CN113861927B - Moisture-cured polyurethane hot melt adhesive with high initial adhesion strength and high adhesion fastness and preparation method thereof - Google Patents
Moisture-cured polyurethane hot melt adhesive with high initial adhesion strength and high adhesion fastness and preparation method thereof Download PDFInfo
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- 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
- C09J175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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- 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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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Abstract
The invention discloses a moisture-curing polyurethane hot melt adhesive with high initial adhesion strength and high bonding fastness and a preparation method thereof, and particularly relates to the field of hot melt adhesive preparation. The hot melt adhesive comprises 50-70 parts of polyester polyol; 5-10 parts of dihydroxy polybutadiene; 15-30 parts of polyisocyanate; 0-20 parts of tackifying resin; 0-0.5 part of catalyst; 0-1.0 parts of antioxidant; 0-1.0 part of yellowing resistant agent. The preparation method comprises material selection, reaction in a two-step reaction kettle and packaging. The moisture-curing polyurethane hot melt adhesive prepared by the method is particularly suitable for TPU film composite fabrics; the hot melt adhesive can be used for preparing a composite fabric by a roll-coating dot-shaped gluing method, and has excellent initial adhesion strength and bonding fastness; the hot melt adhesive prepared by the method can keep very soft hand feeling after being used for curing the TPU film composite fabric, and the composite fabric is durable. The hot melt adhesive product prepared by the method has high quality and low production cost, and can well meet the increasing demands of the domestic market on the moisture-curing polyurethane hot melt adhesive for bonding composite fabrics.
Description
Technical Field
The invention relates to the field of hot melt adhesive preparation, in particular to a moisture-curing polyurethane hot melt adhesive with high initial adhesion strength and high bonding fastness and a preparation method thereof.
Background
Throughout recent years of development of the adhesive industry, reactive polyurethane hot melt adhesives are one of the fastest growing adhesive varieties. This is not only due to its excellent properties, but also because such hot melt adhesives can provide excellent environmental friendliness to users. Unlike common hot melt adhesive, the reactive polyurethane hot melt adhesive has easily degraded strength, and contains isocyanate terminated (NCO) polyurethane prepolymer, which can react with water or active hydrogen in air or on adhered matter to form partially crosslinked netted structure to result in adhesion strength, chemical resistance, heat resistance, hydrolysis resistance, etc. Meanwhile, the polyurethane adhesive has the thermoplastic cold setting property of common hot melt adhesive, is simple and convenient to bond, and has the characteristics of wide range of adherable objects, large performance adjustability, good compatibility with the treated surfaces of paint surfaces and the like. 100% of solid content, no solvent and environmental protection. These make such hot melt adhesives now widely used in various fields of automobile industry, shoe industry, textile industry, wood industry, electronic industry, bookbinding, etc.
The TPU film is made into a film by calendaring, tape casting, film blowing, coating and other processes on the basis of thermoplastic polyurethane TPU elastomer particles, and has the characteristics of excellent high tension, toughness, aging resistance, water resistance and moisture permeability. The TPU film can be compounded with various fabrics such as knitted fabrics, excellent accumulated fabrics, towel fabrics, denim fabrics, talon fabrics, polar fleece fabrics, velvet fabrics, lycra fabrics and the like by a roll-coating dot-shaped gluing method, and the prepared compound fabrics integrate the functions of water resistance, moisture permeability, ventilation, wind resistance, warmth retention, antibiosis, dryness, durability, comfort and softness in wearing and the like, and are widely applied to various sports wear, jackets, windwear, cold-proof wear, ski wear, military wear, isolation wear and the like in the fields of sports, aerospace, medical treatment, fire protection and the like. Moisture-curable polyurethane hot melt adhesives (HMPURs) are the most desirable adhesives in this field because they are both polyurethanes, are very close in chemical structure, have better compatibility and adhesion in chemical properties, and are more prone to forming strong attractive forces, which lead to higher initial tack strength and higher bond fastness. However, at present, the product is basically monopolized by foreign brands, and although some domestic manufacturers break the technical monopolization in recent years to push out the moisture-curing polyurethane hot melt adhesive (HMPUR), the product cannot be applied to high-grade brand fabrics with higher requirements in terms of initial adhesion strength and bonding fastness compared with imported products.
