It does not contain PVC,so during spot welding the toxical gas containing chlorine is not released. This sealant has better oil surface adhesion,thixotropy,elasticity,bonding strength and resistance to medium.
In this paper, by researching use of PVC combined with Nitrile Butadiene Rubber(NBR), ratio of PVC/NBR and corresponding other reagent dose was determined. According to above study,thus, develop the rubber used for rubber membrane, which is weather resistance and reagent resistance.
The sealant has excellent resistance to water washing and stability. The sealant can be cured in hot water at 90 ℃ for 10 min and the cured has excellent sealability and resistance to media. It is used to seal the micropores in metal castings and powder metallurgy parts,the welding seams and other porous substractes.
Effect of curing temperature, curing time, resistance to media, kind and volume of the sand-laden fluid, and particle size of proppant on fibre compound sand control system were discussed.
A resinous bonding agent provides rigidity and resistance to media compression.
例句来源
The effects of the types and amount of pig-ments,antioxidant and UV absorbent on the titlecoating have been discussed.The coating formu-lated has the hardness more than 0.8,impactstrength 4.9N·m,flexibility 1 mm,adhesion100%,UV filterability 80~90%,IR filterabili-ty 35~65% and visible light filterability20~75%.
Air-drying-DCPD-type unsaturated polyester resin prepared by using modifiedhydrolysis addition method was proposed in the paper. By virtue of the theoretical analysis ofIR and NMR,the mechanism of synthesis reaction and the optimal technological conditionswere investigated.As a result, development was completed on the air drying unsaturatedpolyester resins,which have excellent properties such as shorter gelation time, higher curedvelocity, higher mechanical strength, greater hardness,and better thermal and ...
the effects of epoxy resin adhesive in sand filter on porosity, bending strength and the resistance to chemical solvents was studied. The content of the adhesive in sand filter, curing temperature and time were determinated.