CN113279265A - Water-based high-solid foaming resin for synthetic leather and preparation method thereof - Google Patents
Water-based high-solid foaming resin for synthetic leather and preparation method thereof Download PDFInfo
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- CN113279265A CN113279265A CN202110170003.XA CN202110170003A CN113279265A CN 113279265 A CN113279265 A CN 113279265A CN 202110170003 A CN202110170003 A CN 202110170003A CN 113279265 A CN113279265 A CN 113279265A
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0043—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by their foraminous structure; Characteristics of the foamed layer or of cellular layers
- D06N3/005—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by their foraminous structure; Characteristics of the foamed layer or of cellular layers obtained by blowing or swelling agent
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
- D06N3/0059—Organic ingredients with special effects, e.g. oil- or water-repellent, antimicrobial, flame-resistant, magnetic, bactericidal, odour-influencing agents; perfumes
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
- D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
- D06N3/146—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes characterised by the macromolecular diols used
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
- D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
- D06N3/147—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes characterised by the isocyanates used
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2211/00—Specially adapted uses
- D06N2211/12—Decorative or sun protection articles
- D06N2211/28—Artificial leather
Abstract
The water-based high-solid foaming resin for the synthetic leather and the preparation method thereof comprise the following substances in parts by weight: 55-65% of water-based high-solid foaming polyurethane emulsion, 30-40% of water, 2-5% of foaming agent, 0.1-0.5% of wetting agent, 0.1-0.5% of flatting agent and 1-3% of water-based polyurethane thickener. The solid content of the aqueous polyurethane emulsion prepared by the invention is 60-70%, the aqueous polyurethane emulsion is stable, the formed film has higher tensile strength and elongation at break, the water resistance is good, the industrial production control is easy, and the emulsion can be used independently, and can also be added with an auxiliary agent to prepare foaming slurry for use; the foaming resin slurry prepared by the invention has the advantages of simple process, high drying speed and no solvent pollution in a production line, and improves the working environment of workers.
Description
Technical Field
The invention belongs to the field of leather spraying adhesives, and particularly relates to a water-based high-solid foaming resin for synthetic leather and a preparation method thereof.
Background
The prior synthetic leather manufacturing technology based on water-based resin still follows the traditional dry and wet processes of oily synthetic leather, the dry process has complicated procedures (three coating and four baking), expensive release paper is used as a carrier, and the cost is high; the wet process technology uses CaCl 2-containing solution as solidification liquid to generate a large amount of salt-containing wastewater (10 tons/km), so that the direct foam coating technology without release paper replaces the existing transfer coating technology using release paper as a carrier, and the technical bottlenecks of high cost (the release paper is higher than 50 yuan/m) and high energy consumption of the traditional technology can be broken through; meanwhile, the generation and the waste water discharge of a large amount of waste water containing organic solvent are reduced, and the process flow is shortened. The process of the direct foam coating of the water-based synthetic leather is shown in figure 1.
Compared with the existing water-based wet method, water-based dry method and solvent type synthetic leather, the direct foam coating process of the water-based synthetic leather has the advantages that: (1) the advantages of foam pores and air and moisture permeability are kept, but the calcium-containing salt aqueous solution is not used for solidification, the calcium-containing salt wastewater is not generated, and the three wastes are not generated and discharged in the whole production process; (2) a special foam coating technology is adopted, and the special foam coating technology is directly coated on the base cloth instead of the release paper, so that expensive release paper resources are saved; (3) solvents such as DMF are not used, and wastewater containing the solvents is not generated; and (4) directly coating a water-based polyurethane foaming layer on the base cloth, wherein water vapor can penetrate through the two sides of the base cloth, the drying speed is high, the vehicle speed can reach 15-20m/mim, the coating amount can reach 200-600g/m, and the thickness can reach 1.4 mm.
