CN111808552A - Multipurpose reactive hot melt adhesive and preparation method thereof - Google Patents
Multipurpose reactive hot melt adhesive and preparation method thereof Download PDFInfo
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- CN111808552A CN111808552A CN202010649835.5A CN202010649835A CN111808552A CN 111808552 A CN111808552 A CN 111808552A CN 202010649835 A CN202010649835 A CN 202010649835A CN 111808552 A CN111808552 A CN 111808552A
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- Prior art keywords
- hot melt
- melt adhesive
- multipurpose
- reactive hot
- polyolefin resin
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- Pending
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- 239000004831 Hot glue Substances 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title description 2
- 229920005672 polyolefin resin Polymers 0.000 claims abstract description 16
- 229920001112 grafted polyolefin Polymers 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 229920005989 resin Polymers 0.000 claims abstract description 12
- 239000011347 resin Substances 0.000 claims abstract description 12
- 229920000642 polymer Polymers 0.000 claims abstract description 11
- 229920000098 polyolefin Polymers 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 37
- 238000003756 stirring Methods 0.000 claims description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims description 16
- 238000011049 filling Methods 0.000 claims description 13
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 12
- 230000002378 acidificating effect Effects 0.000 claims description 12
- 229910000077 silane Inorganic materials 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 239000002131 composite material Substances 0.000 abstract description 13
- 239000000463 material Substances 0.000 abstract description 11
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 abstract description 8
- 239000012975 dibutyltin dilaurate Substances 0.000 abstract description 8
- 239000002023 wood Substances 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 abstract description 3
- 239000004698 Polyethylene Substances 0.000 abstract description 3
- 239000004743 Polypropylene Substances 0.000 abstract description 3
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 abstract description 3
- 239000004715 ethylene vinyl alcohol Substances 0.000 abstract description 3
- 239000011521 glass Substances 0.000 abstract description 3
- 239000002253 acid Substances 0.000 abstract description 2
- 238000013329 compounding Methods 0.000 abstract description 2
- 238000010030 laminating Methods 0.000 abstract description 2
- 238000003878 thermal aging Methods 0.000 abstract description 2
- 239000002904 solvent Substances 0.000 abstract 1
- 238000004132 cross linking Methods 0.000 description 8
- 230000001070 adhesive effect Effects 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 238000004806 packaging method and process Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 229920001587 Wood-plastic composite Polymers 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002905 metal composite material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 125000005373 siloxane group Chemical group [SiH2](O*)* 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000011155 wood-plastic composite Substances 0.000 description 2
- 229920003354 Modic® Polymers 0.000 description 1
- 239000007977 PBT buffer Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229910002808 Si–O–Si Inorganic materials 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012994 photoredox catalyst Substances 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000758 substrate 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
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J123/26—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers modified by chemical after-treatment
-
- 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
- C09J151/00—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
- C09J151/06—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to a multipurpose reactive hot melt adhesive and a manufacturing method thereof. The purpose is to provide a multipurpose reactive hot melt adhesive and a manufacturing method thereof, wherein the reactive hot melt adhesive has excellent bonding performance; the composite material can be used for laminating, heating and compounding various materials such as PE, PP, EVOH, PA, PS, PET, PBT, PC, PVC, wood, metal, glass and the like; the performance of the material in a high-temperature environment is obviously improved, and the finished product has better thermal aging resistance and creep resistance. The technical scheme is as follows: a multipurpose reactive hot melt adhesive comprises the following components in parts by weight: silane-grafted crosslinkable polyolefin resin: 20-30 parts of a solvent; acid substance-grafted polyolefin resin: 20-50 parts; polyhydroxy polyolefin polymer: 20-40 parts; dibutyltin dilaurate: 0.5 to 1.5 portions.
Description
Technical Field
The invention relates to a multipurpose reactive hot melt adhesive and a manufacturing method thereof.
