CN100494299C - Natural macromolecular composite aqueous polyurethane bond and its preparation method - Google Patents
Natural macromolecular composite aqueous polyurethane bond and its preparation method Download PDFInfo
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Abstract
The invention relates the natural high polymer composite water-based polyurethane binder and preparing method. The high polymer composite water-based polyurethane binder comprises 40-100% A water solution and 10-25% water-based polyurethane emulsion. The mass ratio of A mass percent and solid constituent is 20-80%, and the ratio of water-based polyurethane emulsion and solid constituent is 20-80%. The mass ratio of A and water-based polyurethane emulsion is 30-40%. The A comprises fecula, soy protein, modified starch, and modified soy protein. The product has the advantages of high bonding capacity, low cost, biodegradability, environmental protection and simple technology.
Description
Technical field
The present invention relates to a kind of natural macromolecular composite aqueous polyurethane bond and preparation method thereof, belong to the natural macromolecular material field, also belong to environmental friendliness ecomaterial field.
Background technology
Starch is the product of photosynthesis of plant, is one of the abundantest natural polymer child resource, has inexpensive, renewable, advantages of environment protection.Soy-protein is the byproduct after the soybean extract oil, and is cheap, have biological activity and function preferably, and major part is used for foodstuffs industry, also is applied in material fields such as tackiness agent, degradative plasticss.Recently, because growing tension, crude oil price continuous rise and the problem of environmental pollution of petroleum resources, based on the research of the natural macromolecular material of renewable resources with use and extensively paid attention to.The bond properties of starch and soybean protein is applied very early, but there is the shortcoming of bond strength and water resistance difference in they as tackiness agent, and main thought is to prepare starch or the soy protein adhesive with higher using value by the method modification of physics and chemistry at present.Starch and polyurethane binder is compound, and the hydroxyl of starch has certain influence (Int.J.Adhes.Adhes., 2003,23,393-399 to the performance of polyurethane binder; Chinese patent: 200510016573).Utilize the tackiness agent of different types of starch conversion, find that starch structure has remarkable influence (Biores.Technol., 1997,62,63-65 to performance; 2000,72,193-196), starch is carried out introducing bonder system after the modifications such as oxidation, gelatinization in addition, can be at the performance (Chinese patent: 96118937 of consumption that to a certain degree improves starch and tackiness agent; Chinese patent: 200410023343).Carry out blend by soybean protein and water-based are strengthened resin, obtain all wood adhesive (United States Patent (USP)s: US0089418A1) preferably of bond strength and water resistance.
Summary of the invention
The object of the present invention is to provide a kind of adhesiveproperties height, with low cost, biodegradable natural macromolecular composite aqueous polyurethane bond and preparation method thereof.
To achieve these goals, the technical solution adopted in the present invention is as follows: a kind of natural macromolecular composite aqueous polyurethane bond is characterized in that it is that the substance A aqueous solution of 40-100% and aqueous polyurethane emulsion blend that mass concentration is 10-25% make by mass concentration; Mass concentration is that the mass percent that substance A accounts for all solids component in the substance A aqueous solution of 40-100% and the aqueous polyurethane emulsion that mass concentration is 10-25% is 20-80, and the mass percent that aqueous polyurethane accounts for all solids component is 20-80; Simultaneously to account for the mass percent that the substance A aqueous solution that mass concentration is 40-100% and mass concentration be the aqueous polyurethane emulsion of 10-25% be 30-40 for substance A and aqueous polyurethane (all solids component); Wherein, substance A is any one or any one the above mixing in starch, soybean protein, treated starch (or claiming starch conversion thing), the modified soy protein, is any proportioning during any one above mixing.
Described starch is W-Gum, wheat starch, potato starch (comprising yam starch, tapioca (flour), sweet potato starch etc.), legume starch various natural plant starch such as (comprising pea starch, green starch etc.).
Described soybean protein is any one or any one the above mixing in soybean protein isolate, soybean apolipoprotein, the soybean residue, is any proportioning during any one above mixing.
Described treated starch comprises acidifying, alkalization, oxidation, esterification, etherificate, acidylate, crosslinked and grafting, copolymerization and modification thing.
Described modified soy protein comprises the product of soybean protein by acidifying, alkalization, oxidation, esterification, etherificate, acidylate, crosslinked, grafting, copolymerization and modification.
