CN115873550A - Liquid polyurethane adhesive and preparation method thereof - Google Patents
Liquid polyurethane adhesive and preparation method thereof Download PDFInfo
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- CN115873550A CN115873550A CN202211718176.1A CN202211718176A CN115873550A CN 115873550 A CN115873550 A CN 115873550A CN 202211718176 A CN202211718176 A CN 202211718176A CN 115873550 A CN115873550 A CN 115873550A
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- 239000000853 adhesive Substances 0.000 title claims abstract description 49
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 49
- 239000007788 liquid Substances 0.000 title claims abstract description 42
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 42
- 239000004814 polyurethane Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000011347 resin Substances 0.000 claims abstract description 29
- 229920005989 resin Polymers 0.000 claims abstract description 29
- 229920005906 polyester polyol Polymers 0.000 claims abstract description 23
- 239000012948 isocyanate Substances 0.000 claims abstract description 19
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 19
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 18
- 239000003054 catalyst Substances 0.000 claims abstract description 18
- 229920000570 polyether Polymers 0.000 claims abstract description 18
- 229920005862 polyol Polymers 0.000 claims abstract description 18
- 150000003077 polyols Chemical class 0.000 claims abstract description 18
- 239000004970 Chain extender Substances 0.000 claims abstract description 17
- 239000007822 coupling agent Substances 0.000 claims abstract description 16
- 239000000945 filler Substances 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims description 22
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 14
- 239000012295 chemical reaction liquid Substances 0.000 claims description 12
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 9
- 239000003963 antioxidant agent Substances 0.000 claims description 7
- 230000003078 antioxidant effect Effects 0.000 claims description 7
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 7
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims description 6
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 claims description 6
- 230000035484 reaction time Effects 0.000 claims description 6
- 239000003784 tall oil Substances 0.000 claims description 6
- 150000003505 terpenes Chemical class 0.000 claims description 6
- 235000007586 terpenes Nutrition 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- 239000006229 carbon black Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- -1 poly (adipic acid-1,5-pentanediol ester diol Chemical class 0.000 claims description 4
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 3
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 2
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 claims description 2
- 229920001223 polyethylene glycol Polymers 0.000 claims description 2
- 239000004831 Hot glue Substances 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 238000013008 moisture curing Methods 0.000 abstract description 2
- 238000003786 synthesis reaction Methods 0.000 abstract description 2
- 229920001971 elastomer Polymers 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000005060 rubber Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 description 2
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-L adipate(2-) Chemical compound [O-]C(=O)CCCCC([O-])=O WNLRTRBMVRJNCN-UHFFFAOYSA-L 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000012975 dibutyltin dilaurate Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 108010020346 Polyglutamic Acid Proteins 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- YAHBZWSDRFSFOO-UHFFFAOYSA-L dimethyltin(2+);2-(2-ethylhexoxy)-2-oxoethanethiolate Chemical compound CCCCC(CC)COC(=O)CS[Sn](C)(C)SCC(=O)OCC(CC)CCCC YAHBZWSDRFSFOO-UHFFFAOYSA-L 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920002643 polyglutamic acid Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002987 primer (paints) Substances 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 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 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N urethane group Chemical group NC(=O)OCC JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 238000009461 vacuum packaging Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Abstract
The invention provides a liquid polyurethane adhesive and a preparation method thereof, and relates to the technical field of adhesives. Specifically, the liquid polyurethane adhesive is prepared from the following components: polyester polyol, polyether polyol, isocyanate, tackifying resin, a chain extender, a catalyst, a coupling agent and a filler. The moisture-curing liquid polyurethane adhesive provided by the invention overcomes the technical defect that the conventional polyurethane hot melt adhesive needs to be heated and used at 100-200 ℃; by optimizing the raw material components and the synthesis process, the adhesive which can be directly used at normal temperature without heating is obtained, and meanwhile, the adhesive has high bonding strength, mechanical properties and weather resistance and has wide application prospects.
Description
Technical Field
The invention relates to the technical field of adhesives, and particularly relates to a liquid polyurethane adhesive and a preparation method thereof.
