CN114644902A - Preparation method of reactive polyurethane hot melt adhesive - Google Patents
Preparation method of reactive polyurethane hot melt adhesive Download PDFInfo
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- CN114644902A CN114644902A CN202011514070.0A CN202011514070A CN114644902A CN 114644902 A CN114644902 A CN 114644902A CN 202011514070 A CN202011514070 A CN 202011514070A CN 114644902 A CN114644902 A CN 114644902A
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- resin
- hot melt
- melt adhesive
- polyurethane hot
- reactive polyurethane
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- 239000004831 Hot glue Substances 0.000 title claims abstract description 39
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 31
- 239000004814 polyurethane Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 229920005989 resin Polymers 0.000 claims abstract description 46
- 239000011347 resin Substances 0.000 claims abstract description 46
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 32
- 229920000570 polyether Polymers 0.000 claims abstract description 32
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 8
- 229910000077 silane Inorganic materials 0.000 claims abstract description 5
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 28
- 229920000728 polyester Polymers 0.000 claims description 15
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 14
- 150000002009 diols Chemical class 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 239000003054 catalyst Substances 0.000 claims description 11
- 239000003381 stabilizer Substances 0.000 claims description 11
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 9
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 8
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical group C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 125000005442 diisocyanate group Chemical group 0.000 claims description 6
- 239000012948 isocyanate Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000003208 petroleum Substances 0.000 claims description 6
- 239000004925 Acrylic resin Substances 0.000 claims description 5
- 229920000178 Acrylic resin Polymers 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 239000011888 foil Substances 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 229920005749 polyurethane resin Polymers 0.000 claims description 5
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 claims description 4
- 239000003999 initiator Substances 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 239000004526 silane-modified polyether Substances 0.000 claims description 4
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 3
- DCQBZYNUSLHVJC-UHFFFAOYSA-N 3-triethoxysilylpropane-1-thiol Chemical compound CCO[Si](OCC)(OCC)CCCS DCQBZYNUSLHVJC-UHFFFAOYSA-N 0.000 claims description 3
- UUEWCQRISZBELL-UHFFFAOYSA-N 3-trimethoxysilylpropane-1-thiol Chemical compound CO[Si](OC)(OC)CCCS UUEWCQRISZBELL-UHFFFAOYSA-N 0.000 claims description 3
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 claims description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- 229920006272 aromatic hydrocarbon resin Polymers 0.000 claims description 3
- PASDCCFISLVPSO-UHFFFAOYSA-N benzoyl chloride Chemical compound ClC(=O)C1=CC=CC=C1 PASDCCFISLVPSO-UHFFFAOYSA-N 0.000 claims description 3
- 239000012975 dibutyltin dilaurate Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- -1 paratoluenesulfonic acid isocyanate Chemical class 0.000 claims description 3
- 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 description 3
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 claims description 2
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 claims description 2
- 229920006271 aliphatic hydrocarbon resin Polymers 0.000 claims description 2
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 claims description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 2
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 6
- 239000000758 substrate Substances 0.000 abstract description 8
- 230000001070 adhesive effect Effects 0.000 abstract description 3
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 2
- 230000035699 permeability Effects 0.000 abstract description 2
- 239000003292 glue Substances 0.000 abstract 1
- 239000002981 blocking agent Substances 0.000 description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 238000001723 curing Methods 0.000 description 5
- 239000000084 colloidal system Substances 0.000 description 4
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 150000002513 isocyanates Chemical class 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical group [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920005862 polyol Polymers 0.000 description 2
- 150000003077 polyols Chemical class 0.000 description 2
- 229920001451 polypropylene glycol Polymers 0.000 description 2
- 229920000909 polytetrahydrofuran Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VLJQDHDVZJXNQL-UHFFFAOYSA-N 4-methyl-n-(oxomethylidene)benzenesulfonamide Chemical compound CC1=CC=C(S(=O)(=O)N=C=O)C=C1 VLJQDHDVZJXNQL-UHFFFAOYSA-N 0.000 description 1
