CN114395359A - High-strength water-based polyurethane adhesive and preparation method thereof - Google Patents
High-strength water-based polyurethane adhesive and preparation method thereof Download PDFInfo
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- CN114395359A CN114395359A CN202111193531.3A CN202111193531A CN114395359A CN 114395359 A CN114395359 A CN 114395359A CN 202111193531 A CN202111193531 A CN 202111193531A CN 114395359 A CN114395359 A CN 114395359A
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- 229920002635 polyurethane Polymers 0.000 title claims abstract description 46
- 239000004814 polyurethane Substances 0.000 title claims abstract description 46
- 239000000853 adhesive Substances 0.000 title claims abstract description 43
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 47
- 229920005749 polyurethane resin Polymers 0.000 claims abstract description 38
- 239000004970 Chain extender Substances 0.000 claims abstract description 24
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 22
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 22
- 150000003839 salts Chemical class 0.000 claims abstract description 21
- 239000002562 thickening agent Substances 0.000 claims abstract description 21
- 239000003054 catalyst Substances 0.000 claims abstract description 18
- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical compound [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 claims abstract description 18
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 16
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 16
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 15
- 229920005862 polyol Polymers 0.000 claims abstract description 12
- 150000003077 polyols Chemical class 0.000 claims abstract description 12
- 239000013530 defoamer Substances 0.000 claims abstract description 3
- 239000002518 antifoaming agent Substances 0.000 claims description 23
- 238000006243 chemical reaction Methods 0.000 claims description 21
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical group CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 15
- 239000002253 acid Substances 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000004321 preservation Methods 0.000 claims description 14
- 150000005846 sugar alcohols Polymers 0.000 claims description 14
- 150000007519 polyprotic acids Polymers 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 10
- 229920000180 alkyd Polymers 0.000 claims description 10
- 229920005989 resin Polymers 0.000 claims description 10
- 239000011347 resin Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- PTBDIHRZYDMNKB-UHFFFAOYSA-N 2,2-Bis(hydroxymethyl)propionic acid Chemical compound OCC(C)(CO)C(O)=O PTBDIHRZYDMNKB-UHFFFAOYSA-N 0.000 claims description 5
- JVYDLYGCSIHCMR-UHFFFAOYSA-N 2,2-bis(hydroxymethyl)butanoic acid Chemical compound CCC(CO)(CO)C(O)=O JVYDLYGCSIHCMR-UHFFFAOYSA-N 0.000 claims description 5
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 5
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 5
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- 229920006243 acrylic copolymer Polymers 0.000 claims description 5
- 150000001412 amines Chemical class 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 229920001568 phenolic resin Polymers 0.000 claims description 5
- 239000005011 phenolic resin Substances 0.000 claims description 5
- -1 polyoxy Polymers 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 150000003505 terpenes Chemical class 0.000 claims description 5
- 235000007586 terpenes Nutrition 0.000 claims description 5
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 3
- 150000002085 enols Chemical class 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 4
- 239000007787 solid Substances 0.000 abstract description 4
- 238000005189 flocculation Methods 0.000 abstract description 3
- 230000016615 flocculation Effects 0.000 abstract description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 3
- 239000002904 solvent Substances 0.000 description 2
- 239000012940 solvent-free polyurethane adhesive Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000012941 solvent-based polyurethane adhesive Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
-
- 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
- C08G18/30—Low-molecular-weight compounds
- C08G18/34—Carboxylic acids; Esters thereof with monohydroxyl compounds
- C08G18/348—Hydroxycarboxylic acids
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses a high-strength water-based polyurethane adhesive, which is characterized in that: the formula of the high-strength water-based polyurethane adhesive comprises the following components in parts by weight: 100-160 parts of waterborne polyurethane resin, 40-60 parts of hydrophilic chain extender, 40-60 parts of polyol, 20-45 parts of salt forming agent, 10-25 parts of thickener, 8-20 parts of flatting agent, 10-20 parts of defoamer, 8-16 parts of antioxidant, 15-25 parts of stannous octoate catalyst, 40-80 parts of acrylic resin and 6-15 parts of cross-linking agent; according to the invention, the acrylic resin is adopted in the formula, the acrylic resin and the waterborne polyurethane resin play a role in synergy, and the hydrophilic chain extender is adopted to avoid the defects of easy flocculation, poor stability, skinning and low solid content of the waterborne polyurethane adhesive to a certain extent.