Background
Polyurethane adhesives refer to adhesives containing urethane groups (-NHCOO-) or isocyanate groups (-NCO) in molecular chains, have excellent chemical bonding force with substrates containing active hydrogen, such as porous materials like foam, plastics, wood, leather, fabrics, paper, ceramics and the like, and materials with smooth surfaces such as metal, glass, rubber, plastics and the like, and have quite wide application in the market and various industries.
The conventional polyurethane adhesives sold in the market at present are hot-melt adhesives, such as hot-melt adhesive particles, hot-melt adhesive blocks, hot-melt adhesives and the like, and all need to be heated at high temperature (100-200 ℃), so that the application of the adhesives is limited to a certain extent. Meanwhile, the conventional polyurethane adhesive generally has the problems of insufficient initial adhesion, glue rebounding, easy dislocation, rubber wires in drawn wires, thin rubber wires, no temperature resistance, no water resistance, easy skinning, poor stability, difficult odor repair and the like. With the widespread use of polyurethane adhesives, these problems are urgently solved.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The first objective of the present invention is to provide a liquid polyurethane adhesive, which is used to solve the technical defect that the conventional polyurethane adhesive needs to be heated at a higher temperature for use, and has good adhesive strength and mechanical properties.
The second purpose of the present invention is to provide a preparation method of the liquid polyurethane adhesive, which is simple and easy to implement and easy for mass production.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the liquid polyurethane adhesive is prepared from the following components: polyester polyol, polyether polyol, isocyanate, tackifying resin, a chain extender, a catalyst, a coupling agent and a filler.
Preferably, the polyester polyol comprises a poly adipic acid-1,5-pentanediol ester diol; the number average molecular weight of the polyester polyol is 1000-4000.
Preferably, the polyether polyol comprises at least one of a propylene oxide ether glycol, an ethylene oxide ether glycol, or a polyethylene glycol ether; the polyether polyol has a number average molecular weight of 1000 to 4000.
Preferably, the isocyanate comprises 4,4' diphenylmethane diisocyanate.
Preferably, the tackifying resin comprises at least one of a liquid terpene resin and a liquid rosin resin.
Preferably, the chain extender comprises 1,4-butanediol.
Preferably, the catalyst comprises an organotin catalyst; more preferably, the catalyst comprises at least one of dibutyltin dilaurate, stannous octoate, or methyl tin mercaptide.
Preferably, the coupling agent comprises a silane-based coupling agent; more preferably, the coupling agent includes at least one of gamma-methacryloxypropyltrimethoxysilane, gamma-glycidoxypropyltrimethoxysilane, and gamma-methacryloxypropyltrimethoxysilane.
Preferably, the filler comprises at least one of carbon black, white carbon or nano calcium carbonate.
Preferably, the water content of each raw material component of the liquid polyurethane adhesive is less than 1g/kg.
Preferably, the composition is prepared from the following components in parts by weight: 100 to 200 portions of polyester polyol, 50 to 100 portions of polyether polyol, 50 to 100 portions of isocyanate, 50 to 100 portions of tackifying resin, 0.5 to 3 portions of chain extender, 0.5 to 5 portions of catalyst, 0.5 to 5 portions of coupling agent and 0.5 to 10 portions of filler.
Preferably, the molar ratio of the polyester polyol, the polyether polyol, the isocyanate, the tackifying resin and the chain extender is 1: (0.1-0.5): (1-10): (0.1-0.5): (0.1-1).
Preferably, the liquid polyurethane adhesive further comprises the following raw material components: an antioxidant; more preferably, the antioxidant comprises at least one of antioxidant 1010 and antioxidant 1076.
The preparation method of the liquid polyurethane adhesive comprises the following steps: step one, fully mixing polyester polyol and polyether polyol; adding isocyanate and a catalyst into the reaction liquid obtained in the step one to react; step three, adding a chain extender and a coupling agent into the reaction liquid obtained in the step two for reaction; step four, adding tackifying resin and isocyanate into the reaction liquid obtained in the step three for reaction; and step five, adding a filler into the reaction liquid obtained in the step four for reaction, and obtaining the liquid polyurethane adhesive after full reaction.
Preferably, after the step one, the method further comprises the following steps: and carrying out vacuum dehydration treatment.