At present, most of the synthetic waterborne polyurethane with high solid content adopts a mode of introducing sulfonic groups, in general, ethylene diamine ethyl sodium sulfonate (AAS) or A-95 is used as a hydrophilic chain extender to prepare sulfonic waterborne polyurethane, in the introducing mode, the small molecular chain extender bears the hard segment structure of polyurethane resin, the hydrophilic groups of the prepared waterborne polyurethane resin are distributed unevenly, the prepared polyurethane resin has larger particles, and the stability and the mechanical property of the waterborne polyurethane resin cannot meet the application requirements. In addition, AAS or A-95 takes part in the reaction in the form of aqueous solution, a large amount of side reactions are increased due to the presence of water, and the reaction is violent and is not easy to control, so that the method is not suitable for industrial production.
Disclosure of Invention
The invention provides a water-based high-solid foaming resin for synthetic leather, which is used for overcoming the defects in the prior art.
The invention is realized by the following technical scheme:
the water-based high-solid foaming resin for the synthetic leather comprises the following substances in parts by weight:
55-65% of water-based high-solid foaming polyurethane emulsion, 30-40% of water, 2-5% of foaming agent, 0.1-0.5% of wetting agent, 0.1-0.5% of flatting agent and 1-3% of water-based polyurethane thickener.
The waterborne high-solid foaming resin for synthetic leather comprises the following substances in parts by weight:
60-70% of polyether polyol, 8-10% of sulfonic polyester polyol, 18-25% of diisocyanate, 0.01-0.05% of catalyst, 0.5-1.5% of micromolecule chain extender, 1.7-3.2% of hydrophilic chain extender, 1.1-2.2% of alkaline neutralizer and 0.2-0.3% of amine chain extender.
The water-based high-solid foaming resin for synthetic leather is characterized in that the molecular weight of the polyether polyol is 2000.
The water-based high-solid foaming resin for synthetic leather is a mixture of any one or more than two of polyethylene glycol, polypropylene glycol and polytetrahydrofuran glycol in any proportion.
The hydroxyl value of the polyethylene glycol is 58-63 mgKOH/g.
The hydroxyl value of the polypropylene glycol is 51-62mgKOH/g respectively.
The water-based high-solid foaming resin for synthetic leather has a hydroxyl value of 54-57 mgKOH/g.
The waterborne high-solid foaming resin for synthetic leather is characterized in that: the molecular weight of the sulfonic acid type polyester is 1000, and the hydroxyl value is 95-100 mgKOH/g.
The waterborne high-solid foaming resin for synthetic leather is a mixture of one or two of isophorone diisocyanate and hexamethylene diisocyanate in any proportion.
The catalyst is any one of dibutyl tin dilaurate or stannous octoate.
The above waterborne high-solid foaming resin for synthetic leather is a mixture of neopentyl glycol or trimethyl pentanediol, wherein the small molecular chain extender is any one or two of the neopentyl glycol and the trimethyl pentanediol which are mixed in any proportion.
The above waterborne high-solid foaming resin for synthetic leather is characterized in that the hydrophilic chain extender is dimethylolpropionic acid.
The aqueous high-solid foaming resin for synthetic leather is characterized in that the alkaline neutralizing agent is triethylamine.
The amine chain extender is any one of hydrazine hydrate, ethylenediamine and isophorone diamine.
The waterborne high-solid foaming resin for synthetic leather is characterized in that the foaming agent is a polystyrene foaming agent.
The wetting agent is the alkylphenol polyoxyethylene nonionic wetting agent.
The waterborne high-solid foaming resin for synthetic leather is characterized in that the leveling agent is an organic silicon leveling agent.
The waterborne high-solid foaming resin for synthetic leather is characterized in that the thickening agent is a waterborne polyurethane thickening agent.
