35results about How to "Moderate crosslink density" patented technology

A low-modulus silicone sealant for the expansion joint of express way, airport runway, tunnel, bridge, etc is prepared from alpha, omega-dihydroxy polydimethyl siloxane and filler through proportionally vacuum kneading at 80-150 deg.C while dewatering for 30-300 min, high-speed stirring while cooling to obtain basic material, proportionally mixing chain enlarging agent, cross-linking agent, thixotropic agent, polydimethyl siloxane and toluent diisocyanate, stirring, and vacuum reaction at 20-600 rpm for 30-90 min.

The invention belongs to the technical field of polyurethane elastomers, and discloses a low-hardness solvent-resistant antistatic polyurethane elastomer as well as a preparation method and application thereof. The low-hardness solvent-resistant antistatic polyurethane elastomer contains the following components in parts by weight: 100 parts of polyurethane preformed polymer and 50-150 parts of polymer containing active hydrogen. The hardness of the low-hardness solvent-resistant antistatic polyurethane elastomer can be low to Shore 0A, and the low-hardness solvent-resistant antistatic polyurethane elastomer is good in mechanical strength, has extremely good tolerance to a ketone or ester polar solvent, and by adding an antistatic agent, the surface resistance of a product can be controlled to be less than or equal to 108ohm, so that the low-hardness solvent-resistant antistatic polyurethane elastomer can be widely applied to the antistatic field requiring solvent resistance, particularly applied to printing rollers.

The invention relates to high-deformation thermosetting shape memory resin based on bismaleimide and a preparation method thereof. The method includes the following steps that the bismaleimide and 1,6-ethanthiol are added into m-cresol to form a solution; triethylamine is added into the solution dropwisely, and under the protection of N2 and a stirring condition, a reaction is carried out at roomtemperature to obtain a linear oligomer; the bismaleimide, the linear oligomer and O,O'-diallylbisphenol A are mixed by mass, and the reaction is carried out at 130-150 DEG C for 25-45 min to obtain aprepolymer; the prepolymer is subjected to vacuum defoamation at the temperature of 130-150 DEG C, and through solidification and post-treatment, the thermosetting shape memory resin based on the bismaleimide is obtained. Compared with the prior art, the resin has a high deformation capability, and the breaking elongation of the resin at programming temperatures is higher than 30%; moreover, thethermosetting resin has both high glass-transition temperature (larger than 131 DEG C) and initial decomposition temperature (larger than 370 DEG C), high tenacity and outstanding shape memory performance.

The invention relates to a polyimide adhesive and a preparation method thereof and belongs to the technical field of adhesives. The polyimide adhesive solves the problem that the polyimide adhesive ata temperature of greater than 350 DEG C has poor thermal instability and low adhesive properties. The polyimide adhesive is prepared from a polyimide adhesive prepolymer through curing. The preparation raw materials of the polyimide adhesive prepolymer comprise aromatic diamine containing a biphenyl structure, aromatic diamine containing a siloxane structure, aromatic dianhydride and a blocking agent. The preparation method comprises dissolving the polyimide adhesive prepolymer in an organic solvent to obtain a homogeneous solution, coating the surface of the adherend with the homogeneous solution, removing the organic solvent, carrying out curing to obtain the polyimide adhesive and bonding the adherend The polyimide adhesive can be used for the bonding of high temperature resistant parts in the fields of aviation, aerospace, precision machinery and petrochemical industry.

The invention discloses a preparation method of a wear-resistant, heat-insulation and corrosion-resistant powder coating. The powder coating is prepared from the following raw materials: benzoxazine resin, epoxy resin, chlorinated polyether, carboxylated-terminated acrylonitrile-polybutadiene rubber, a curing agent, barite powder and wollastonite powder. The wear-resistant, heat-insulation and corrosion-resistant powder coating can be prepared by processes such as melting, mixing and extruding, cooling for tabletting, crushing and sieving and has excellent wear and corrosion resistance and heat insulation properties, the surface of a processed coating meets the national and industrial standards on the aspects such as adhesive force, flexibility, impact strength, smoothness, hardness and chemical resistance, and the wear-resistant, heat-insulation and corrosion-resistant powder coating is low in curing temperature, convenient to use and capable of reducing the cost.