Disclosure of Invention
Therefore, the invention provides the moisture-curing polyurethane hot melt adhesive with high initial adhesion strength and high bonding fastness and the preparation method thereof, so as to solve the problems that the quality of the existing domestic products is low, the cost is high, the requirements of the domestic market cannot be met, and the like.
In order to achieve the above object, the present invention provides the following technical solutions:
according to the moisture-curing polyurethane hot melt adhesive with high initial adhesion strength and high adhesion fastness provided by the invention, the moisture-curing polyurethane hot melt adhesive comprises the following components in parts by weight: 50-70 parts of polyester polyol; 5-10 parts of dihydroxy polybutadiene; 15-30 parts of polyisocyanate; 0-20 parts of tackifying resin; 0-0.5 part of catalyst; 0-1.0 parts of antioxidant; 0-1.0 part of yellowing resistant agent.
Further, the polyester polyol includes amorphous polyester polyol, liquid polyester polyol and crystalline polyester polyol.
Further, the amorphous polyester polyol comprises the reaction product of neopentyl glycol and/or hexanediol with phthalic acid or phthalic anhydride; the content of the amorphous polyester polyol is 5-25% of the total polyol.
Preferably, the amorphous polyester polyol is present in an amount of 10 to 20% by weight of the total polyol.
Further, the liquid polyester polyol comprises the reaction product of one or more diols of neopentyl glycol, hexanediol and butanediol and one or more diacids of adipic acid, phthalic acid, terephthalic acid and isophthalic acid, and the viscosity of the liquid polyester polyol is greater than 10000cps at 80 ℃; the content of the liquid polyester polyol is 20-70% of the total polyol.
Preferably, the liquid polyester polyol is present in an amount of 40 to 50% by weight of the total polyol.
Further, the crystalline polyester polyol comprises the reaction product of one or more diols of ethylene glycol, hexanediol and butanediol and one or more diacids of adipic acid, sebacic acid and terephthalic acid; the melting point of the crystalline polyester polyol is 40-120 ℃; the content of the crystalline polyester polyol accounts for 10-40% of the total polyol.
Preferably, the crystalline polyester polyol is present in an amount of 20 to 30% by weight of the total polyol.
Further, the hydroxyl number of the dihydroxy polybutadiene is 20-50mgKOH/g; the viscosity at 40 ℃ is 3-10Pa.s.
Preferably, the hydroxyl number of the dihydroxy polybutadiene is 30-40mgKOH/g; the viscosity at 40 ℃ is 6-8Pa.s.
Further, the polyisocyanate component is a dimer acid diisocyanate.
Further, the tackifying resin is one or more of natural resin, petroleum resin or thermoplastic elastomer, wherein the natural resin comprises rosin resin, terpene resin and terpene phenolic resin; the thermoplastic elastomer comprises EVA, EAA, acrylic resin and thermoplastic polyurethane elastomer TPU; the melting point of the tackifying resin is less than 70 ℃.
Preferably, the tackifying resin is a thermoplastic polyurethane elastomer TPU selected from the group consisting of similarly structured dihydroxy polybutadiene and dimer acid diisocyanate (DDI) components.
Preferably, the tackifying resin has a melting point of less than 65 ℃.
Further, the catalyst is one or more of octoates of lead, tin and zinc; the antioxidant is any one of 2, 6-di-tert-butyl-p-cresol, antioxidant 1010 or antioxidant 1076; the yellowing-resistant agent is any one of 2-hydroxy-4-methylbenzophenone, 2- (2 '-hydroxy-3', 5 '-di-tert-butyl) phenyl-5-chlorobenzotriazole, 2- (2' -hydroxy-3 ', 5-di-tert-amyl) phenylbenzotriazole, 2- (2' -hydroxy-3 ',5' -di-tert-octyl) phenylbenzotriazole or 2-hydroxy-4-n-octoxybenzophenone.