A preparation method of water-based high-solid foaming resin for synthetic leather comprises the following steps:
the method comprises the following steps: weighing polyether polyol, sulfonic polyester polyol, diisocyanate, a catalyst, a micromolecular chain extender, a hydrophilic chain extender, an alkaline neutralizer and an amine chain extender according to a ratio;
step two: adding polyether polyol and sulfonic acid polyester polyol into a reactor, adding diisocyanate and a catalyst under the protection of nitrogen, and reacting at the temperature of 80-90 ℃ for 1-2 hours to obtain a prepolymer;
step three: cooling the temperature of the prepolymer obtained in the step three to 50-70 ℃, adding a micromolecule chain extender and a hydrophilic chain extender dihydroxy, and mixing and reacting for 2-3 hours to obtain a polyurethane prepolymer containing hydrophilic groups and carboxyl groups;
step four: introducing the polyurethane prepolymer containing hydrophilic groups and carboxyl groups obtained in the step three into an emulsifying kettle, adding a proper amount of alkaline neutralizing agent, adding deionized water with the volume of 75-85% of that of the polyurethane prepolymer containing hydrophilic groups and carboxyl groups at the temperature of 20-25 ℃ and the rotating speed of 800-1300r/min for emulsification for 3-5min, adding an amine chain extender, continuing stirring and dispersing for 10-30min after the addition of the amine chain extender is finished, and removing the organic solvent in vacuum to obtain the aqueous high-solid polyurethane emulsion;
step five: weighing the water-based high-solid foaming polyurethane emulsion, the foaming agent, the wetting agent, the leveling agent and the water-based polyurethane thickener according to the proportion;
step six: and (2) putting the water-based high-solid-content polyurethane emulsion into a reactor, adding a foaming agent, a wetting agent and a flatting agent under the stirring condition, stirring and dispersing uniformly, increasing the stirring rotating speed to 800-1300r/min, monitoring the foaming rate in real time, adding a water-based polyurethane thickener after the preset foaming rate is reached, and adjusting to the preset viscosity to obtain the water-based high-solid foaming resin.
The invention has the advantages that: the solid content of the aqueous polyurethane emulsion prepared by the invention is 60-70%, the aqueous polyurethane emulsion is stable, the formed film has higher tensile strength and elongation at break, the water resistance is good, the industrial production control is easy, and the emulsion can be used independently, and can also be added with an auxiliary agent to prepare foaming slurry for use; the foaming resin slurry prepared by the invention has the advantages of simple process, high drying speed and no solvent pollution in a production line, and improves the working environment of workers.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a prior art process for direct foam coating of waterborne synthetic leather.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Adding 240g of polytetrahydrofuran ether glycol and 33g of sulfonic acid type polyester polyol into a four-neck flask provided with a stirrer and a thermometer, heating to 110 ℃, vacuumizing for dehydration, wherein the vacuum degree is-0.08 MPa, cooling to below 75 ℃ after 1.5h, replacing a vacuum pipe orifice with a condensation reflux pipe, adding 81.00g of IPDI (isophorone diisocyanate), 3g of HDI (hexamethylene diisocyanate), and 0.06g of dibutyltin dilaurate, uniformly mixing, heating to 85-90 ℃, and reacting for 2 h; the temperature of the obtained prepolymer was lowered to 60 ℃, 5.00g of neopentyl glycol and 10.6g of dimethylolpropionic acid were added, and at the same time, acetone was added to control the viscosity of the reaction system, and chain extension reaction was carried out at 70 to 75 ℃ for 3 hours to obtain a prepolymer. And transferring the prepolymer into an emulsifying kettle, adding 7.20g of triethylamine, adding water under high-speed shearing for emulsification, adding 12.3g of hydrazine hydrate 10% aqueous solution at the water temperature of 20-25 ℃, uniformly dispersing, and removing acetone in vacuum to obtain the water-based high-solid polyurethane emulsion. The solid content of the obtained emulsion was 63%, the viscosity was 80mpa.s, the pH: 7.36.