Preferably, in the second step, the third step and the fourth step, the reaction is carried out in a vacuum state after the feeding.
Preferably, in the second step, the reaction temperature is 60-80 ℃ and the reaction time is 30-60 min.
Preferably, in the third step, the reaction temperature is 80-90 ℃ and the reaction time is 30-60 min.
Preferably, in the fourth step, the reaction temperature is 80-90 ℃ and the reaction time is 1.5-3 h.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a moisture-curing liquid polyurethane adhesive, which can be directly used at normal temperature without heating by optimizing raw material components and a synthesis process, has high bonding strength and weather resistance, has smaller viscosity at 25 ℃ and is beneficial to application.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following detailed description, but those skilled in the art will understand that the following described examples are some, not all, of the examples of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. 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 examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The invention is carried out by the following specific embodiments: a liquid polyurethane adhesive comprises main materials: polyester polyol, polyether polyol, isocyanate, tackifying resin, a chain extender and auxiliary materials: a catalyst, a coupling agent, a filler and optionally an antioxidant.
As a preferred embodiment, the weight parts of each raw material component include but are not limited to: polyester polyols 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200 (parts), polyether polyols 50, 60, 70, 80, 90, 100 (parts), isocyanates 50, 60, 70, 80, 90, 100 (parts), tackifying resins 50, 60, 70, 80, 90, 100 (parts), chain extenders 0.5, 1.0, 1.5, 2.0, 2.5, 3 (parts), catalysts 0.5, 1.0, 1.5, 2.0, 2.5, 3, 3.5, 4, 4.5, 5 (parts), coupling agents 0.5, 1.0, 1.5, 2.0, 2.5, 3, 3.5, 4, 4.5, 5 (parts), fillers 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 (parts). It should be noted that the weight portions can be selected from the above listed point values, and any real value in the value interval composed of the above point values can be adopted.
As a preferred embodiment, the molar ratio of the polyester polyol, the polyether polyol, the isocyanate, the tackifying resin and the chain extender is 1: (0.1-0.5): (1-10): (0.1-0.5): (0.1 to 1); as a more preferred embodiment, the molar ratio is 1: (0.1-0.5): (2-6): (0.2-0.4): (0.2-0.8).
As a preferred embodiment, the weight parts of the catalyst, the coupling agent, the filler and the antioxidant in the auxiliary material independently do not exceed 5 parts, based on 100 parts of the weight parts of the main material, i.e. 100 parts of the total weight parts of the polyester polyol, the polyether polyol, the isocyanate, the tackifying resin and the chain extender; as a more preferred embodiment, the parts by weight of catalyst, coupling agent, filler and antioxidant in the adjuvant independently do not exceed 3 parts.
As a preferred embodiment, the polyester polyol includes a first polyester polyol having a molecular weight of 2000, and a second polyester polyol having a molecular weight of 3000; and the molar ratio of the first polyester polyol to the second polyester polyol is 1: (0.5-1).
As a preferred embodiment, the tackifying resin comprises both a liquid terpene resin and a liquid rosin resin, and the molar ratio of the liquid terpene resin to the liquid rosin resin is 1: (0.1-0.5).
As a preferred embodiment, the water content of each raw material component of the liquid polyurethane adhesive is less than 1g/kg; those skilled in the art can directly purchase the raw material meeting the defined condition, or pre-treat the raw material to reduce the water content to the defined condition, such as electric heating, vacuum heating, etc.
The preparation method of the liquid polyurethane adhesive comprises the following steps: step one, fully mixing polyester polyol and polyether polyol; adding isocyanate and a catalyst into the reaction liquid obtained in the step one to react; step three, adding a chain extender and a coupling agent into the reaction liquid obtained in the step two for reaction; step four, adding tackifying resin and isocyanate into the reaction liquid obtained in the step three for reaction; and step five, adding a filler into the reaction liquid obtained in the step four for reaction, and obtaining the liquid polyurethane adhesive after full reaction.
The application method of the liquid polyurethane adhesive comprises the following steps: after the liquid polyurethane adhesive is installed on a glue dispenser, the operation is carried out under the condition of no heating; that is, the liquid polyurethane adhesive of the present invention does not require a heating operation when it is used.
