CN115160533A - Preparation method of waterborne polyurethane surface treating agent - Google Patents
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/6692—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/34
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/2805—Compounds having only one group containing active hydrogen
- C08G18/2815—Monohydroxy compounds
- C08G18/282—Alkanols, cycloalkanols or arylalkanols including terpenealcohols
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3225—Polyamines
- C08G18/3228—Polyamines acyclic
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- C—CHEMISTRY; METALLURGY
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/34—Carboxylic acids; Esters thereof with monohydroxyl compounds
- C08G18/348—Hydroxycarboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
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- C08G18/4854—Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
- C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
- C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
- C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
Abstract
The invention relates to a preparation method of a water-based polyurethane surface treating agent, which comprises the following steps: (1) Mixing polytetrahydrofuran ether, isophorone diisocyanate and a catalyst for reaction; (2) Cooling after reaction, and adding dimethylolpropionic acid and n-butyl alcohol in sequence for reaction; (3) adding triethylamine for neutralization after reaction; (4) Adding deionized water for emulsification after neutralization, and then adding ethylenediamine for secondary chain extension to obtain a waterborne polyurethane emulsion; (5) Adding deionized water, a wetting agent, a flatting agent and a dispersing agent to obtain a waterborne polyurethane surface treating agent; the molar ratio of NCO/OH in isophorone diisocyanate and polytetrahydrofuran ether is 2.0-2.8, the molar ratio of dimethylolpropionic acid to polytetrahydrofuran ether is 0.6-0.8, and the molar ratio of n-butyl alcohol to polytetrahydrofuran ether is 0.1-0.15. The waterborne polyurethane surface treating agent prepared by the preparation method has the advantages of weather resistance, yellowing resistance, wear resistance, water resistance, low temperature resistance, good film forming property and good stability.
Description
Technical Field
The invention belongs to the technical field of polyurethane surface treating agents, and particularly relates to a preparation method of a water-based polyurethane surface treating agent.
Background
The surface treatment agent generally refers to a material capable of forming a film on a surface by wiping, brushing, spraying or showering, and has the functions of improving the appearance, durability, correcting surface defects and increasing the variety of colors, and can form an anti-oil and anti-friction film on the surface. For example: leather, furniture, textile fabrics (transfer printing), wear-resistant coatings on plastic surfaces, plastic vacuum aluminized film priming materials, screen coating fabrics, antistatic materials for the electronic industry and the like.
Commonly used surface treating agents are acrylic resin based surface treating agents and polyurethane based surface treating agents. The acrylic resin surface treating agent belongs to thermoplastic materials, is sensitive to temperature, can soften and stick a coating along with the rise of the temperature, can be easily cracked when the temperature is reduced to a certain limit, has the phenomena of hot sticking and cold brittleness and poor weather resistance, and is easy to swell, dissolve and even fall off when a film formed by acrylic resin meets an organic solvent. The polyurethane surface treatment agent is divided into a solvent type surface treatment agent and a water-based surface treatment agent, the solvent type polyurethane surface treatment agent is toxic and easy to burn, the production process can pollute the environment, and the polyurethane surface treatment agent is gradually eliminated by the market along with the improvement of environmental regulations and the enhancement of environmental awareness of people. The waterborne polyurethane is a binary colloid system with water as a dispersion medium, and when the waterborne polyurethane is used for surface treatment, compared with an acrylic resin surface treatment agent, the waterborne polyurethane has the advantages of good leveling property, good film forming property, firm bonding and the like, and has a bright and plump surface, good wear resistance, good elasticity, low temperature resistance and folding resistance. The waterborne polyurethane surface treating agent takes water as a solvent, eliminates the risks of flammability, explosiveness and the like of the solvent type polyurethane surface treating agent in the processes of production, storage and transportation, and is more healthy and environment-friendly.
However, most of domestic waterborne polyurethane surface treating agents are synthesized by the reaction of polyether and TDI, and have the defects of poor weather resistance and easy yellowing of products.