According to another aspect of the present invention, there is provided a method for preparing the moisture-curable polyurethane hot melt adhesive having high initial adhesion and high adhesion fastness, the method comprising the steps of:
step one, selecting polyester polyol according to parts by weight: 50-70 parts; dihydroxy polybutadiene: 5-10 parts; polyisocyanates: 15-30 parts of a lubricant; tackifying resin: 0-20 parts; catalyst: 0-0.5 part; antioxidant: 0-1.0 parts; yellowing-resistant agent: 0-1.0 part of a raw material;
step two, adding 50-70 parts of selected polyester polyol, 5-10 parts of dihydroxy polybutadiene, 0-20 parts of tackifying resin, 0-1.0 part of antioxidant and 0-1.0 part of yellowing resistance agent into a reaction kettle, and dehydrating for 2-3 hours at the temperature of 115-120 ℃ and the vacuum degree of less than or equal to 0.095 MPa;
step three, cooling the mixture in the step two to 78-82 ℃, adding 15-30 parts of polyisocyanate and 0-0.5 part of catalyst into a reaction kettle, uniformly mixing, and reacting for 3 hours at 80-85 ℃ and the vacuum degree of less than or equal to 0.095 MPa;
and step four, the reactant in the step three enters a packaging bag under the protection of nitrogen to be packaged, and the moisture-curing polyurethane hot melt adhesive with high initial adhesion strength and high adhesion fastness is obtained.
The invention has the following advantages:
1. the moisture-curing polyurethane hot melt adhesive prepared by the method is particularly suitable for TPU film composite fabrics; the hot melt adhesive can be used for preparing a composite fabric by a roll-coating dot-shaped gluing method, and has excellent initial adhesion strength and bonding fastness;
2. the hot melt adhesive prepared by the method can keep very soft hand feeling after being used for curing the TPU film composite fabric, and the composite fabric is durable.
3. The hot melt adhesive product prepared by the method has high quality and low production cost, and can well meet the increasing demands of the domestic market on the moisture-curing polyurethane hot melt adhesive for bonding composite fabrics.
Detailed Description
Other advantages and advantages of the present invention will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The preparation and treatment methods used in the following examples are conventional methods unless otherwise specified.
The starting materials used in the examples described below are all commercially available unless otherwise specified.
The measurement method of each index in the following examples is as follows:
initial tack strength: according to GBT 528-2009 standard of measurement of tensile stress strain property of vulcanized rubber or thermoplastic rubber, placing a sample in a room for one hour, and measuring shearing strength by using a universal tester, wherein the adhered base material is a stainless steel sheet, and the temperature is 20-25 ℃ and the humidity is 50-60%;
open time: according to GBT13477.5-2002, test method __, section 5: measurement of tack free time the time from application to non-tacky was recorded on a smooth plate with a 0.1mm film coated with an applicator.
Fastness to washing: the composite fabric is prepared by adopting a roll coating dot gluing method, the fabric is spring spun fabric, the temperature of the melt adhesive is 85 ℃, and the gluing amount is 10g/m 2 After curing for 7 days at a temperature of 25 ℃ and a humidity of 75%, the bonding fastness of the moisture-cured polyurethane hot melt adhesive is evaluated by comparing the waterproof performance of the composite fabric before and after five times of water washing at 40 ℃ according to the standards of GB/T8629-2017 household washing and drying procedure for textile test and GB/T4744-2013 hydrostatic pressure method for detecting and evaluating the waterproof performance of textiles.