- WYNCHZVNFNFDNH-UHFFFAOYSA-N Oxazolidine Chemical compound C1COCN1 WYNCHZVNFNFDNH-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 150000004705 aldimines Chemical class 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 238000006757 chemical reactions by type Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- PTGGWJSVVXVVBO-UHFFFAOYSA-N dimethoxy-[(3-methyloxiran-2-yl)oxymethoxy]-propylsilane Chemical compound CC1C(O1)OCO[Si](OC)(OC)CCC PTGGWJSVVXVVBO-UHFFFAOYSA-N 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013008 moisture curing Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 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
- C08G18/38—Low-molecular-weight compounds having heteroatoms other than oxygen
- C08G18/3893—Low-molecular-weight compounds having heteroatoms other than oxygen containing silicon
-
- 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
- C08G18/40—High-molecular-weight compounds
- C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
- C08G18/4018—Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48
-
- 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
- C08G18/40—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
-
- 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
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4266—Polycondensates having carboxylic or carbonic ester groups in the main chain prepared from hydroxycarboxylic acids and/or lactones
- C08G18/4283—Hydroxycarboxylic acid or ester
-
- 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
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4825—Polyethers containing two hydroxy groups
-
- 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
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4854—Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
-
- 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
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
-
- 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
- C08G2170/00—Compositions for adhesives
- C08G2170/20—Compositions for hot melt adhesives
Landscapes
- 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 preparation method of a reactive polyurethane hot melt adhesive, which is mainly characterized in that a silane coupling agent type end-capping reagent and a multifunctional end-silane-based polyether resin, in particular to an end-silane-based polyether resin with the functionality of 6, are simultaneously introduced into a system, corresponding preparation steps are designed, the problem that the reactive polyurethane hot melt adhesive is thick in glue application or easily generates bubbles in a humid environment is solved, and meanwhile, the adhesive property of a product to a substrate with a compact surface and poor air permeability is improved.
Description
Technical Field
The invention relates to a preparation method of a reactive polyurethane hot melt adhesive, belonging to the field of preparation and application of hot melt adhesives.
Background
The reactive polyurethane hot melt adhesive has the advantages of quick positioning, no solvent, high bonding strength, wide bonding range and the like, and is widely applied to the fields of carpentry, electronics, automobiles, household appliances, packaging and the like. Compared with the traditional thermoplastic hot melt adhesive, the adhesive has better bonding effect generally.
The polyurethane hot melt adhesive is generally prepared by polymerizing polyol and isocyanate, and the reaction type polyurethane hot melt adhesive is prepared by adjusting the proportion of the polyol and the isocyanate to ensure that the mole number of the isocyanate is excessive, so that a polymer with an isocyanate group at the tail end is synthesized, and the polymer is in contact with air or water vapor in a base material to generate a moisture curing reaction in the using process, thereby providing the bonding strength to the base material and further enhancing the body strength. However, a byproduct, namely carbon dioxide, is generated in the curing process of the reactive polyurethane hot melt adhesive, and when the carbon dioxide which is continuously increased is gathered in the colloid to form bubbles, the strength of the colloid and the bonding strength are seriously affected, and especially when the substrate is compact metal or glass, the bubbles are more easily generated.
In order to solve this problem, the industry proposes improvements, which mainly reduce the amount of the crystallization raw material and the crystallization rate, so that the gas can escape. However, such methods are effective only at the initial stage of cure and still generate bubbles within the gel when applications involving thicker bondlines are concerned.
There are also documents that latent curing agents, usually aldimine or oxazolidine latent curing agents, are added to the system raw materials, and these react with water vapor at a faster rate than isocyanate groups to produce amino-terminated compounds, which further react with isocyanate groups. The process does not generate bubbles, but the urea bond is introduced into the synthesized reactive polyurethane hot melt adhesive, the integral hardness of the product is increased, the increase of the cohesive energy can generate negative influence on the adhesion of the interface of the part, and unpleasant odor can be generated during application; particularly, when the substrate is a dense and airtight substrate such as metal or glass, carbon dioxide generated by deep curing is difficult to escape, and pores are more easily generated.
