News Details
Water based polyurethane coating crosslinking agent
2017-5-21 23:47:35
Water based polyurethane coating crosslinking agent
On the market at present common one-component waterborne PU coating agent, multi-purpose small molecule crosslinking of high molecular weight polyurethane crosslinking agent, or direct the preparation of high molecular weight of one-component PU [1]. The process is generally exist the following problems: the synthesis of high molecular weight of PU, in the late of polymerization, reaction system of high viscosity, mixing and heat transfer is difficult, easy to produce gel, the operation and control difficulty, and high viscosity PU emulsion of harder.
Acetone method can solve these problems, but must use a lot of organic solvent [1], solvent recovery and purification technology of complex, equipment investment and production cost, and low efficiency of the reactor, easy to cause environmental pollution; In the preparation of a water-borne emulsion of single component polyurethane, it must also consider the compatibility between the crosslinking agent and the PU and the water.
To solve the above problems, this experiment will polyacrylonitrile hydrolysate amino PU pre polymers (HPAN) with multiterminal via reactive blending in room temperature and generate the stability of polymer carboxylic acid ammonium salt in the water. The carboxylic acid ammonium salt after coating, drying, baking, carboxylic acid ammonium salt heat generated after dehydration amide, made with waterproof and moisture permeable properties of PU coating. The coating is mainly through the mechanism of waterproof and moisture permeable breathability.
With the process of preparation of coating cloth, resistance to water pressure value of about 6370 pa, moisture transmission is about 2558 g/m2, d. contrast test of domestic ordinary water about 4600 pa, PU coating resistant to water pressure moisture transmission of about 2100 g/m2, d. if use acrylic waste/rubber as raw material preparation HPAN, and can greatly reduce the production cost of PU coating agent.
The main raw material of the experiment. Polyethylene glycol (PEG) : industrial grade; Polypropylene glycol (PPG) : industrial grade; 2, 4-toluene diisocyanate (TD1) : analytical; DEOA: analytical pure; Waterproof finishing agent AG480: iron anchor 101 adhesives, interlinked agent EH, hexahydroxy melamine (HMM) : the sealing agent DK, cross-linking agent polyacrylonitrile hydrolysate HPAN (including 10% solid).
Instrument: YG812 fabric seepage tester; The dl302-1 thermostat.
A PU prepolymer with amino. Add the accurate weighing of PEG, the mixture of PPG flask, vacuum dewatering under 120 ℃, 9.3 x 104 pa 1.5 h; And then cooled to 50 ℃, its input - quantitative TDI, 95 ℃ in the oil bath heating, stirring after 1.5 h, according to the need, 50 ℃ to join chain extender reaction 0.5 h at room temperature with excessive homemade end capping agent DK will residual isocyanate reaction finished, add water after get the amino PU pre polymers.
Single component polyurethane lotion. At room temperature, to add - quantitative HPAN 1.2.1 reaction system, after thickening to mix - viscosity, which made the self-crosslinking emulsion polyurethane water 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.
Base fabric for the waterproofing agent AG480 solution treatment, amounting to 1% of the (two dip two rolling), 1.2 in the preparation of self-crosslinking PU emulsion evenly coated on the base cloth, cloth sample drying under 100 ℃, the curing after crosslinking was coated fabric.
To test the waterproof properties of the coating cloth with the fabric seepage tester; The moisture permeability of the coating cloth was tested by the wet cup method, and the sample was tested three times, and the average was calculated.
Q is equal to delta W times 24 over A times t.
In the form of Q, the amount of moisture per g times g times d minus one; W/g/g; A, moisture absorption area of m2. T hygroscopic time/h.
N (-nc0) : n (-0h) the effect of the PU prepolymer on emulsifying ability. PU of the emulsion is helpful to simplify the preparation technology of coating agent, reduce the cost. The performed the reaction, in m (PPG1000) : m (PEG) = 70: a mixture of 30 as polyol component, analysis of n (- NC0) : n (0 h) impact on self emulsifying ability in the process of the polymers.
