CN111269387A - Preparation method of waterborne polyurethane resin based on prepolymer method - Google Patents
Preparation method of waterborne polyurethane resin based on prepolymer method Download PDFInfo
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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
- C08G18/721—Two or more polyisocyanates not provided for in one single group C08G18/73 - C08G18/80
- C08G18/724—Combination of aromatic polyisocyanates with (cyclo)aliphatic polyisocyanates
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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
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
-
- 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
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
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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
- C08G18/65—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
- C08G18/6633—Compounds of group C08G18/42
- C08G18/6637—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/664—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
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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
- C08G18/65—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
- C08G18/6633—Compounds of group C08G18/42
- C08G18/6637—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6648—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3225 or C08G18/3271 and/or polyamines of C08G18/38
- C08G18/6651—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3225 or C08G18/3271 and/or polyamines of C08G18/38 with compounds of group C08G18/3225 or polyamines of C08G18/38
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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
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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
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7614—Polyisocyanates or polyisothiocyanates cyclic aromatic containing only one aromatic ring
Abstract
The invention discloses a preparation method of waterborne polyurethane resin based on a prepolymer method, which comprises the following steps: step S1: preparing a prepolymer: taking polyester polyol to react with isophorone diisocyanate and toluene diisocyanate to prepare a prepolymer with an isocyanate group as a terminal group; step S2: preparing a prepolymer: carrying out hydrophilic chain extension on isocyanate-based prepolymer and a chain extender to prepare high-viscosity prepolymer; step S3: neutralizing: and (3) carrying out neutralization reaction on the prepolymer and dimethylethanolamine to obtain a neutralization solution: step S4: high-speed dispersion: and adding the neutralization solution into water and an emulsifier under the action of high-speed stirring to prepare the stable waterborne polyurethane. The waterborne polyurethane resin designed and prepared by the invention has the characteristics of good yellowing resistance, high temperature resistance, low temperature resistance, wear resistance, low temperature flexing resistance and high solid content, can greatly replace the application of oleoresin, and promotes the markets of civil markets, sofas, decorations and home decoration.
Description
Technical Field
The invention relates to the technical field of polymer material synthesis, in particular to a preparation method of an aqueous polyurethane resin based on a prepolymer method.
Background
China is a world large country for producing synthetic leather, more than 2000 related enterprises are shared, more than 1300 production lines exist, the annual production capacity reaches 35 hundred million square meters, and the capacity and the yield respectively account for 67 percent and 51 percent of the world. Zhejiang province is always in the leading position in the huge synthetic leather industry of China, the yield of Zhejiang province is the first in China, production enterprises account for 60% of China, and production lines account for 61.5%. The Zhejiang synthesis-based industry has entered a rapid development period, the production scale thereof is continuously enlarged, the product quality is steadily improved, the variety of the sesame is gradually enriched, and the demand of domestic and foreign medium-low grade synthetic leather products can be basically satisfied. But the Chinese synthetic leather industry has a plurality of problems. On one hand, compared with similar products of advanced countries abroad, synthetic leather products in China are single in variety, low in technical content, poor in product performance and lack of international competitiveness, high-grade varieties also depend on imports in a large amount, and export amount is far smaller than import amount; on the other hand, the synthetic leather industry in China has relatively surplus capacity and fierce market competition, more than half of low production capacity is idle in China at present, the direct result is harsh price war, and many enterprises are in a state of reluctant main appearance. The three important reasons that domestic synthetic leather products sink into a puddle with a vicious price competition are that the products are too identical or the technical content of the products is low, so that the products are easy to counterfeit. On one hand, different post-treatment processes are fully utilized, the product types are increased, and the differential production of the products is realized as much as possible; on the other hand, to enhance technical innovation, special attention needs to be paid to the application of novel functional auxiliary agents, novel raw materials and novel production processes in the synthetic leather industry, and high-performance multifunctional synthetic leather suitable for the market W needs to be developed. Therefore, a preparation method of the waterborne polyurethane resin based on a prepolymer method is provided for solving the problems.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a preparation method of an aqueous polyurethane resin based on a prepolymer method.