The polyester polyol P-5 is high-viscosity liquid polyester polyol produced by Qingdao Xinyutian chemical industry Co., ltd;
the polyester polyol 356T is a crystalline polyester polyol produced by Qingdao Xinyutian chemical Co., ltd;
the polyester polyol Dynacoll7130 is an amorphous polyether polyol produced by Yingchangdisan;
polyester polyol 224 is a high viscosity liquid polyester polyol produced by the Moyao polyurethane plastics manufacturing plant, texas;
the polyester polyol P-153 is amorphous polyester polyol produced by the Yao polyurethane plastics products factory of Texaw;
the polyester polyol P-40 is a high-viscosity liquid polyester polyol produced by the Yao polyurethane plastics products factory of Texas;
polyester polyol CMA-2066 is a crystalline polyester polyol produced by the company of the chemical groups of vanning;
polyester polyol CMA-66 is a crystalline polyester polyol produced by the company of the chemical groups of vantagon;
the thermoplastic polyurethane elastomer TPU is prepared from polyester polyol P-40, polyester polyol CMA-66, polyester polyol P-153, dihydroxy polybutadiene and dimer acid diisocyanate, and has a melt index: 30-50g/10min, melt viscosity (130 ℃ C.). 2000-3000Pa.s, melting point: 60 ℃.
Example 1A moisture-curable polyurethane hotmelt adhesive with high initial tack strength and high adhesive fastness and a method for the production thereof
(1) Selecting polyester polyol P-40 in parts by weight: 29 parts; polyester polyol CMA-66: 20. parts, polyester polyol P-153:12 parts; dihydroxy polybutadiene: 9 parts; dimer acid diisocyanate: 20 parts; thermoplastic polyurethane elastomer TPU:10 parts; zinc octoate: 0.1 part; antioxidant 1010:0.2 parts; 2- (2 '-hydroxy-3', 5-di-tert-amyl) phenylbenzotriazole: 0.2 parts of a raw material;
(2) adding 61 parts of selected polyester polyol, 9 parts of dihydroxy polybutadiene, 10 parts of thermoplastic polyurethane elastomer TPU, 0.2 part of antioxidant 1010 and 0.2 part of 2- (2 ' -hydroxy-3 ',5' -di-tert-octyl) phenyl benzotriazole into a reaction kettle, and dehydrating for 2-3 hours at the temperature of 120 ℃ and the vacuum degree of less than or equal to 0.095 MPa;
(3) cooling the mixture in the step (2) to 80 ℃, adding 20 parts of dimer acid diisocyanate and 0.1 part of zinc octoate into a reaction kettle, uniformly mixing, and reacting for 3 hours at the temperature of 85 ℃ and the vacuum degree of less than or equal to 0.095 MPa;
(4) and (3) the reactant in the step (3) enters a packaging bag under the protection of nitrogen to be packaged, and a product is obtained.
Example 2 moisture-curable polyurethane Hot melt adhesive with high initial adhesive Strength and high adhesive fastness and method for preparing the same
(1) The polyester polyol 224 is selected in parts by weight: 28 parts; polyester polyol CMA-2066: 20. parts, polyester polyol P-153:12 parts; dihydroxy polybutadiene: 10 parts; dimer acid diisocyanate: 20 parts; thermoplastic polyurethane elastomer TPU:10 parts; zinc octoate: 0.1 part; antioxidant 1010:0.2 parts; 2- (2 ' -hydroxy-3 ',5' -di-tert-butyl) phenyl-5-chlorobenzotriazole: 0.2 parts of a raw material;
(2) adding 60 parts of selected total polyester polyol, 10 parts of dihydroxypolybutadiene, 10 parts of thermoplastic polyurethane elastomer TPU, 0.2 part of antioxidant 1010 and 0.2 part of 2- (2 ' -hydroxy-3 ',5' -di-tert-octyl) phenyl benzotriazole into a reaction kettle, and dehydrating for 2-3 hours at the temperature of 120 ℃ and the vacuum degree of less than or equal to 0.095 MPa;
(3) cooling the mixture in the step (2) to 80 ℃, adding 20 parts of dimer acid diisocyanate and 0.1 part of zinc octoate into a reaction kettle, uniformly mixing, and reacting for 3 hours at the temperature of 85 ℃ and the vacuum degree of less than or equal to 0.095 MPa;
(4) and (3) the reactant in the step (3) enters a packaging bag under the protection of nitrogen to be packaged, and a product is obtained.
