CN113249080A - Water-dispersible hot melt adhesive and preparation method thereof - Google Patents
Water-dispersible hot melt adhesive 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
- C09J175/06—Polyurethanes from polyesters
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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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- 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
- C09J11/08—Macromolecular additives
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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
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Abstract
The invention discloses a water dispersible hot melt adhesive and a preparation method thereof, wherein the water dispersible hot melt adhesive is prepared from the following raw materials in parts by weight: 0.001-0.005 part of catalyst, 0.1-2 parts of auxiliary agent, 0.05-5 parts of hydrophilic group cross-linking agent, 0.5-1.2 parts of neutralizing agent, 1.8-4 parts of chain extender solution, 4-8 parts of mixed alcohol solution, 6-10 parts of isocyanate, 8-15 parts of ketone solvent, 20-30 parts of polyester polyol and/or polyether polyol and 40-50 parts of deionized water. The water dispersible hot melt adhesive disclosed by the invention is liquid at normal temperature, has moderate viscosity and low use temperature, can complete melt bonding at 90-110 ℃ (the lowest temperature is 90 ℃), has strong bonding force, and has good applicability to film base materials with poor heat resistance.
Description
Technical Field
The invention relates to the technical field of hot melt adhesives, and particularly relates to a water dispersible hot melt adhesive and a preparation method thereof.
Background
With the increasingly strict national requirements on environmental protection, the hot melt adhesive has strong bonding force and almost no VOC (volatile organic compounds) and is popular in the industries of flexible packaging, decorative materials and the like. However, the hot melt adhesive is usually bonded by first converting a solid hot melt adhesive into a molten viscous fluid at a high temperature, then applying a mechanical force to the surface of an adherend by a certain process, and cooling to complete bonding. The melting temperature is high (120-180 ℃), the power consumption is large, and the use of some heat-sensitive base materials, particularly flexible packaging materials (PE, PVC and the like) is limited. In addition, the viscosity of the molten glue solution is also high, the difficulty in obtaining a product with a thin glue layer is high, and the use cost is increased.
The aqueous adhesive has low viscosity, moderate drying temperature and easy control of the process, but the adhesive force is generally poor. If the advantages of the hot melt adhesive and the water-based adhesive are combined, the performance and the use convenience of the product can be greatly enhanced.
Patent 104927747a discloses a preparation method of an aqueous polyurethane hot melt adhesive, which does not use a cross-linking agent, does not use a mixed alcohol solution, and is different in preparation method, wherein the melting point of an adhesive film is 130-140 ℃, and the adhesive film is not suitable for a film base material with poor heat resistance.
Disclosure of Invention
The invention provides a water-dispersible hot melt adhesive and a preparation method thereof, wherein the water-dispersible hot melt adhesive can complete melt bonding at 90-110 ℃ (the lowest temperature is 90 ℃), has strong bonding force, and has good applicability to film base materials with poor heat resistance.
The invention adopts the following technical scheme for solving the technical problems:
the water dispersible hot melt adhesive is prepared from the following raw materials in parts by weight: 0.001-0.005 part of catalyst, 0.1-2 parts of auxiliary agent, 0.05-5 parts of hydrophilic group cross-linking agent, 0.5-1.2 parts of neutralizing agent, 1.8-4 parts of chain extender solution, 4-8 parts of mixed alcohol solution, 6-10 parts of isocyanate, 8-15 parts of ketone solvent, 20-30 parts of polyester polyol and/or polyether polyol and 40-50 parts of deionized water.
The inventor of the invention finds that the water dispersible hot melt adhesive is liquid at normal temperature, has moderate viscosity and low use temperature, can complete melt bonding at 90-110 ℃ (minimum 90 ℃), has strong bonding force, and has good applicability to film base materials with poor heat resistance.
Preferably, the hydrophilic group cross-linking agent is one or more of an aziridine cross-linking agent, a carbodiimide cross-linking agent and a metal complex ion cross-linking agent.