Description
Technical Field
The invention belongs to the technical field of waterborne polyurethane adhesives, and particularly relates to a high-strength waterborne polyurethane adhesive; in particular to a preparation method of the high-strength water-based polyurethane adhesive.
Background
The polyurethane adhesive has good comprehensive performance and performance adjustability, so the polyurethane adhesive is widely applied to bonding of buildings, automobiles, family decoration, packaging, printing, leather, artware and the like. Currently, polyurethane adhesives are classified into solvent-based, solvent-free, and aqueous polyurethane adhesives from the viewpoint of the use system. The solvent type polyurethane adhesive has the defects of environmental pollution and low solid content, and has great harm to operators in the gluing process. The solvent-free polyurethane adhesive is just developed in China, the synthesis process is complex, the performance obtained at present cannot be compared with that of a solvent-based polyurethane adhesive, the solvent-free polyurethane adhesive is mainly used for bonding a composite film, but has the advantage of environmental protection, and still needs to be developed vigorously.
However, the single aqueous polyurethane in the polyurethane adhesive has poor performance, mainly manifested by poor wettability to non-polar substrates, low adhesive strength and low initial adhesion, and cannot meet the requirements of various fields. In order to improve the performance of the waterborne polyurethane and expand the application field of the waterborne polyurethane, the waterborne polyurethane needs to be modified, so a high-strength waterborne polyurethane adhesive and a preparation method thereof are provided.
Disclosure of Invention
The invention aims to provide a high-strength water-based polyurethane adhesive and a preparation method thereof, and aims to solve the problems of poor wettability, low bonding strength and low initial adhesion to a non-polar substrate and incapability of meeting the requirements of various fields in the background art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the high-strength aqueous polyurethane adhesive comprises the following components in parts by weight: 100-160 parts of waterborne polyurethane resin, 40-60 parts of hydrophilic chain extender, 40-60 parts of polyol, 20-45 parts of salt forming agent, 10-25 parts of thickener, 8-20 parts of flatting agent, 10-20 parts of defoamer, 8-16 parts of antioxidant, 15-25 parts of stannous octoate catalyst, 40-80 parts of acrylic resin and 6-15 parts of cross-linking agent;
the waterborne polyurethane resin is prepared from micromolecular polybasic acid and micromolecular polyalcohol, wherein the micromolecular polybasic acid and the micromolecular polyalcohol are prepared according to the molar ratio of alkyd acid to alkyd acid of 1: 1-1.4: 1, adding the mixture into a reaction container, adding a stannous octoate catalyst, gradually heating to 220-230 ℃ under the protection of nitrogen, and carrying out heat preservation reaction for 90-120 minutes; then decompressing to-0.095 to-0.1 MPa at the temperature of 220-230 ℃, and stopping the reaction after the acid value is reduced to below 1.0, thus obtaining the waterborne polyurethane resin.
As a preferred technical scheme, the thickening agent is one or a mixture of more of terpene resin, phenolic resin, acrylic copolymer and rosin resin; the salt forming agent is triethylamine; the defoaming agent is a polyoxy enol amine ether defoaming agent; the leveling agent is a modified organic silicon leveling agent.
As a preferable technical solution, the hydrophilic chain extender is one or a combination of two of dimethylolpropionic acid and dimethylolbutyric acid.
As a preferred technical scheme, the formula of the high-strength water-based polyurethane adhesive comprises the following components in parts by weight: 100 parts of waterborne polyurethane resin, 40 parts of hydrophilic chain extender, 40 parts of polyol, 20 parts of salt forming agent, 10 parts of thickening agent, 8 parts of flatting agent, 10 parts of defoaming agent, 8 parts of antioxidant, 15 parts of stannous octoate catalyst, 40 parts of acrylic resin and 6 parts of crosslinking agent.