Disclosure of Invention
The invention aims to provide a preparation method of a water-based polyurethane surface treating agent, and the prepared water-based polyurethane surface treating agent has the advantages of weather resistance, yellowing resistance, wear resistance, water resistance, low temperature resistance, good film forming property and good stability.
The technical scheme adopted by the invention for solving the problems is as follows: a preparation method of a water-based polyurethane surface treating agent comprises the following steps:
(1) Mixing bio-polytetrahydrofuran ether, isophorone diisocyanate and a catalyst and then reacting;
(2) Cooling after the reaction in the step (1), adding a chain extender dimethylolpropionic acid for reaction, and adding an end-capping reagent n-butyl alcohol for secondary reaction;
(3) After the reaction in the step (2) is finished, adding a neutralizing agent triethylamine for neutralization;
(4) After neutralization, adding deionized water for emulsification, stirring and dispersing, and then adding ethylenediamine for secondary chain extension to obtain a waterborne polyurethane emulsion;
(5) Adding deionized water, a wetting agent, a flatting agent and a dispersing agent, and dispersing uniformly to obtain the waterborne polyurethane surface treating agent.
Wherein the molar ratio of NCO/OH in isophorone diisocyanate and bio-based polytetrahydrofuran ether is 2.0-2.8: 1, the molar ratio of the dimethylolpropionic acid to the bio-based polytetrahydrofuran ether is 0.6 to 0.8, and the molar ratio of the n-butyl alcohol to the bio-based polytetrahydrofuran ether is 0.1 to 0.15.
Preferably, the reaction temperature in the step (1) is 75-85 ℃, and the reaction time is 90-120min.
Preferably, the catalyst in the step (1) is dibutyltin dilaurate, and the addition amount of the dibutyltin dilaurate is 0.5% of the sum of the masses of the bio-based polytetrahydrofuran ether and the isophorone diisocyanate.
Preferably, the temperature is reduced to 60 ℃ after the reaction in the step (2) is finished.
Preferably, in the step (2), the reaction time is 15min after the chain extender DMPA is added, and 10min after the end-capping reagent n-butanol is added.
Preferably, the adding amount of the deionized water in the step (5) is 15-30% of the mass of the emulsion in the step (4), the adding amount of the wetting agent is 0.5-2% of the mass of the emulsion in the step (4), the adding amount of the leveling agent is 0.2-1% of the mass of the emulsion in the step (4), and the adding amount of the dispersing agent is 0.2-1% of the mass of the emulsion in the step (4).
Compared with the prior art, the invention has the advantages that:
(1) According to the invention, bio-based polytetrahydrofuran ether and isophorone diisocyanate are taken as raw materials, a hydrophilic chain extender, namely dimethylolpropane, is introduced in a prepolymerization reaction, triethylamine is taken as a neutralizing agent, n-butanol is taken as a blocking agent, and an internal emulsification method is adopted to synthesize the anionic waterborne polyurethane surface treating agent.
(2) The molar ratio of NCO/OH in isophorone diisocyanate and bio-based polytetrahydrofuran ether is 2.0-2.8, the defects that when the molar ratio of NCO/OH is too large, the content of hard segments in a polyurethane structure is increased, a film is harder, the stretching degree is high, the water resistance is high, but the elongation at break is reduced, the elasticity is poor and the folding resistance is poor are avoided, and the defects that when the molar ratio of NCO/OH is too small, the surface of the emulsion is sticky and the strength is low after the film is formed are also avoided.
(3) The invention adopts an internal emulsification method to synthesize the anionic waterborne polyurethane surface treating agent, introduces dimethylolpropionic acid DMPA as a hydrophilic group in the molecular structure of polyurethane, ensures that the molecule has certain hydrophilicity, does not add an emulsifier, and is emulsified by the hydrophilic group contained in the molecule; and the molar ratio of the dimethylolpropionic acid to the bio-based polytetrahydrofuran ether is limited to be 0.6 to 0.8, so that the stability and the film forming property are excellent.