Example 3A moisture-curable polyurethane Hot melt adhesive with high initial adhesive Strength and high adhesive fastness and method for preparing the same
(1) The polyester polyol P-5 is selected according to the weight parts: 30 parts; polyester polyol 356T:18 parts of polyester polyol Dynacoll7130:12 parts; dihydroxy polybutadiene: 10 parts; dimer acid diisocyanate: 20 parts; thermoplastic polyurethane elastomer TPU:10 parts; zinc octoate: 0.1 part; antioxidant 1076:0.2 parts; 2- (2 ' -hydroxy-3 ',5' di-tert-octyl) phenylbenzotriazole: 0.2 parts of a raw material;
(2) adding 60 parts of selected total polyester polyol, 10 parts of dihydroxypolybutadiene, 10 parts of thermoplastic polyurethane elastomer TPU, 0.2 part of antioxidant 1076 and 0.2 part of 2- (2 ' -hydroxy-3 ',5' -di-tert-octyl) phenyl benzotriazole into a reaction kettle, and dehydrating for 2-3 hours at the temperature of 120 ℃ and the vacuum degree of less than or equal to 0.095 MPa;
(3) cooling the mixture in the step (2) to 80 ℃, adding 20 parts of dimer acid diisocyanate and 0.1 part of zinc octoate into a reaction kettle, uniformly mixing, and reacting for 3 hours at the temperature of 85 ℃ and the vacuum degree of less than or equal to 0.095 MPa;
(4) and (3) the reactant in the step (3) enters a packaging bag under the protection of nitrogen to be packaged, and a product is obtained.
Example 4A moisture-curable polyurethane Hot melt adhesive with high initial adhesive Strength and high adhesive fastness and method for preparing the same
(1) The polyester polyol 224 is selected in parts by weight: 35 parts; polyester polyol CMA-2066: 25. parts, polyester polyol P-153:10 parts; dihydroxy polybutadiene: 5 parts; dimer acid diisocyanate: 20 parts; thermoplastic polyurethane elastomer TPU:5 parts; zinc octoate: 0.1 part; antioxidant 1010:0.2 A part(s); 2-hydroxy-4-n-octoxybenzophenone: 0.2 parts of a raw material;
(2) adding 70 parts of selected polyester polyol, 5 parts of dihydroxy polybutadiene, 5 parts of thermoplastic polyurethane elastomer TPU, 0.2 part of antioxidant 1010 and 0.2 part of 2-hydroxy-4-n-octoxybenzophenone into a reaction kettle, and dehydrating for 2-3 hours at the temperature of 120 ℃ and the vacuum degree of less than or equal to 0.095 MPa;
(3) cooling the mixture in the step (2) to 80 ℃, adding 20 parts of dimer acid diisocyanate and 0.1 part of zinc octoate into a reaction kettle, uniformly mixing, and reacting for 3 hours at the temperature of 85 ℃ and the vacuum degree of less than or equal to 0.095 MPa;
(4) and (3) the reactant in the step (3) enters a packaging bag under the protection of nitrogen to be packaged, and a product is obtained.
Example 5A moisture-curable polyurethane Hot melt adhesive with high initial adhesive Strength and high adhesive fastness and method for preparing the same
(1) The polyester polyol P-5 is selected according to the weight parts: 40 parts; polyester polyol 356T:20 parts of a polyester polyol Dynacoll7130:10 parts; dihydroxy polybutadiene: 5 parts; dimer acid diisocyanate: 20 parts; thermoplastic polyurethane elastomer TPU:5 parts; zinc octoate: 0.1 part; antioxidant 1010:0.2 parts; 2-hydroxy-4-methylbenzophenone: 0.2 parts of a raw material;
(2) adding 70 parts of selected polyester polyol, 5 parts of dihydroxy polybutadiene, 5 parts of thermoplastic polyurethane elastomer TPU, 0.2 part of antioxidant 1010 and 0.2 part of 2-hydroxy-4-methylbenzophenone into a reaction kettle, and dehydrating for 2-3 hours at the temperature of 120 ℃ and the vacuum degree of less than or equal to 0.095 MPa;
(3) cooling the mixture in the step (2) to 80 ℃, adding 20 parts of dimer acid diisocyanate and 0.1 part of zinc octoate into a reaction kettle, uniformly mixing, and reacting for 3 hours at the temperature of 85 ℃ and the vacuum degree of less than or equal to 0.095 MPa;
(4) and (3) the reactant in the step (3) enters a packaging bag under the protection of nitrogen to be packaged, and a product is obtained.
