CN111944474A - Thermally reversible polyurethane hot melt adhesive and preparation method thereof - Google Patents
Thermally reversible polyurethane 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
- C09J175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
- C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
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- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4236—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups
- C08G18/4238—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups derived from dicarboxylic acids and dialcohols
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
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- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4833—Polyethers containing oxyethylene units
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
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- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4854—Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
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- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/67—Unsaturated compounds having active hydrogen
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
- C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
- C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
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- C08G2170/00—Compositions for adhesives
- C08G2170/20—Compositions for hot melt adhesives
Abstract
The invention discloses a heat reversible polyurethane hot melt adhesive, which comprises the following components (by weight portion): and (2) component A: 30-35 parts of polyether polyol; and (B) component: 50-55 parts of polyester polyol; and (3) component C: 0.3-0.8 part of auxiliary agent; and (3) component D: 10-15 parts of isocyanate; and (3) component E: 0-5 parts of terminal double bond acrylate; and (3) component F: 0-3 parts of a difurane compound; according to the invention, the polyurethane hot melt adhesive is prepared by scientifically and reasonably proportioning and combining the component A, the component B, the component C, the component D, the component E and the component F, the preparation method is simpler, the obtained product has wide application temperature, the final peeling strength is high, the product is particularly suitable for the field of home decoration flat pasting, and the thermally reversible polyurethane hot melt adhesive shows lower viscosity at high temperature and is beneficial to construction; at low temperature, a network structure is formed by Diels-Alder reaction crosslinking, so that the adhesive has strong cohesive force; the problems that the traditional hot melt adhesive is low in viscosity, low in cohesive force, high in viscosity and difficult to construct and foams at high temperature are solved.
Description
Technical Field
The invention relates to the technical field of polyurethane hot melt adhesives, in particular to a thermally reversible polyurethane hot melt adhesive and a preparation method thereof.
Background
The polyurethane adhesive has excellent chemical bonding force with materials containing active hydrogen, such as wood, foam plastic, paper, leather fabric and the like, and materials such as metal, glass, plastic, rubber and the like, by virtue of carbamate groups (-NHCOO-) contained in a molecular chain. Based on the increasing requirements on the environmental protection of the industry, the traditional organic solvent adhesive gradually exits the market, and the hot-melt adhesive is non-toxic and harmless due to the characteristics of the hot-melt adhesive and is environment-friendly. Therefore, the development of environment-friendly hot melt adhesives is a development trend of the adhesive industry in China.
The reactive polyurethane hot melt adhesive is called HMPUR or PUR for short, NHCOO contained in a molecular chain and NCO groups at two ends of the molecular chain can react with active hydrogen on the surface of water or a material in a molten state to form a cross-linked network; the glue in a molten state has substrate wettability, can enter an inner layer of a loose porous material, forms a glue layer with higher strength after being cured, and the reactive polyurethane hot melt adhesive (PUR) mainly reacts with a substrate film material by means of a urethane bond and a part of NCO groups.
In recent years, moisture-curing reactive hot melt adhesives are well applied to the woodworking industry. However, moisture-curable hot melt adhesives tend to foam after bonding when used at high ambient temperatures, and adhesives that can be used at high temperatures have insufficient adhesive strength at low ambient temperatures.
For example, CN201710356571 discloses a preparation method of a high temperature resistant moisture curing polyurethane hot melt adhesive, the prepared hot melt adhesive has the characteristic of high temperature resistance, can be stored at 180 ℃ for a long time, has basically no change of colloid, has viscosity of less than 10000mpa · s at 120 ℃, and is convenient for gluing; but the later bonding force is not enough for the woodwork flat pasting field; CN201811139268 discloses a polyurethane hot melt adhesive with high bonding strength and a preparation method thereof, and the prepared hot melt adhesive has the characteristics of high initial bonding strength and no need of additionally adding a tackifier; the formula adopts polyester-amide copolymerization diol, so that the melting temperature of the formula is extremely high and reaches 140 ℃, and the construction is influenced and the machine damage is inevitable; CN201811125937 discloses a polycarbonate type dual-curing polyurethane hot melt adhesive and a preparation method thereof, and the technical scheme is that polycarbonate diol is used as a soft segment, the advantages of moisture curing and light curing adhesives are combined, so that the adhesive has good bonding strength for various base materials, and the adhesive has good application prospect in the aspects of bonding and sealing of structures in the electronic industry, furniture, automotive interior, high-speed rail, airplanes and the like; acrylate chemical modifier is added into the formula, and a UV curing function is introduced, so that the system is high in viscosity and high in melting temperature; when in use, the light curing equipment is required to be equipped, and the light curing device is not suitable for the present situation of woodworking flat pasting.