(4) The emulsion obtained by directly emulsifying the prepolymer after chain extension by dimethylolpropionic acid DMPA has larger molecular weight, and the viscosity is increased quickly in the storage process, thereby influencing the film-forming property and the leveling property of the emulsion. If a small amount of the end capping agent is used, the molecular weight and viscosity of the emulsion can be effectively controlled, and the film forming property and the leveling property of the emulsion are improved, so that the storage stability period of the emulsion is prolonged. The invention uses n-butyl alcohol as an end-capping reagent, but the more the n-butyl alcohol is used, the smaller the molecular weight of the emulsion is, the smaller the viscosity is, the tensile strength and the hardness are sharply reduced, the strength of a film-forming substance of the emulsion is very poor, and the surface is sticky.
Drawings
FIG. 1 is a process flow diagram of the preparation method of the waterborne polyurethane surface treating agent of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Example 1
The first step is as follows: adding isophorone diisocyanate (IPDI) and bio-based polytetrahydrofuran ether (PTMG) (the molar ratio of NCO/OH is 2:1), adding dibutyltin dilaurate (the adding amount of which is 0.5 percent of the sum of the masses of the isophorone diisocyanate (IPDI) and the bio-based polytetrahydrofuran ether (PTMG)), and installing a reflux condenser, a strong mechanical stirrer and a thermometer on a flask.
The second step is that: opening the reflux condenser pipe to reflux water, opening the water bath device, adjusting the water bath temperature to 80 ℃, starting timing when the water bath temperature reaches 80 ℃, and controlling the reaction time to be 90min.
The third step: and (2) after the reaction is finished, removing the water bath, naturally cooling, adding a chain extender DMPA (the molar ratio of DMPA/PTMG is 0.6.
The fourth step: adding deionized water (50% of the material liquid obtained after neutralization) under the action of high-speed stirring and shearing for emulsification and dispersion, adding ethylenediamine (5% of the material liquid obtained after neutralization) for secondary chain extension, and finally obtaining the waterborne polyurethane emulsion.
The fifth step: adding deionized water (20% of the mass of the aqueous polyurethane emulsion), wetting agent polyether modified silicone oil (1% of the mass of the aqueous polyurethane emulsion), flatting agent polyether siloxane copolymer (0.5% of the mass of the aqueous polyurethane emulsion), and dispersing agent non-reactive ethylene glycol copolymerization surfactant (0.5% of the mass of the aqueous polyurethane emulsion), and uniformly dispersing to obtain the aqueous polyurethane surface treating agent.
Example 2
The first step is as follows: to a dry four-necked flask, isophorone diisocyanate (IPDI) and bio-based polytetrahydrofuran ether (PTMG/OH molar ratio of 2.4: 1) were added, and dibutyl tin dilaurate (added in an amount of 0.5% by mass of the sum of isophorone diisocyanate (IPDI) and bio-based polytetrahydrofuran ether (PTMG)) was added, and the flask was equipped with a reflux condenser, a strong mechanical stirrer, and a thermometer.
The second step: and opening a reflux condenser pipe to reflux water, opening a water bath device, adjusting the water bath temperature to 80 ℃, starting timing when the water bath temperature reaches 80 ℃, and setting the reaction time to be 90min.
The third step: and (2) after the reaction is finished, removing the water bath, naturally cooling, adding a chain extender DMPA (the molar ratio of DMPA/PTMG is 0.6.
The fourth step: the fourth step: adding deionized water (50% of the mass of the feed liquid obtained after neutralization) under the action of high-speed stirring and shearing for emulsifying and dispersing, and adding ethylenediamine (50% of the mass of the feed liquid obtained after neutralization) for secondary chain extension to finally obtain the waterborne polyurethane emulsion.
The fifth step: adding deionized water (20% of the mass of the aqueous polyurethane emulsion), wetting agent polyether modified silicone oil (1% of the mass of the aqueous polyurethane emulsion), flatting agent polyether siloxane copolymer (0.5% of the mass of the aqueous polyurethane emulsion), and dispersing agent non-reactive ethylene glycol copolymerization surfactant (0.5% of the mass of the aqueous polyurethane emulsion), and uniformly dispersing to obtain the aqueous polyurethane surface treating agent.