Example 6A moisture-curable polyurethane Hot melt adhesive with high initial adhesive Strength and high adhesive fastness and method for preparing the same
(1) Selecting polyester polyol P-40 in parts by weight: 29 parts; polyester polyol CMA-66: 22. parts, polyester polyol P-153:10 parts; dihydroxy polybutadiene: 9 parts; dimer acid diisocyanate: 20 parts; c9 petroleum resin: 10 parts; zinc octoate: 0.1 part; antioxidant 1010:0.2 parts; 2-hydroxy-4-methylbenzophenone: 0.2 parts of a raw material;
(2) adding 61 parts of polyester polyol, 9 parts of dihydroxy polybutadiene, 10 parts of C9 petroleum resin, 0.2 part of antioxidant 1010 and 0.2 part of 2-hydroxy-4-methyl benzophenone into a reaction kettle, and dehydrating for 2-3 hours at the temperature of 120 ℃ and the vacuum degree of less than or equal to 0.095 MPa;
(3) cooling the mixture in the step (2) to 80 ℃, adding 20 parts of dimer acid diisocyanate and 0.1 part of zinc octoate into a reaction kettle, uniformly mixing, and reacting for 3 hours at the temperature of 85 ℃ and the vacuum degree of less than or equal to 0.095 MPa;
(4) and (3) the reactant in the step (3) enters a packaging bag under the protection of nitrogen to be packaged, and a product is obtained.
Test case
The comparative samples were selected from the TECHNOMELT PUR 7511, hangao, germany and JQ7320, bai Li Jia, guangzhou.
TABLE 1 examples 1-5 and comparative sample test results Table
From experimental test results, the initial adhesion strength of the moisture-curing polyurethane hot melt adhesive synthesized by the invention is superior to that of the TECHNOMELT PUR 7511 of Hangao in Germany and the JQ7320 of Bailijia in Guangzhou, the adhesion fastness and the hand feeling are better than those of the JQ7320, and the TECHNOMELT PUR 7511 is not superior or inferior.
While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (2)
1. The moisture-curing polyurethane hot melt adhesive with high initial adhesion strength and high bonding fastness is characterized by comprising the following components in parts by weight: polyester polyol P-40:29 parts; polyester polyol CMA-66:20 parts of polyester polyol P-153:12 parts; dihydroxy polybutadiene: 9 parts; dimer acid diisocyanate: 20 parts; thermoplastic polyurethane elastomer TPU:10 parts; zinc octoate: 0.1 part; antioxidant 1010:0.2 parts; 2- (2 '-hydroxy-3', 5-di-tert-amyl) phenylbenzotriazole: 0.2 parts;
or, polyester polyol 224:28 parts; polyester polyol CMA-2066:20 parts of polyester polyol P-153:12 parts; dihydroxy polybutadiene: 10 parts; dimer acid diisocyanate: 20 parts; thermoplastic polyurethane elastomer TPU:10 parts; zinc octoate: 0.1 part; antioxidant 1010:0.2 parts; 2- (2 ' -hydroxy-3 ',5' -di-tert-butyl) phenyl-5-chlorobenzotriazole: 0.2 parts;
or, polyester polyol P-5:30 parts; polyester polyol 356T:18 parts of polyester polyol Dynacoll7130:12 parts; dihydroxy polybutadiene: 10 parts; dimer acid diisocyanate: 20 parts; thermoplastic polyurethane elastomer TPU:10 parts; zinc octoate: 0.1 part; antioxidant 1076:0.2 parts; 2- (2 ' -hydroxy-3 ',5' di-tert-octyl) phenylbenzotriazole: 0.2 parts;
or, polyester polyol 224:35 parts; polyester polyol CMA-2066:25 parts of polyester polyol P-153:10 parts; dihydroxy polybutadiene: 5 parts; dimer acid diisocyanate: 20 parts; thermoplastic polyurethane elastomer TPU:5 parts; zinc octoate: 0.1 part; antioxidant 1010:0.2 parts; 2-hydroxy-4-n-octoxybenzophenone: 0.2 parts;
or, polyester polyol P-5:40 parts; polyester polyol 356T:20 parts of a polyester polyol Dynacoll7130:10 parts; dihydroxy polybutadiene: 5 parts; dimer acid diisocyanate: 20 parts; thermoplastic polyurethane elastomer TPU:5 parts; zinc octoate: 0.1 part; antioxidant 1010:0.2 parts; 2-hydroxy-4-methylbenzophenone: 0.2 parts;
or, polyester polyol P-40:29 parts; polyester polyol CMA-66:22 parts of polyester polyol P-153:10 parts; dihydroxy polybutadiene: 9 parts; dimer acid diisocyanate: 20 parts; c9 petroleum resin: 10 parts; zinc octoate: 0.1 part; antioxidant 1010:0.2 parts; 2-hydroxy-4-methylbenzophenone: 0.2 parts.