The invention provides a preparation method of waterborne polyurethane resin based on a prepolymer method, which comprises the following steps:
step S1: preparing a prepolymer:
taking polyester polyol to react with isophorone diisocyanate (IPDI) and Toluene Diisocyanate (TDI), and preparing a prepolymer with an end group of isocyanate group (-NCO) for later use;
step S2: preparing a prepolymer:
carrying out hydrophilic chain extension on the isocyanate group (-NCO) prepolymer in the step S1 and a chain extender to prepare a high-viscosity prepolymer;
step S3: neutralizing:
and (3) performing neutralization reaction on the prepolymer in the step S2 and dimethylethanolamine to obtain a neutralized liquid:
step S4: high-speed dispersion:
and (4) adding the neutralization solution in the step (S3) into water and an emulsifier under the action of high-speed stirring, and dispersing the neutralization solution into the water under the action of strong shearing force to prepare the stable waterborne polyurethane.
Preferably, in the step S1, the mass ratio of the polyester polyol to the isophorone diisocyanate (IPDI) to the Toluene Diisocyanate (TDI) is 25-35: 40-65: 30 to 78.
Preferably, in step S2, the chain extender is one of ethylenediamine, liquid MOCA, hydroquinone bis (β -hydroxyethyl) ether (HQEE).
Preferably, in the step S2, the mass ratio of the chain extender to the isocyanate group (-NCO) prepolymer is 2 to 3: 5 to 7.
Preferably, in the step S34, the mass ratio of the dimethylethanolamine to the prepolymer is 2-4: 8 to 11.
Preferably, in the step S4, the stirring rate of the neutralized liquid is 2800 to 4500 rpm.
Preferably, in the step S4, the emulsifier is one of gum arabic and sodium alkyl benzene sulfonate, and the mass ratio of the emulsifier to the neutralizing solution is 1-2: 6-8.
Preferably, in the step S4, the mass ratio of the emulsifier to the water is 1-2: 2 to 3.
The preparation method of the waterborne polyurethane resin based on the prepolymer method has the beneficial effects that: the invention adopts a prepolymer method to produce the waterborne polyurethane resin, firstly, polyester polyol reacts with isophorone diisocyanate (IPDI) and Toluene Diisocyanate (TDI) to prepare prepolymer with an end group of isocyanate (-NCO);
carrying out hydrophilic chain extension through the hydrophilic components (dimethylolpropionic acid and trimethylolpropane) and the chain extender in the prepolymer to obtain a high-viscosity prepolymer; and (2) neutralizing by using dimethylethanolamine, finally adding into water and an emulsifier under the action of high-speed stirring, and dispersing into water under the action of strong shearing force to prepare the stable waterborne polyurethane.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Example one
The general flow of the preparation process of the waterborne polyurethane resin based on the prepolymer method can be as follows: feeding → prepolymerization reaction → neutralization chain extension → dispersion → quality control → packaging;
the preparation method of the waterborne polyurethane resin based on the prepolymer method comprises the following steps:
step S1: preparing a prepolymer:
taking polyester polyol to react with isophorone diisocyanate (IPDI) and Toluene Diisocyanate (TDI), and preparing a prepolymer with an end group of isocyanate group (-NCO) for later use;
step S2: preparing a prepolymer:
carrying out hydrophilic chain extension on the isocyanate group (-NCO) prepolymer in the step S1 and a chain extender to prepare a high-viscosity prepolymer;
step S3: neutralizing:
and (3) performing neutralization reaction on the prepolymer in the step S2 and dimethylethanolamine to obtain a neutralized liquid:
step S4: high-speed dispersion:
and (4) adding the neutralization solution obtained in the step (S3) into water and an emulsifier under the action of high-speed stirring, and dispersing the neutralization solution into the water under the action of strong shearing force to prepare the stable waterborne polyurethane.
In this embodiment, in step S1, the mass ratio of the polyester polyol, isophorone diisocyanate (IPDI), and Toluene Diisocyanate (TDI) is 25: 65: 78.
in this embodiment, in step S2, the chain extender is one of ethylenediamine, liquid MOCA, and hydroquinone bis (β -hydroxyethyl) ether (HQEE).