It has also been proposed in the literature to add a blocking agent, such as a silane coupling agent, to the prepolymer after synthesis to convert the terminal isocyanate groups of the polymer into alkyl groups which are also curable with moisture. However, the addition of the silane coupling agent reduces the colloidal strength to some extent.
Therefore, how to prepare the reactive polyurethane hot melt adhesive which can effectively avoid the generation of bubbles and further improve the strength of the colloid becomes a problem to be solved.
Disclosure of Invention
The invention aims to solve the technical problems and provides a preparation method of a reactive polyurethane hot melt adhesive, so that the reactive polyurethane hot melt adhesive prepared by the method not only can effectively avoid the generation of bubbles, but also can further improve the colloid strength and improve the bonding performance of a product to a substrate, especially a compact substrate.
The scheme adopted by the invention is as follows: a preparation method of a reactive polyurethane hot melt adhesive comprises the following steps:
(1) selecting raw materials, wherein the raw materials comprise the following components in parts by mass: 15-35 parts of polyether glycol, 25-40 parts of polyester glycol, 20-30 parts of tackifying resin, 10-20 parts of polyfunctional silyl-terminated polyether resin, 12-15 parts of diisocyanate, 3-5 parts of end-capping agent, 0.1-0.3 part of catalyst and 0.03-0.05 part of viscosity stabilizer;
(2) adding selected polyether diol, polyester diol and tackifying resin into a reaction kettle, heating to 120-140 ℃, and melting, stirring and mixing uniformly;
(3) vacuumizing, and dehydrating under the condition that the vacuum degree is less than 100Pa until the moisture content is less than 300 ppm;
(4) cooling to 80-90 ℃, adding diisocyanate, and stirring and reacting for 30-40min under the conditions that the vacuum degree is less than 100Pa and the temperature is 115-125 ℃;
(5) cooling to 90-110 ℃, adding a blocking agent, and stirring and reacting for 1h under the conditions that the vacuum degree is less than 100Pa and the temperature is 115-125 ℃;
(6) adding multifunctional silane-terminated polyether resin, viscosity stabilizer and catalyst, and stirring to react at 115-125 deg.C under vacuum degree of less than 100Pa for 10-15 min;
(7) and (5) rapidly discharging under the protection of nitrogen and packaging in an aluminum foil bag to obtain the aluminum foil.
In the present invention, the grade of the polyether glycol is selected from one of PPG1000 or PPG2000 using propylene oxide as an initiator, or PTMEG1000 or PTMEG2000 using tetrahydrofuran as an initiator.
The polyester diol grade is selected from one of PBA3000, PHA3500, amorphous polyester diol 7130 with molecular weight of 3000, or phthalic anhydride polyester diol R-2370 with molecular weight of 3500.
The tackifying resin can be one of acrylic resin, petroleum resin or polyurethane resin. When the tackifying resin is acrylic resin, the molecular weight is 20000-50000, the Tg temperature is 50-80 ℃, and the brand is selected from one of BR-113, BR-116, BM-19 and AC-1920; when the tackifying resin is petroleum resin, one of C5 resin, C9 resin or C5 and C9 copolymerized resin with the softening point of between 100 and 140 ℃ is preferred; when the tackifying resin is a polyurethane resin, a polyether-based TPU resin having a melting point of 50 ℃ to 100 ℃ is preferred.
The functionality of the multifunctional silane-terminated polyether resin is 6. In the present invention, when the functionality of the polyfunctional silyl-terminated polyether resin is small, the effect of maintaining the colloidal strength is insignificant; when the functionality is large, the compatibility with the host material is poor. The viscosity of the multifunctional silane-terminated polyether resin is preferably 5000-30000 cps. More specifically, the polyfunctional silane-terminated polyether resin is preferably Kerilon 201T.
The diisocyanate is diphenylmethane diisocyanate.
The viscosity stabilizer is one of phosphoric acid, paratoluenesulfonic acid isocyanate, benzoyl chloride and vinyl trimethoxy silane, and is preferably paratoluenesulfonic acid isocyanate or vinyl trimethoxy silane.