As a preferred embodiment, the aziridine crosslinking agent is preferably one or more of trimethylolpropane-tris [3- (2-methylaziridinyl) ] propionate, trimethylolpropane-tris (3-aziridinyl) propionate, pentaerythritol-tetrakis (3-aziridinyl) propionate.
Preferably, the carbodiimide-based crosslinking agent is an aromatic carbodiimide polymer.
Preferably, the metal complex ion crosslinking agent is one or more of copper tetraammine sulfate, zinc tetraammine sulfate and zinc tetraammine nitrate.
Preferably, the polyester polyol and/or polyether polyol (the polyester polyol and/or polyether polyol may be a polyester polyol, a polyether polyol, or a polyester polyol or polyether polyol) is one or more of polytetrahydrofuran ether glycol having a molecular weight of 2000 to 4000, polyethylene adipate glycol, polyethylene adipate-1, 4-butanediol glycol, 1, 6-hexanediol adipate glycol, polyethylene adipate-ethylene glycol-1, 4-butanediol glycol, 1, 6-hexanediol adipate-neopentyl glycol-1, 6-hexanediol adipate glycol, 1, 2-propanediol adipate glycol, and diethylene adipate glycol.
As a preferred scheme, the chain extender solution is polyamine chain extender solution; the chain extender solution is prepared by compounding one or more of ethylenediamine, hexamethylenediamine and p-phenylenediamine with a solvent.
Preferably, the isocyanate is hexamethylene diisocyanate and one or more of isophorone diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate or dicyclohexylmethane diisocyanate.
The inventor of the invention finds that the transparency of the adhesive layer can be adjusted by changing the content of hexamethylene diisocyanate and the type of alcohol in mixed alcohol according to the molar ratio of the hexamethylene diisocyanate to other polyisocyanates of 9: 1-0: 10, so as to achieve different transparencies.
Preferably, the catalyst is an organometallic catalyst.
As a preferred scheme, the mixed alcohol solution is prepared by compounding short-chain polyol, carboxyl-containing dihydric alcohol and a solvent; the short-chain polyol is one or more of 1, 4-butanediol, 1, 6-hexanediol, trimethylolpropane and sulfonate dihydric alcohol, and the molecular weight is less than 1000. The dihydric alcohol containing carboxyl is one or both of dimethylolpropionic acid and dimethylolbutyric acid.
As a preferable scheme, the auxiliary agent comprises one or more of a leveling agent, a defoaming agent, a wetting agent and a cosolvent.
The invention also provides a preparation method of the water dispersible hot melt adhesive, which comprises the following steps:
s1, adding polyester polyol and/or polyether polyol into a reaction kettle, heating to 120-130 ℃, keeping the temperature and removing water, and cooling to 65-75 ℃;
s2, adding a catalyst and isocyanate, heating to 80-85 ℃, and preserving heat for 2-5 hours;
s3, adding the mixed alcohol solution, heating to 85-95 ℃, and reacting for 3-5 h;
s4, adding a ketone solvent to reduce the viscosity, cooling to 50-60 ℃, adding a neutralizer, and reacting for 5-15 min;
s5, adding deionized water under stirring, and dispersing uniformly;
s6, cooling to room temperature, dripping a chain extender solution, stirring for 15-30 min, filtering and discharging to obtain a mixture;
and S7, adding an auxiliary agent and a hydrophilic group cross-linking agent into the mixture, and uniformly stirring to obtain the water-dispersible hot melt adhesive.
As a preferable scheme, each reactant in the preparation method comprises the following components in parts by weight: 0.001-0.005 part of catalyst, 0.1-2 parts of auxiliary agent, 0.05-5 parts of hydrophilic group cross-linking agent, 0.5-1.2 parts of neutralizing agent, 1.8-4 parts of chain extender solution, 4-8 parts of mixed alcohol solution, 6-10 parts of isocyanate, 8-15 parts of ketone solvent, 20-30 parts of polyester polyol and/or polyether polyol and 40-50 parts of deionized water.
Preferably, the hydrophilic group cross-linking agent is one or more of an aziridine cross-linking agent, a carbodiimide cross-linking agent and a metal complex ion cross-linking agent.