The preparation method of above-mentioned a kind of natural macromolecular composite aqueous polyurethane bond is characterized in that it comprises the steps:
1). choose the aqueous polyurethane emulsion that mass concentration is 10-25%, standby;
2). substance A is made into the substance A aqueous solution that mass concentration is 40-100%, and substance A is any one or any one the above mixing in starch, soybean protein, treated starch, the modified soy protein, is any proportioning during any one above mixing;
3). in mass concentration is that the substance A aqueous solution and the mass concentration of 40-100% is in the aqueous polyurethane emulsion of 10-25%, the mass percent that accounts for all solids component by substance A is 20-80, the mass percent that aqueous polyurethane accounts for all solids component is that 20-80 chooses the substance A aqueous solution, aqueous polyurethane emulsion, and simultaneously to account for the mass percent of the aqueous polyurethane emulsion blend total mass that the substance A aqueous solution that mass concentration is 40-100% and mass concentration be 10-25% be 30-40 for substance A and aqueous polyurethane; Blend makes natural macromolecular composite aqueous polyurethane bond.
The preparation of described aqueous polyurethane emulsion: by polyisocyanates and polyether glycol, perhaps polyisocyanates and polyester polyol, or polyisocyanates and polyethers and polyester polyol were reaction in 50-90 ℃ of stirring reaction 1-5 hour, wherein, a, the mass percent of polyisocyanates and polyether glycol is: polyisocyanates 65-90, polyether glycol 10-35, b, the mass percent of polyisocyanates and polyester polyol is: polyisocyanates 65-90, polyester polyol 10-35, c, the mass percent of polyisocyanates and polyethers and polyester polyol is: polyisocyanates 65-90, polyethers and polyester polyol 10-35, polyethers and polyester polyol with any than mixing; Carry out chain extension and crosslinked with the multiple functional radical small molecules that contains the carboxylated hydrophilic group again, wherein, the multiple functional radical small molecules is any one or any one the above mixing in dibasic alcohol, diamine, trivalent alcohol, the tertiary amine, is any proportioning during any one above mixing; The micromolecular add-on of multiple functional radical that contains the carboxylated hydrophilic group is the 10-50% of polyisocyanates; Its last NCO/OH mol ratio is 1.0-3.5, in the chainextender in [OH] and the polyvalent alcohol [OH] mol ratio be 1.0-3.5; Add neutralization reagent then, regulating pH value be 6.5-7.5, in water-dispersion on the rocks again below the 5-10 minute postcooling to 40 ℃, must aqueous polyurethane emulsion, the quality of solid content is 10-25%;
It is the substance A aqueous solution of 40-100% and the aqueous polyurethane emulsion blend that mass concentration is 10-25% that the present invention adopts by mass concentration, substance A is any one or any one the above mixing in starch, soybean protein, treated starch, the modified soy protein, hydroxyl reaction in the polyaminoester emulsion on the isocyanate-terminated aqueous polyurethane emulsion commaterial A of getting produces crosslinked, with this bond strength and water resistance that improves tackiness agent, the present invention has improved adhesiveproperties.The used substance A of the present invention, raw materials cost is cheap, and biodegradable; Adopt water as solvent, technology is simple, environmental protection, does not use formaldehyde can eliminate the harm of formaldehyde to human body fully, can satisfy the demand of modern society to healthy and environmental protection; Therefore, the present invention has with low cost, advantages of environment protection.The present invention can be used for the bonding of multiple materials such as timber, paper, metal, glass.
Embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.
Embodiment 1:
A kind of preparation method of natural macromolecular composite aqueous polyurethane bond, it comprises the steps:
1). the preparation of aqueous polyurethane emulsion: with the polyoxypropyleneglycol (molecular weight 2000 of calculated amount; the Zhong Mountain, Nanjing petrochemical industry) with tolylene diisocyanate (TDI; Shanghai chemical reagents corporation of Chinese Medicine group) be blended in 65 ℃ of stirring reactions 2 hours, the mass percent of polyoxypropyleneglycol and tolylene diisocyanate is: polyoxypropyleneglycol 10-35, tolylene diisocyanate 65-90.Add small molecule chain extender DMPA then, the add-on of small molecule chain extender DMPA is the 10-50 of tolylene diisocyanate quality, with temperature regulation to 75 ℃ stirring reaction 1 hour, during use the acetone viscosity reduction, the add-on of acetone is the 5-10% of solid masses.Add in the triethylamine (TEA) of calculated amount and 5 minutes, triethylamine (TEA) add-on identical with the amount of DMPA, reduce the temperature to below 40 ℃ after reaction is finished, under high shear add an amount of frozen water dispersion.Vacuumize then and remove acetone and obtain aqueous polyurethane emulsion.This moment, the proportioning of emulsion was NCO/OH=1.75, and DMPA accounts for 8.0% of solid content, and polyoxypropyleneglycol 2000 content are 65%, and the solid content (quality) of control emulsion is at 10-25%, and is standby.