Accordingly, in response to the deficiencies of the prior art, there is a need for a polyurethane adhesive that can be used over a wide range of ambient temperatures.
Disclosure of Invention
The invention aims to provide a heat reversible polyurethane hot melt adhesive and a preparation method thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a heat reversible polyurethane hot melt adhesive comprises the following components (expressed by weight portion):
and (2) component A: 30-35 parts of polyether polyol;
and (B) component: 50-55 parts of polyester polyol;
and (3) component C: 0.3-0.8 part of auxiliary agent;
and (3) component D: 10-15 parts of isocyanate;
and (3) component E: 0-5 parts of terminal double bond acrylate;
and (3) component F: 0-3 parts of a difurane compound.
Wherein the polyether polyol is polypropylene glycol or polytetrahydrofuran ether glycol, and the hydroxyl value of the polyether polyol is 15-300 mgKOH/g.
The polyester polyol is two or more polymers of adipic acid, sebacic acid, ethylene glycol, butanediol, hexanediol and neopentyl glycol, the hydroxyl value of the polyester polyol is 18-140mgKOH/g, and the number average molecular weight of the polyester polyol ranges from 1000-6000.
Wherein the auxiliary agent is an antioxidant and a leveling agent.
Wherein the isocyanate is 4, 4-diphenylmethane diisocyanate, the molecular weight of the isocyanate is 250, and the functionality of the isocyanate is 2.
Wherein, the double-bond-terminated acrylate is one or more of hydroxyethyl acrylate, hydroxyethyl methacrylate and hydroxypropyl acrylate.
Wherein the difuranyl ring compound is difurfuryl sulfide.
A preparation method of a heat reversible polyurethane hot melt adhesive comprises the following steps:
s1, respectively weighing the component A, the component B, the component C, the component D, the component E and the component F according to parts by weight by using an electronic scale, adding the weighed component A, component B and antioxidant into a reaction kettle, adjusting the temperature of the reaction kettle to 140 ℃, and stirring and dehydrating the component A, the component B and the antioxidant for 1.5 hours in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
s2, adjusting the temperature of the reaction kettle to 100 ℃, then adding the component D into the reaction kettle, adjusting the temperature of the reaction kettle to 115 ℃, and reacting for 1.0 hour in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
s3, adding the component E into a reaction kettle, keeping the temperature of the reaction kettle at 115 ℃, and reacting for 1.0 hour in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
s4, adding the component F into a reaction kettle, keeping the temperature of the reaction kettle at 115 ℃, and reacting for 1.0 hour in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
s5, adding the leveling agent into the reaction kettle, keeping the temperature of the reaction kettle at 115 ℃, and reacting for 20 minutes in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
and S6, defoaming the mixture in the reaction kettle for 10 minutes, discharging, and carrying out vacuum sealing and packaging to obtain the polyurethane hot melt adhesive.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the polyurethane hot melt adhesive is prepared by scientifically and reasonably proportioning and combining the component A, the component B, the component C, the component D, the component E and the component F, the preparation method is simpler, the obtained product has wide application temperature, the final peeling strength is high, the product is particularly suitable for the field of home decoration flat pasting, and the thermally reversible polyurethane hot melt adhesive shows lower viscosity at high temperature and is beneficial to construction; at low temperature, a network structure is formed by Diels-Alder reaction crosslinking, so that the adhesive has strong cohesive force; the problems that the traditional hot melt adhesive is low in viscosity, low in cohesive force, high in viscosity and difficult to construct and foams at high temperature are solved.
Detailed Description
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 only a part of the embodiments of the present invention, and 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.
The invention provides a technical scheme that: a heat reversible polyurethane hot melt adhesive comprises the following components (expressed by weight portion):
and (2) component A: 30-35 parts of polyether polyol;
and (B) component: 50-55 parts of polyester polyol;
and (3) component C: 0.3-0.8 part of auxiliary agent;
and (3) component D: 10-15 parts of isocyanate;
and (3) component E: 0-5 parts of terminal double bond acrylate;
and (3) component F: 0-3 parts of a difurane compound.
Wherein the polyether polyol is polypropylene glycol or polytetrahydrofuran ether glycol, and the hydroxyl value of the polyether polyol is 15-300 mgKOH/g; such as: dada Lanxingdong DL 1000, DL 2000, etc., Voranol 2120, Voranol 1000LM, etc.