The blocking agent is a silane coupling agent, and is specifically selected from one of gamma-aminopropyl triethoxysilane, gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane, gamma-mercaptopropyl triethoxysilane and gamma-mercaptopropyl trimethoxysilane.
The catalyst is one of dibutyltin dilaurate, stannous octoate, triethylamine and dimorpholinyl diethyl ether.
The invention has the advantages that: silane coupling agent and multifunctional end silane group polyether resin, especially end silane group polyether resin with functionality of 6, are introduced into the system simultaneously, and the two have similar main structures and good compatibility. Through the combination of the end-capping reagent and the multifunctional end-silane polyether resin, the problem that the reactive polyurethane hot melt adhesive is thick in sizing or easily generates air bubbles in a humid environment is solved, and meanwhile, the bonding performance of the product to a substrate with a compact surface and poor air permeability is improved.
Detailed Description
The present invention is specifically described below with reference to examples in order to facilitate understanding of the present invention by those skilled in the art. It is to be noted herein that the examples are provided for further illustration of the invention and are not to be construed as limitations on the scope of the invention, since non-essential modifications and adaptations of the invention as described above will occur to those skilled in the art upon consideration of the present disclosure.
Example 1
A preparation method of a reactive polyurethane hot melt adhesive comprises the following steps:
(1) selecting raw materials, specifically comprising the following components in parts by mass: 35 parts of polyether glycol (PPG 2000), 25 parts of polyester glycol (PBA 3000), 25 parts of tackifying resin (acrylic resin BR-113), 10 parts of 6-functionality silane-terminated polyether resin (Kerilon 201T), 13 parts of diphenylmethane diisocyanate, 3.5 parts of a blocking agent (gamma-aminopropyltriethoxysilane), 0.1 part of a catalyst (dibutyltin dilaurate) and 0.03 part of a viscosity stabilizer (phosphoric acid);
(2) adding selected polyether diol, polyester diol and tackifying resin into a reaction kettle, heating to 120-140 ℃, and melting, stirring and mixing uniformly;
(3) vacuumizing, and dehydrating under the condition that the vacuum degree is less than 100Pa until the moisture content is less than 300 ppm;
(4) cooling to 80-90 ℃, adding diphenylmethane diisocyanate, and stirring to react for 30-40min under the conditions that the vacuum degree is less than 100Pa and the temperature is 115-125 ℃;
(5) cooling to 90-110 ℃, adding a blocking agent, and stirring and reacting for 1h under the conditions that the vacuum degree is less than 100Pa and the temperature is 115-125 ℃;
(6) adding multifunctional silane-terminated polyether resin, viscosity stabilizer and catalyst, and stirring to react at 115-125 deg.C under vacuum degree of less than 100Pa for 10-15 min;
(7) and (5) rapidly discharging under the protection of nitrogen and packaging in an aluminum foil bag to obtain the aluminum foil.
The sample obtained by the examples is labelled a 1.
Example 2
The preparation method of the reactive polyurethane hot melt adhesive is the same as the example 1 except for the raw material ratio difference.
In example 2, the selected raw materials were specifically: 15 parts of polyether glycol (PTMEG 1000), 35 parts of polyester glycol (PHA 3000), 20 parts of tackifying resin (petroleum C9 resin), 20 parts of polyfunctional silyl-terminated polyether resin (Kerilon 201T), 15 parts of diphenylmethane diisocyanate, 5 parts of blocking agent (gamma-2, 3-epoxypropoxy) propyl trimethoxy silane), 0.2 part of catalyst (stannous octoate) and 0.05 part of viscosity stabilizer (p-toluenesulfonic acid isocyanate).
The sample obtained by example 2 is labelled a 2.
Example 3
The preparation method of the reactive polyurethane hot melt adhesive is the same as the example 1 except for the raw material ratio difference.
In example 3, the selected raw materials were specifically: 20 parts of polyether glycol (PPG 1000), 40 parts of polyester glycol (R-2370), 20 parts of tackifying resin (polyether-based TPU resin Pearlbond 521), 15 parts of polyfunctional silane-terminated polyether resin (Kerilon 201T), 12 parts of diphenylmethane diisocyanate, 4 parts of a blocking agent (gamma-mercaptopropyltriethoxysilane), 0.3 part of a catalyst (triethylamine) and 0.04 part of a viscosity stabilizer (benzoyl chloride).