example 2
Adding 250g of polyethylene glycol and 36g of sulfonic acid type polyester polyol into a four-neck flask provided with a stirrer and a thermometer, heating to 120 ℃, vacuumizing and dehydrating, wherein the vacuum degree shows-0.09 Mpa, cooling to below 75 ℃ after 1.5h, replacing a vacuum tube opening with a condensation reflux tube, adding 62.00g of IPDI and 13g of HDI, adding 0.09g of stannous octoate, uniformly mixing, heating to 85-90 ℃, and reacting for 2 h; the temperature of the obtained prepolymer was lowered to 60 ℃, 2.00g of neopentyl glycol, 1.50g of trimethylpentanediol and 9.9g of dimethylolpropionic acid were added, and at the same time, acetone was added to control the viscosity of the reaction system, and chain extension reaction was carried out at 70-75 ℃ for 3 hours to obtain a prepolymer. Transferring the prepolymer into an emulsifying kettle, adding 6.70g of triethylamine, adding water under high-speed shearing for emulsification, adding 11.30g of hydrazine hydrate 10% aqueous solution to disperse uniformly, and removing acetone in vacuum to obtain the water-based high-solid polyurethane emulsion. The resulting emulsion had a solids content of 66%, a viscosity of 120mpa.s, a pH: 7.22.
the preparation method of the foaming resin comprises the steps of adding 2% of foaming agent, 0.1% of wetting agent and 0.3% of flatting agent into the high-solid-content aqueous polyurethane emulsion in the stirring process, uniformly dispersing the auxiliary agent at a low speed, increasing the stirring speed to 800-1300r/min, and adding about 1.2% of aqueous polyurethane thickener after reaching a proper foaming ratio until reaching a proper viscosity.
Example 3
Adding 190g of polypropylene glycol and 28g of sulfonic acid type polyester polyol into a four-neck flask provided with a stirrer and a thermometer, heating to 120 ℃, vacuumizing for dehydration, wherein the vacuum degree is-0.08 MPa, cooling to below 75 ℃ after 1.5h, replacing a vacuum pipe orifice with a condensation reflux pipe, adding 57.00g of IPDI (isophorone diisocyanate), adding 0.15g of stannous octoate, uniformly mixing, heating to 85-90 ℃, and reacting for 1.5 h; the temperature of the obtained prepolymer was lowered to 60 ℃, 3.00g of neopentyl glycol and 6.00g of dimethylolpropionic acid were added, and at the same time, acetone was added to control the viscosity of the reaction system, and chain extension reaction was carried out at 70 to 75 ℃ for 2.5 hours to obtain a prepolymer. And transferring the prepolymer into an emulsifying kettle, adding 4.52g of triethylamine, adding water under high-speed shearing for emulsification, adding 25.6g of an isophorone diamine 10% aqueous solution, uniformly dispersing, and removing acetone in vacuum to obtain the water-based high-solid polyurethane emulsion. The resulting emulsion had a solids content of 68%, a viscosity of 90mPa.s, a pH: 7.37.
the preparation method of the foaming resin comprises the steps of adding 3% of foaming agent, 0.3% of wetting agent and 0.2% of flatting agent into the high-solid-content aqueous polyurethane emulsion in the stirring process, uniformly dispersing the auxiliary agent at a low speed, increasing the stirring speed to 800-1300r/min, and adding about 1.4% of aqueous polyurethane thickener after reaching a proper foaming ratio until reaching a proper viscosity.
Example 4
Adding 600g of polypropylene glycol and 76g of sulfonic acid type polyester polyol into a four-neck flask provided with a stirrer and a thermometer, heating to 120 ℃, vacuumizing for dehydration, wherein the vacuum degree is-0.08 Mpa, cooling to below 75 ℃ after 1.5h, replacing a vacuum pipe orifice with a condensation reflux pipe, adding 119.00g of IPDI, 30.00g of HDI and 0.32g of dibutyl tin dilaurate, uniformly mixing, heating to 90-95 ℃, and reacting for 2 h; the temperature of the obtained prepolymer is reduced to 60 ℃, 4.2g of trimethylpentanediol and 18.00g of dimethylolpropionic acid are added, simultaneously, acetone is added to control the viscosity of a reaction system, and chain extension reaction is carried out at the temperature of 70-75 ℃ for 3 hours to obtain the prepolymer. And transferring the prepolymer into an emulsifying kettle, adding 13.56g of triethylamine, adding water under high-speed shearing for emulsification, adding 26.33g of 10% ethylenediamine aqueous solution at the water temperature of 20-25 ℃, uniformly dispersing, and removing acetone in vacuum to obtain the water-based high-solid polyurethane emulsion. The solid content of the obtained emulsion was 65%, the viscosity was 60mpa.s, the pH: 7.22.
