30results about How to "Large volume shrinkage" patented technology

The invention discloses an anti-aging luminescent inorganic coating for building exterior walls and a preparation method thereof. According to parts by mass, the anti-aging luminescent inorganic coating for building exterior walls comprises the following raw materials: 20-30 parts of ceramic powder, 10-30 parts of modified epoxy resin 15 parts, 5-10 parts of hydroxyl silicone oil, 5-15 parts of luminescent powder, 10-15 parts of glass powder, 8.2-20.1 parts of mixing aid and 20-40 parts of water; the raw materials of modified epoxy resin include epoxy resin and A polyoxyethylene alkylphenol condensate, and according to the mass ratio, the mixing ratio of the epoxy resin and the polyoxyethylene alkylphenol condensate is (1.5-3):1. The anti-aging luminescent inorganic coating for building exterior walls proposed in this technical solution improves and optimizes the formulation of the luminescent coating, which helps to improve the anti-aging performance of the coating on the premise of ensuring the luminous effect of the coating. Furthermore, a preparation method of an anti-aging luminescent inorganic paint for building exterior walls is proposed, which has simple steps and strong operability, so as to overcome the shortcomings in the prior art.

The invention provides a polyurethane unsaturated polyester resin which is prepared by the following steps: (1) synthesis of hydroxyl-terminated unsaturated resin: reacting saturated dibasic acid or acid anhydride, unsaturated dibasic acid or acid anhydride and polybasic alcohol at 180-200 DEG C until the acid value is lower than 10, cooling, adding a polymerization inhibitor, and adding a reactive diluent for dilution at the temperature of lower than 100 DEG C to obtain the hydroxyl-terminated unsaturated resin; and (2) cooling the hydroxyl-terminated unsaturated resin to 60-80 DEG C, adding a polyisocyanate monomer, reacting at the temperature for 3 hours, detecting with an infrared spectrum until the 2273cm<-1> absorption peak completely disappears, cooling to lower than 50 DEG C, and discharging. Compared with the prior art, the flexibility and adhesive force of the unsaturated polyurethane photocuring resin are obviously better than those of UPR (unsaturated polyester resin), and the unsaturated polyurethane photocuring resin has similar comprehensive properties to PUV (polyurethane acrylate), but is much cheaper than PUV; and thus, the unsaturated polyurethane photocuring resin has excellent cost performance. The photocuring coating provided by the invention has the advantages of high adhesive force, favorable flexibility, low embrittlement tendency, low cost and obvious economic benefit.

The invention provides an injection-molded part, a forming method thereof, an edge covering structure and a vehicle window. The injection-molded part comprises a body part. The body part comprises a first part, a second part opposite to the first part, and a middle part located between the first part and the second part. The injection-molded part further comprises a plurality of gaps at least distributed in the middle part. The gaps are filled with buffer particles. The forming method of the injection-molded part comprises the steps that injection molding raw materials are provided; the buffer particles are mixed into the injection molding raw materials; the injection-molded raw materials are fused into an injection molding material; the injection molding material mixed with the buffer particles is injected into a mold; and in the cooling contraction process of the injection molding material, the part, not in contact with the side wall of the mold, of injection molding material is separated from the buffer particles, the gaps are formed, and thus the injection-molded part is formed. The injection-molded part, the forming method thereof, the edge covering structure and the vehicle window have the beneficial effects that the formed gaps can be used for reducing or counteracting deformation and collapse of the surface of the injection-molded part to a certain extent, and accordingly the production yield of the formed injection-molded part can be increased.

The invention discloses a preparation method of a hollow fiber internal pressure composite film, and aims to provide a preparation method of a hollow fiber internal pressure composite film with high supporting property and high pressure resistance. The preparation method comprises the following steps of: uniformly blending an outer layer film forming material, an outer layer film forming diluent and an outer layer film forming additive in a fusing process to obtain a thermally induced phase separation method outer layer film forming system; dissolving and uniformly mixing an inner layer film forming material, an inner layer film forming solvent and an inner layer film pore forming agent to obtain a non-solvent induced phase separation method inner layer film forming system, wherein the inner layer film pore forming agent contains over 70 percent of water-soluble polymer; and extruding and spinning in a composite way by introducing a core liquid into a central pipe, taking the inner layer film forming system as a middle layer and taking the outer layer film forming system as the outside, quickly soaking into a coagulation bath, fully curing an outer layer and an inner layer under the actions of the coagulation bath and the core liquid, and extracting and washing to obtain the hollow fiber internal pressure composite film. The large-inner-diameter hollow fiber internal pressure composite film prepared with the method disclosed by the invention can be used for replacing a tubular film during application.

The invention relates to a preparation method of a zinc oxide-based tubular rotary target material. The preparation method comprises the following steps: taking NH4HCO3 as a precipitant, preparing pure zinc oxide powder and Al-doped zinc oxide powder with an atomic ratio of 1-7at% by a chemical precipitation method, presintering, conglomerating and shaping the powder, filling the powder into a mould, moulding the powder in a cold isostatic pressing manner at 300-340MPa, obtaining a biscuit with a relative density of 70-75%, sintering the biscuit under an oxidizing atmosphere, and processing the sintered biscuit to obtain the rotary target material. Compared with the prior art, the preparation method provided by the invention has the beneficial effects that the density of the biscuit is improved by 10-15%; the volume shrinkage in later stage sintering is reduced; the sintering deformation of the tubular target with a large length-diameter ratio is effectively controlled; and in the process of sintering, the circulating oxygen is served as a control atmosphere to avoid the component changing, large pores on the surface and density reduction caused by the large pores on the surface.