The invention discloses a UV-ultra-matte skin-feeling surface coating method and a surface coating applied to woodware coating, a conventional UV roller coating process is adopted for bottom coating, a UV-ultra-matte skin-feeling surface coating process is adopted for surface coating, and specifically, special excimer equipment laser roller equipment is adopted for roller coating by adopting the UV-ultra-matte skin-feeling surface coating. The UV-ultra-matte skin-feeling coating is prepared from special raw materials through compatibility of the materials, and then the effects of extinction and skin feeling are achieved in cooperation with special excimer equipment and process. According to the UV-ultra-matte skin-touch coating, in the aspect of selection of UV resin, resin with good elasticity, moderate crosslinking density and good surface curing is selected, the resin can provide a soft framework, meanwhile, the surface curing is good, special excimer curing equipment is matched, after a paint film is cured by an excimer lamp, wrinkled textures are formed on the surface to obtain ultra-matte, the addition amount of matte powder is reduced, and the skin-touch effect is good. The hand feeling of a paint film is greatly improved, and the leveling property of a paint surface is excellent.

The invention provides a fluorine release film and a preparation method thereof. The fluorine release film comprises a base material layer, an antistatic coating and a fluorine release coating, wherein the antistatic coating and the fluorine release coating are respectively formed by coating an antistatic coating material and a fluorine release coating material. According to the invention, the binding force among the base material layer, the antistatic coating and the fluorine release coating is high, and the fluorine release film has good release force and high-temperature release force whilemaintaining the excellent properties of PET.

The invention discloses a high-performance glass fiber coating and a preparation method thereof and aims to solve the technical problems of poor alkaline resistance and poor storage stability of the conventional urea-formaldehyde resin coating. The glass fiber coating comprises raw materials in parts by mass as follows: 40-70 parts of water, 20-30 parts of acrylic monomers, 1-5 parts of acrylic functional monomers, 10-30 parts of a modified urea-formaldehyde resin adhesive, 0.5-5 parts of a polymerization stabilizer, 0.1-1.5 parts of 2,2'-azobis(2-methylpropionamidine) dihydrochloride, 0.1-0.5parts of azobisisobutyronitrile, 0.1-3 parts of a cationic emulsifier or a cationic reactive emulsifier, 4-7 parts of cationic starch dispersion, 0.05-0.5 parts of an acid-base buffer agent and 0.1-5parts of a chain transfer auxiliary. According to the technical scheme, water resistance, alkaline resistance and storage stability of the coating can be improved effectively, the coating further hasperformance and advantages of urea-formaldehyde resin and acrylate resin, and overall performance of a polymer is improved.

The invention discloses a low-cost high-performance ethylene-propylene-diene monomer (EPDM) cable sheathing material for mines. The low-cost high-performance EPDM cable sheathing material for the mines is prepared through the steps: plastifying 40-50 parts (by weight) of EPDM, 30-40 parts (by weight) of ethylene-butylene elastomer and 10-14wt% (based on EPDM) of chlorinated polyethylene together for 1-2 minutes; then, adding 30-35 parts (by weight) of white carbon black, 30-40 parts (by weight) of ultrafine talcum powder, 35-40 parts (by weight) of modified calcined clay, 10-12 parts (by weight) of nano-silica, 3-4 parts (by weight) of zinc oxide, 1-3 parts (by weight) of stearic acid, 21-23 parts (by weight) of paraffin oil, 4-6 parts (by weight) of paraffin, 1-1.2 parts (by weight) of accelerant MB and 0.8-1 part (by weight) of accelerant RD into the plastified material, carrying out uniform milling, and then, carrying out material discharging; and then, adding 2-2.5wt% (based on EPDM) of 2,5-dimethyl-di (tert-butylperoxy)-3-hexane and 1-1.5wt% (based on EPDM) of crosslinking-activity assistant HVA-2 into the discharged material for vulcanization, discharging the vulcanized material, and cooling the vulcanized material.

