30results about How to "Enhanced stone chip resistance" patented technology

A pneumatic tire is provided which can realize an increase in stone-catching resistance while suppressing uneven wear such as river wear in a tread portion. In a pneumatic tire in which a center rib and intermediate ribs which are defined by four straight-line main grooves, which extend continuously in a circumferential direction of the tire and shoulder ribs which are defined by the main grooves which are situated closer to shoulders of the tire and straight-line thin grooves which extend continuously in the circumferential direction of the tire in the vicinity of tread ground-contacting edges are formed on the surface of a tread of the tire, inclination angles of a shoulder side groove wall of the main groove which defines the shoulder rib and a tire's equator line side groove wall of the thin groove are both such an angle that the shoulder side groove wall and the tire's equator line side groove wall are inclined at an angle of not more than five degrees in a direction in which the width of a proximal portion of the rib is expanded relative to normal lines to the tread.

The invention relates to a synthetic method of compound blocked polyisocyanates by using multiple sealants to compound and block terminal groups, which is characterized in that 300-600 parts of polyisocyanate ( by mass part, the same below), 50-350 parts of active methylene compound and 290-335 parts of solvent are stirred for 1-3 hours at a temperature of 50-90 DEG C; 50-350 parts of another active methylene compound is added to be stirred for 1-2 hours at a temperature of 50-90 DEG C; 20-130 parts of pyrazole derivative compound is added to be stirred at a temperature of 50-85 DEG C in batches until NCO groups can not be detected or NCO% is not higher than 0.2% (about 0.5-2 hours). Compared with the prior art, the invention has improved technology and obvious advantages.

The invention discloses self-phosphating waterborne polyurethane acrylate paint applied to a car axle coating production line and a preparation method thereof. The preparation method comprises the following steps: carrying out chain extension reaction on polyether glycol, diisocyanate, dimethylolpropionic acid and 1,4-butylene glycol to obtain an isocyanate-terminated waterborne polyurethane prepolymer; adding hydroxyethyl acrylate to carry out end-capping reaction, adding triethylamine to perform neutralizing and salifying after cooling, adding water for emulsifying, evaporating out a solvent to prepare a semi-transparent waterborne polyurethane macromonomer; adding acrylate monomer mixed liquor which is mixed with initiator potassium persulfate and contains acrylic phosphate for carrying out polymerization reaction to prepare the self-phosphating waterborne polyurethane acrylate emulsion. A paint dropped in a coating process of the self-phosphating waterborne polyurethane acrylate paint can be recycled, and can be self-phosphated to avoid a surface phosphating treatment process; moreover, the flexibility, compactness and flash erosion resistance of the cured coating can satisfy the coating performance of a car axle steel plate.

The invention provides a water-based stone-crash-resistant blocked polyisocyanate curing agent as well as a preparation method thereof and a water-based coating. The water-based stone-crash-resistantblocked polyisocyanate curing agent comprises the following raw materials: a polyisocyanate compound, a hydrophilic chain alcohol, a reactive methylene-based sealing agent, a cosolvent, an alkali metal salt of an alcohol and a neutralizing agent, wherein a molar amount of NCO in the polyisocyanate compound is greater than a molar amount of total active hydrogen. The invention also provides the preparation method of the water-based stone-crash-resistant blocked polyisocyanate curing agent and the water-based coating. According to the curing agent provided by the invention, a cross-linking density of a coating film can be improved, and therefore the stone crash resistance of the coating in automobiles under the low-film-thickness conditions can be improved.

The invention relates to the technical field of coating, in particular to a dual-component waterborne polyurethane intermediate coating composition with anti-sagging characteristics and a preparationmethod thereof. The composition is mainly prepared from an A component and a B component. The A component is prepared from, by mass, 28-45% of hydroxyl functionalized waterborne acrylic resin, 2-9% ofa cosolvent A, 0.2-1.2% of a dispersant, 0.2-0.35% of a leveling agent, 0.1-0.3% of a defoamer, 0.1-0.45% of a pH regulator, 6-17% of pigment, 14-40% of a filler, 4.5-12.5% of a waterborne anti-sagging polymer containing a polyurea group and 6.55-12% of deionized water. The composition has excellent sagging resistance, adhesive force, waterproofness and resistance to stone crash.

The invention provides a graphene oxide waterborne polyurethane stone-chip-resistant anti-corrosion coating and a preparation method thereof. The coating comprises an aliphatic or alicyclic isocyanatemonomer, a polyhydric alcohol, a catalyst, a hydrophilic chain extender, a crosslinking agent, a silane coupling agent, a graphene oxide aqueous solution and a first neutralizing reagent. The preparation process of the anti-corrosion coating is simple and easy to operate, has a low equipment requirement and a short curing time, can effectively reduce the protection cost, and is suitable for industrial production.