Example 3
The first step is as follows: to a dry four-necked flask, isophorone diisocyanate (IPDI) and bio-based polytetrahydrofuran ether (PTMG/OH molar ratio of 2.8: 1) were added, and dibutyl tin dilaurate (added in an amount of 0.5% by mass of the sum of isophorone diisocyanate (IPDI) and bio-based polytetrahydrofuran ether (PTMG)) was added, and the flask was equipped with a reflux condenser, a strong mechanical stirrer, and a thermometer.
The second step is that: and opening a reflux condenser pipe to reflux water, opening a water bath device, adjusting the water bath temperature to 80 ℃, starting timing when the water bath temperature reaches 80 ℃, and setting the reaction time to be 90min.
The third step: and (2) after the reaction is finished, removing the water bath, naturally cooling, adding a chain extender DMPA (the molar ratio of DMPA/PTMG is 0.6.
The fourth step: the fourth step: adding deionized water (50% of the material liquid obtained after neutralization) under the action of high-speed stirring and shearing for emulsification and dispersion, adding ethylenediamine (5% of the material liquid obtained after neutralization) for secondary chain extension, and finally obtaining the waterborne polyurethane emulsion.
The fifth step: adding deionized water (20% of the mass of the aqueous polyurethane emulsion), wetting agent polyether modified silicone oil (1% of the mass of the aqueous polyurethane emulsion), flatting agent polyether siloxane copolymer (0.5% of the mass of the aqueous polyurethane emulsion), and dispersing agent non-reactive ethylene glycol copolymerization surfactant (0.5% of the mass of the aqueous polyurethane emulsion), and uniformly dispersing to obtain the aqueous polyurethane surface treating agent.
Comparative example 1
The only difference from example 1 is: NCO/OH molar ratio 1:1
Comparative example 2
The only difference from example 1 is: NCO/OH molar ratio 3:1
Comparative example 3
The only difference from example 1 is: the molar ratio of dimethylolpropionic acid to biobased polytetrahydrofuran ether was 0.5.
Comparative example 4
The only difference from example 1 is: buOH/PTMG molar ratio was 0.3:1.
the examples 1-3 and the comparative examples 1-4 were subjected to performance tests, and the specific results are shown in tables 1-3:
TABLE 1 results of performance test of examples 1-3 and comparative examples 1-2
| Molar ratio NCO/OH | Tensile strength/MPa | Elongation at break% | hardness/Shore A | Water absorption% |
| Example 1 (2:1) | 45.5 | 570 | 63 | 8.5 |
| Example 2 (2.4 | 61.2 | 530 | 71 | 5.9 |
| Example 3 (2.8 | 73.5 | 482 | 78 | 5.3 |
| COMPARATIVE EXAMPLE 1 (1:1) | 21.8 | 665 | 60 | 14.5 |
| Comparative example 2 (3:1) | 78.2 | 450 | 92 | 5.0 |
As can be seen from the above table, when the NCO/OH molar ratio is too large, the hard segment content in the polyurethane structure increases, the harder the film, the higher the elongation at break and the water resistance, but the elongation at break decreases, the elasticity becomes poor, and the folding resistance becomes poor.
Table 2 results of performance test of example 1 and comparative example 3
| Molar ratio DMPA/PTMC | Emulsion particle size/nm | Tensile strength/MPa | Elongation at break/% | hardness/Shore A | Water absorption/%) |
| Example 1 (0.6 | 14.9 | 45.5 | 570 | 63 | 8.5 |
| Comparative example 3 (0.5 | 25.5 | 43.2 | 525 | 70 | 7.5 |
As can be seen from the above table, dimethylolpropionic acid DMPA is introduced into the molecular structure of polyurethane as a hydrophilic group, so that the surface treating agent has certain hydrophilicity in molecules, the more the content of the hydrophilic group is, the smaller the particle size of the emulsion is, the better the toughness is, the greater the water absorption of the adhesive film is, the smaller the hardness is, and the excellent stability and film forming property of the polyurethane surface treating agent are.
