31results about How to "Moderate curing time" patented technology

The invention provides an adhesive for grade-E0 medium density fiberboards. The raw materials of the adhesive include formaldehyde, polyvinyl alcohol, urea and tripolycyanamide. The production process of the adhesive comprises: firstly, adding all formaldehyde into a reaction kettle, regulating the pH value of formaldehyde solution to 7.5 to 8.5 by using sodium hydroxide solution, adding the 40 to 50 percent of polyvinyl alcohol and urea and adding 80 to 90 percent of tripolycyanamide and adding the 10 to 20 percent of urea; secondly, adjusting the pH value to 5 to 6 by using formic acid, reacting for 20 to 30 minutes till a cloud point, regulating the pH value to 705 to 8.5 with caustic soda solution, and adding the 10 to 20 percent of tripolycyanamide and 20 to 30 percent of urea; and finally, adding 10 to 20 percent of urea, regulating the pH value of the adhesive to 6.6 to 7.5, and discharging. The adhesive has the advantages that: the free formaldehyde content is very low, and the manufactured medium density board is of grade E0; the curing time is proper, the storage stability is high, and the normal-temperature storage period is about 1 month; and the manufactured medium density board has high internal combining strength and high waterproof and dampproof performance.

The invention provides a preparation method of a continuous carbon fiber reinforced aluminum-based composite material. According to the preparation method provided by the invention, the thickness of an aluminum layer adhered to the surface of the carbon fiber can be controlled by adopting a method of adhering curing aluminum powder to the surface of continuous carbon fiber through organogel, so that the content and the spacing of the carbon fiber in a composite material after hot pressing sintering can be controlled, the carbon fiber can be parallelly distributed in an aluminum matrix, and analuminum-based composite material with high carbon fiber content can be prepared. The preparation method disclosed by the invention is low in cost and easy to operate and is capable of realizing industrialized production; the strength of the carbon fiber reinforced aluminum-based composite material obtained through the preparation method provided by the invention is obviously superior to that of the carbon fiber reinforced aluminum-based composite material prepared through an existing infiltration method, and a wide application prospect is obtained.

The invention discloses a low-cost, long-reserved time and high-performance modified asphalt and a preparation method thereof. The modified asphalt is an A and B dual-component system, wherein the component A is an epoxy resin and polyethyleneglycol diglycidylether mixture; and the component B comprises an emulsifier, matrix asphalt, a solidification agent and activated waste rubber powder. The preparation method comprises the following steps: adding the activated waste rubber powder into the matrix asphalt, adding the emulsifier and the solidification agent under a high temperature condition, carrying out shearing emulsification to obtain the component B, and fully mixing the component A and the component B of the modified asphalt to obtain the low-cost, long-reserved time and high-performance modified asphalt. Long reserved time is realized through selecting the specific epoxy resin solidification agent and regulating the solidifying rate of an epoxy system in order to meet road pavement and engineering maintenance with long reserved time requirements. The matrix asphalt and the waste rubber powder are used, so the production cost is reduced, and the low-temperature cracking resistance and stability of the modified asphalt are improved.

The invention discloses a marble glue adhesive for construction engineering and a preparation process thereof. The marble glue adhesive comprises a component A and a component B, wherein the weight ratio of the component A to the component B is 10:3; the component A consists of the following raw materials in parts by weight: unsaturated polyester resin, a reinforcing filler, a polymerization inhibitor, an accelerant, reinforcing chopped fiber, polyethylene glycol methacrylate, a diluent and a thixotropic agent; and the component B consists of the following raw materials in parts by weight: a filler curing agent, a plasticizer, an emulsifier and a thixotropic agent. The preparation method disclosed by the invention comprises the following steps: preparing the unsaturated resin, polyethyleneglycol methacrylate, the component A, the component B and the marble glue adhesive. The marble glue adhesive disclosed by the invention has excellent tensile shearing strength and impact strength, and has the advantages of convenient source of raw materials, simple production process, moderate curing time for obtained products, stable storage, small odor, high hardness, good toughness, excellentadhesive strength, good elasticity, excellent resistance to yellowing, moisture and heat, and the like.

The invention discloses an epoxy resin mortar comprising the following materials by weight: 90 parts of epoxy resin, 23-25 parts of curing agents, 26-28 parts of diluents, 170-190 parts of acid-resisting powder materials and 310-330 parts of aggregates. The epoxy resin mortar has appropriate curing time under high-temperature and dry climates and also has good compression strength and insulating property.