the preparation method of the foaming resin comprises the steps of adding 5% of foaming agent, 0.5% of wetting agent and 0.1% of flatting agent into the high-solid-content aqueous polyurethane emulsion in the stirring process, uniformly dispersing the auxiliary agent at a low speed, increasing the stirring speed to 800-1300r/min, and adding about 2.1% of aqueous polyurethane thickener after reaching a proper foaming ratio until reaching a proper viscosity.
The aqueous high-solid polyurethane emulsions obtained in examples 1 to 4 were subjected to film formation, and the performance of the aqueous high-solid polyurethane emulsions prepared by the prior art was measured by the same method, and the results are shown in table one.
| Group of | Tensile Strength (MPa) | Elongation at Break (%) | Water absorption (%) | Yellowing resistance | Alkali resistance (24h) |
| Example 1 | 13.56 | 427.6 | 45.32 | Second stage | Slight whiting |
| Example 2 | 18.77 | 483.00 | 40.21 | Second stage | No abnormality |
| Example 3 | 15.12 | 410.52 | 38.88 | Second stage | No abnormality |
| Example 4 | 14.55 | 463.85 | 35.68 | Second stage | No abnormality |
| Comparative example 1 | 10.93 | 202.83 | 48.89 | Three-stage | Whitening hair |
Physical property index of surface-water polyurethane adhesive film
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The water-based high-solid foaming resin for synthetic leather is characterized by comprising the following components in parts by weight: the composition comprises the following substances in parts by weight:
55-65% of water-based high-solid foaming polyurethane emulsion, 30-40% of water, 2-5% of foaming agent, 0.1-0.5% of wetting agent, 0.1-0.5% of flatting agent and 1-3% of water-based polyurethane thickener.
2. The waterborne high-solid foaming resin for synthetic leather according to claim 1, wherein the foaming resin comprises the following components in percentage by weight: the water-based high-solid foaming polyurethane emulsion comprises the following substances in parts by weight:
60-70% of polyether polyol, 8-10% of sulfonic polyester polyol, 18-25% of diisocyanate, 0.01-0.05% of catalyst, 0.5-1.5% of micromolecule chain extender, 1.7-3.2% of hydrophilic chain extender, 1.1-2.2% of alkaline neutralizer and 0.2-0.3% of amine chain extender.
3. The synthetic water leather high-solid foaming resin as claimed in claim 1, which is characterized in that:
the molecular weight of the polyether polyol is 2000;
the polyether polyol is any one or a mixture of any two or more of polyethylene glycol, polypropylene glycol and polytetrahydrofuran glycol in any proportion;
the hydroxyl value of the polyethylene glycol is 58-63 mgKOH/g;
the hydroxyl values of the polypropylene glycol are respectively 51-62 mgKOH/g;
the hydroxyl value of the polytetrahydrofuran diol is 54-57 mgKOH/g.
4. The waterborne high-solid foaming resin for synthetic leather according to claim 1, wherein the foaming resin comprises the following components in percentage by weight: the molecular weight of the sulfonic acid type polyester is 1000, and the hydroxyl value is 95-100 mgKOH/g.
5. The waterborne high-solid foaming resin for synthetic leather according to claim 1, wherein the foaming resin comprises the following components in percentage by weight:
the diisocyanate is one or a mixture of two of isophorone diisocyanate and hexamethylene diisocyanate which are mixed in any proportion;
the catalyst is any one of dibutyl tin dilaurate or stannous octoate;
the micromolecule chain extender is a mixture of any one or two of neopentyl glycol or trimethyl pentanediol mixed in any proportion;
the hydrophilic chain extender is dimethylolpropionic acid;
the alkaline neutralizing agent is triethylamine;
the amine chain extender is any one of hydrazine hydrate, ethylenediamine and isophorone diamine.