In this example, in step S2, the mass ratio of the chain extender to the isocyanate group (-NCO) prepolymer is 2: 7.
in this embodiment, in step S34, the mass ratio of dimethylethanolamine to prepolymer is 2: 11.
in this example, in step S4, the stirring rate of the neutralization solution was 2800 rpm.
In this embodiment, in step S4, the emulsifier is one of gum arabic and sodium alkyl benzene sulfonate, and the mass ratio of the emulsifier to the neutralizing solution is 1: 8.
in this embodiment, in step S4, the mass ratio of the emulsifier to the water is 1: 3.
example two
The preparation method of the waterborne polyurethane resin based on the prepolymer method comprises the following steps:
step S1: preparing a prepolymer:
taking polyester polyol to react with isophorone diisocyanate (IPDI) and Toluene Diisocyanate (TDI), and preparing a prepolymer with an end group of isocyanate group (-NCO) for later use;
step S2: preparing a prepolymer:
carrying out hydrophilic chain extension on the isocyanate group (-NCO) prepolymer in the step S1 and a chain extender to prepare a high-viscosity prepolymer;
step S3: neutralizing:
and (3) performing neutralization reaction on the prepolymer in the step S2 and dimethylethanolamine to obtain a neutralized liquid:
step S4: high-speed dispersion:
and (4) adding the neutralization solution obtained in the step (S3) into water and an emulsifier under the action of high-speed stirring, and dispersing the neutralization solution into the water under the action of strong shearing force to prepare the stable waterborne polyurethane.
In this embodiment, in step S1, the mass ratio of the polyester polyol, isophorone diisocyanate (IPDI), and Toluene Diisocyanate (TDI) is 35: 65: 30.
in this embodiment, in step S2, the chain extender is one of ethylenediamine, liquid MOCA, and hydroquinone bis (β -hydroxyethyl) ether (HQEE).
In this example, in step S2, the mass ratio of the chain extender to the isocyanate group (-NCO) prepolymer is 2: 5.
in this embodiment, in step S34, the mass ratio of dimethylethanolamine to prepolymer is 2: 8.
in this example, in step S4, the stirring rate of the neutralized liquid was 3000 rpm.
In this embodiment, in step S4, the emulsifier is one of gum arabic and sodium alkyl benzene sulfonate, and the mass ratio of the emulsifier to the neutralizing solution is 1: 6.
in this embodiment, in step S4, the mass ratio of the emulsifier to the water is 2: 3.
EXAMPLE III
The preparation method of the waterborne polyurethane resin based on the prepolymer method comprises the following steps:
step S1: preparing a prepolymer:
taking polyester polyol to react with isophorone diisocyanate (IPDI) and Toluene Diisocyanate (TDI), and preparing a prepolymer with an end group of isocyanate group (-NCO) for later use;
step S2: preparing a prepolymer:
carrying out hydrophilic chain extension on the isocyanate group (-NCO) prepolymer in the step S1 and a chain extender to prepare a high-viscosity prepolymer;
step S3: neutralizing:
and (3) performing neutralization reaction on the prepolymer in the step S2 and dimethylethanolamine to obtain a neutralized liquid:
step S4: high-speed dispersion:
and (4) adding the neutralization solution obtained in the step (S3) into water and an emulsifier under the action of high-speed stirring, and dispersing the neutralization solution into the water under the action of strong shearing force to prepare the stable waterborne polyurethane.
In this embodiment, in step S1, the mass ratio of the polyester polyol, isophorone diisocyanate (IPDI), and Toluene Diisocyanate (TDI) is 35: 40: 30.
in this embodiment, in step S2, the chain extender is one of ethylenediamine, liquid MOCA, and hydroquinone bis (β -hydroxyethyl) ether (HQEE).
In this example, in step S2, the mass ratio of the chain extender to the isocyanate group (-NCO) prepolymer is 2: 5.
in this embodiment, in step S34, the mass ratio of dimethylethanolamine to prepolymer is 2: 8;
in this example, in step S4, the stirring rate of the neutralized liquid was 3500 rpm.