Example 1
(1) 125g of poly (glutaric adipate) glycol with the molecular weight of 2000, 50g of poly (glutaric adipate) glycol with the molecular weight of 3000 and 75g of low-unsaturation propylene oxide glycol with the molecular weight of 2000 are weighed and added into a three-neck flask provided with an electric stirrer and a thermometer for fully stirring and mixing, and then vacuum dehydration is carried out for 2h at the temperature of 110 ℃.
(2) The temperature is reduced to 50 ℃, 15.6g of 4,4' diphenylmethane diisocyanate and 2.5g of dibutyltin dilaurate as a catalyst are added, the vacuum pumping is started, and then the reaction is carried out for 30min.
(3) And releasing the vacuum, adding 1.4g of chain extender 1,4-butanediol and 3242 g of silane coupling agent KH-5603.0, starting the vacuum pumping, and then reacting for 30min at 80 ℃.
(4) The vacuum is released, 50g of liquid terpene resin, 20g of liquid rosin resin and 59.25g of 4,4' diphenylmethane diisocyanate are added, the vacuum is started, and then the reaction is carried out for 2 hours at the temperature of 80 ℃.
(5) And releasing the vacuum, adding 5g of carbon black, continuously stirring for 30min, quickly discharging, and vacuum-packaging in an aluminum foil bag for later use.
Example 2
Essentially the same as example 1, except that:
in step (1), 75g of a 2000 molecular weight polyglutamic acid pentanediol diol and 125g of a 2000 molecular weight low unsaturation propylene oxide ether diol were used.
Example 3
Essentially the same as example 2, except that:
in the step (4), the amount of the liquid rosin resin was 50g.
Example 4
Essentially the same as example 3, except that:
in step (2), 4,4' diphenylmethane diisocyanate was 30.5g.
Example 5
Essentially the same as example 1, except that:
in step (2), 4,4' diphenylmethane diisocyanate was 30.5g; in the step (4), the amount of the liquid terpene resin was 20g.
Comparative example 1: a conventional liquid polyurethane adhesive is commercially available as SMF6835.
Comparative example 2: conventional liquid polyurethane adhesive THK3007 is commercially available.
Test examples
The liquid polyurethane adhesives obtained in examples 1 to 5 and comparative examples 1 to 2 were subjected to the following performance tests.
(1) Melt viscosity: tested according to GB/T2794-1995 standard.
(2) Tensile strength and elongation: the tensile strength and elongation at break were recorded as TS0 and EL0, respectively, as measured according to GB/T528-2009 standard.
(3) Weather resistance: preparing a sample according to standard ATSTMD 638; placing the rubber sample in a constant temperature and humidity box with the humidity of 60% and the temperature of 25 ℃ for 72h, and then testing the tensile strength and the elongation at break of the rubber sample according to the method of ASTM D638, wherein the tensile speed is 100mm/min and the testing temperature is 25 ℃; the resulting tensile strength and elongation at break are reported as TS1 and EL1, respectively.
(4) Bonding strength: testing according to the GB/T7124-2008 standard; the PC board without primer coating and surface treatment is bonded, and then the bonded PC board is placed for 24 hours under the environment of temperature (23 +/-2) DEG C and relative humidity (50 +/-5)% RH, and the shear strength is tested.
TABLE 1 test results table
While particular embodiments of the present invention have been illustrated and described, it will be appreciated that the above embodiments are merely illustrative of the technical solution of the present invention and are not restrictive; those of ordinary skill in the art will understand that: modifications may be made to the above-described embodiments, or equivalents may be substituted for some or all of the features thereof without departing from the spirit and scope of the present invention; the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention; it is therefore intended to cover in the appended claims all such alternatives and modifications that are within the scope of the invention.
Claims (10)
1. The liquid polyurethane adhesive is characterized by comprising the following components: polyester polyol, polyether polyol, isocyanate, tackifying resin, a chain extender, a catalyst, a coupling agent and a filler.
2. The liquid polyurethane adhesive of claim 1, wherein the polyester polyol comprises a poly (adipic acid-1,5-pentanediol ester diol);
preferably, the polyester polyol has a number average molecular weight of 1000 to 4000.