The invention discloses vacuum infusion resin and a preparation method and application thereof. The vacuum infusion resin comprises toughening epoxy resin accounting for 50-70% of the total mass of the vacuum infusion resin and a curing agent accounting for 30-50% of the total mass of the vacuum infusion resin. The vacuum infusion resin has the advantages that the toughening epoxy resin enhances the toughness of the vacuum infusion resin and lowers the viscosity of the vacuum infusion resin, and later process operations are facilitated; tetramethyl guanidine is used as the curing agent of the toughening epoxy resin and is moderate in curing time and curing temperature, and the cured vacuum infusion resin is low in viscosity and excellent in performance; the vacuum infusion resin is low in viscosity, high in toughness, simple in preparation method and widely applicable to pouring field of medium- and high-voltage electric insulating parts and has a long working life under 40 DEG C.

The invention provides a composition of a two-component marking coating and a preparation method thereof. The composition of the two-component marking coating comprises a component A and a component B, and the mass ratio of the component A to the component B is 3-3.5: 1. The component A is prepared from the following raw materials, by weight: 17 to 20 parts of acrylic resin, 15 to 18 parts of polycaprolactone polyol,1 to 1.8 parts of nano-zinc oxide loaded graphene oxide, 10 to 15 parts of modified hollow glass beads, 5 to 8 parts of titanium dioxide, 0.3 to 0.6 part of a silane coupling agent, 30 to 35 parts of fillers, 0 to 1.5 parts of pigment, 0.5 to 0.8 part of a dispersing agent, 0.2 to 0.3 part of a leveling agent and 0.1 to 0.3 part of a defoamer. The component B is a hexamethylenediisocyanate tripolymer. A coating film corresponding to the two-component marking coating is high in strength, toughness and hardness, has relatively high wear resistance and weather resistance, ishigh in bonding strength with a pavement, and is long in service life.

The invention discloses a dedicated press-clip type wiring box for a cadmium telluride thin film assembly. The wiring box includes a box body, a bottom board and a pedestal buckled to each other so asto form a mounting cavity. A diode is mounted in the mounting cavity. The box body is provided with a sunken mounting groove used for accommodating the diode. The mounting groove is provided with a boss protruding from the box body and formed on the back face of the box body. A plurality of radiating fins are arranged on the periphery of the boss. The box body is provided with a wire slot reaching the mounting groove from the edge of the box body. A cable is connected with the diode via the wire slot. The bottom board is in a shape corresponding to that of the mounting groove and can be nested in the mounting groove so as to form a plane with the bottom part of the box body. The middle part of the bottom board is provided with a sub box body which has a hollow bottom part. The box body with provided with a neck within the mounting groove. When the box body buckles with the bottom board, the neck is disposed in the bottom hollow part of the sub box. The edge of the bottom board is connected with a wire slot cover board capable of being spliced with the wire slot. The pedestal is provided with a pin, so that the pin is in associated connection with the neck when the pedestal is nested in the hollow part of the sub box.

The invention relates to a magnetorheological porous soft mold and a plate forming device. The magnetorheological porous soft mold comprises an elastic base body with pores; and magnetic particles integrally formed in the elastic base body, wherein the magnetic particles are distributed in the elastic base body in a dispersed mode and located outside the pores. The elastic base body comprises at least two forming sections; all the forming sections are internally provided with the pores, and the porosity of at least one forming section is larger than that of the other forming sections, so that the elastic modulus of the forming sections with the large porosity is smaller than that of the forming sections with the small porosity; or at least one forming section is internally provided with the pores and at least one forming section is not internally provided with the pores, so that the elastic modulus of the forming sections with the pores is smaller than that of the forming sections without the pores. Through the design of the structure, when a blank is in complete contact with a special-shaped female mold, the stress of the whole blank is uniform, and the situation that the blank is broken due to the fact that the forming force is too large when a deeper part is formed is avoided.

The invention discloses a glass ionomer cement compound used for the dental department the matrix component of the glass ionomer cement compound comprises silicon-aluminum-fluorine glass powder and polycarboxylic acid liquor, wherein the polymerizable monomer of the polycarboxylic acid comprises 55-70 parts by weight of acrylic acids, 25-30 parts by weight of itaconic acids and 5-15 parts by weight of alkyl olefine acids. The invention prepares a tricarboxylic acid copolymer, the tricarboxylic acid copolymer is dissolved in water to prepare the polycarboxylic acid liquor used for the glass ionomer cement, the polycarboxylic acid liquor and the commercially available silicon-aluminum-fluorine glass powder are mixed and cured, and therefore, the prepared glass ionomer cement has the characteristic of high mechanical strength. Compared with the prior art, the glass ionomer cement compound can effectively improve the bending strength and the compressive strength of the glass ionomer cement, and the application range of the glass ionomer cement in the field of dental department restoration is expanded.