Premixed polyether for ocean buoys, polyurethane raw material composition, polyurethane foam and preparation method of polyurethane foam

Abstract

The invention relates to premixed polyether for ocean buoys. In terms of parts by weight, the premixed polyether for ocean buoys is prepared from the following raw material components: 45-55 parts offirst polyether polyol, 25-35 parts of second polyether polyol, 15-25 parts of polyester polyol, 2-3 parts of a foam stabilizer, 1.5-3.0 parts of a catalyst, 1.5-1.7 parts of a chemical foaming agentand 19-21 parts of a physical foaming agent, wherein the first polyether polyol is polyether polyol which has a hydroxyl value of 465-515 mg KOH / g and a viscosity of 23,000-17,000 mPa.s at 25 DEG C, the second polyether polyol is polyether polyol which has a hydroxyl value of 415-435 mg KOH / g and a viscosity of 4800-6200 mPa.s at 25 DEG C, and the polyester polyol is polyester polyol which has a hydroxyl value of 170-180 mg KOH / g and a viscosity of 8000-13000 mPa.s at 25 DEG C. The invention also relates to a polyurethane raw material composition including the premixed polyether, polyurethanefoam and a preparation method of the polyurethane foam. The polyurethane foam has a long service life, low water absorption, high compressive strength, high corrosion resistance, high aging resistanceand other excellent properties, and can be applied to manufacture of ocean buoys.

Description

technical field [0001] The present application relates to the field of polyurethane technology. Specifically, the application relates to a composite polyether for marine buoys, a polyurethane raw material composition, polyurethane foam and a preparation method thereof. Background technique [0002] my country is located in Asia, which contains a large number of rich marine resources. The development of marine resources is of great significance to improve our country's comprehensive strength. With the continuous exploration of the ocean by human beings, the continuous progress of marine science and marine technology, marine scientific research, marine resource investigation, and marine biological scientific research work are becoming more and more frequent. Ocean buoys are gradually playing an increasingly important role in the application field of ocean engineering. . Ocean buoy is a modern ocean observation facility, which has the ability to collect marine environmental d...

AI Technical Summary

Problems solved by technology

However, the rigidity and strength of FRP are low, and the modulus of elasticity of FRP is 10 times smaller than that of steel, so the rigidity in the product structure is insufficient and it is easy to deform

In addition, when FRP is used in water, especially in salt water for a long time, due to the penetration of salt water and the swelling of FRP, the strength of FRP will obviously attenuate, and eventually lead to damage.

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