In this embodiment, in step S4, the emulsifier is one of gum arabic and sodium alkyl benzene sulfonate, and the mass ratio of the emulsifier to the neutralizing solution is 2: 7.
in this embodiment, in step S4, the mass ratio of the emulsifier to the water is 1: 1.
example four
The preparation method of the waterborne polyurethane resin based on the prepolymer method comprises the following steps:
step S1: preparing a prepolymer:
taking polyester polyol to react with isophorone diisocyanate (IPDI) and Toluene Diisocyanate (TDI), and preparing a prepolymer with an end group of isocyanate group (-NCO) for later use;
step S2: preparing a prepolymer:
carrying out hydrophilic chain extension on the isocyanate group (-NCO) prepolymer in the step S1 and a chain extender to prepare a high-viscosity prepolymer;
step S3: neutralizing:
and (3) performing neutralization reaction on the prepolymer in the step S2 and dimethylethanolamine to obtain a neutralized liquid:
step S4: high-speed dispersion:
and (4) adding the neutralization solution obtained in the step (S3) into water and an emulsifier under the action of high-speed stirring, and dispersing the neutralization solution into the water under the action of strong shearing force to prepare the stable waterborne polyurethane.
In this embodiment, in step S1, the mass ratio of the polyester polyol, isophorone diisocyanate (IPDI), and Toluene Diisocyanate (TDI) is 30: 55: 62.
in this embodiment, in step S2, the chain extender is one of ethylenediamine, liquid MOCA, and hydroquinone bis (β -hydroxyethyl) ether (HQEE).
In this example, in step S2, the mass ratio of the chain extender to the isocyanate group (-NCO) prepolymer is 1: 2.
in this embodiment, in step S34, the mass ratio of dimethylethanolamine to prepolymer is 1: 3.
in this example, in step S4, the stirring rate of the neutralized liquid was 4000 rpm.
In this embodiment, in step S4, the emulsifier is one of gum arabic and sodium alkyl benzene sulfonate, and the mass ratio of the emulsifier to the neutralizing solution is 1: 3.
in this embodiment, in step S4, the mass ratio of the emulsifier to the water is 3: 5.
EXAMPLE five
The preparation method of the waterborne polyurethane resin based on the prepolymer method comprises the following steps:
step S1: preparing a prepolymer:
taking polyester polyol to react with isophorone diisocyanate (IPDI) and Toluene Diisocyanate (TDI), and preparing a prepolymer with an end group of isocyanate group (-NCO) for later use;
step S2: preparing a prepolymer:
carrying out hydrophilic chain extension on the isocyanate group (-NCO) prepolymer in the step S1 and a chain extender to prepare a high-viscosity prepolymer;
step S3: neutralizing:
and (3) performing neutralization reaction on the prepolymer in the step S2 and dimethylethanolamine to obtain a neutralized liquid:
step S4: high-speed dispersion:
and (4) adding the neutralization solution obtained in the step (S3) into water and an emulsifier under the action of high-speed stirring, and dispersing the neutralization solution into the water under the action of strong shearing force to prepare the stable waterborne polyurethane.
In this embodiment, in step S1, the mass ratio of the polyester polyol, isophorone diisocyanate (IPDI), and Toluene Diisocyanate (TDI) is 35: 65: 78.
in this embodiment, in step S2, the chain extender is one of ethylenediamine, liquid MOCA, and hydroquinone bis (β -hydroxyethyl) ether (HQEE).
In this example, in step S2, the mass ratio of the chain extender to the isocyanate group (-NCO) prepolymer is 3: 7.
in this embodiment, in step S34, the mass ratio of dimethylethanolamine to prepolymer is 9: 10.
in this example, in step S4, the stirring rate of the neutralized liquid was 4500 rpm.
In this embodiment, in step S4, the emulsifier is one of gum arabic and sodium alkyl benzene sulfonate, and the mass ratio of the emulsifier to the neutralizing solution is 2: 7.
in this embodiment, in step S4, the mass ratio of the emulsifier to the water is 1: 3.
the preparation method of the waterborne polyurethane resin based on the prepolymer method automatically controls key process parameters of the production system such as batching batch, quantity, reaction temperature, flow and the like through a computer, and achieves the operation of the whole production system in the optimal state.
