34results about How to "No cracking problem" patented technology

The invention discloses a composite artificial stone table board and a preparation method thereof. The composite artificial stone table board comprises a surface layer and a base material layer, wherein the surface layer is prepared from raw materials, namely, quartz sand, quartz powder, a curing agent, an accelerant, a solvent, multifunctional epoxy resin, a coupling agent, a pigment and heat-conducting powder; the base material layer is prepared from raw materials, namely, aluminum hydroxide powder, quartz powder, a curing agent, an accelerant, a solvent, multifunctional epoxy resin, a coupling agent and a glass mat. The composite artificial stone table board has the advantages that the table board is high in strength, high in torsion and bending deformation resistance, high in heat conductivity coefficient, quick in heat dissipation, good in heat resistance and flame-retardant, does not age and yellow easily and the like, and the table board is suitable for popularization and application.

The invention provides a preparation method of a tin dioxide-based gas sensitive material. The method comprises the following steps: adding a weak acid into a salt solution of tin, regulating the pH value of the solution to be 1-2, and uniformly stirring at a first present temperature; adding a weak base at a preset rate until the pH value of the solution is regulated to 2-3, and continuously stirring to be in a gel state; taking out the gel, heating the gel to a second preset temperature, and adding a weak acid to regulate the pH value to be 1.5-2; adding polyethylene glycol, drying and sintering to obtain tin dioxide powder; adding metal salts and volatile alcohol solvents into the tin dioxide powder, grinding to obtain slurry, and sintering for preset time, thereby obtaining the metal doped tin dioxide-based gas sensitive material. The invention further provides a preparation method of a hydrogen sulfide gas sensor chip and a hydrogen sulfide gas sensor. By changing the preparationprocess of the gas sensitive material, the technical problem that a SnO2 base material does not have any response to H2S gas at a normal temperature is solved.

The embodiment of the present invention discloses a sidewall metallization method, which performs sidewall metallization treatment after packaging, and does not require slotting for sidewall metallization during substrate fabrication, which simplifies substrate fabrication. During the packaging process, due to The substrate has not been slotted for sidewall metallization, so that no special fixture is needed for vacuum adsorption technology, and the positioning is very simple, which simplifies the packaging process, thereby reducing the process complexity and production cost of sidewall metallization packaging products, and improving Improve work efficiency; when performing the above packaging process, because the substrate has not been slotted, the strength of the substrate is guaranteed, and the problem of cracking of the substrate will not be caused by improper force during packaging, thereby ensuring product quality. The accuracy is higher than the slotting accuracy during substrate fabrication, and the number of packaged substrate units that can be laid out on the strip increases. In addition, the processing method of the present invention can realize the processing of multi-electrode side wall metallization products.

The invention provides a preparation method of a stannic oxide-based gas sensitive element and a carbon monoxide gas sensor system. The preparation method comprises the following steps in sequence: uniformly stirring a saline solution of tin at a preset temperature; adding weak base according to a preset speed in the stirring process until the pH value of the solution is adjusted to be acid, continuously stirring until a gel state is achieved; drying gel, grinding and sintering to obtain stannic oxide powder; adding metal salt and volatilizable alcohol solvent into the stannic oxide powder, and carrying ball milling to obtain metal-doped stannic oxide-based gas sensitive slurry; and applying the metal-doped stannic oxide-based gas sensitive slurry to the electrode area of a sensor substrate, and sintering to obtain the stannic oxide gas sensitive element. According to the preparation method, the technical problem of high work temperature of a SnO2 gas sensitive element can be fundamentally solved by changing the preparation process of the stannic oxide-based gas sensitive element.

The invention discloses a manufacturing process of a novel fantasy color-changing fabric, which includes two steps of organic cotton dyeing and organic cotton printing. The organic cotton fabric with a unique coil structure is used as the gray fabric for the organic cotton dyeing. The organic cotton fabric has a plump and thick feel, The cloth body is firm and thick, with good elasticity, moisture absorption and warmth retention, stable terry structure, and easy printing. The fabric manufacturing process firstly dyes the organic cotton fabric to have a base color, and at the same time degreases the fabric. Make organic cotton fabrics have better water absorption; organic cotton printing uses 15 different color pastes, and the elastic transparent original paste is used as the bottom color paste, so that there will be no cracking problems after the subsequent multi-functional color pastes are superimposed; At the same time, an electric heating plate is installed on the printing machine between two adjacent screen plates, so that the color paste in the printing process can be dried quickly, so that 15 kinds of color paste can be perfectly compounded and superimposed.

The invention discloses a composite backboard of a photovoltaic module. The composite backboard is in direct contact with battery strings, and is integrated with the battery strings through a lamination process. The composite backboard adopts a single-layer structure, and the raw materials of the single-layer structure Including mixed A component, B component and C component, wherein, the raw materials of A component include polypropylene resin, first polyester resin curing agent and chopped glass fiber; the raw materials of B component include polyester resin, The second polyester resin curing agent and chopped glass fiber; the raw materials of the C component include EVA resin; the curing temperature of the polyester resin is greater than the melting point of the polypropylene resin; and the temperature of the lamination process is greater than the curing temperature of the polyester resin; The composite backsheet prepared by the invention has good water vapor barrier properties, insulation properties, flame retardancy, weather resistance and deformation resistance properties, while maintaining good plastic processing properties and adhesive properties, without the need for a separate adhesive The adhesive layer can be directly laminated with the battery string layer.