Wherein the polyester polyol is two or more polymers of adipic acid, sebacic acid, ethylene glycol, butanediol, hexanediol and neopentyl glycol, the hydroxyl value of the polyester polyol is 18-140mgKOH/g, and the number average molecular weight range of the polyester polyol is 1000-6000; such as: DYNACOLL 7360, DYNACOLL 7380, DYNACOLL 7230, DYNACOLL 7250, STEPANPOL PN-110, STEPANPOL PDP-70, etc.
Wherein the auxiliary agent is an antioxidant and a flatting agent; antioxidants such as: IRGANOX 1010, IRGAFOS 168, and the like, leveling agents such as: ESTRON Resifflow, VOK-FL LF, etc.
Wherein the isocyanate is 4, 4-diphenylmethane diisocyanate, the molecular weight of the isocyanate is 250, and the functionality of the isocyanate is 2.
Wherein, the double-bond-terminated acrylate is one or more of hydroxyethyl acrylate, hydroxyethyl methacrylate and hydroxypropyl acrylate.
Wherein the difuranyl compound is difurfuryl sulfide
Embodiment 1, this embodiment provides a technical solution: a heat reversible polyurethane hot melt adhesive comprises the following components (expressed by weight portion):
polyether PPG 200033 parts;
736018 parts of polyester DYNACOLL;
725027 parts of polyester DYNACOLL;
polyester STEPANPOL PN-1108 parts;
13.5 parts of 4, 4-diphenylmethane diisocyanate;
10100.3 parts of antioxidant IRGANOX;
0.2 part of leveling agent ESTRON Resifflow;
4.5 parts of hydroxyethyl acrylate;
3.8 parts of difurfuryl sulfide.
A preparation method of a heat reversible polyurethane hot melt adhesive comprises the following steps:
s1, respectively weighing the component A, the component B, the component C, the component D, the component E and the component F according to parts by weight by using an electronic scale, adding the weighed polyether polyol, polyester polyol and antioxidant 1010 into a reaction kettle, adjusting the temperature of the reaction kettle to 140 ℃, and stirring and dehydrating the polyether polyol, polyester polyol and antioxidant 1010 in the reaction kettle for 1.5 hours under the condition that the vacuum degree is 0.095 Mpa;
s2, adjusting the temperature of the reaction kettle to 100 ℃, then adding 4, 4-diphenylmethane diisocyanate into the reaction kettle, adjusting the temperature of the reaction kettle to 115 ℃, and reacting for 1.0 hour in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
s3, adding hydroxyethyl acrylate into the reaction kettle, keeping the temperature of the reaction kettle at 115 ℃, and reacting for 1.0 hour in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
s4, adding the difurfuryl sulfide into the reaction kettle, keeping the temperature of the reaction kettle at 115 ℃, and reacting for 1.0 hour in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
s5, adding the leveling agent into the reaction kettle, keeping the temperature of the reaction kettle at 115 ℃, and reacting for 20 minutes in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
and S6, defoaming the mixture in the reaction kettle for 10 minutes, discharging, and carrying out vacuum sealing and packaging to obtain the polyurethane hot melt adhesive.
Embodiment 2, this embodiment provides a technical solution: a heat reversible polyurethane hot melt adhesive comprises the following components (expressed by weight portion):
polyether PPG 200033 parts;
736018 parts of polyester DYNACOLL;
725027 parts of polyester DYNACOLL;
polyester STEPANPOL PN-1108 parts;
13.5 parts of 4, 4-diphenylmethane diisocyanate;
10100.3 parts of antioxidant IRGANOX;
0.2 part of leveling agent ESTRON Resifflow;
2.3 parts of hydroxyethyl acrylate;
difurfuryl sulfide 1.9 parts.
A preparation method of a heat reversible polyurethane hot melt adhesive comprises the following steps:
s1, respectively weighing the component A, the component B, the component C, the component D, the component E and the component F according to parts by weight by using an electronic scale, adding the weighed polyether polyol, polyester polyol and antioxidant 1010 into a reaction kettle, adjusting the temperature of the reaction kettle to 140 ℃, and stirring and dehydrating the polyether polyol, polyester polyol and antioxidant 1010 in the reaction kettle for 1.5 hours under the condition that the vacuum degree is 0.095 Mpa;
s2, adjusting the temperature of the reaction kettle to 100 ℃, then adding 4, 4-diphenylmethane diisocyanate into the reaction kettle, adjusting the temperature of the reaction kettle to 115 ℃, and reacting for 1.0 hour in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
s3, adding hydroxyethyl acrylate into the reaction kettle, keeping the temperature of the reaction kettle at 115 ℃, and reacting for 1.0 hour in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
s4, adding the difurfuryl sulfide into the reaction kettle, keeping the temperature of the reaction kettle at 115 ℃, and reacting for 1.0 hour in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
s5, adding the leveling agent into the reaction kettle, keeping the temperature of the reaction kettle at 115 ℃, and reacting for 20 minutes in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
and S6, defoaming the mixture in the reaction kettle for 10 minutes, discharging, and carrying out vacuum sealing and packaging to obtain the polyurethane hot melt adhesive.