The inventor of the invention finds in a large number of researches that the hydrophilic group cross-linking agent is added after the resin is synthesized, the latent adhesive has certain latency, can coexist with the main resin, can realize single-component use and can greatly improve the adhesive property after being completely cured, and the curing time and the final adhesive strength of the adhesive can be adjusted by changing the using amount of the hydrophilic group cross-linking agent without the limitation of an activation period.
The inventor researches and discovers that the effect cannot be achieved by using a hydrophilic group crosslinking agent except an aziridine crosslinking agent, a carbodiimide crosslinking agent and a metal complex ion crosslinking agent.
As a preferred embodiment, the aziridine crosslinking agent is preferably one or more of trimethylolpropane-tris [3- (2-methylaziridinyl) ] propionate, trimethylolpropane-tris (3-aziridinyl) propionate, pentaerythritol-tetrakis (3-aziridinyl) propionate.
Preferably, the carbodiimide-based crosslinking agent is an aromatic carbodiimide polymer.
Preferably, the metal complex ion crosslinking agent is one or more of copper tetraammine sulfate, zinc tetraammine sulfate and zinc tetraammine nitrate.
Preferably, the polyester polyol and/or polyether polyol is one or more of polytetrahydrofuran ether glycol, polyethylene adipate glycol, 1, 4-butanediol adipate glycol, 1, 6-hexanediol adipate glycol, 1, 4-butanediol adipate glycol, 1, 6-neopentyl glycol adipate glycol, 1, 6-hexanediol adipate glycol, 1, 2-propylene glycol adipate glycol and diethylene glycol adipate glycol ester glycol with the molecular weight of 2000-4000.
As a preferred scheme, the chain extender solution is polyamine chain extender solution; the chain extender solution is prepared by compounding one or more of ethylenediamine, hexamethylenediamine and p-phenylenediamine with a solvent.
Preferably, the isocyanate is hexamethylene diisocyanate and one or more of isophorone diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate or dicyclohexylmethane diisocyanate.
Preferably, the catalyst is an organometallic catalyst.
As a preferred scheme, the mixed alcohol solution is prepared by compounding short-chain polyol, carboxyl-containing dihydric alcohol and a solvent; the short-chain polyol is one or more of 1, 4-butanediol, 1, 6-hexanediol, trimethylolpropane and sulfonate dihydric alcohol, and the molecular weight is less than 1000. The dihydric alcohol containing carboxyl is one or both of dimethylolpropionic acid and dimethylolbutyric acid.
As a preferable scheme, the auxiliary agent comprises one or more of a leveling agent, a defoaming agent, a wetting agent and a cosolvent.
The invention has the beneficial effects that: (1) the water dispersible hot melt adhesive disclosed by the invention is liquid at normal temperature, has moderate viscosity and lower use temperature, can complete melt bonding at 90-110 ℃ (the lowest temperature is 90 ℃), has strong bonding force, and has good applicability to film base materials with poor heat resistance; (2) according to the invention, the hydrophilic group cross-linking agent is added after the resin is synthesized, so that the latent adhesive has certain latency, can coexist with the main resin, can realize single-component use, can greatly improve the adhesive property after being completely cured, can adjust the curing time and the final adhesive strength of the adhesive by changing the using amount of the hydrophilic group cross-linking agent, can be used in a single component, and has no limitation of an activation period.
