A kind of surface treatment method of buoyant material

Abstract

The invention relates to a surface treatment method of a buoyancy material. The surface treatment method comprises the following steps: firstly, fixing a buoyancy material to be treated in a container, placing right below a sprue gate in a vacuum casting tank, and vacuuming; putting an epoxy resin, an active diluent, a coupling agent and a surfactant into a mixing tank, uniformly stirring at the room temperature, and carrying out vacuum defoaming; uniformly stirring with a curing agent and a curing accelerant at the room temperature; opening the valve of a discharge hole of the mixing tank, and enabling a resin mixed liquid to flow into the container of the buoyancy material till the liquid level is 2-3cm higher than the upper surface of the buoyancy material; opening the air inlet of thevacuum casting tank, increasing the pressure in the tank to 2000Pa, keeping the pressure for 5 minutes, and releasing the pressure; washing with absolute ethyl alcohol till the surface of the tank hasno residual resin, and keeping the temperature at 80 DEG C for 12 hours. By adopting the process, the water absorption rate of the material can be reduced to 0.1% or lower, and in addition the density of the material is not affected; even if the surface is damaged to a certain extent, the water absorption rate is still kept at about 0.5%, and the reliability of a floating body is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of composite materials, in particular to a surface treatment method for buoyant materials. Background technique [0002] With the continuous increase of my country's marine resources development, marine engineering and other activities, the use of various buoyancy compensation materials is also increasing year by year, and they are widely used in underwater robots, deep submersibles, offshore oil platforms, underwater construction and other fields. Among the many performance indicators of buoyant materials, the water absorption rate is related to the stability of the net buoyancy of the buoyant material, the reliability of the buoyant body, and the service life. It is an important indicator of the product. At present, Syntactic Foam buoyancy material has a series of advantages such as high compressive strength, good processability, and high elastic modulus, and has become the most widely used type of buoyanc...

AI Technical Summary

Problems solved by technology

Since underwater equipment needs to go up and down frequently, storage under non-working conditions also belongs to the marine atmospheric corrosion environment, and is easily exposed to direct sunlight. In this complex environment, the aging speed of the waterproof layer is very fast; The equipment is often subject to external impact during storage, hoisting and work, which may also cause damage to the waterproof layer

Once the waterproof layer fails, the buoyancy material will reduce the net buoyancy due to water absorption, which will bring safety hazards to the use of underwater equipment

In addition, since the bulk density of this waterproof layer is significantly higher than that of the buoyant body, the overall density of the buoyant material after the coating is applied will also be affected

Since the epoxy / polyurea waterproof layer is mostly constructed by spraying, there are still problems such as construction difficulties and uneven thickness of the waterproof layer for some buoyancy with complex shapes.

[0004] In the mid-1990s, the solid buoyancy material prepared by the chemical foaming method of the Ocean Chemical Research Institute used epoxy resin glass fiber reinforced plastic waterproof layer, which has the disadvantages of high brittleness, poor toughness, easy cracking, and easy aging.

Chinese Patent Publication No. CN1401717 "spray polyurea coating for solid buoyancy material" has also reported a method of spraying polyurea coating on the surface of the floating body to improve the waterproofing of the floating body, but the coating layer is to the infiltration of the surface of the buoyancy material matrix Poor ability, easy to peel; poor UV resistance, easy to age; the construction method is generally spraying, so it is not suitable for some floating bodies with complex shapes

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