As a preferred technical scheme, the formula of the high-strength water-based polyurethane adhesive comprises the following components in parts by weight: 160 parts of waterborne polyurethane resin, 60 parts of hydrophilic chain extender, 60 parts of polyol, 45 parts of salt forming agent, 25 parts of thickening agent, 20 parts of flatting agent, 20 parts of defoaming agent, 16 parts of antioxidant, 25 parts of stannous octoate catalyst, 80 parts of acrylic resin and 15 parts of crosslinking agent.
As a preferred technical scheme, the formula of the high-strength water-based polyurethane adhesive comprises the following components in parts by weight: 130 parts of waterborne polyurethane resin, 50 parts of hydrophilic chain extender, 50 parts of polyol, 33 parts of salt forming agent, 18 parts of thickening agent, 16 parts of flatting agent, 15 parts of defoaming agent, 12 parts of antioxidant, 20 parts of stannous octoate catalyst, 65 parts of acrylic resin and 10 parts of crosslinking agent.
A preparation method of a high-strength water-based polyurethane adhesive comprises the following steps:
s1, preparing the waterborne polyurethane resin, namely preparing the waterborne polyurethane resin by adopting micromolecular polybasic acid and micromolecular polyalcohol;
s2, preparing materials, namely weighing all the materials according to the formula of the high-strength water-based polyurethane adhesive and strictly according to the mass parts for later use;
s3, treating the aqueous polyurethane resin, selecting the aqueous polyurethane resin, heating to 108-110 ℃, vacuumizing to-0.90-0.1 MPa, dehydrating in vacuum for 120-180 minutes, and cooling to 50-60 ℃;
s4, preparing a prepolymer, adding acrylic resin according to the dosage relation, reacting for 90-120 minutes at 50-55 ℃, heating to 70-100 ℃, and continuing to react for 100-150 minutes to obtain the prepolymer;
s5, reducing the temperature of the prepolymer to below 50 ℃, adding a hydrophilic chain extender according to the dosage relation, and then heating to 70-80 ℃ for heat preservation reaction for 2-4 hours;
s7, after the heat preservation time is reached, reducing the temperature of the prepolymer to below 50 ℃, adding a salt forming agent and a crosslinking agent, raising the temperature to 70-80 ℃ again, and carrying out heat preservation reaction for 1-2 hours;
and S8, sequentially adding the thickening agent, the defoaming agent, the flatting agent and the antioxidant into the prepolymer according to the dosage relationship, stirring at the temperature of 40-50 ℃, cooling to normal temperature and standing for 30 minutes.
As a preferable technical scheme, the stirring speed in the step S8 is 600-1200r/min, and the stirring time is 90-120 min.
The invention has the technical effects and advantages that:
according to the invention, the acrylic resin is adopted in the formula, the acrylic resin and the waterborne polyurethane resin play a role in synergy, and the hydrophilic chain extender is adopted to avoid the defects of easy flocculation, poor stability, skinning and low solid content of the waterborne polyurethane adhesive to a certain extent.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of embodiments of the invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
The high-strength aqueous polyurethane adhesive comprises the following components in parts by weight: 100 parts of waterborne polyurethane resin, 40 parts of hydrophilic chain extender, 40 parts of polyol, 20 parts of salt forming agent, 10 parts of thickening agent, 8 parts of flatting agent, 10 parts of defoaming agent, 8 parts of antioxidant, 15 parts of stannous octoate catalyst, 40 parts of acrylic resin and 6 parts of crosslinking agent;
the waterborne polyurethane resin is prepared from micromolecular polybasic acid and micromolecular polyalcohol, wherein the micromolecular polybasic acid and the micromolecular polyalcohol are prepared according to the molar ratio of alkyd acid to alkyd acid of 1: 1-1.4: 1, adding the mixture into a reaction container, adding a stannous octoate catalyst, gradually heating to 220-230 ℃ under the protection of nitrogen, and carrying out heat preservation reaction for 90-120 minutes; then decompressing to-0.095 to-0.1 MPa at the temperature of 220-230 ℃, and stopping the reaction after the acid value is reduced to below 1.0 to obtain the waterborne polyurethane resin;