2). soybean protein is made into the soybean protein aqueous solution that mass concentration is 40-100%, standby.
3). be that the mass percent that soybean protein accounts for all solids component in 25% the aqueous polyurethane emulsion is 25 by soybean protein (being that mass concentration is 100% the soybean protein aqueous solution) and mass concentration, the mass percent that aqueous polyurethane accounts for all solids component is 75 to choose the soybean protein aqueous solution, aqueous polyurethane emulsion, this moment soybean protein and aqueous polyurethane to account for soybean protein and mass concentration be that the mass percent of 25% aqueous polyurethane emulsion is 33.333; Blend makes natural macromolecular composite aqueous polyurethane bond.
Then natural macromolecular composite aqueous polyurethane bond is applied on two planks, the bond area that makes them is on the test panel of 12.5mm * 25mm, keep promptly getting in 5 minutes under 120 ℃ and 1.4MPa testing sheet material, the mechanical property of the sheet material of preparation: shearing resistance (MPa) is 5.84.Mechanical property thinks carefully newly in Shenzhen with reference to ASTM D906 on the CMR6503 instrument of testing tool company and records that rate of extension is 1mm/min.
Embodiment 2:
Substantially the same manner as Example 1, difference is: by mass concentration is that 90% the soybean protein aqueous solution and mass concentration are that the mass percent that soybean protein accounts for all solids component in 25% the aqueous polyurethane emulsion is 50, and the mass percent that aqueous polyurethane accounts for all solids component is 50 to choose the soybean protein aqueous solution, aqueous polyurethane emulsion; This moment soybean protein and aqueous polyurethane to account for soybean protein and mass concentration be that the mass percent of 25% aqueous polyurethane emulsion is 39.133, blend makes natural macromolecular composite aqueous polyurethane bond.Shearing resistance (MPa) is 6.68.
Embodiment 3:
Substantially the same manner as Example 1, difference is: be that the mass percent that soybean protein accounts for all solids component in 10% the aqueous polyurethane emulsion is 75 by soybean protein (being that mass concentration is 100% the soybean protein aqueous solution) and mass concentration, the mass percent that aqueous polyurethane accounts for all solids component is 25 to choose the soybean protein aqueous solution, aqueous polyurethane emulsion.This moment soybean protein and aqueous polyurethane to account for soybean protein and mass concentration be that the mass percent of 10% aqueous polyurethane emulsion is 40, blend makes natural macromolecular composite aqueous polyurethane bond.Shearing resistance (MPa) is 4.81.
By embodiment 1-3 as can be known, the adding of aqueous polyurethane of the present invention all has certain enhancing to the bonding effect of soybean protein, and its shearing resistance is improved, and illustrates that they improve performance to have played reasonable effect.
Embodiment 4:
A kind of preparation method of natural macromolecular composite aqueous polyurethane bond, it comprises the steps:
1). the preparation of aqueous polyurethane emulsion: utilize polyester glycol (molecular weight 2000, Shanghai Gaoqiao petrochemical industry) to replace polyoxypropyleneglycol, other obtain aqueous polyurethane emulsion with embodiment 1.This moment, the proportioning of emulsion was NCO/OH=1.0, and DMPA accounts for 7.5% of solid content, and polyester glycol 2000 content are 65%, and the solid content of control emulsion is 10-25%.
2). choose substance A, substance A is yam starch and soybean protein, yam starch account for yam starch and soybean protein total mass 0,25,50,75 or 100;
3). be that the mass percent that substance A accounts for all solids component in 24% the aqueous polyurethane emulsion is 25 by substance A and mass concentration, the mass percent that aqueous polyurethane accounts for all solids component is 75 to choose the substance A aqueous solution, aqueous polyurethane emulsion, this moment substance A and aqueous polyurethane to account for substance A and mass concentration be that the mass percent of 24% aqueous polyurethane emulsion is 32; Blend makes natural macromolecular composite aqueous polyurethane bond.