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, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the 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
A preparation method of a water dispersible hot melt adhesive comprises the following steps:
s1, adding 700g of poly (1, 4-butylene glycol adipate) glycol (with the molecular weight of 3000) into a reaction kettle, heating to 130 ℃, keeping the temperature and removing water for 3 hours, and cooling to 65 ℃;
s2, adding 0.07g of stannous octoate, 115g of isophorone diisocyanate and 131.5g of hexamethylene diisocyanate, heating to 80 ℃, and keeping the temperature for 3 hours;
s3, dissolving 37g of 1, 4-butanediol and 47.5g of dimethylolpropionic acid in 118g N-methyl pyrrolidone to prepare a mixed alcohol solution, adding the mixed alcohol solution into a reaction kettle, heating to 85 ℃, and reacting for 3 hours;
s4, adding 300g of butanone for reducing viscosity, cooling to 60 ℃, adding 34g of triethylamine, and reacting for 5 min;
s5, adding 1500g of deionized water under stirring, and uniformly dispersing;
s6, cooling to room temperature, dissolving 16.5g of ethylenediamine in 50g of deionized water to prepare a chain extender solution, dripping the chain extender solution into the reaction kettle, stirring for 20min, filtering and discharging to obtain a mixture;
s7, adding 4g of TEGO4100 leveling agent, 2g of TEGO810 defoaming agent, 2g of TEGO wet500 wetting agent and 3.2g of trimethylolpropane-tris (3-aziridinyl) propionate into the mixture, and uniformly stirring to obtain the water-dispersible hot melt adhesive.
The solid content of the water-dispersible hot melt adhesive is 35%, and the viscosity is 300 mPa.s; storing for 1 month, coating on aluminum-plated PVC film, baking at 90 deg.C for 50s, bonding with another PVC film by hot roller at 90 deg.C, cooling to peel force of 7.8N/mm, aging at 50 deg.C for 6 hr to peel force of 14.6N/mm.
Example 2
A preparation method of a water dispersible hot melt adhesive comprises the following steps:
s1, adding 1400g of poly adipic acid-1, 6-hexanediol ester diol (molecular weight 3000) into a reaction kettle, heating to 130 ℃, keeping the temperature and removing water for 3 hours, and cooling to 70 ℃;
s2, adding 0.2g of bismuth isooctanoate, 288g of isophorone diisocyanate and 218g of hexamethylene diisocyanate, heating to 80 ℃, and keeping the temperature for 2.5 hours;
s3, dissolving 3g of trimethylolpropane, 47g of 1, 4-butanediol and 95g of dimethylolpropionic acid in 240g N-methyl pyrrolidone to prepare a mixed alcohol solution, adding the mixed alcohol solution into a reaction kettle, heating to 85 ℃, and reacting for 4 hours;
s4, adding 800g of butanone for reducing viscosity, cooling to 60 ℃, adding 50g of dimethylethanolamine, and reacting for 8 min;
s5, adding 2800g of deionized water under stirring, and uniformly dispersing;
s6, cooling to room temperature, dissolving 64g of p-phenylenediamine in 100g of acetone to prepare a chain extender solution, dripping the chain extender solution into the reaction kettle, stirring for 30min, filtering and discharging to obtain a mixture;
s7, adding 30g of TEGO4100 leveling agent, 23.4g of TEGO810 defoaming agent, 26g of TEGO wet500 wetting agent and 67g of polycarbodiimide crosslinking agent UN-557 into the mixture, and uniformly stirring to obtain the water-dispersible hot melt adhesive.
The water dispersible hot melt adhesive of the embodiment has the solid content of 29 percent and the viscosity of 350 mPa.s; storing for 1 month, coating on aluminum-plated PVC film, baking at 95 deg.C for 50s, bonding with another PVC film by hot roller at 95 deg.C, cooling, and aging at 50 deg.C for 6 hr to obtain a peel force of more than 13.3N/mm.
Example 3
A preparation method of a water dispersible hot melt adhesive comprises the following steps:
s1, adding 600g of polytetrahydrofuran ether glycol (molecular weight 3000) and 800g of poly adipic acid-1, 6-hexanediol ester glycol (molecular weight 3000) into a reaction kettle, heating to 120 ℃, keeping the temperature and removing water for 3 hours, and cooling to 75 ℃;
s2, adding 0.22g of bismuth neodecanoate, 346.5g of isophorone diisocyanate and 174.4g of hexamethylene diisocyanate, heating to 80 ℃, and keeping the temperature for 3 hours;
s3, dissolving 44g of 1, 6-hexanediol and 90g of dimethylolpropionic acid in 266g N-methyl pyrrolidone to prepare a mixed alcohol solution, adding the mixed alcohol solution into a reaction kettle, heating to 90 ℃, and reacting for 4 hours;
s4, adding 1000g of butanone for reducing viscosity, cooling to 60 ℃, adding 45g of dimethylethanolamine, and reacting for 8 min;
s5, adding 3300g of deionized water under stirring, and uniformly dispersing;
s6, cooling to room temperature, dissolving 35.5g of ethylenediamine in 200g of acetone to prepare a chain extender solution, dripping the chain extender solution into the reaction kettle, stirring for 20min, filtering and discharging to obtain a mixture;
s7, adding 30g of TEGO4100 leveling agent, 23.4g of TEGO810 defoaming agent, 26g of TEGO wet500 wetting agent and 8.36g of zinc tetraammine sulfate into the mixture, and uniformly stirring to obtain the water-dispersible hot melt adhesive.
