News Details
Polyurethane dispersion coating crosslinking agent
2017-6-17 11:43:52
Polyurethane dispersion coating crosslinking agent
In the molecular structure of polyurethane is a kind of macromolecular compound with carbamate, usually made from diisocyanate and polyol poly addition reaction.
Polyurethane polymers have the polar functional groups that make them physical, and have non-polar and flexible segments. With proper use, the polar tube can also conduct further chemical crosslinking. These molecular properties make polyurethane material high in strength, toughness and solvent. Polyurethane as a kind of high strength, good weatherability, good adhesion high quality materials, has been widely used in the coating field.
In water-based paint formula, the substrate is the key component to form the paint film and determine the performance of the film. Formulation design of water-based resin dosage should be increased, and the accounts for 60-70% of volume ratio, make the effective film forming matter content in the liquid paint as much as possible, so as to ensure the lacquer is made a coating film is thick, high fullness.
Acrylic emulsion, acrylic emulsions), due to its generality, weatherability and diversity, it has been widely in the areas of coating industry application. Water-based acrylic emulsion is formed by latex polymerization of the vinyl monomer with acrylic monomer. Various additives such as emulsifier, stabilizer and pH modulator are added to the polymerization process, and the system is quite complex. The paint film made of water-based acrylic emulsion has good weatherability, not easy to yellow hair, high hardness, good gloss.
In recent years, with the continuous development of water-based acrylic emulsion polymerization technology, heterogeneous polymerization, the core-shell technology, since the crosslinking technology and application of polymeric surfactants, and core-shell polymerization technology improvement and further improve the properties of waterborne acrylic emulsion, and that the water-based acrylic emulsion adapt to different construction and the needs of the conditions of use, place continuously expanding. Applications of water-based acrylic latex have now been extended to industrial applications that require higher performance requirements.
According to the type of isocyanate used in the preparation of polyurethane, the polyurethane emulsion and the corresponding lacquer can be classified into two types: adipose type and aromatic type. The coatings of fatty people have excellent weathering and anti-yellowing. Aromatic water-based polyurethane is used for interior decoration. The particle size of polymerization is polyurethane emulsion and polyurethane dispersion.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
Water-based polyurethane dispersant, with unique process, can disperse polyurethane particles in water, which can be used as the carrier of water. Similar to other emulsion forming mechanisms, the effect of the film is determined by the ability of intergranular polymers to penetrate each other.
To increase penetration, the polyurethane chains should be soft and liquid. On the other hand, the emulsion particles should be as small as possible, thus increasing the contact area between the particles and reducing the distance of the polymer. The water-based polyurethane dispersion usually has a nano-scale particle size, translucent and completely transparent, which is one of the best water-based paint base materials. A water-based polyurethane dispersant is sometimes referred to as a nano-emulsion to distinguish it from a plain white emulsion.
The main reason for the introduction of polyacrylate latex into the monomer is that it provides a high glass retweeting temperature (Tg), which increases the hardness of the film. Another reason is cost. The use of styrene in the packaging industry is the most important in the petroleum industry, one of the mature downstream products, which is low in price but greatly influenced by the macro-economy.
However, the introduction of styrene, especially if it is more than 15% of the total amount of the total monomer, also has a lot of negative effects on the film's ability to film.
First, the polymer chain, containing styrene, lacks flexibility, and is characterized by a rigid, flexible membrane. Also contains benzene, styrene is ultraviolet absorber, the monomer content high, the ultraviolet ray through the adjacent benzene ring has the shear response of polymer chains, so that water-based paint film brittle, gloss, life; The structure of styrene also determines that it has an affinity for many organic solvents, and there is no significant difference between the solvents and other resins of the paint film.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
In the molecular structure of polyurethane is a kind of macromolecular compound with carbamate, usually made from diisocyanate and polyol poly addition reaction.
Polyurethane polymers have the polar functional groups that make them physical, and have non-polar and flexible segments. With proper use, the polar tube can also conduct further chemical crosslinking. These molecular properties make polyurethane material high in strength, toughness and solvent. Polyurethane as a kind of high strength, good weatherability, good adhesion high quality materials, has been widely used in the coating field.
In water-based paint formula, the substrate is the key component to form the paint film and determine the performance of the film. Formulation design of water-based resin dosage should be increased, and the accounts for 60-70% of volume ratio, make the effective film forming matter content in the liquid paint as much as possible, so as to ensure the lacquer is made a coating film is thick, high fullness.
Acrylic emulsion, acrylic emulsions), due to its generality, weatherability and diversity, it has been widely in the areas of coating industry application. Water-based acrylic emulsion is formed by latex polymerization of the vinyl monomer with acrylic monomer. Various additives such as emulsifier, stabilizer and pH modulator are added to the polymerization process, and the system is quite complex. The paint film made of water-based acrylic emulsion has good weatherability, not easy to yellow hair, high hardness, good gloss.
In recent years, with the continuous development of water-based acrylic emulsion polymerization technology, heterogeneous polymerization, the core-shell technology, since the crosslinking technology and application of polymeric surfactants, and core-shell polymerization technology improvement and further improve the properties of waterborne acrylic emulsion, and that the water-based acrylic emulsion adapt to different construction and the needs of the conditions of use, place continuously expanding. Applications of water-based acrylic latex have now been extended to industrial applications that require higher performance requirements.
According to the type of isocyanate used in the preparation of polyurethane, the polyurethane emulsion and the corresponding lacquer can be classified into two types: adipose type and aromatic type. The coatings of fatty people have excellent weathering and anti-yellowing. Aromatic water-based polyurethane is used for interior decoration. The particle size of polymerization is polyurethane emulsion and polyurethane dispersion.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
Water-based polyurethane dispersant, with unique process, can disperse polyurethane particles in water, which can be used as the carrier of water. Similar to other emulsion forming mechanisms, the effect of the film is determined by the ability of intergranular polymers to penetrate each other.
To increase penetration, the polyurethane chains should be soft and liquid. On the other hand, the emulsion particles should be as small as possible, thus increasing the contact area between the particles and reducing the distance of the polymer. The water-based polyurethane dispersion usually has a nano-scale particle size, translucent and completely transparent, which is one of the best water-based paint base materials. A water-based polyurethane dispersant is sometimes referred to as a nano-emulsion to distinguish it from a plain white emulsion.
The main reason for the introduction of polyacrylate latex into the monomer is that it provides a high glass retweeting temperature (Tg), which increases the hardness of the film. Another reason is cost. The use of styrene in the packaging industry is the most important in the petroleum industry, one of the mature downstream products, which is low in price but greatly influenced by the macro-economy.
However, the introduction of styrene, especially if it is more than 15% of the total amount of the total monomer, also has a lot of negative effects on the film's ability to film.
First, the polymer chain, containing styrene, lacks flexibility, and is characterized by a rigid, flexible membrane. Also contains benzene, styrene is ultraviolet absorber, the monomer content high, the ultraviolet ray through the adjacent benzene ring has the shear response of polymer chains, so that water-based paint film brittle, gloss, life; The structure of styrene also determines that it has an affinity for many organic solvents, and there is no significant difference between the solvents and other resins of the paint film.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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