The sample obtained by example 3 is labelled a 3.
Example 4
The preparation process of reactive polyurethane hot melt adhesive is the same as that in example 1 except for the material compounding ratio.
In example 4, the selected raw materials were specifically: 25 parts of polyether glycol (PTMEG 2000), 30 parts of polyester glycol (7130), 25 parts of tackifying resin (polyether-based TPU resin Pearlbond 523), 15 parts of polyfunctional silane-terminated polyether resin (Kerilon 201T), 14 parts of diphenylmethane diisocyanate, 3 parts of a blocking agent (gamma-mercaptopropyltrimethoxysilane), 0.2 part of a catalyst (dimorpholindiethyl ether) and 0.05 part of a viscosity stabilizer (vinyl trimethoxysilane).
The sample obtained by example 4 is labelled a 4.
Performance testing
The samples A1-A4 obtained by the above-mentioned implementation, the existing reactive polyurethane hot melt adhesive D1 modified by end capping with a silane coupling agent and the reactive polyurethane hot melt adhesive D2 modified by adding a latent curing agent were subjected to related performance tests, and the specific results are shown in Table 1 below.
The test standards of all the performances are referred to, and specifically the test standards comprise: viscosity test HG/T3660-1999; open time HG/T3716-; NCO residual content ASTM D2572-1997; the shear strength GB/T7124-; the foaming test method comprises the steps of pouring molten hot melt adhesive into a 100mm by 50mm mold, wherein the thickness of the hot melt adhesive is 5mm, placing the hot melt adhesive for 2 hours to completely cool, placing the hot melt adhesive into different environments to solidify the hot melt adhesive, and observing the foaming conditions on the surface and inside the hot melt adhesive after 24 hours.
Table 1: and (4) a performance test table.
As is apparent from Table 1 above, the reactive polyurethane hot melt adhesive prepared by the present invention does not foam even in high temperature and high humidity environment, and the adhesive strength to dense substrates such as metal and glass is significantly improved.
Claims (9)
1. A preparation method of a reactive polyurethane hot melt adhesive is characterized by comprising the following steps:
(1) selecting raw materials, specifically comprising the following components in parts by mass: 15-35 parts of polyether glycol, 25-40 parts of polyester glycol, 20-30 parts of tackifying resin, 10-20 parts of polyfunctional silyl-terminated polyether resin, 12-15 parts of diisocyanate, 3-5 parts of end-capping agent, 0.1-0.3 part of catalyst and 0.03-0.05 part of viscosity stabilizer;
(2) adding selected polyether diol, polyester diol and tackifying resin into a reaction kettle, heating to 120-140 ℃, and melting, stirring and mixing uniformly;
(3) vacuumizing, and dehydrating under the condition that the vacuum degree is less than 100Pa until the moisture content is less than 300 ppm;
(4) cooling to 80-90 ℃, adding diisocyanate, and stirring and reacting for 30-40min under the conditions that the vacuum degree is less than 100Pa and the temperature is 115-125 ℃;
(5) cooling to 90-110 ℃, adding a capping agent, and stirring and reacting for 1h under the conditions that the vacuum degree is less than 100Pa and the temperature is 115-125 ℃;
(6) adding multifunctional silane-terminated polyether resin, viscosity stabilizer and catalyst, and stirring to react at 115-125 deg.C under vacuum degree of less than 100Pa for 10-15 min;
(7) rapidly discharging under nitrogen protection, and packaging in aluminum foil bags;
in the raw materials, the functionality of the multifunctional end-silane polyether resin is 6, and the viscosity of the multifunctional end-silane polyether resin is 5000-30000 cps.
2. The process for preparing reactive polyurethane hot melt adhesive according to claim 1, wherein: the multifunctional silane-terminated polyether resin has the trademark of Kerilon 201T.