Embodiment 3, this embodiment provides a technical solution: a heat reversible polyurethane hot melt adhesive comprises the following components (expressed by weight portion):
polyether PPG 200033 parts;
736018 parts of polyester DYNACOLL;
725027 parts of polyester DYNACOLL;
polyester STEPANPOL PN-1108 parts;
13.5 parts of 4, 4-diphenylmethane diisocyanate;
10100.3 parts of antioxidant IRGANOX;
0.2 part of leveling agent ESTRON Resifflow;
0.5 part of hydroxyethyl acrylate;
0.4 part of difurfuryl sulfide.
A preparation method of a heat reversible polyurethane hot melt adhesive comprises the following steps:
s1, respectively weighing the component A, the component B, the component C, the component D, the component E and the component F according to parts by weight by using an electronic scale, adding the weighed polyether polyol, polyester polyol and antioxidant 1010 into a reaction kettle, adjusting the temperature of the reaction kettle to 140 ℃, and stirring and dehydrating the polyether polyol, polyester polyol and antioxidant 1010 in the reaction kettle for 1.5 hours under the condition that the vacuum degree is 0.095 Mpa;
s2, adjusting the temperature of the reaction kettle to 100 ℃, then adding 4, 4-diphenylmethane diisocyanate into the reaction kettle, adjusting the temperature of the reaction kettle to 115 ℃, and reacting for 1.0 hour in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
s3, adding hydroxyethyl acrylate into the reaction kettle, keeping the temperature of the reaction kettle at 115 ℃, and reacting for 1.0 hour in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
s4, adding the difurfuryl sulfide into the reaction kettle, keeping the temperature of the reaction kettle at 115 ℃, and reacting for 1.0 hour in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
s5, adding the leveling agent into the reaction kettle, keeping the temperature of the reaction kettle at 115 ℃, and reacting for 20 minutes in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
and S6, defoaming the mixture in the reaction kettle for 10 minutes, discharging, and carrying out vacuum sealing and packaging to obtain the polyurethane hot melt adhesive.
Comparative example 1, this example provides a solution: a heat reversible polyurethane hot melt adhesive comprises the following components (expressed by weight portion):
polyether PPG 200033 parts;
polyether PPG 200033 parts;
736018 parts of polyester DYNACOLL;
725027 parts of polyester DYNACOLL;
polyester STEPANPOL PN-1108 parts;
13.5 parts of 4, 4-diphenylmethane diisocyanate;
10100.3 parts of antioxidant IRGANOX;
0.2 part of leveling agent ESTRON Resifflow.
A preparation method of a heat reversible polyurethane hot melt adhesive comprises the following steps:
s1, respectively weighing the component A, the component B, the component C, the component D, the component E and the component F according to parts by weight by using an electronic scale, adding the weighed polyether polyol, polyester polyol and antioxidant 1010 into a reaction kettle, adjusting the temperature of the reaction kettle to 140 ℃, and stirring and dehydrating the polyether polyol, polyester polyol and antioxidant 1010 in the reaction kettle for 1.5 hours under the condition that the vacuum degree is 0.095 Mpa;
s2, adjusting the temperature of the reaction kettle to 100 ℃, then adding 4, 4-diphenylmethane diisocyanate into the reaction kettle, adjusting the temperature of the reaction kettle to 115 ℃, and reacting for 1.0 hour in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
s3, adding the leveling agent into the reaction kettle, keeping the temperature of the reaction kettle at 115 ℃, and reacting for 20 minutes in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
and S4, defoaming the mixture in the reaction kettle for 10 minutes, discharging, and carrying out vacuum sealing and packaging to obtain the polyurethane hot melt adhesive.
Example 1 is 100% theoretical end-capping, example 2 is 50% theoretical end-capping, example 3 is 10% end-capping, and comparative example 1 is 0 end-capping.
