3results about How to "No swelling" patented technology

The invention provides a curing agent, a composition, a cover plate and a manufacturing method and application thereof, the curing agent comprises phenolic resin and arylamine formaldehyde resin, and the arylamine formaldehyde resin comprises a compound with a structural formula 1; in the structural formula 1, R1, R2, R3 and R4 are independently selected from one of hydrogen, amino, alkyl and alkylene, and n is the degree of polymerization and meets the requirement of weight-average molecular weight of 300-5000; the curing agent provided by the invention can improve the degree of cross-linking reaction with high polymer materials such as epoxy resin when being used for preparing the bolt capacitor cover plate, and improves the solvent resistance.

The invention relates to a phosphogypsum modified material for a highway under a new excitation system and a preparation method and device thereof, and belongs to the technical field of highway engineering in traffic transportation engineering. The modified material comprises the following raw materials in percentage by weight: 80-90% of phosphogypsum and 10-20% of a modifier, totaling 100%, the mass of the water is 15%-18% of the total mass of the phosphogypsum and the exciting agent; the modifier comprises the following raw materials: calcium oxide, silicon dioxide, ferric oxide, aluminum oxide, mineral powder, tricalcium silicate, calcium carbonate, sodium silicate, a coupling agent, iron powder and rubber powder. The ardealite modified material has the advantages of excellent strength increase and stability improvement in the aspect of long-term performance development, is high in environmental protection property, free of pollution to the environment, soil and water, good in economical efficiency and easy to popularize and apply, and does not increase the comprehensive construction cost of a project.

The embodiment of the invention provides a sealing structure suitable for a rotor pump. The sealing structure comprises a pump body 1, a gear 2, a sliding bearing 3, a front cover 4, a rear cover 5, a rear O-shaped ring 6 and a front O-shaped ring 7. The gear 2 and the sliding bearing 3 form a dimension chain which is arranged in an 8-shaped hole of the pump body 1; the rear O-shaped ring 6 and the front O-shaped ring 7 are sealing rubber rings; the front O-shaped ring 7 is embedded between the pump body 1 and the front cover 4, the rear O-shaped ring 6 is embedded between the pump body 1 and the rear cover 5, and the gap of a pump set is controlled through the sealing effect of rubber and the machining size. By providing a pure mechanical seal ring control clearance gear pump structure, after a pump set operates for a period of time, a medium in the pump is directly sealed through an O-shaped ring at the end face, the phenomenon of swelling cannot be generated, the end face clearance cannot be increased, the effects of reducing internal leakage of the pump set and ensuring normal operation of the pump set are achieved, and meanwhile the gear pump has the advantages of being simple in structure, convenient to operate and the like. And the use is durable.