3. The liquid polyurethane adhesive of claim 1, wherein the polyether polyol includes at least one of propylene oxide ether glycol, ethylene oxide ether glycol, or polyethylene glycol ether;
preferably, the polyether polyol has a number average molecular weight of 1000 to 4000.
4. The liquid polyurethane adhesive of claim 1, wherein the liquid polyurethane adhesive includes at least one of the following features (a) - (f);
(a) The isocyanate comprises 4,4' diphenylmethane diisocyanate;
(b) The tackifying resin comprises at least one of liquid terpene resin and liquid rosin resin;
(c) The chain extender comprises 1,4-butanediol;
(d) The catalyst comprises an organotin catalyst;
(e) The coupling agent comprises a silane coupling agent;
(f) The filler comprises at least one of carbon black, white carbon black or nano calcium carbonate.
5. The liquid polyurethane adhesive of claim 1, wherein the water content of each raw material component of the liquid polyurethane adhesive is less than 1g/kg.
6. The liquid polyurethane adhesive of claim 1, wherein the adhesive is prepared from the following components in parts by weight:
100 to 200 portions of polyester polyol, 50 to 100 portions of polyether polyol, 50 to 100 portions of isocyanate, 50 to 100 portions of tackifying resin, 0.5 to 3 portions of chain extender, 0.5 to 5 portions of catalyst, 0.5 to 5 portions of coupling agent and 0.5 to 10 portions of filler;
preferably, the molar ratio of the polyester polyol, the polyether polyol, the isocyanate, the tackifying resin and the chain extender is 1: (0.1-0.5): (1-10): (0.1-0.5): (0.1-1).
7. The liquid polyurethane adhesive of claim 1, further comprising the raw material components: an antioxidant;
preferably, the antioxidant comprises at least one of antioxidant 1010 and antioxidant 1076.
8. The method of preparing a liquid polyurethane adhesive according to any one of claims 1 to 7, comprising the steps of:
step one, fully mixing polyester polyol and polyether polyol;
adding isocyanate and a catalyst into the reaction liquid obtained in the step one to react;
step three, adding a chain extender and a coupling agent into the reaction liquid obtained in the step two for reaction;
step four, adding tackifying resin and isocyanate into the reaction liquid obtained in the step three for reaction;
and step five, adding a filler into the reaction liquid obtained in the step four for reaction, and obtaining the liquid polyurethane adhesive after full reaction.
9. The method of claim 8, further comprising the step of: carrying out vacuum dehydration treatment;
preferably, in the second step, the third step and the fourth step, the reaction is carried out in a vacuum state after the feeding.
10. The method for preparing a liquid polyurethane adhesive according to claim 8, wherein in the second step, the reaction temperature is 60 ℃ to 80 ℃ and the reaction time is 30min to 60min;
and/or, in the third step, the reaction temperature is 80-90 ℃, and the reaction time is 30-60 min;
and/or, in the fourth step, the reaction temperature is 80-90 ℃, and the reaction time is 1.5-3 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211718176.1A CN115873550A (en) | 2022-12-29 | 2022-12-29 | Liquid polyurethane adhesive and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211718176.1A CN115873550A (en) | 2022-12-29 | 2022-12-29 | Liquid polyurethane adhesive and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115873550A true CN115873550A (en) | 2023-03-31 |
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| CN202211718176.1A Pending CN115873550A (en) | 2022-12-29 | 2022-12-29 | Liquid polyurethane adhesive and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117089311A (en) * | 2023-06-13 | 2023-11-21 | 东莞市博翔电子材料有限公司 | Conductive waterproof sealant and application thereof in field of electronic components |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106978126A (en) * | 2017-03-21 | 2017-07-25 | 佛山市顺德区巴德富实业有限公司 | A kind of quick-setting single-component polyurethane adhesive of normal temperature and preparation method thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106978126A (en) * | 2017-03-21 | 2017-07-25 | 佛山市顺德区巴德富实业有限公司 | A kind of quick-setting single-component polyurethane adhesive of normal temperature and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117089311A (en) * | 2023-06-13 | 2023-11-21 | 东莞市博翔电子材料有限公司 | Conductive waterproof sealant and application thereof in field of electronic components |
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Application publication date: 20230331 |