News Details
Introduction of paint crosslinking agent
2017-5-25 11:47:48
Introduction of paint crosslinking agent,It can improve the tensile strength and hardness of the paint film, and also improve the water resistance. But too much will make the emulsion crosslinking density of the glass transition temperature is too high, is not conducive to the paint film and reduce the toughness, therefore, should choose appropriate dosage, make water paint various aspects to achieve optimal performance.
Experiment on the performance test of water-borne wood lacquer
Minimum film temperature MFFT: using the lowest form of the film, KQDM -03, according to the standard operating procedure of the instrument, the preparation of water based varnish is measured.
Surface hardness testing: the standard GB/T 6739-1996 test is applied to the coating.
(3) surface toughness test: water-based paint spraying on the pine wood, after completely dry, after 80 ℃ for 1 hour, 1 hour into - 10 ℃ environment and so on 10 times, observe whether the paint cracking.
(4) film tensile strength test: water-based varnish will be diluted to mass fraction is 20% solid content, into the size of 90 mm x 90 mm x 6 mm of ptfe mold, drying under 45 ℃ for 24 hours, and then according to the national standard GB/T 16421-1996 film cut into type II dumbbell specimens, use SLD - 500 - d electronic universal testing machine to test the tensile strength
(5) film water resistance test: production of wood samples, after 2 hours at 80 ℃ hot water soaking, observe white falls off.
Water based wood lacquer
The effect of glass temperature on film performance. It is difficult to achieve 2H on the hardness of the surface of the paint, which is the important reason for its development. The glass transition temperature of the emulsion is to determine the decisive factors in surface hardness, therefore, the partial products can choose glass transition temperature of 80 ℃ or more of the emulsion.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
The preparation of wood coatings, though has obvious improvement in terms of hardness, but high glass transition temperature also brought film-forming temperature on the high side, film-forming additives added too much problem, and the wood has the characteristics of heat bilges cold shrink, the paint will be burst of high rigidity; In consideration of surface hardness, film forming temperature and surface toughness, etc., this paper determined emulsion asked the glass transition temperature of 60 ℃, its comprehensive performance is the most balanced.
The effect of emulsifier on particle size and film temperature. Emulsifier as one of the most important components of emulsion polymerization, although it does not directly participate in chemical reactions, but the type and dosage of chain will directly influence the trigger rate and growth rate, but also affect the final polymer properties of the polymer molecular weight and its distribution, and impact is related to the emulsion properties of latex particle concentration, the latex particle size and its distribution, and so on.
Therefore, emulsifiers not only affect the stability of the emulsion polymerization system directly, but also have a great influence on the hardness, film velocity and film temperature of the water-based coating.
Below this article selects the three kinds of anionic emulsifier, respectively is sodium dodecyl sulfate (K12), sodium dodecyl diphenyl ether disulfonic acid (a1), alkyl alcohol polyoxyethylene (3) ammonium sulfate salt (28 a), a compound emulsifier. Quantitative experiment for the dosage of emulsifier 1.5%, glass transition temperature of 60 ℃, discussed the different proportion of compound emulsifier on the properties of the emulsion, the results as shown in table 3:
The effect of different anionic emulsifiers on emulsion. Separately using anionic emulsifier, emulsion with calcium ion stability and freeze-thaw stability is very poor, the impact on the stability of the system after paint, in the storage stability of water-based paint also have defects, should match the non-ionic emulsifier is used.
Also found at the same time, with EO block of 28 a emulsifier have significantly lower in terms of the minimum film-forming temperature, this is because the EO block has a certain amount of chain transfer effect, the molecular weight of the copolymer obtained relatively lower, it will make the emulsion of Tg has certain decline, at the same time EO block has internal plasticization effect, so the minimum film-forming temperature lower than the other two kinds of emulsifiers.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Experiment on the performance test of water-borne wood lacquer
Minimum film temperature MFFT: using the lowest form of the film, KQDM -03, according to the standard operating procedure of the instrument, the preparation of water based varnish is measured.
Surface hardness testing: the standard GB/T 6739-1996 test is applied to the coating.
(3) surface toughness test: water-based paint spraying on the pine wood, after completely dry, after 80 ℃ for 1 hour, 1 hour into - 10 ℃ environment and so on 10 times, observe whether the paint cracking.
(4) film tensile strength test: water-based varnish will be diluted to mass fraction is 20% solid content, into the size of 90 mm x 90 mm x 6 mm of ptfe mold, drying under 45 ℃ for 24 hours, and then according to the national standard GB/T 16421-1996 film cut into type II dumbbell specimens, use SLD - 500 - d electronic universal testing machine to test the tensile strength
(5) film water resistance test: production of wood samples, after 2 hours at 80 ℃ hot water soaking, observe white falls off.
Water based wood lacquer
The effect of glass temperature on film performance. It is difficult to achieve 2H on the hardness of the surface of the paint, which is the important reason for its development. The glass transition temperature of the emulsion is to determine the decisive factors in surface hardness, therefore, the partial products can choose glass transition temperature of 80 ℃ or more of the emulsion.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
The preparation of wood coatings, though has obvious improvement in terms of hardness, but high glass transition temperature also brought film-forming temperature on the high side, film-forming additives added too much problem, and the wood has the characteristics of heat bilges cold shrink, the paint will be burst of high rigidity; In consideration of surface hardness, film forming temperature and surface toughness, etc., this paper determined emulsion asked the glass transition temperature of 60 ℃, its comprehensive performance is the most balanced.
The effect of emulsifier on particle size and film temperature. Emulsifier as one of the most important components of emulsion polymerization, although it does not directly participate in chemical reactions, but the type and dosage of chain will directly influence the trigger rate and growth rate, but also affect the final polymer properties of the polymer molecular weight and its distribution, and impact is related to the emulsion properties of latex particle concentration, the latex particle size and its distribution, and so on.
Therefore, emulsifiers not only affect the stability of the emulsion polymerization system directly, but also have a great influence on the hardness, film velocity and film temperature of the water-based coating.
Below this article selects the three kinds of anionic emulsifier, respectively is sodium dodecyl sulfate (K12), sodium dodecyl diphenyl ether disulfonic acid (a1), alkyl alcohol polyoxyethylene (3) ammonium sulfate salt (28 a), a compound emulsifier. Quantitative experiment for the dosage of emulsifier 1.5%, glass transition temperature of 60 ℃, discussed the different proportion of compound emulsifier on the properties of the emulsion, the results as shown in table 3:
The effect of different anionic emulsifiers on emulsion. Separately using anionic emulsifier, emulsion with calcium ion stability and freeze-thaw stability is very poor, the impact on the stability of the system after paint, in the storage stability of water-based paint also have defects, should match the non-ionic emulsifier is used.
Also found at the same time, with EO block of 28 a emulsifier have significantly lower in terms of the minimum film-forming temperature, this is because the EO block has a certain amount of chain transfer effect, the molecular weight of the copolymer obtained relatively lower, it will make the emulsion of Tg has certain decline, at the same time EO block has internal plasticization effect, so the minimum film-forming temperature lower than the other two kinds of emulsifiers.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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