the thickening agent is one or a mixture of more of terpene resin, phenolic resin, acrylic copolymer and rosin resin; the salt forming agent is triethylamine; the defoaming agent is polyoxyethylene alcohol amine ether defoaming agent; the flatting agent is a modified organic silicon flatting agent; the hydrophilic chain extender is one or the combination of two of dimethylolpropionic acid and dimethylolbutyric acid;
a preparation method of a high-strength water-based polyurethane adhesive comprises the following steps:
s1, preparing the waterborne polyurethane resin, namely preparing the waterborne polyurethane resin by adopting micromolecular polybasic acid and micromolecular polyalcohol;
s2, preparing materials, namely weighing all the materials according to the formula of the high-strength water-based polyurethane adhesive and strictly according to the mass parts for later use;
s3, treating the aqueous polyurethane resin, selecting the aqueous polyurethane resin, heating to 108-110 ℃, vacuumizing to-0.90-0.1 MPa, dehydrating in vacuum for 120-180 minutes, and cooling to 50-60 ℃;
s4, preparing a prepolymer, adding acrylic resin according to the dosage relation, reacting for 90-120 minutes at 50-55 ℃, heating to 70-100 ℃, and continuing to react for 100-150 minutes to obtain the prepolymer;
s5, reducing the temperature of the prepolymer to below 50 ℃, adding a hydrophilic chain extender according to the dosage relation, and then heating to 70-80 ℃ for heat preservation reaction for 2-4 hours;
s7, after the heat preservation time is reached, reducing the temperature of the prepolymer to below 50 ℃, adding a salt forming agent and a crosslinking agent, raising the temperature to 70-80 ℃ again, and carrying out heat preservation reaction for 1-2 hours;
s8, sequentially adding a thickening agent, a defoaming agent, a flatting agent and an antioxidant into the prepolymer according to the dosage relationship, stirring at the temperature of 40-50 ℃, cooling to normal temperature and standing for 30 minutes;
wherein the stirring speed in the step S8 is 600-1200r/min, and the stirring time is 90-120 min.
Example 2
The difference in example 1 is that:
optionally, the formula of the high-strength aqueous polyurethane adhesive comprises the following components in parts by weight: 160 parts of waterborne polyurethane resin, 60 parts of hydrophilic chain extender, 60 parts of polyol, 45 parts of salt forming agent, 25 parts of thickening agent, 20 parts of flatting agent, 20 parts of defoaming agent, 16 parts of antioxidant, 25 parts of stannous octoate catalyst, 80 parts of acrylic resin and 15 parts of crosslinking agent;
the waterborne polyurethane resin is prepared from micromolecular polybasic acid and micromolecular polyalcohol, wherein the micromolecular polybasic acid and the micromolecular polyalcohol are prepared according to the molar ratio of alkyd acid to alkyd acid of 1: 1-1.4: 1, adding the mixture into a reaction container, adding a stannous octoate catalyst, gradually heating to 220-230 ℃ under the protection of nitrogen, and carrying out heat preservation reaction for 90-120 minutes; then decompressing to-0.095 to-0.1 MPa at the temperature of 220-230 ℃, and stopping the reaction after the acid value is reduced to below 1.0 to obtain the waterborne polyurethane resin;
the thickening agent is one or a mixture of more of terpene resin, phenolic resin, acrylic copolymer and rosin resin; the salt forming agent is triethylamine; the defoaming agent is polyoxyethylene alcohol amine ether defoaming agent; the flatting agent is a modified organic silicon flatting agent; the hydrophilic chain extender is set to be one or the combination of two of dimethylolpropionic acid and dimethylolbutyric acid.