Embodiment 5:
Substantially the same manner as Example 4, difference is: be that the mass percent that substance A accounts for all solids component in 15% the aqueous polyurethane emulsion is 50 by substance A and mass concentration, the mass percent that aqueous polyurethane accounts for all solids component is 50 to choose the substance A aqueous solution, aqueous polyurethane emulsion, this moment substance A and aqueous polyurethane to account for substance A and mass concentration be that the mass percent of 24% aqueous polyurethane emulsion is 30; Blend makes natural macromolecular composite aqueous polyurethane bond.
Embodiment 6:
Substantially the same manner as Example 4, difference is: be that the mass percent that substance A accounts for all solids component in 10% the aqueous polyurethane emulsion is 75 by substance A and mass concentration, the mass percent that aqueous polyurethane accounts for all solids component is 25 to choose the substance A aqueous solution, aqueous polyurethane emulsion, this moment substance A and aqueous polyurethane to account for substance A and mass concentration be that the mass percent of 10% aqueous polyurethane emulsion is 40, blend makes natural macromolecular composite aqueous polyurethane bond.
Embodiment 7:
A kind of preparation method of natural macromolecular composite aqueous polyurethane bond, it comprises the steps:
1). the preparation of aqueous polyurethane emulsion: utilize polyoxypropyleneglycol (molecular weight 1000, the Zhong Mountain, Nanjing petrochemical industry) to replace polyoxypropyleneglycol 2000, other obtain aqueous polyurethane emulsion with embodiment 1.This moment, the proportioning of emulsion was NCO/OH=1.5, and DMPA accounts for 8.5% of solid content, and polyoxypropyleneglycol 1000 content are 60%, and the quality of the solid content of control emulsion is at 10-25%.
2). choose yam starch;
3). be that the mass percent that yam starch accounts for all solids component in 25% the aqueous polyurethane emulsion is 20 by yam starch and mass concentration, the mass percent that aqueous polyurethane accounts for all solids component is 80 to choose the yam starch aqueous solution, aqueous polyurethane emulsion, this moment yam starch and aqueous polyurethane to account for yam starch and mass concentration be that the mass percent of 25% aqueous polyurethane emulsion is 31.25; Blend makes natural macromolecular composite aqueous polyurethane bond.
Embodiment 8:
A kind of preparation method of natural macromolecular composite aqueous polyurethane bond, it comprises the steps:
1). choose mass concentration and be 25% aqueous polyurethane emulsion (employing currently available products), standby;
2). choose W-Gum;
3). be that the mass percent that W-Gum accounts for all solids component in 25% the aqueous polyurethane emulsion is 20 by W-Gum and mass concentration, the mass percent that aqueous polyurethane accounts for all solids component is 80 to choose W-Gum, aqueous polyurethane emulsion, and to account for W-Gum and mass concentration be that the mass percent of 25% aqueous polyurethane emulsion is 31.25 for W-Gum and aqueous polyurethane simultaneously; Blend makes natural macromolecular composite aqueous polyurethane bond.
Embodiment 9:
A kind of preparation method of natural macromolecular composite aqueous polyurethane bond, it comprises the steps:
1). choose mass concentration and be 10% aqueous polyurethane emulsion (employing currently available products), standby;
2). substance A is made into the substance A aqueous solution that mass concentration is 70-99%, and substance A is a soybean protein;
3). by mass concentration is that the substance A aqueous solution of 70-99% and mass concentration are that the mass percent that substance A accounts for all solids component in 10% the aqueous polyurethane emulsion is 80, and the mass percent that aqueous polyurethane accounts for all solids component is 20 to choose the substance A aqueous solution, aqueous polyurethane emulsion; Blend makes natural macromolecular composite aqueous polyurethane bond.
Embodiment 10:
A kind of preparation method of natural macromolecular composite aqueous polyurethane bond, it comprises the steps:
1). choose mass concentration and be 15% aqueous polyurethane emulsion (employing currently available products), standby;
2). choose treated starch (adopting currently available products) as modified corn starch;
3). be that the mass percent that treated starch accounts for all solids component in 15% the aqueous polyurethane emulsion is 50 by treated starch and mass concentration, the mass percent that aqueous polyurethane accounts for all solids component is 50 to choose treated starch, aqueous polyurethane emulsion, this moment treated starch and aqueous polyurethane to account for treated starch and mass concentration be that the mass percent of 15% aqueous polyurethane emulsion is 30; Blend makes natural macromolecular composite aqueous polyurethane bond.