The invention discloses an oil metallic paint used for commercial vehicle surface coating. The oil metallic paint comprises, by weight, 28 to 40 parts of acrylic resin, 20 to 30 parts of polyester resin, 30 to 60 parts of a paint naphtha,20 to 28 parts of tung oil, 15 to 22 parts of isopropanol, 6 to 12 parts of water, 3 to 6 parts of zinc molybdate, 5 to 10 parts of an aluminium powder pigment, 50 to 80 parts of a grinding auxiliary agent, and 4 to 8 parts of a processing auxiliary agent. The oil metallic paint used on commercial vehicle surfaces is simple in preparation method, is low in preparation cost, is safe, is friendly to the environment, possesses excellent corrosion resistance, rusting resistance, weatherability, wear resistance, and shock resistance, is used for commercial vehicle surface coating, is convenient to use, is rapid in curing; no toxic substance is generation in preparation and using process; obtained coating film is flat and compact, is capable of improving vehicle surface coating film appearance effect and stone crash protection performance; and the oil metallic paint is worthy of popularization.

The invention aims to provide a sandwich structure bottom plate of a power battery lower box body and the power battery lower box body. The sandwich structure bottom plate comprises a water cooling system (3.4), a steel stamping lower bottom plate (3.6) and a carbon fiber plate (3.1) which are arranged in a layered manner from top to bottom, the water cooling system (3.4) comprises at least one water cooling plate, hanging lug through holes (3.4.9) are distributed in the water cooling plate, pressing rivet nuts (3.3) are distributed on the stamping lower bottom plate (3.6), water cooling platefixing bolts (3.5) penetrate through the hanging lug through holes (3.4.9) to be connected with the pressing rivet nuts (3.3) so as to fix the water cooling plate to the stamping lower bottom plate (3.6); the carbon fiber plate (3.1) is fixed on the stamping lower bottom plate (3.6) in a manner of adhesive connection; and bottom plate fastening bolts (3.2) used for external connection are distributed on the stamping lower bottom plate (3.6). Corrosion resistance and stone impact resistance of the bottom of the box body can be improved, the maintenance is convenient, the mechanical performanceis good while light weight is achieved, and the structural rigidity is high.

The invention provides cathode electrophoretic paint for a plate spring and a preparation method of the cathode electrophoretic paint. The cathode electrophoretic paint comprises epoxy resin; when the epoxy value of the epoxy resin is smaller than 0.4, the cathode electrophoretic paint further comprises epoxy diluent; on the contrary, the cathode electrophoretic paint further comprises a chain extender; and the epoxy diluent and the chain extender are flexible chain compounds. According to the epoxy value of the epoxy resin, the epoxy diluent or the chain extender of the flexible chain compound is added in the raw materials, the brittleness of the cathode electrophoretic paint is reduced, then stone crash resistance is improved, and meanwhile, salt fog resistance is improved.

The invention discloses a water-based metallic paint used for commercial vehicle surface coating. The water-based metallic paint comprises, by weight, 25 to 35 parts of aqueous polyester resin, 20 to32 parts of aqueous acrylic resin, 4 to 8 parts of zinc dihydrogen phosphate, 2 to 3 parts of nanometer titanium dioxide, 3 to 8 parts of an oxidizing agent, 5 to 12 parts of a sodium hydroxide solution, 4 to 8 parts of methanol, 3 to 8 part of an aluminium powder pigment, 2 to 5 parts of an environmental protection inorganic pigment, 2 to 4 parts of a processing auxiliary agent, and 50 to 80 parts of water. The raw materials of the water-based metallic paint are safe, are friendly to the environment, and are cheap; the aluminium powder pigment is subjected to pretreatment and oxidation modification, so that the stability and the dispersion performance of the aluminium powder pigment in water are improved. The water-based metallic paint is simple in preparation method, is low in preparation cost, possesses excellent corrosion resistance, wear resistance, weatherability, rusting resistance, antibacterial performance, shock resistance, and ultraviolet resistance, is used for commercial vehicle surface coating, is convenient to use, is rapid in curing; beautifying effect is excellent;and the water-based metallic paint is worthy of popularization.

The invention discloses an automobile chassis protective agent and a preparation method thereof. The automobile chassis protective agent comprises the following raw materials in parts by weight: 90-100 parts of paraffin, 20-30 parts of microcrystalline wax, 3-6 parts of polyethylene wax, 2-4 parts of modified montmorillonite, 6-8 parts of polyurethane acrylate resin, 2-3 parts of a sulfonate type antirust agent, 1-2 parts of a calcium salt type antirust agent, 2-3 parts of a nonionic antirust agent and 3-4 parts of a phenolic antioxidant. The modified montmorillonite is obtained by modifying Na-montmorillonite by adopting CTAB. The automobile chassis protective agent is good in stability, has good adhesive force with the automobile chassis, and has excellent high and low temperature adaptability, anti-rust performance and wear resistance.

The invention discloses waterborne polyurethane-polyacrylate resin, which is mainly obtained by reaction of a waterborne polyurethane prepolymer, an acrylic monomer and an initiator, wherein the waterborne polyurethane prepolymer is obtained by reacting a polyol prepolymer, an isocyanate monomer, a solvent, a hydrophilic monomer, a functional monomer, a catalyst, a chain extender, an acrylic monomer and an organic base. The waterborne polyurethane polyacrylate resin has extremely low VOC content and is green and environment-friendly, and meanwhile, waterborne metal flashing paint prepared fromthe waterborne polyurethane polyacrylate resin has excellent stone chip resistance after film formation.