The results of the performance tests on the thermoreversible polyurethane hot melt adhesives obtained in examples 1-3 and comparative example 1 are shown in the following table (test substrate: foamed sheet; test film: flat PVC film having a dyne value of 32; the viscosity was measured at 120 ℃ using a rotational viscometer; the 24-hour peel strength was measured at ambient temperature of 5 ℃ and the high-temperature foaming was measured at ambient temperature of 40 ℃);
in conclusion, the novel raw materials and the synthesis method are introduced into the thermally reversible polyurethane hot melt adhesive, so that the low-temperature adhesive force and the high-temperature foaming performance of the reactive polyurethane hot melt adhesive are improved; according to the invention, the polyurethane hot melt adhesive is prepared by scientifically and reasonably proportioning and combining the component A, the component B, the component C, the component D, the component E and the component F, the preparation method is simpler, the obtained product has wide application temperature, the final peeling strength is high, the product is particularly suitable for the field of home decoration flat pasting, and the thermally reversible polyurethane hot melt adhesive shows lower viscosity at high temperature and is beneficial to construction; at low temperature, a network structure is formed by Diels-Alder reaction crosslinking, so that the adhesive has strong cohesive force; the problems that the traditional hot melt adhesive is low in viscosity, low in cohesive force, high in viscosity and difficult to construct and foams at high temperature are solved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The heat-reversible polyurethane hot melt adhesive is characterized by comprising the following components in parts by weight:
and (2) component A: 30-35 parts of polyether polyol;
and (B) component: 50-55 parts of polyester polyol;
and (3) component C: 0.3-0.8 part of auxiliary agent;
and (3) component D: 10-15 parts of isocyanate;
and (3) component E: 0-5 parts of terminal double bond acrylate;
and (3) component F: 0-3 parts of a difurane compound.
2. The thermally reversible polyurethane hot melt adhesive according to claim 1, wherein: the polyether glycol is polypropylene glycol or polytetrahydrofuran ether glycol, and the hydroxyl value of the polyether glycol is 15-300 mgKOH/g.
3. The thermally reversible polyurethane hot melt adhesive according to claim 1, wherein: the polyester polyol is two or more polymers of adipic acid, sebacic acid, ethylene glycol, butanediol, hexanediol and neopentyl glycol, the hydroxyl value of the polyester polyol is 18-140mgKOH/g, and the number average molecular weight of the polyester polyol ranges from 1000-6000.
4. The thermally reversible polyurethane hot melt adhesive according to claim 1, wherein: the auxiliary agent is an antioxidant and a leveling agent.
5. The thermally reversible polyurethane hot melt adhesive according to claim 1, wherein: the isocyanate is 4, 4-diphenylmethane diisocyanate, the molecular weight of the isocyanate is 250, and the functionality of the isocyanate is 2.
6. The thermally reversible polyurethane hot melt adhesive according to claim 1, wherein: the double-bond-terminated acrylate is one or more of hydroxyethyl acrylate, hydroxyethyl methacrylate and hydroxypropyl acrylate.
7. The thermally reversible polyurethane hot melt adhesive according to claim 1, wherein: the difuranyl ring compound is difurfuryl sulfide.
8. The preparation method of the thermally reversible polyurethane hot melt adhesive as claimed in any one of claims 1 to 7, characterized by comprising the following steps:
s1, respectively weighing the component A, the component B, the component C, the component D, the component E and the component F according to parts by weight by using an electronic scale, adding the weighed component A, component B and antioxidant into a reaction kettle, adjusting the temperature of the reaction kettle to 140 ℃, and stirring and dehydrating the component A, the component B and the antioxidant for 1.5 hours in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
s2, adjusting the temperature of the reaction kettle to 100 ℃, then adding the component D into the reaction kettle, adjusting the temperature of the reaction kettle to 115 ℃, and reacting for 1.0 hour in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
s3, adding the component E into a reaction kettle, keeping the temperature of the reaction kettle at 115 ℃, and reacting for 1.0 hour in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
s4, adding the component F into a reaction kettle, keeping the temperature of the reaction kettle at 115 ℃, and reacting for 1.0 hour in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
s5, adding the leveling agent into the reaction kettle, keeping the temperature of the reaction kettle at 115 ℃, and reacting for 20 minutes in the reaction kettle under the condition that the vacuum degree is 0.095 Mpa;
and S6, defoaming the mixture in the reaction kettle for 10 minutes, discharging, and carrying out vacuum sealing and packaging to obtain the polyurethane hot melt adhesive.
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Application publication date: 20201117 |