Embodiment 11:
A kind of preparation method of natural macromolecular composite aqueous polyurethane bond, it comprises the steps:
1). choose mass concentration and be 25% aqueous polyurethane emulsion (employing currently available products), standby;
2). it is 40% the substance A aqueous solution that substance A is made into mass concentration, and substance A is modified soy protein (an employing currently available products);
3). by mass concentration is that 40% the substance A aqueous solution and mass concentration are that the mass percent that substance A accounts for all solids component in 25% the aqueous polyurethane emulsion is 80, the mass percent that aqueous polyurethane accounts for all solids component is 20 to choose the substance A aqueous solution, aqueous polyurethane emulsion, this moment substance A and aqueous polyurethane to account for mass concentration be that 40% the substance A aqueous solution and mass concentration are that the mass percent of 25% aqueous polyurethane emulsion is 35.714; Blend makes natural macromolecular composite aqueous polyurethane bond.
Embodiment 12:
A kind of preparation method of natural macromolecular composite aqueous polyurethane bond, it comprises the steps:
1). choose mass concentration and be 20% aqueous polyurethane emulsion (employing currently available products), standby;
2). it is 40% the substance A aqueous solution that substance A is made into mass concentration, and substance A is starch (as legume starch) and soybean protein (as the soybean apolipoprotein), and the quality of starch and soybean protein respectively accounts for 50%;
3). by mass concentration is that 40% the substance A aqueous solution and mass concentration are that the mass percent that substance A accounts for all solids component in 20% the aqueous polyurethane emulsion is 80, the mass percent that aqueous polyurethane accounts for all solids component is 20 to choose the substance A aqueous solution, aqueous polyurethane emulsion, and to account for mass concentration be that 40% the substance A aqueous solution and mass concentration are that the mass percent of 20% aqueous polyurethane emulsion is 33.33 for substance A and aqueous polyurethane simultaneously; Blend makes natural macromolecular composite aqueous polyurethane bond.
Embodiment 13:
A kind of preparation method of natural macromolecular composite aqueous polyurethane bond, it comprises the steps:
1). choose mass concentration and be 20% aqueous polyurethane emulsion (employing currently available products), standby;
2). it is 50% the substance A aqueous solution that substance A is made into mass concentration, and substance A is soybean protein (as soybean protein isolate) and treated starch (adopting currently available products, as modified corn starch), and the quality of soybean protein and treated starch respectively accounts for 50%;
3). by mass concentration is that 50% the substance A aqueous solution and mass concentration are that the mass percent that substance A accounts for all solids component in 20% the aqueous polyurethane emulsion is 60, the mass percent that aqueous polyurethane accounts for all solids component is 40 to choose the substance A aqueous solution, aqueous polyurethane emulsion, and to account for mass concentration be that 50% the substance A aqueous solution and mass concentration are that the mass percent of 20% aqueous polyurethane emulsion is 31.25 for substance A and aqueous polyurethane simultaneously; Blend makes natural macromolecular composite aqueous polyurethane bond.
Embodiment 14:
Substantially the same manner as Example 13, difference is: substance A is treated starch and modified soy protein (employing currently available products), and the quality of treated starch and modified soy protein respectively accounts for 50%.
Embodiment 15:
Substantially the same manner as Example 13, difference is: substance A is starch and treated starch (employing currently available products), and the quality of starch and treated starch respectively accounts for 50%.
Embodiment 16:
Substantially the same manner as Example 13, difference is: substance A is soybean protein and modified soy protein (employing currently available products), and the quality of soybean protein and modified soy protein respectively accounts for 50%.
Embodiment 17:
Substantially the same manner as Example 13, difference is: substance A is starch, soybean protein and treated starch, and the shared mass percent of each component is in starch, soybean protein and the treated starch: starch 20, soybean protein 50, treated starch 30.
Embodiment 18:
Substantially the same manner as Example 13, difference is: substance A is starch, soybean protein, treated starch and modified soy protein, and the shared mass percent of each component is in starch, soybean protein, treated starch and the modified soy protein: starch 20, soybean protein 20, treated starch 30, modified soy protein 30.