Example 3
The differences from example 1 and example 2 are:
optionally, the formula of the high-strength aqueous polyurethane adhesive comprises the following components in parts by weight: 130 parts of waterborne polyurethane resin, 50 parts of hydrophilic chain extender, 50 parts of polyol, 33 parts of salt forming agent, 18 parts of thickening agent, 16 parts of flatting agent, 15 parts of defoaming agent, 12 parts of antioxidant, 20 parts of stannous octoate catalyst, 65 parts of acrylic resin and 10 parts of crosslinking agent;
the waterborne polyurethane resin is prepared from micromolecular polybasic acid and micromolecular polyalcohol, wherein the micromolecular polybasic acid and the micromolecular polyalcohol are prepared according to the molar ratio of alkyd acid to alkyd acid of 1: 1-1.4: 1, adding the mixture into a reaction container, adding a stannous octoate catalyst, gradually heating to 220-230 ℃ under the protection of nitrogen, and carrying out heat preservation reaction for 90-120 minutes; then decompressing to-0.095 to-0.1 MPa at the temperature of 220-230 ℃, and stopping the reaction after the acid value is reduced to below 1.0 to obtain the waterborne polyurethane resin;
the thickening agent is one or a mixture of more of terpene resin, phenolic resin, acrylic copolymer and rosin resin; the salt forming agent is triethylamine; the defoaming agent is polyoxyethylene alcohol amine ether defoaming agent; the flatting agent is a modified organic silicon flatting agent; the hydrophilic chain extender is set to be one or the combination of two of dimethylolpropionic acid and dimethylolbutyric acid.
The specific formulation data for three sets of examples of the invention are given in the following table:
| example 1 | Example 2 | Example 3 | |
| Aqueous polyurethane resin | 100 portions of | 160 portions of | 130 portions of |
| Hydrophilic chain extender | 40 portions of | 60 portions of | 50 portions of |
| Polyhydric alcohols | 40 portions of | 60 portions of | 50 portions of |
| Salt forming agent | 20 portions of | 45 portions of | 33 portions of |
| Thickening agent | 10 portions of | 25 portions of | 18 portions of |
| Leveling agent | 8 portions of | 20 portions of | 16 portions of |
| Defoaming agent | 10 portions of | 20 portions of | 15 portions of |
| Antioxidant agent | 8 portions of | 16 portions of | 12 portions of |
| Stannous octoate catalyst | 15 portions of | 25 portions of | 20 portions of |
| Acrylic resin | 40 portions of | 80 portions | 65 portions of |
| Crosslinking agent | 6 portions of | 15 portions of | 10 portions of |
According to the invention, the acrylic resin is adopted in the formula, the acrylic resin and the waterborne polyurethane resin play a role in synergy, and the hydrophilic chain extender is adopted to avoid the defects of easy flocculation, poor stability, skinning and low solid content of the waterborne polyurethane adhesive to a certain extent.
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.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Claims (8)
1. A high-strength water-based polyurethane adhesive is characterized in that: the formula of the high-strength water-based polyurethane adhesive comprises the following components in parts by weight: 100-160 parts of waterborne polyurethane resin, 40-60 parts of hydrophilic chain extender, 40-60 parts of polyol, 20-45 parts of salt forming agent, 10-25 parts of thickener, 8-20 parts of flatting agent, 10-20 parts of defoamer, 8-16 parts of antioxidant, 15-25 parts of stannous octoate catalyst, 40-80 parts of acrylic resin and 6-15 parts of cross-linking agent;
the waterborne polyurethane resin is prepared from micromolecular polybasic acid and micromolecular polyalcohol, wherein the micromolecular polybasic acid and the micromolecular polyalcohol are prepared according to the molar ratio of alkyd acid to alkyd acid of 1: 1-1.4: 1, adding the mixture into a reaction container, adding a stannous octoate catalyst, gradually heating to 220-230 ℃ under the protection of nitrogen, and carrying out heat preservation reaction for 90-120 minutes; then decompressing to-0.095 to-0.1 MPa at the temperature of 220-230 ℃, and stopping the reaction after the acid value is reduced to below 1.0, thus obtaining the waterborne polyurethane resin.
2. The high-strength aqueous polyurethane adhesive according to claim 1, wherein: the thickening agent is one or a mixture of more of terpene resin, phenolic resin, acrylic copolymer and rosin resin; the salt forming agent is triethylamine; the defoaming agent is a polyoxy enol amine ether defoaming agent; the leveling agent is a modified organic silicon leveling agent.
3. The high-strength aqueous polyurethane adhesive according to claim 1, wherein: the hydrophilic chain extender is one or two of dimethylolpropionic acid and dimethylolbutyric acid.