The water dispersible hot melt adhesive of the embodiment has the solid content of 30 percent and the viscosity of 600 mPa.s; storing for 1 month, coating on aluminum-plated PVC film, baking at 100 deg.C for 50s, bonding with another PVC film by hot roller at 100 deg.C, cooling to peel off with a strength of more than 6.8N/mm, aging at 50 deg.C for 6 hr to peel off with a strength of more than 13.2N/mm.
Comparative example 1
Comparative example 1 is different from example 1 in that comparative example 1 does not add the crosslinking agent during the preparation process, but adds a water-based polyisocyanate curing agent in an amount of 3% by weight based on the total weight of the water-dispersible hot melt adhesive before use and stirs it uniformly. Since this comparative example is a two-component system, the mixture needs to be used within 6 hours.
The water dispersible hot melt adhesive hot roller in the comparative example is peeled at 5.0N/mm after being bonded with a PVC film at 100 ℃ and cured for 6 hours at 50 ℃ with the peeling force of 9.8N/mm.
Comparative example 2
Comparative example 2 differs from example 1 in that comparative example 2 does not contain the crosslinking agent, and is otherwise identical.
S1, adding 700g of poly (1, 4-butylene glycol adipate) glycol (with the molecular weight of 3000) into a reaction kettle, heating to 130 ℃, keeping the temperature and removing water for 3 hours, and cooling to 65 ℃;
s2, adding 0.07g of stannous octoate, 115g of isophorone diisocyanate and 131.5g of hexamethylene diisocyanate, heating to 80 ℃, and keeping the temperature for 3 hours;
s3, dissolving 37g of 1, 4-butanediol and 47.5g of dimethylolpropionic acid in 118g N-methyl pyrrolidone to prepare a mixed alcohol solution, adding the mixed alcohol solution into a reaction kettle, heating to 85 ℃, and reacting for 3 hours;
s4, adding 300g of butanone for reducing viscosity, cooling to 60 ℃, adding 34g of triethylamine, and reacting for 5 min;
s5, adding 1500g of deionized water under stirring, and uniformly dispersing;
s6, cooling to room temperature, dissolving 16.5g of ethylenediamine in 50g of deionized water to prepare a chain extender solution, dripping the chain extender solution into the reaction kettle, stirring for 20min, filtering and discharging to obtain a mixture;
s7, adding 4g of TEGO4100 leveling agent, 2g of TEGO810 defoaming agent and 2g of TEGO wet500 wetting agent into the mixture, and uniformly stirring to obtain the water-dispersible hot melt adhesive.
The water dispersible hot melt adhesive hot roller in the comparative example is peeled at 4.9N/mm after being bonded with a PVC film at 100 ℃ and cured for 6 hours at 50 ℃ with the peeling force of 5.5N/mm.
In light of the foregoing description of preferred embodiments according to the invention, it is clear that many changes and modifications can be made by the person skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. The water dispersible hot melt adhesive is characterized by being prepared from the following raw materials in parts by weight: 0.001-0.005 part of catalyst, 0.1-2 parts of auxiliary agent, 0.05-5 parts of hydrophilic group cross-linking agent, 0.5-1.2 parts of neutralizing agent, 1.8-4 parts of chain extender solution, 4-8 parts of mixed alcohol solution, 6-10 parts of isocyanate, 8-15 parts of ketone solvent, 20-30 parts of polyester polyol and/or polyether polyol and 40-50 parts of deionized water.
