News Details
Functional water-based polyurethane coating crosslinking agent
2017-6-11 23:52:15
Functional water-based polyurethane coating crosslinking agent
Waterborne polyurethane (WPU) with water as dispersion medium (instead of organic solvent) of environmentally friendly materials, with its preparation of the coating is widely used in textile, leather, wood, plastic, building, paper making, automotive and industrial maintenance, and other fields.
However, due to the hydrophilic group, water-borne polyurethane is introduced in water resistance, solvent resistance, weatherability, poor performance, the drying speed and so on limits its application scope.
In order to satisfy people's demand for environment-friendly functional coatings, the researchers through the study of the molecular structure design of waterborne polyurethane, compound modification, synthesis process and film forming methods of technical improvement, the preparation of the special performance of water-based coating in response to market demand, such as polyol molecular design on the molecular scale, or to specific molecular structure (or elements) polyols are introduced to change the macromolecular main chain structure, or nano composite modification on the micro scale, or in the crosslinking modification of film forming process to introduce specific functional groups, such as a variety of methods to enhance the function of the waterborne polyurethane coatings.
Through the functional design of the preparation of functional water-based polyurethane coating has a generic type that the performance of waterborne polyurethane coatings such as graffiti proof, anticorrosion, mouldproof sterilization, flame retardant, transparent, heat insulation and other special performance. This study mainly introduces the functional design, synthesis technology and application progress of water performance polyurethane coating.
Synthetic technology of functional water-based polyurethane. Functional WPU using its molecular structure can be cut, combined with new synthetic and crosslinking technology, make the performance of the WPU coatings to achieve even better than the traditional solvent-based polyurethane coatings. The synthesis technology and technology of the functional WPU are more complex, and generally divided into several methods.
Design and application of functional water-based polyurethane. The function of WPU is to connect functional small molecules with WPU skeletons, with a chemical connection and physical connection.
Chemical connections are used to introduce active functional bases on WPU skeletons, thus changing the physical chemistry of WPU and giving them new functions. The physical connection is achieved through the combination of small molecule functions and WPU. Through the design of the WPU, it can be prepared with special performance, such as fire retardant, anti-corrosion, anti-mildew, anti-graffiti and transparent insulation, 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
Halogen flame-retardant water-based polyurethane coating. Introduced in the WPU molecules containing halogen, N, P and other groups can improve the flame retardancy of WPU, can also by adding organic silicone oligomer to modification of WPU, make its thermal stability have larger increase.
Chen He will contain bromine to dibromo neopentyl glycol (DBNPG) as hard segment, the introduction of WPU chain preparation out of the water containing halogen flame retardant polyurethane emulsion stability is good, bibulous rate is significantly reduced, the oxygen index test showed that DBNPG dosage of modified waterborne polyurethane is 15% oxygen index has reached 29.6%, in the preparation of the coating has good flame retardancy.
No halogenated flame retardant type polyurethane coating. The expansive type flame retardant has the characteristics of no halogen, low smoke, low poison, etc., it is the current application of the more extensive non-halogen flame retardant coating.
In this paper, the performance differences of water based polyurethane coating expansions and non-expansive flame retardant systems were studied. The expansive flame retardant system selects the app-per-mel compound inflating flame retardant system, and the non-expansive flame retardant system chooses Mg (OH) 2 Al/(OH) 3.
The test results found that the app-per-mel inflating flame retardant system was better than the Mg (OH) 2 / Al (OH) 3 non-expansive flame retardant system against WPU coatings.
App-per-mel adds a 50 PER cent carbon time of 263s, while the same added Mg (OH) 2 / Al (OH) 3 system is only 123s. By modifying WPU with acrylate, and then adding melamine and pentaerythritol, the flame retardant properties of the coating were obviously improved and the water resistance was not destroyed.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Waterborne polyurethane (WPU) with water as dispersion medium (instead of organic solvent) of environmentally friendly materials, with its preparation of the coating is widely used in textile, leather, wood, plastic, building, paper making, automotive and industrial maintenance, and other fields.
However, due to the hydrophilic group, water-borne polyurethane is introduced in water resistance, solvent resistance, weatherability, poor performance, the drying speed and so on limits its application scope.
In order to satisfy people's demand for environment-friendly functional coatings, the researchers through the study of the molecular structure design of waterborne polyurethane, compound modification, synthesis process and film forming methods of technical improvement, the preparation of the special performance of water-based coating in response to market demand, such as polyol molecular design on the molecular scale, or to specific molecular structure (or elements) polyols are introduced to change the macromolecular main chain structure, or nano composite modification on the micro scale, or in the crosslinking modification of film forming process to introduce specific functional groups, such as a variety of methods to enhance the function of the waterborne polyurethane coatings.
Through the functional design of the preparation of functional water-based polyurethane coating has a generic type that the performance of waterborne polyurethane coatings such as graffiti proof, anticorrosion, mouldproof sterilization, flame retardant, transparent, heat insulation and other special performance. This study mainly introduces the functional design, synthesis technology and application progress of water performance polyurethane coating.
Synthetic technology of functional water-based polyurethane. Functional WPU using its molecular structure can be cut, combined with new synthetic and crosslinking technology, make the performance of the WPU coatings to achieve even better than the traditional solvent-based polyurethane coatings. The synthesis technology and technology of the functional WPU are more complex, and generally divided into several methods.
Design and application of functional water-based polyurethane. The function of WPU is to connect functional small molecules with WPU skeletons, with a chemical connection and physical connection.
Chemical connections are used to introduce active functional bases on WPU skeletons, thus changing the physical chemistry of WPU and giving them new functions. The physical connection is achieved through the combination of small molecule functions and WPU. Through the design of the WPU, it can be prepared with special performance, such as fire retardant, anti-corrosion, anti-mildew, anti-graffiti and transparent insulation, 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
Halogen flame-retardant water-based polyurethane coating. Introduced in the WPU molecules containing halogen, N, P and other groups can improve the flame retardancy of WPU, can also by adding organic silicone oligomer to modification of WPU, make its thermal stability have larger increase.
Chen He will contain bromine to dibromo neopentyl glycol (DBNPG) as hard segment, the introduction of WPU chain preparation out of the water containing halogen flame retardant polyurethane emulsion stability is good, bibulous rate is significantly reduced, the oxygen index test showed that DBNPG dosage of modified waterborne polyurethane is 15% oxygen index has reached 29.6%, in the preparation of the coating has good flame retardancy.
No halogenated flame retardant type polyurethane coating. The expansive type flame retardant has the characteristics of no halogen, low smoke, low poison, etc., it is the current application of the more extensive non-halogen flame retardant coating.
In this paper, the performance differences of water based polyurethane coating expansions and non-expansive flame retardant systems were studied. The expansive flame retardant system selects the app-per-mel compound inflating flame retardant system, and the non-expansive flame retardant system chooses Mg (OH) 2 Al/(OH) 3.
The test results found that the app-per-mel inflating flame retardant system was better than the Mg (OH) 2 / Al (OH) 3 non-expansive flame retardant system against WPU coatings.
App-per-mel adds a 50 PER cent carbon time of 263s, while the same added Mg (OH) 2 / Al (OH) 3 system is only 123s. By modifying WPU with acrylate, and then adding melamine and pentaerythritol, the flame retardant properties of the coating were obviously improved and the water resistance was not destroyed.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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