4. The high-strength aqueous polyurethane adhesive according to claim 1, wherein: the formula of the high-strength water-based polyurethane adhesive comprises the following components in parts by weight: 100 parts of waterborne polyurethane resin, 40 parts of hydrophilic chain extender, 40 parts of polyol, 20 parts of salt forming agent, 10 parts of thickening agent, 8 parts of flatting agent, 10 parts of defoaming agent, 8 parts of antioxidant, 15 parts of stannous octoate catalyst, 40 parts of acrylic resin and 6 parts of crosslinking agent.
5. The high-strength aqueous polyurethane adhesive according to claim 1, wherein: the formula of the high-strength water-based polyurethane adhesive comprises the following components in parts by weight: 160 parts of waterborne polyurethane resin, 60 parts of hydrophilic chain extender, 60 parts of polyol, 45 parts of salt forming agent, 25 parts of thickening agent, 20 parts of flatting agent, 20 parts of defoaming agent, 16 parts of antioxidant, 25 parts of stannous octoate catalyst, 80 parts of acrylic resin and 15 parts of crosslinking agent.
6. The high-strength aqueous polyurethane adhesive according to claim 1, wherein: the formula of the high-strength water-based polyurethane adhesive comprises the following components in parts by weight: 130 parts of waterborne polyurethane resin, 50 parts of hydrophilic chain extender, 50 parts of polyol, 33 parts of salt forming agent, 18 parts of thickening agent, 16 parts of flatting agent, 15 parts of defoaming agent, 12 parts of antioxidant, 20 parts of stannous octoate catalyst, 65 parts of acrylic resin and 10 parts of crosslinking agent.
7. The preparation method of the high-strength aqueous polyurethane adhesive as claimed in claim 1, which comprises the following steps:
s1, preparing the waterborne polyurethane resin, namely preparing the waterborne polyurethane resin by adopting micromolecular polybasic acid and micromolecular polyalcohol;
s2, preparing materials, namely weighing all the materials according to the formula of the high-strength water-based polyurethane adhesive and strictly according to the mass parts for later use;
s3, treating the aqueous polyurethane resin, selecting the aqueous polyurethane resin, heating to 108-110 ℃, vacuumizing to-0.90-0.1 MPa, dehydrating in vacuum for 120-180 minutes, and cooling to 50-60 ℃;
s4, preparing a prepolymer, adding acrylic resin according to the dosage relation, reacting for 90-120 minutes at 50-55 ℃, heating to 70-100 ℃, and continuing to react for 100-150 minutes to obtain the prepolymer;
s5, reducing the temperature of the prepolymer to below 50 ℃, adding a hydrophilic chain extender according to the dosage relation, and then heating to 70-80 ℃ for heat preservation reaction for 2-4 hours;
s7, after the heat preservation time is reached, reducing the temperature of the prepolymer to below 50 ℃, adding a salt forming agent and a crosslinking agent, raising the temperature to 70-80 ℃ again, and carrying out heat preservation reaction for 1-2 hours;
and S8, sequentially adding the thickening agent, the defoaming agent, the flatting agent and the antioxidant into the prepolymer according to the dosage relationship, stirring at the temperature of 40-50 ℃, cooling to normal temperature and standing for 30 minutes.
8. The method for preparing the high-strength aqueous polyurethane adhesive according to claim 7, wherein: the stirring speed in the step S8 is 600-1200r/min, and the stirring time is 90-120 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115044338A (en) * | 2022-07-22 | 2022-09-13 | 合肥科天水性科技有限责任公司 | Water-based formaldehyde-free adhesive for cigarette packaging and preparation method and application thereof |
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| CN105820792A (en) * | 2016-05-11 | 2016-08-03 | 南京京锦元科技实业有限公司 | Waterborne polyurethane adhesive with high water resistance and strength and application thereof |
| CN109135656A (en) * | 2018-07-26 | 2019-01-04 | 广东康和新材有限公司 | A kind of water-based polyurethane adhesive and preparation method thereof |
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| CN101348703A (en) * | 2008-06-20 | 2009-01-21 | 中山大学 | Aqueous polyurethane adhesive and preparation thereof |
| CN102936480A (en) * | 2012-11-08 | 2013-02-20 | 无锡市万力粘合材料有限公司 | Waterborne polyurethane adhesive for fabric and preparation method thereof |
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