane, 30-36 parts of modified composite aerogel, 8-12 parts of floating beads, 1.5-2 parts of rutile titanium dioxide, 1.5-2 parts of silicon carbide, 2-3 parts of mirabilite and 0.6-1 partof an auxiliary agent. The invention also discloses a preparation method of the coating. By adding the composite aerogel, the microporosity in the coating can be greatly improved, and the heat conduction path can be prolonged; besides, the rutile type titanium dioxide and the silicon carbide capable of reflecting radiant heat are introduced to block a propagation path of radiant heat conduction, and a phase change energy storage material mirabilite is introduced, so that the overall performance of the thermal insulation coating can be effectively improved in the coating; by starting from threepaths (conduction, radiation and convection) of heat transfer, the coating has excellent heat preservation and insulation performance; the film-forming substance can endow the paint with favorable antibacterial, mildew-proof and waterproof properties, and the obtained thermal insulation coating is suitable for building exterior walls.

The invention relates to a multi-cyandiamine monomer and preparation and application thereof, and belongs to the technical field of polymer materials and synthesis thereof. The multi-cyandiamine monomer includes tricyandiamine monomers and tetrocyandiamine monomers. The multi-cyandiamine monomer is polymerized with anhydride to obtain polyimide. Various multi-cyanpolyimide polymers are obtained by chemistry ring-closure and heat ring-closure methods. The polyimide polymer is dissolved in a solvent and a plate coating method is used for paving a film to obtain a desired polyimide film material. The multi-cyanpolyimide material of the invention possesses high thermal stability, excellent film-forming property and excellent adsorbability and dimension stability caused by microscopic intermolecular interaction. The cyan can also be introduced to a sulfonate polyimide material to enhance intermolecular forces between main chains, reduce a swelling coefficient of the sulfonate polyimide material, and enhance dimension stability of the film material which can be used as a proton conduction film material for a fuel cell.

The invention relates to the field of new material preparation, and concretely relates to polymethacrylimide foam with uniform pores and a preparation method thereof and a product thereof. The methodis capable of mixing (methyl)acrylic acid, (methyl)acrylonitrile, a third comonomer, an initiator, a foaming agent, a crosslinking agent, a nucleating agent, and a zinc-copper-doped high temperature-resistant surfactant, and performing a reaction to obtain a transparent prepolymer; the transparent prepolymer is heat-treated, and the polymethacrylimide foam having uniform pores is obtained. The surfactant used in the method does not affect the reaction, so the original preparation process does not need to be changed, and the method is simple and convenient; different active agent amounts can beselected according to different foaming temperatures, or complex formulation is carried out, the surface tension during foaming can be regulated and controlled to prepare pore sizes with different sizes, and fine and uniform pores can be obtained; the introduction of atoms such as fluorine and silicon can increase the intermolecular force, and the heat resistance of the material can be increasedat a certain extent.

The invention discloses a preparation method of silica gel with high flame retardant rating. The silica gel with high flame retardant rating is prepared by mixing the following raw materials in parts: a raw material A: methyl vinyl silicon rubber; a raw material B: methyl vinyl silicon rubber; a raw material C: precipitated silica; a raw material D: hydroxyl silicon oil; a raw material E: dimethyl diethoxy silane; a raw material F: zinc stearate; a raw material G: stearic acid; a raw material H: methyl silicone oil; a raw material I: aluminum hydroxide; a raw material J: zinc stannate; a raw material K: vinyl trimethoxy silane; a raw material L: platinum water; a raw material M: benzotriazole; a raw material N: ferric oxide; a raw material P: magnesium oxide; and a few of raw material Q: curing agent. The silica gel raw material prepared by mixing the raw materials is excellent in flame retardant performance which can reach 5VB and 5VA of UL94 flame retardant rating.

The invention discloses an efficient non-toxic rare earth calcium-zinc stabilizer which comprises the following components in parts by weight: 10-15 parts of lanthanum citrate, 33-36 parts of calcium stearate, 8-13 parts of zinc stearate, 7-11 parts of epoxidized soybean oil, 28-31 parts of layered bihydroxy composite metal oxide (LDH) and 3-7 parts of stearoyl benzoyl methane. The production method comprises the following steps: A, sequentially adding and adequately stirring lanthanum citrate, calcium stearate, zinc stearate, epoxidized soybean oil, layered bihydroxy composite metal oxide (LDH) and stearoyl benzoyl methane; B, weighing the epoxidized soybean oil and uniformly spraying the epoxidized soybean oil into a solid powder mixture being stirred; and C, after spraying the epoxidized soybean oil, further stirring for 5-10 minutes. The stabilizer does not contain heavy metals such as lead, and is non-toxic and harmful, very environment-friendly, lower in cost and good in stability, mobility and compatibility.