The performance of the aqueous polyurethane resin prepared in the first to fifth examples was tested, and the experimental data are shown in the following table:
as can be seen from the above tables, the performances of the waterborne polyurethane resin designed and prepared by the invention are obviously improved, and the third embodiment is the best embodiment;
the waterborne polyurethane resin designed and prepared by the invention has the advantages that the yellowing resistance is more than 4 grades, the temperature resistance is-45-160 ℃, the wear resistance (Martindale) is high, the dry grinding is more than 6 ten thousand times, the wet grinding is more than 10 ten thousand times, and the low-temperature flexing resistance is more than-15 ℃/20 ten thousand times. The solid content can reach more than 60 percent, and the oil-based resin can greatly replace the application of the oil-based resin and the effect which cannot be achieved by the oil-based resin. The application of the environment-friendly water-based resin will be described as follows: the reoccurrence of the events of 'smelly Audi' and 'poisonous gallop' can also actively promote the market progress of civil market, sofa, decoration and home decoration.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A preparation method of waterborne polyurethane resin based on a prepolymer method is characterized by comprising the following steps:
step S1: preparing a prepolymer:
taking polyester polyol to react with isophorone diisocyanate (IPDI) and Toluene Diisocyanate (TDI), and preparing a prepolymer with an end group of isocyanate group (-NCO) for later use;
step S2: preparing a prepolymer:
carrying out hydrophilic chain extension on the isocyanate group (-NCO) prepolymer in the step S1 and a chain extender to prepare a high-viscosity prepolymer;
step S3: neutralizing:
and (3) performing neutralization reaction on the prepolymer in the step S2 and dimethylethanolamine to obtain a neutralized liquid:
step S4: high-speed dispersion:
and (4) adding the neutralization solution in the step (S3) into water and an emulsifier under the action of high-speed stirring, and dispersing the neutralization solution into the water under the action of strong shearing force to prepare the stable waterborne polyurethane.
2. The method for preparing the waterborne polyurethane resin based on the prepolymer method according to claim 1, wherein in the step S1, the mass ratio of the polyester polyol to the isophorone diisocyanate (IPDI) to the Toluene Diisocyanate (TDI) is 25-35: 40-65: 30 to 78.
3. The method of claim 1, wherein in step S2, the chain extender is one of ethylenediamine, liquid MOCA, hydroquinone bis (β -hydroxyethyl) ether (HQEE).
4. The preparation method of the waterborne polyurethane resin based on the prepolymer method as claimed in claim 1, wherein in step S2, the mass ratio of the chain extender to the isocyanate group (-NCO) prepolymer is 2-3: 5 to 7.
5. The preparation method of the waterborne polyurethane resin based on the prepolymer method according to claim 1, wherein in the step S34, the mass ratio of the dimethylethanolamine to the prepolymer is 2-4: 8 to 11.
6. The method for preparing an aqueous polyurethane resin according to claim 1, wherein the stirring rate of the neutralization solution in step S4 is 2800-4500 rpm.
7. The method for preparing the waterborne polyurethane resin based on the prepolymer method according to claim 1, wherein in the step S4, the emulsifier is one of Arabic gum and sodium alkyl benzene sulfonate, and the mass ratio of the emulsifier to the neutralizing solution is (1-2): 6-8.
8. The method for preparing the waterborne polyurethane resin based on the prepolymer method according to claim 1, wherein in the step S4, the mass ratio of the emulsifier to the water is 1-2: 2 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010242201.8A CN111269387B (en) | 2020-03-31 | 2020-03-31 | Preparation method of waterborne polyurethane resin based on prepolymer method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010242201.8A CN111269387B (en) | 2020-03-31 | 2020-03-31 | Preparation method of waterborne polyurethane resin based on prepolymer method |
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| CN111269387A true CN111269387A (en) | 2020-06-12 |
| CN111269387B CN111269387B (en) | 2022-03-25 |
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| CN112194817A (en) * | 2020-09-30 | 2021-01-08 | 振德医疗用品股份有限公司 | Production method of medical polyurethane foam |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112194817A (en) * | 2020-09-30 | 2021-01-08 | 振德医疗用品股份有限公司 | Production method of medical polyurethane foam |
| CN112194817B (en) * | 2020-09-30 | 2022-12-09 | 振德医疗用品股份有限公司 | Production method of medical polyurethane foam |
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