The invention provides radiation curable ink and application thereof. The radiation-curable ink comprises a polymerizable compound, a photoinitiator and a pigment, the polymerizable compound comprisesan epoxy compound, the epoxy compound comprises a first alicyclic epoxy compound, and the first alicyclic epoxy compound contains compounds represented by a formula (1) and a formula (2). In the radiation-curable ink, the polymerizable compound comprises the first alicyclic epoxy compounds shown in the formulas (1) and (2), and the first alicyclic epoxy compounds shown in the formulas (1) and (2)have better compatibility with other components in the composition system by adjusting the contents of epoxy and double bond groups. Therefore, the radiation-curable ink has low viscosity, good processability and productivity, the crosslinking density and surface tension of the whole composition are moderate, and the adhesive force is good during recoating, so that the radiation curable ink is more suitable for recoating.

The invention provides an insulation coating method of a metal soft magnetic composite material and the metal soft magnetic composite material. The insulation coating method of the metal soft magnetic composite material comprises the following steps: mixing tetraethoxysilane and trialkoxysilane, then adding the mixture into absolute ethyl alcohol, dropwise adding insufficient water for the first time, stirring for 2-30 minutes after dropwise adding, adding soft magnetic metal powder, stirring for 5-30 minutes, dropwise adding insufficient water for the second time, stirring for 2-20 minutes after dropwise adding, finally dropwise adding sufficient water, and continuously stirring for 5-60 minutes, filtering and drying to obtain the insulating coating powder. According to the preparation method, water is gradually added to promote gradual hydrolytic condensation of tetraethoxysilane and trialkoxysilane, the surface of the soft magnetic metal powder is coated with an insulating layer with the cross-linking density changing in a gradient mode, and after compression molding and annealing, the obtained metal soft magnetic composite material has the performance of insulation, low eddy current loss and the like.

The invention discloses a food-grade powder coating and a preparation method thereof. The food-grade powder coating provided by the invention comprises the following components in parts by mass: 160 to 240 parts of polyester resin; 80 to 140 parts of a filling material; 12 to 22 parts of a curing agent; 0.5 to 1.6 parts of a curing accelerator; 2 to 6 parts of an adhesion promoter; and 1 to 15 parts of other auxiliary agents. The polyester resin is formed by compounding polyester resin with a low acid value and polyester resin with a high acid value. The preparation method of the food-grade powder coating comprises the following steps: mixing the components, conducting stirring, conducting extruding by using a double-screw extruder, and conducting crushing and sieving to obtain the food-grade powder coating. A paint film formed by the powder coating has excellent high and low temperature resistance, baking resistance, acid and alkali resistance and weather resistance, is high in adhesive force, meets the national standard of food-grade coating products, and meets the standard of household appliance coating enterprises.

The invention discloses a curved surface compensation conveying belt, and relates to the technical field of conveying belts. The curved surface compensation conveying belt comprises a skeleton layer,an upper covering layer and a lower covering layer, wherein the upper covering layer is positioned on the outward side of the skeleton layer, and comprises a middle upper adhesive section and an edgeupper adhesive section in the width direction; the middle upper adhesive section is thicker than the edge upper adhesive section; the lower covering layer is positioned on the inward side of the skeleton layer, and comprises a middle lower adhesive section and an edge lower adhesive section in the width direction; and the middle lower adhesive section is thinner than the edge lower adhesive section. The service life of easily worn parts of the covering layers is prolonged through a curved surface compensation method, so that the service life of the conveying belt is prolonged.