Organic fluorine oxosilane nanometer freezing sticky resistant coating and preparation process thereof

Abstract

The invention discloses an organic fluorine oxosilane nanometer freezing sticky resistant coating and a preparation process of the organic fluorine oxosilane nanometer freezing sticky resistant coating. A coating layer comprises a fluorine oxosilane solution and / or hydroxyl-terminated fluorine contained silicone oil, a catalytic agent, polyvinyl acetal, a diluent, a curing agent, a plasticizer, a dispersing agent, an antifoaming agent and nanometer powder. A synthetic process: adding 15-20% of the fluorine oxosilane solution and / or the hydroxyl-terminated fluorine contained silicone oil and 30-36% of the polyvinyl acetal into the 16-30% diluent, adding 0.5-1% of the catalytic agent, adding 2-5% of the plasticizer and 1-2% of the nanometer grade inorganic powder, 0.5-10% of the dispersing agent and 0.5-2% of the antifoaming agent, reacting for 2-4 hours at the temperature of 90 DEG C for ball milling, finally adding 10-20% of the curing agent, and evenly stirring and coating on a surface of a workpiece for room temperature curing. The coating layer can obviously reduce bonding strength between frost and a metal substrate, and can effectively reduce or restrain formation of the frost.

Description

Technical field: [0001] The invention relates to a solution of fluorine-containing siloxane and / or a polycondensate of hydroxyl-terminated fluorine-containing polysiloxane and polyvinyl acetal, which is an anti-icing coating for metal surfaces and belongs to the field of polymer materials . Background technique: [0002] Freeze sticking is a natural phenomenon in the northern region. It is an adhesion phenomenon in a special environment under the combined action of low temperature and moisture. It is the adhesion effect on the surface of objects during the freezing process of water. The problem of freeze stickiness is closely related to people's daily life and industrial and agricultural production. At the same time, the existence of freeze sticky layer also brings many inconveniences to human production and life, such as: resource consumption, accelerated component loss, reduced production and work efficiency and reliability. In severe cases, major accidents may be caused....

AI Technical Summary

Problems solved by technology

The problem of freeze stickiness is closely related to people's daily life and industrial and agricultural production. At the same time, the existence of freeze sticky layer also brings many inconveniences to human production and life, such as: resource consumption, accelerated component loss, reduced production and work efficiency and reliability. In severe cases, major accidents may be caused. According to the actual working conditions and work nature requirements of various components, the existing anti-freeze sticking prevention technologies mainly include: (1) Manual or mechanical cleaning method: use various tools or machinery to clean the freeze-stick Knocking on the surface of the layer has a long history, high feasibility, less equipment investment, and convenient operation. The disadvantages are strong passivity, low efficiency, high work intensity and limited by the structural shape or terrain of the parts, and the working parts are easily damaged. Can be used as an emergency method, neither safe nor very effective

There is still the problem of incomplete cleaning, which can only solve the short-term freezing and sticking

(2) Chemical reagent method: use chemical reagents to lower the freezing point of water, delay the formation process of the frozen sticky layer, and reduce the frozen sticky strength, which has quick results and good results. The disadvantage is that it has a corrosive effect and serious pollution to the surrounding environment. consumes more resources

(1) Accelerate the loss of electric energy to a certain extent; (2) During the curing process of the coating, harsh curing conditions such as temperature and pressure are required, which are inconsistent with the actual construction conditions; (3) The stability of the coating itself is compared Poor, if it is left for a long time, cross-linking may occur, making the coating lose the anti-freezing and sticking effect

(4) After the coating is cured, the adhesion to the substrate is poor, and the coating life is short; (5) The construction conditions are relatively harsh

[0010] Since the various antifreeze sticky coatings currently available cannot meet the needs of actual production and life, it is urgent to develop an antifreeze sticky coating that can be cured at room temperature, is convenient for construction, and has a long service life of the coating; The Si-OH produced after the hydrolysis of the alkane condenses with the hydroxyl produced by the metal substrate. The layer needs to be cured at high temperature (100°C-150°C), which greatly limits its practical application

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