Claims (2)
1. natural macromolecular composite aqueous polyurethane bond is characterized in that it is that the substance A aqueous solution of 40-100% and aqueous polyurethane emulsion blend that mass concentration is 10-25% make by mass concentration; Mass concentration is in the blend of the substance A aqueous solution of 40-100% and the aqueous polyurethane emulsion that mass concentration is 10-25%, the mass percent that substance A accounts for all solids component is 20-80, and the mass percent that aqueous polyurethane accounts for all solids component is 20-80; Simultaneously to account for the mass percent of the aqueous polyurethane emulsion blend total mass that the substance A aqueous solution that mass concentration is 40-100% and mass concentration be 10-25% be 30-40 for substance A and aqueous polyurethane; Wherein, substance A is any one or any one the above mixing in starch, soybean protein, treated starch, the modified soy protein, is any proportioning during any one above mixing;
The preparation of described aqueous polyurethane emulsion: by polyisocyanates and polyether glycol, perhaps polyisocyanates and polyester polyol, or polyisocyanates and polyethers and polyester polyol were reaction in 50-90 ℃ of stirring reaction 1-5 hour, wherein, a, the mass percent of polyisocyanates and polyether glycol is: polyisocyanates 65-90, polyether glycol 10-35, b, the mass percent of polyisocyanates and polyester polyol is: polyisocyanates 65-90, polyester polyol 10-35, c, the mass percent of polyisocyanates and polyethers and polyester polyol is: polyisocyanates 65-90, polyethers and polyester polyol 10-35, polyethers and polyester polyol with any than mixing; Carry out chain extension and crosslinked with the multiple functional radical small molecules that contains the carboxylated hydrophilic group again, wherein, the multiple functional radical small molecules is any one or any one the above mixing in dibasic alcohol, diamine, trivalent alcohol, the tertiary amine, is any proportioning during any one above mixing; The micromolecular add-on of multiple functional radical that contains the carboxylated hydrophilic group is the 10-50% of polyisocyanates; Its last NCO/OH mol ratio is 1.0-3.5, in the chainextender in [OH] and the polyvalent alcohol [OH] mol ratio be 1.0-3.5; Add neutralization reagent then, the adjusting pH value is 6.5-7.5, in and water-dispersion on the rocks again below the 5-10 minute postcooling to 40 ℃, aqueous polyurethane emulsion, the mass percent of solid content is 10-25%.
2. the preparation method of a kind of natural macromolecular composite aqueous polyurethane bond as claimed in claim 1 is characterized in that it comprises the steps:
1). the preparation of described aqueous polyurethane emulsion: by polyisocyanates and polyether glycol, perhaps polyisocyanates and polyester polyol, or polyisocyanates and polyethers and polyester polyol were reaction in 50-90 ℃ of stirring reaction 1-5 hour, wherein, a, the mass percent of polyisocyanates and polyether glycol is: polyisocyanates 65-90, polyether glycol 10-35, b, the mass percent of polyisocyanates and polyester polyol is: polyisocyanates 65-90, polyester polyol 10-35, c, the mass percent of polyisocyanates and polyethers and polyester polyol is: polyisocyanates 65-90, polyethers and polyester polyol 10-35, polyethers and polyester polyol with any than mixing; Carry out chain extension and crosslinked with the multiple functional radical small molecules that contains the carboxylated hydrophilic group again, wherein, the multiple functional radical small molecules is any one or any one the above mixing in dibasic alcohol, diamine, trivalent alcohol, the tertiary amine, is any proportioning during any one above mixing; The micromolecular add-on of multiple functional radical that contains the carboxylated hydrophilic group is the 10-50% of polyisocyanates; Its last NCO/OH mol ratio is 1.0-3.5, in the chainextender in [OH] and the polyvalent alcohol [OH] mol ratio be 1.0-3.5; Add neutralization reagent then, the adjusting pH value is 6.5-7.5, in and water-dispersion on the rocks again below the 5-10 minute postcooling to 40 ℃, aqueous polyurethane emulsion, the mass percent of solid content is 10-25%, and is standby;
2). substance A is made into the substance A aqueous solution that mass concentration is 40-100%, and substance A is any one or any one the above mixing in starch, soybean protein, treated starch, the modified soy protein, is any proportioning during any one above mixing;
3). in mass concentration is that the substance A aqueous solution and the mass concentration of 40-100% is in the aqueous polyurethane emulsion of 10-25%, the mass percent that accounts for all solids component by substance A is 20-80, the mass percent that aqueous polyurethane accounts for all solids component is that 20-80 chooses the substance A aqueous solution, aqueous polyurethane emulsion, and simultaneously to account for the mass percent of the aqueous polyurethane emulsion blend total mass that the substance A aqueous solution that mass concentration is 40-100% and mass concentration be 10-25% be 30-40 for substance A and aqueous polyurethane; Blend makes natural macromolecular composite aqueous polyurethane bond.
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2006
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