2. A process for preparing a moisture-curable polyurethane hot melt adhesive having high green strength and high bond fastness as claimed in claim 1, comprising the steps of:
step one, selecting polyester polyol according to parts by weight: 50-70 parts; dihydroxy polybutadiene: 5-10 parts; polyisocyanates: 15-30 parts of a lubricant; tackifying resin: 0-20 parts; catalyst: 0-0.5 part; antioxidant: 0-1.0 parts; yellowing-resistant agent: 0-1.0 part of a raw material;
step two, adding 50-70 parts of selected polyester polyol, 5-10 parts of dihydroxy polybutadiene, 0-20 parts of tackifying resin, 0-1.0 part of antioxidant and 0-1.0 part of yellowing resistance agent into a reaction kettle, and dehydrating for 2-3 hours at the temperature of 115-120 ℃ and the vacuum degree of less than or equal to 0.095 MPa;
step three, cooling the mixture in the step two to 78-82 ℃, adding 15-30 parts of polyisocyanate and 0-0.5 part of catalyst into a reaction kettle, uniformly mixing, and reacting for 3 hours at 80-85 ℃ and the vacuum degree of less than or equal to 0.095 MPa;
step four, the reactant in the step three enters a packaging bag under the protection of nitrogen to be packaged, and the moisture-curing polyurethane hot melt adhesive with high initial adhesion strength and high bonding fastness is obtained;
the polyester polyol is a mixture of polyester polyol P-40, polyester polyol CMA-66 and polyester polyol P-153;
or, a mixture of copolyester polyol 224, polyester polyol CMA-2066 and polyester polyol P-153;
or, a mixture of copolyester polyol P-5, polyester polyol 356T, and polyester polyol Dynacoll 7130;
or, a mixture of copolyester polyol 224, polyester polyol CMA-2066 and polyester polyol P-15;
or, a mixture of copolyester polyol P-5, polyester polyol 356T, and polyester polyol Dynacoll 7130;
or a mixture of copolyester polyol P-40, polyester polyol CMA-66 and polyester polyol P-153.
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| CN112708101A (en) * | 2020-12-24 | 2021-04-27 | 辽宁恒星精细化工有限公司 | Preparation method of thermoplastic polyurethane elastomer for reactive hot melt adhesive |
| CN113046014A (en) * | 2021-03-22 | 2021-06-29 | 杭州之江新材料有限公司 | Low-viscosity high-initial-viscosity polyurethane hot melt adhesive and preparation method thereof |
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2021
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112708101A (en) * | 2020-12-24 | 2021-04-27 | 辽宁恒星精细化工有限公司 | Preparation method of thermoplastic polyurethane elastomer for reactive hot melt adhesive |
| CN113046014A (en) * | 2021-03-22 | 2021-06-29 | 杭州之江新材料有限公司 | Low-viscosity high-initial-viscosity polyurethane hot melt adhesive and preparation method thereof |
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| 李子东等.胶黏剂助剂.《胶黏剂助剂》.化学工业出版社,2009, * |
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