N (-nc0) : n (-0h) : n (-0h)) higher than 1.4:1, which is a better distributed PU emulsion. N (-nc0) : n (-0h) : 1.4:1, the resulting PU forms a common emulsion in the water; N (-nc0) : n (-0h) -1.1-1, the resulting PU prepolymer cannot be emulsified in water.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
On the market at present common one-component waterborne PU coating agent, multi-purpose small molecule crosslinking of high molecular weight polyurethane crosslinking agent, or direct the preparation of high molecular weight of one-component PU [1]. The process is generally exist the following problems: the synthesis of high molecular weight of PU, in the late of polymerization, reaction system of high viscosity, mixing and heat transfer is difficult, easy to produce gel, the operation and control difficulty, and high viscosity PU emulsion of harder.
Acetone method can solve these problems, but must use a lot of organic solvent [1], solvent recovery and purification technology of complex, equipment investment and production cost, and low efficiency of the reactor, easy to cause environmental pollution; In the preparation of a water-borne emulsion of single component polyurethane, it must also consider the compatibility between the crosslinking agent and the PU and the water.
To solve the above problems, this experiment will polyacrylonitrile hydrolysate amino PU pre polymers (HPAN) with multiterminal via reactive blending in room temperature and generate the stability of polymer carboxylic acid ammonium salt in the water. The carboxylic acid ammonium salt after coating, drying, baking, carboxylic acid ammonium salt heat generated after dehydration amide, made with waterproof and moisture permeable properties of PU coating. The coating is mainly through the mechanism of waterproof and moisture permeable breathability.
With the process of preparation of coating cloth, resistance to water pressure value of about 6370 pa, moisture transmission is about 2558 g/m2, d. contrast test of domestic ordinary water about 4600 pa, PU coating resistant to water pressure moisture transmission of about 2100 g/m2, d. if use acrylic waste/rubber as raw material preparation HPAN, and can greatly reduce the production cost of PU coating agent.
The main raw material of the experiment. Polyethylene glycol (PEG) : industrial grade; Polypropylene glycol (PPG) : industrial grade; 2, 4-toluene diisocyanate (TD1) : analytical; DEOA: analytical pure; Waterproof finishing agent AG480: iron anchor 101 adhesives, interlinked agent EH, hexahydroxy melamine (HMM) : the sealing agent DK, cross-linking agent polyacrylonitrile hydrolysate HPAN (including 10% solid).
Instrument: YG812 fabric seepage tester; The dl302-1 thermostat.
A PU prepolymer with amino. Add the accurate weighing of PEG, the mixture of PPG flask, vacuum dewatering under 120 ℃, 9.3 x 104 pa 1.5 h; And then cooled to 50 ℃, its input - quantitative TDI, 95 ℃ in the oil bath heating, stirring after 1.5 h, according to the need, 50 ℃ to join chain extender reaction 0.5 h at room temperature with excessive homemade end capping agent DK will residual isocyanate reaction finished, add water after get the amino PU pre polymers.
Single component polyurethane lotion. At room temperature, to add - quantitative HPAN 1.2.1 reaction system, after thickening to mix - viscosity, which made the self-crosslinking emulsion polyurethane water 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.
Base fabric for the waterproofing agent AG480 solution treatment, amounting to 1% of the (two dip two rolling), 1.2 in the preparation of self-crosslinking PU emulsion evenly coated on the base cloth, cloth sample drying under 100 ℃, the curing after crosslinking was coated fabric.
To test the waterproof properties of the coating cloth with the fabric seepage tester; The moisture permeability of the coating cloth was tested by the wet cup method, and the sample was tested three times, and the average was calculated.
Q is equal to delta W times 24 over A times t.
In the form of Q, the amount of moisture per g times g times d minus one; W/g/g; A, moisture absorption area of m2. T hygroscopic time/h.
N (-nc0) : n (-0h) the effect of the PU prepolymer on emulsifying ability. PU of the emulsion is helpful to simplify the preparation technology of coating agent, reduce the cost. The performed the reaction, in m (PPG1000) : m (PEG) = 70: a mixture of 30 as polyol component, analysis of n (- NC0) : n (0 h) impact on self emulsifying ability in the process of the polymers.
N (-nc0) : n (-0h) : n (-0h)) higher than 1.4:1, which is a better distributed PU emulsion. N (-nc0) : n (-0h) : 1.4:1, the resulting PU forms a common emulsion in the water; N (-nc0) : n (-0h) -1.1-1, the resulting PU prepolymer cannot be emulsified in water.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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