The invention discloses high-performance bio-based composite film and a preparation method thereof, and belongs to the technical field of functional materials. The method mainly adopts polylactic acidas matrix, and uses cellulose nanocrystal as a reinforcing filler, composite fiber film is prepared by an electrospinning method, the addition of the cellulose nanocrystals can increase the storage modulus of the composite film by up to 500%, after water is absorbed, the storage modulus can be increased by up to 900%, the storage modulus of the composite film is obviously improved, pores are larger, cells can be effectively adsorbed and grown on the fiber film, the mechanical strength is also improved, and the addition of the the cellulose nanocrystals further broadens the application of polylactic acid in the field of biomedicine. The method uses an acid hydrolysis method to prepare the cellulose nanocrystals, cellulose raw material sources are wide, the acid hydrolysis method is simpleand easy to operate, and a product price is low. The film functions as a medical stent to promote drug absorption and cell growth.

The invention provides amorphous polyaryletherketone/sulfone powder for laser sintering and a preparation method of the amorphous polyaryletherketone/sulfone powder, and belongs to the technical fieldof additive manufacturing. The method comprises the following steps: dissolving amorphous PEKN/sulfone resin coarse powder in a solvent, blending with water, a stabilizer and an emulsifier in a reaction container, and stirring at a high speed at 40-50 DEG C to form an emulsion; heating to 90-95 DEG C in a gradient manner, and evaporating to remove the solvent; and cooling to room temperature, filtering, washing with water and drying to obtain the amorphous polyaryletherketone/sulfone powder for laser sintering. The amorphous polyaryletherketone/sulfone laser sintering powder material which ishigh in sphericity degree, uniform and controllable in particle size and good in fluidity is prepared through a solvent emulsification method.

The invention discloses photosensitive developed special line transfer glue for a sapphire glass base material and a preparation method thereof. The photosensitive developed special line transfer glueis prepared from an acrylic ester active monomer, a photoinitiator, an acrylic acid phosphate assistant, a silane coupling agent, polyester acrylate, and urethane acrylate. The transfer glue does notcontain an organic solvent, and is environmentally friendly. A transfer technology is used as the foundation, and the advantages of a photosensitive developing technology are organically fused, the advantages are adopted and the defects are avoided. Especially, a product of the transfer glue not only can use the organic solvent for developing, but also can use pure water for developing, and is environmentally friendly, non-inflammable and non-explosible, and is a future tendency. The transfer glue has the excellent properties of solvent corrosion resistance, cold and thermal shock resistanceand the like after curing, and an adhesive force of a glue layer and the sapphire glass base material is excellent, especially, the adhesive force of the glue layer and the sapphire glass base material is greater than or equal to 4B after a water boiling test. The transfer glue is capable of solving problems of current UV glue that the adhesive force on the sapphire glass base material is poor, the water boiling is not resistant, and the solvent is not resistant.

The invention discloses a preparation method of heat-resistant polyimide molding powder containing a benzimidazole structure. The preparation method comprises the following steps: synthesizing poly(amic acid) with higher molecular weight from a diamine monomer containing a benzimidazole structure and an aromatic dianhydride monomer in an aprotic solvent, adding a catalyst and a dehydrating agent into the poly(amic acid), settling, washing and drying to obtain the heat-resistant polyimide molding powder containing the benzimidazole structure. The polyimide prepared by the preparation method disclosed by the invention not only has excellent thermal stability, but also has good solubility and excellent comprehensive performance.

The invention discloses a flame-retardant corrosion-resistant polyurethane coating material, which comprises the following raw materials in parts by weight: 75-85 parts of polyurethane prepolymer, 15-25 parts of alkyd resin, 2-5 parts of dimethyl silicone oil, 2-5 parts of epoxy resin, 1-3.8 parts of perfluorooctanol, 0.5-1.5 parts of graphene oxide, 2-3.8 parts of nano boron carbide, 1-5 parts ofbentonite, 0.3-1.5 parts of trimethylolpropane, 0.5-1.3 parts of dipropylene glycol, 2-3 parts of paraxylene, 3-7 parts of ethyl acetate, 0.1-1 part of a silane coupling agent and 2-3.9 parts of plasticizers. The polyurethane prepolymer is prepared from diisocyanate, phosphorus-modified glycol and polyoxypropylene glycol as raw materials. The flame-retardant corrosion-resistant polyurethane coating material has high adhesive force with a basal body, good flame retardancy and excellent corrosion resistance.