3. The preparation method of the reactive polyurethane hot melt adhesive according to claim 1, characterized in that: the grade of the polyether glycol is selected from PPG1000 or PPG2000 taking propylene oxide as an initiator, or PTMEG1000 or PTMEG2000 taking tetrahydrofuran as an initiator; the grade of the polyester diol is selected from one of PBA3000, PHA3500, amorphous polyester diol 7130 with molecular weight of 3000, or phthalic anhydride polyester diol R-2370 with molecular weight of 3500.
4. The method for preparing a reactive polyurethane hot melt adhesive according to claim 3, wherein: the tackifying resin can be one of acrylic resin, petroleum resin or polyurethane resin.
5. The process for preparing reactive polyurethane hot melt adhesive according to claim 4, wherein: the molecular weight of the acrylic resin is 20000-50000, and the Tg temperature is 50-80 ℃.
6. The process for preparing reactive polyurethane hot melt adhesive according to claim 4, wherein: the softening point of the petroleum resin is between 100 ℃ and 140 ℃, and the petroleum resin is selected from one of C5 resin, C9 resin or C5 and C9 copolymerized resin.
7. The process for preparing reactive polyurethane hot melt adhesive according to claim 4, wherein: the polyurethane resin is polyether-based TPU resin, and the melting point of the polyurethane resin is between 50 and 100 ℃.
8. The process for preparing a reactive polyurethane hot melt adhesive according to claim 3, wherein: the diisocyanate is diphenylmethane diisocyanate; the viscosity stabilizer is one of phosphoric acid, paratoluenesulfonic acid isocyanate, benzoyl chloride and vinyl trimethoxy silane; the end-capping agent is a silane coupling agent; the catalyst is selected from one of dibutyltin dilaurate, stannous octoate, triethylamine and dimorpholinyl diethyl ether.
9. The process for preparing a reactive polyurethane hot melt adhesive according to claim 8, wherein: the silane coupling agent is selected from one of gamma-aminopropyltriethoxysilane, gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, gamma-mercaptopropyltriethoxysilane and gamma-mercaptopropyltrimethoxysilane.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115572566A (en) * | 2022-09-08 | 2023-01-06 | 东莞市佳迪新材料有限公司 | Single-component silane modified hot melt adhesive for bonding vehicle-mounted display screen and preparation method thereof |
| WO2024009958A1 (en) * | 2022-07-04 | 2024-01-11 | 積水化学工業株式会社 | Reactive hot melt resin composition, cured product, use of reactive hot melt resin composition, and end face protection method |
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| CN102816549A (en) * | 2012-07-10 | 2012-12-12 | 华南理工大学 | Silyl-terminated polyether modified polyurethane adhesive, its preparation method and application thereof |
| CN107163898A (en) * | 2017-05-19 | 2017-09-15 | 天永诚高分子材料（常州）有限公司 | A kind of preparation method of high temperature resistant type damp solidifying polyurethane PUR |
| CN108251040A (en) * | 2017-12-29 | 2018-07-06 | 美瑞新材料股份有限公司 | A kind of low-surface-energy moisture-curable polyurethane hot melt adhesive and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102816549A (en) * | 2012-07-10 | 2012-12-12 | 华南理工大学 | Silyl-terminated polyether modified polyurethane adhesive, its preparation method and application thereof |
| CN107163898A (en) * | 2017-05-19 | 2017-09-15 | 天永诚高分子材料（常州）有限公司 | A kind of preparation method of high temperature resistant type damp solidifying polyurethane PUR |
| CN108251040A (en) * | 2017-12-29 | 2018-07-06 | 美瑞新材料股份有限公司 | A kind of low-surface-energy moisture-curable polyurethane hot melt adhesive and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024009958A1 (en) * | 2022-07-04 | 2024-01-11 | 積水化学工業株式会社 | Reactive hot melt resin composition, cured product, use of reactive hot melt resin composition, and end face protection method |
| CN115572566A (en) * | 2022-09-08 | 2023-01-06 | 东莞市佳迪新材料有限公司 | Single-component silane modified hot melt adhesive for bonding vehicle-mounted display screen and preparation method thereof |
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