6. The waterborne high-solid foaming resin for synthetic leather according to claim 1, wherein the foaming resin comprises the following components in percentage by weight: the foaming agent is a polystyrene foaming agent.
7. The waterborne high-solid foaming resin for synthetic leather according to claim 1, wherein the foaming resin comprises the following components in percentage by weight: the wetting agent is alkylphenol polyoxyethylene ether nonionic wetting agent.
8. The waterborne high-solid foaming resin for synthetic leather according to claim 1, wherein the foaming resin comprises the following components in percentage by weight: the leveling agent is an organic silicon leveling agent.
9. The waterborne high-solid foaming resin for synthetic leather according to claim 1, wherein the foaming resin comprises the following components in percentage by weight: the thickening agent is a water-based polyurethane thickening agent.
10. A preparation method of water-based high-solid foaming resin for synthetic leather is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: weighing polyether polyol, sulfonic polyester polyol, diisocyanate, a catalyst, a micromolecular chain extender, a hydrophilic chain extender, an alkaline neutralizer and an amine chain extender according to a ratio;
step two: adding polyether polyol and sulfonic acid polyester polyol into a reactor, adding diisocyanate and a catalyst under the protection of nitrogen, and reacting at the temperature of 80-90 ℃ for 1-2 hours to obtain a prepolymer;
step three: cooling the temperature of the prepolymer obtained in the step three to 50-70 ℃, adding a micromolecule chain extender and a hydrophilic chain extender dihydroxy, and mixing and reacting for 2-3 hours to obtain a polyurethane prepolymer containing hydrophilic groups and carboxyl groups;
step four: introducing the polyurethane prepolymer containing hydrophilic groups and carboxyl groups obtained in the step three into an emulsifying kettle, adding an alkaline neutralizing agent, adding deionized water with the volume of 75-85% of that of the polyurethane prepolymer containing hydrophilic groups and carboxyl groups at the temperature of 20-25 ℃ and the rotating speed of 800-1300r/min for emulsification for 3-5min, adding an amine chain extender, continuing stirring and dispersing for 10-30min after the addition of the amine chain extender is finished, and removing the organic solvent in vacuum to obtain the aqueous high-solid polyurethane emulsion;
step five: weighing the water-based high-solid foaming polyurethane emulsion, the foaming agent, the wetting agent, the leveling agent and the water-based polyurethane thickener according to the proportion;
step six: and (2) putting the water-based high-solid-content polyurethane emulsion into a reactor, adding a foaming agent, a wetting agent and a flatting agent under the stirring condition, stirring and dispersing uniformly, increasing the stirring rotating speed to 800-1300r/min, monitoring the foaming rate in real time, adding a water-based polyurethane thickener after the preset foaming rate is reached, and adjusting to the preset viscosity to obtain the water-based high-solid foaming resin.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114907545A (en) * | 2022-06-06 | 2022-08-16 | 合肥科天水性科技有限责任公司 | High-solid-content waterborne polyurethane for super-soft synthetic leather dry-process mechanical foaming coating |
| CN115323085A (en) * | 2022-08-10 | 2022-11-11 | 上海金狮化工有限公司 | Roller coating repairing agent and preparation method thereof |
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| CN107840937A (en) * | 2017-10-31 | 2018-03-27 | 上海华峰新材料研发科技有限公司 | Solvent-free aqueous polyurethane dispersion of extrusion molding and its preparation method and application |
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| CN104262571A (en) * | 2014-09-19 | 2015-01-07 | 上海蓝欧化工科技有限公司 | Preparation method and application of soft high-solid-content waterborne polyurethane resin |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114907545A (en) * | 2022-06-06 | 2022-08-16 | 合肥科天水性科技有限责任公司 | High-solid-content waterborne polyurethane for super-soft synthetic leather dry-process mechanical foaming coating |
| CN115323085A (en) * | 2022-08-10 | 2022-11-11 | 上海金狮化工有限公司 | Roller coating repairing agent and preparation method thereof |
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