Sprayed polyurea coatings for solid buoyant material

Abstract

A polyurea coating for spraying it on the surface of solid float material is composed of semi-prepolymer A and multi-component amine mixture R through proportional mixing. Said component A consists of polyisocyanate and polyether polyol. Said component R comprises amine-type chain extending agent, amino-terminated polyether and assistant.

Description

technical field [0001] The invention relates to solid buoyancy materials used in marine technology development, such as water surface buoys, and solid buoyancy materials required for deep sea exploration, in particular to a sprayed polyurea cladding layer for solid buoyancy materials. Background technique [0002] The solid buoyancy material is actually a low-density, high-strength porous structure material, which includes a core material and a cladding layer. Core materials include chemical foams and some natural low-density high-strength materials. The present invention is a study on cladding layer. [0003] The cladding layers introduced by foreign materials mainly include the following types: 1. Rotationally Molded Polyethylene; 2. Molded Polyurethane Elastomer; 3. Spray-applied glass fiber reinforced resin (Spray-applied Polyethylene); GRP); 4. High-build coating; 5. Polyethylene Memory Foam. 6. Spray-applied Polyurethane Elastomer. The molding process and characteris...

AI Technical Summary

Problems solved by technology

[0004] Molding advantage shortcoming rotational molding polyethylene High wear resistance, water pressure resistance, impermeable, Bioinert, antifouling Large molding equipment is required, long production cycle molded polyurethane sexual body Tough, fatigue-resistant, impact-resistant, durable Grinding, hardness range from Shore A60 to Shore D70 varies Special mold, injection process Exquisite, long molding cycle, expensive use high Spraying glass fiber reinforced resin High impact resistance, good wear resistance Slow curing, long molding cycle polyethylene memory foam Energy absorbing, construction in spray polyurethane Ester elastomer inside, for use subject to surrounding In case of periodic shock The molding process is extremely complex High Build paint Low cost, simple process, suitable for Use within 50 meters underwater Many times of repainting, production cycle Long, pollutes the environment, has pinholes defect Spray polyurethane bomb sexual body Tough, fatigue-resistant, impact-resistant, wear-resistant, Hardness from Shore A60 to Shore D70, no need Mold, rapid prototyping, short production cycle Requires special spraying equipment and Professional and technical personnel, subject to the environment Effect of temperature and humidity

[0005] The early shallow sea solid buoyancy materials in China mostly used cork, buoyancy cylinders and synthetic rubber, but their compressive strength was very low

In the 1980s, Harbin Shipbuilding Engineering Institute used epoxy resin to bond hollow glass balls with a diameter of 3 to 5 mm to make a pressure-resistant 5.5MPa and a density of 550Kg / m 3 However, the following problems were found in use: ①The glass balls are easy to break and the production process is complicated; ②The foam core material after molding is difficult to process; ③The source of glass balls is difficult and expensive, and the large-scale Scale production and application

[0007] my country's patent application (Application No. 01114995.7, 01114996.5) has reported the use of 100% solid content sprayed polyurea elastomer as a waterproof wear-resistant and prop protection material. It has not been seen that sprayed polyurea elastomer has been used as a coating layer in solid buoyancy at home and abroad. Patent coverage on materials