2. The water dispersible hot melt adhesive according to claim 1, wherein the hydrophilic group cross-linking agent is one or more of aziridine cross-linking agent, carbodiimide cross-linking agent and metal complex ion cross-linking agent.
3. The water dispersible hot melt adhesive according to claim 1, wherein the polyester polyol and/or polyether polyol is one or more of polytetrahydrofuran ether glycol, polyethylene adipate glycol, 1, 4-butanediol adipate glycol, 1, 6-hexanediol adipate glycol, 1, 4-butanediol adipate glycol, 1, 2-hexanediol adipate glycol, 1, 6-hexanediol adipate glycol, and diethylene adipate glycol having a molecular weight of 2000-4000.
4. The water dispersible hot melt adhesive of claim 1, wherein the chain extender solution is a polyamine chain extender solution.
5. The water dispersible hot melt adhesive according to claim 1, wherein the isocyanate is a mixture of hexamethylene diisocyanate and one or more of isophorone diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate or dicyclohexylmethane diisocyanate.
6. The water dispersible hot melt adhesive according to claim 1, wherein the mixed alcohol solution is prepared by compounding short-chain polyol, carboxyl-containing diol and a solvent.
7. The preparation method of the water dispersible hot melt adhesive is characterized by comprising the following steps:
s1, adding polyester polyol and/or polyether polyol into a reaction kettle, heating to 120-130 ℃, keeping the temperature and removing water, and cooling to 65-75 ℃;
s2, adding a catalyst and isocyanate, heating to 80-85 ℃, and preserving heat for 2-5 hours;
s3, adding the mixed alcohol solution, heating to 85-95 ℃, and reacting for 3-5 h;
s4, adding a ketone solvent to reduce the viscosity, cooling to 50-60 ℃, adding a neutralizer, and reacting for 5-15 min;
s5, adding deionized water under stirring, and dispersing uniformly;
s6, cooling to room temperature, dripping a chain extender solution, stirring for 15-30 min, filtering and discharging to obtain a mixture;
and S7, adding an auxiliary agent and a hydrophilic group cross-linking agent into the mixture, and uniformly stirring to obtain the water-dispersible hot melt adhesive.
8. The preparation method of the water dispersible hot melt adhesive according to claim 7, wherein the reactants in the preparation method comprise the following components in parts by weight: 0.001-0.005 part of catalyst, 0.1-2 parts of auxiliary agent, 0.05-5 parts of hydrophilic group cross-linking agent, 0.5-1.2 parts of neutralizing agent, 1.8-4 parts of chain extender solution, 4-8 parts of mixed alcohol solution, 6-10 parts of isocyanate, 8-15 parts of ketone solvent, 20-30 parts of polyester polyol and/or polyether polyol and 40-50 parts of deionized water.
9. The preparation method of the water dispersible hot melt adhesive according to claim 7, wherein the hydrophilic group cross-linking agent is one or more of aziridine cross-linking agent, carbodiimide cross-linking agent and metal complex ion cross-linking agent;
the polyester polyol and/or polyether polyol is one or more of polytetrahydrofuran ether glycol, polyethylene glycol adipate glycol, 1, 4-butanediol adipate glycol, 1, 6-hexanediol adipate glycol, 1, 2-propylene glycol adipate glycol and diethylene glycol adipate glycol with the molecular weight of 2000-4000.
10. The preparation method of the water dispersible hot melt adhesive according to claim 7, wherein the chain extender solution is polyamine chain extender solution;
the isocyanate is formed by mixing hexamethylene diisocyanate and one or more of isophorone diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate or dicyclohexylmethane diisocyanate;
the mixed alcohol solution is prepared by compounding short-chain polyol, carboxyl-containing dihydric alcohol and a solvent.
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| CN116285646A (en) * | 2022-11-30 | 2023-06-23 | 广东邦固化学科技有限公司 | Water-based paint with excellent adhesive force to polypropylene film and preparation method thereof |
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