Table 3 results of performance test of example 1 and comparative example 4
| Molar ratio BuOH/PTMC | Viscosity of the emulsion/mPa.s | Tensile strength/MPa | Elongation at break/% | hardness/Shore A |
| Example 1 (0.1 | 25 | 45.5 | 570 | 63 |
| Comparative example 4 (0.3 | 14 | 25 | 520 | 35 |
From the table above, it can be seen that, the small amount of n-butanol end-capping agent can effectively control the molecular weight and viscosity of the emulsion and improve the film forming property and leveling property of the emulsion, thereby increasing the storage stability period of the emulsion, but the more n-butanol, the smaller the molecular weight of the emulsion, the smaller the viscosity, the sharp decrease of the tensile strength and hardness, and the poor strength of the emulsion film forming material.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (6)
1. A preparation method of a waterborne polyurethane surface treating agent is characterized by comprising the following steps: the method comprises the following steps:
(1) Mixing bio-polytetrahydrofuran ether, isophorone diisocyanate and a catalyst and then reacting;
(2) Cooling after the reaction in the step (1), adding a chain extender dimethylolpropionic acid for reaction, and adding an end-capping reagent n-butyl alcohol for secondary reaction;
(3) After the reaction in the step (2) is finished, adding a neutralizing agent triethylamine for neutralization;
(4) After neutralization, adding deionized water for emulsification, stirring and dispersing, and then adding ethylenediamine for secondary chain extension to obtain a waterborne polyurethane emulsion;
(5) Adding deionized water, a wetting agent, a flatting agent and a dispersing agent, and uniformly dispersing to obtain the waterborne polyurethane surface treating agent;
wherein the molar ratio of NCO/OH in isophorone diisocyanate to bio-based polytetrahydrofuran ether is 2.0-2.8, the molar ratio of dimethylolpropionic acid to bio-based polytetrahydrofuran ether is 0.6-0.8.
2. The method of preparing the aqueous polyurethane surface treatment agent according to claim 1, wherein: in the step (1), the reaction temperature is 75-85 ℃, and the reaction time is 90-120min.
3. The method of preparing the aqueous polyurethane surface treating agent according to claim 1, wherein: in the step (1), the catalyst is dibutyltin dilaurate.
4. The method of preparing the aqueous polyurethane surface treating agent according to claim 1, wherein: and (3) cooling to 60 ℃ in the step (2).
5. The method of preparing the aqueous polyurethane surface treating agent according to claim 1, wherein: in the step (2), the reaction time is 15min after the chain extender DMPA is added, and 10min after the end-capping reagent n-butyl alcohol is added.
6. The method of preparing the aqueous polyurethane surface treatment agent according to claim 1, wherein: in the step (5), the addition amount of the deionized water is 15-30% of the mass of the aqueous polyurethane emulsion in the step (4), the addition amount of the wetting agent is 0.5-2% of the mass of the aqueous polyurethane emulsion in the step (4), the addition amount of the flatting agent is 0.2-1% of the mass of the aqueous polyurethane emulsion in the step (4), and the addition amount of the dispersing agent is 0.2-1% of the mass of the aqueous polyurethane emulsion in the step (4).
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| CN114316883A (en) * | 2022-01-07 | 2022-04-12 | 北京高盟新材料股份有限公司 | Bio-based modified water-based transfer cigarette adhesive and preparation method thereof |
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2022
- 2022-08-29 CN CN202211039291.6A patent/CN115160533A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1740206A (en) * | 2005-09-22 | 2006-03-01 | 上海市合成树脂研究所 | Prepn process of water thinned polyurethane emulsion |
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| CN110156948A (en) * | 2019-04-25 | 2019-08-23 | 陕西科技大学 | A kind of preparation method of the polysiloxane-modified aqueous polyurethane of amine-terminated hyperbrancedization |
| CN213841341U (en) * | 2020-12-22 | 2021-07-30 | 江苏向阳科技有限公司 | Water bath for preparing water-based coating agent for high-grade leather |
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