News Details
Precoating film with water-based paint crosslinking agent
2017-7-1 15:53:21
Precoating film with water-based paint crosslinking agent
Using aqueous polyurethane resin as main film former, and water closed isocyanate crosslinking agent, the surface wetting additives, adhesion agent and defoaming agent to cooperate, the preparation of the corona processing optical two-way stretch polyester film (BOPET) pre-coating film use water-based coating liquid online.
The influence of the main forming material, crosslinking agent, various auxiliaries and the solid content of coating liquid on the coating liquid and its precoating properties were studied. The research shows that the water-based coating can satisfy the process requirement of on-line coating.
Adopts pre-coating film of the preparation of the coated fluid has excellent optical properties and apparent state, with the corona treatment optical BOPET under high temperature and high humidity environment and various functional surface coating has good adhesion performance.
When the slurry is prepared, a lot of bubbles will be produced and the appropriate amount of defoaming agent should be added. Organic siloxane, polyacrylic acid, etc. These molecules are incompatible with water and can be spread over the inner surface of the bubble, pushing up the bubbles. The repulsion of the surfactant and water makes the bubble burst. The amount of anti-foaming agent should not be too much, about 0.1 ~ 1 wt %, otherwise it will produce wet and shrinkage problems.
Aqueous slurry in the process of coating and drying to produce the problem such as shrinkage cavity, sag is more, the main reason is that the water's surface tension is bigger (about 72 dyne/m), and the aluminum foil tension between 30 ~ 40 dyne/m. To maintain the size and the aluminum foil substrate wetting, need to join the substrate wetting agent, flow ping agent such as fertilizer, to reduce the surface tension of paste, and in the process of moisture volatilizes to moisturize, steady flow and peaceful.
Such auxiliaries are dominated by polyether siloxane, but silicone auxiliaries migrate to the coating surface and affect the adhesion of the layers. There are also many silicon - free additives such as polyether ethyl nonylphenol, fluorocarbon polymer and acrylic fluid, etc.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
There is a large amount of adhesive in the conductive coating, resulting in a larger surface resistance. In order to guarantee the adhesion of the coating, it is often added 40 wt % of the agent to produce the larger surface resistance. Many methods have been used to prepare carbon/aluminum composite materials, and realize the chemical action of aluminum foil and carbon directly. Such as carbon black coating under N2 atmosphere in 400 ~ 600 ° C carbide processing, surface generation Al4C3.
Lv mingzhe et al. used carbon coated aluminum foil to heat treatment under the atmosphere of hydrocarbons. Aluminum - carbon compounds were formed between aluminum foil and carbon coating as the connection phase to improve adhesion and reduce internal resistance. But these methods are difficult to process, high production cost.
Insufficient stock stability. The water-based coating of carbon material is very strict with the particle size of carbon materials, usually at the nanometer level, which is easy to reunite when the particle is placed in static position. In order to increase the stability, the dispersants are often added, but the amount of dispersants is too much to affect the resistance and adhesion properties of the slurry.
At the same time, the addition of water-based resin, thickening agent and other additives can also make dispersants free of carbon and accelerate the reunion process. Some studies have directly grafted hydrophilic groups on carbon black to improve their hydrophilicity to improve dispersion stability. The development of carbon materials with wetting and conductive properties is a promising direction for the preparation of conductive coatings for water-based carbon.
The technical problem of water based sizing is more. In the slurry stage, the bubbles, the shrinkage cavity, the flow and the wetting etc. The defects in the process of breaking water paint are the problems of the whole coating field. The characteristics of high conductivity, low impurity content and thin coating thickness have brought new challenges to the research and development of water-based carbon coatings.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Using aqueous polyurethane resin as main film former, and water closed isocyanate crosslinking agent, the surface wetting additives, adhesion agent and defoaming agent to cooperate, the preparation of the corona processing optical two-way stretch polyester film (BOPET) pre-coating film use water-based coating liquid online.
The influence of the main forming material, crosslinking agent, various auxiliaries and the solid content of coating liquid on the coating liquid and its precoating properties were studied. The research shows that the water-based coating can satisfy the process requirement of on-line coating.
Adopts pre-coating film of the preparation of the coated fluid has excellent optical properties and apparent state, with the corona treatment optical BOPET under high temperature and high humidity environment and various functional surface coating has good adhesion performance.
When the slurry is prepared, a lot of bubbles will be produced and the appropriate amount of defoaming agent should be added. Organic siloxane, polyacrylic acid, etc. These molecules are incompatible with water and can be spread over the inner surface of the bubble, pushing up the bubbles. The repulsion of the surfactant and water makes the bubble burst. The amount of anti-foaming agent should not be too much, about 0.1 ~ 1 wt %, otherwise it will produce wet and shrinkage problems.
Aqueous slurry in the process of coating and drying to produce the problem such as shrinkage cavity, sag is more, the main reason is that the water's surface tension is bigger (about 72 dyne/m), and the aluminum foil tension between 30 ~ 40 dyne/m. To maintain the size and the aluminum foil substrate wetting, need to join the substrate wetting agent, flow ping agent such as fertilizer, to reduce the surface tension of paste, and in the process of moisture volatilizes to moisturize, steady flow and peaceful.
Such auxiliaries are dominated by polyether siloxane, but silicone auxiliaries migrate to the coating surface and affect the adhesion of the layers. There are also many silicon - free additives such as polyether ethyl nonylphenol, fluorocarbon polymer and acrylic fluid, etc.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
There is a large amount of adhesive in the conductive coating, resulting in a larger surface resistance. In order to guarantee the adhesion of the coating, it is often added 40 wt % of the agent to produce the larger surface resistance. Many methods have been used to prepare carbon/aluminum composite materials, and realize the chemical action of aluminum foil and carbon directly. Such as carbon black coating under N2 atmosphere in 400 ~ 600 ° C carbide processing, surface generation Al4C3.
Lv mingzhe et al. used carbon coated aluminum foil to heat treatment under the atmosphere of hydrocarbons. Aluminum - carbon compounds were formed between aluminum foil and carbon coating as the connection phase to improve adhesion and reduce internal resistance. But these methods are difficult to process, high production cost.
Insufficient stock stability. The water-based coating of carbon material is very strict with the particle size of carbon materials, usually at the nanometer level, which is easy to reunite when the particle is placed in static position. In order to increase the stability, the dispersants are often added, but the amount of dispersants is too much to affect the resistance and adhesion properties of the slurry.
At the same time, the addition of water-based resin, thickening agent and other additives can also make dispersants free of carbon and accelerate the reunion process. Some studies have directly grafted hydrophilic groups on carbon black to improve their hydrophilicity to improve dispersion stability. The development of carbon materials with wetting and conductive properties is a promising direction for the preparation of conductive coatings for water-based carbon.
The technical problem of water based sizing is more. In the slurry stage, the bubbles, the shrinkage cavity, the flow and the wetting etc. The defects in the process of breaking water paint are the problems of the whole coating field. The characteristics of high conductivity, low impurity content and thin coating thickness have brought new challenges to the research and development of water-based carbon coatings.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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