Background
The main direction of the development of the plastic alloy material technology in the world is light weight and environmental protection, and a large amount of plastic metal composite technology is used for manufacturing multilayer boards, including food packaging aluminum-plastic composite bags, aluminum honeycomb boards, wood-plastic composites, aluminum-wood composites and other multiple material composite bonding; a plurality of material composite processes are widely applied in industrial production, but the current really applicable adhesive has few effects and poor effect, and the layers are easy to loosen and peel after long-term use. The composite materials used in each plant are different from each other in types such as PE, PP, EVOH, PA, PS, PET, PBT, PC, wood, metal, glass and the like.
Because the varieties of plastic alloys selected by various composite manufacturers are different, a multipurpose reactive hot melt adhesive with good bonding effect is more needed in the field.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a multipurpose reactive hot melt adhesive and a manufacturing method thereof, wherein the reactive hot melt adhesive has excellent bonding performance; the composite material can be used for laminating, heating and compounding various materials such as PE, PP, EVOH, PA, PS, PET, PBT, PC, PVC, wood, metal, glass and the like; the performance of the material in a high-temperature environment is obviously improved, and the finished product has better thermal aging resistance and creep resistance.
The technical scheme provided by the invention is as follows:
a multipurpose reactive hot melt adhesive comprises the following components in parts by weight:
a multipurpose reactive hot melt adhesive comprises the following components in parts by weight:
the manufacturing method of the multipurpose reactive hot melt adhesive comprises the following steps:
the first step is as follows: firstly, heating the temperature of a reaction kettle to 100-110 ℃, then adding a polyhydroxy polyolefin polymer, filling nitrogen for protection and stirring, wherein the stirring time is 20 +/-2 minutes;
the second step is that: adding acidic substance grafted polyolefin resin, and filling nitrogen to protect, stir and melt for 30 +/-3 minutes;
the third step: heating the temperature of the reaction kettle to 190-200 ℃, adding silane grafted crosslinkable polyolefin resin, filling nitrogen for protection, stirring and melting for 90 +/-5 minutes; then closing the nitrogen gas to carry out vacuum pumping and stirring for 25 +/-2 minutes, wherein the vacuum degree is less than the atmospheric pressure of 0.07-0.09 MPa; vacuumizing, charging nitrogen again for protection, discharging and barreling; a 3-layer sealed pouch or sealed-layer tub package that can absolutely exclude moisture was selected.
The multipurpose reactive hot melt adhesive product obtained by the invention can be mainly used for manufacturing multilayer boards by a plastic metal composite process through a conventional sealing hot melt adhesive machine or hot melt adhesive rolling equipment, an online gluing composite equipment and the like, and comprises a circuit printed circuit board, a food packaging aluminum-plastic composite bag, an aluminum honeycomb board, a wood-plastic composite, a metal and wood composite and other multiple materials for composite bonding.
The reaction mechanism of the multipurpose reactive hot melt adhesive is as follows: the moisture in the air can chemically react with the siloxane groups to be cured and generate a small amount of methanol, finally a stable three-dimensional network structure of Si-O-Si bonds is formed, the dibutyltin dilaurate can accelerate the curing reaction, and the curing speed depends on various factors, such as the capability of water to diffuse from the surface to the siloxane groups, the water content of the substrate, the curing temperature and thickness of the adhesive and the dosage of the catalyst (if sufficient moisture exists and the temperature is 23 ℃, the highest strength can be achieved after 144 hours).
The technical indexes of the product obtained by the invention after inspection are as follows:
the invention has the beneficial effects that:
the invention has the characteristics of excellent bonding performance, simple process, convenient manufacture and use and wide range of bonding materials, is suitable for bonding manufacture of multi-layer plates of most materials on the market, can obviously improve the performance of the materials in a high-temperature environment, and ensures that the finished products have better heat aging resistance and creep resistance.
Detailed Description
The method takes polyolefin resin of silane grafting cross-linking reaction, acidic substance grafting polyolefin resin, polyhydroxy polyolefin polymer and dibutyltin dilaurate as raw materials, carries out melting and stirring uniformly under the protection of multiple nitrogen, and packages by an air isolation packaging bag of a release coating; in the manufacturing process, the bonding strength of the product can be adjusted by the proportion of polyolefin resin of silane grafting and crosslinking reaction, and the curing time and speed are adjusted by the proportion of dibutyltin dilaurate; the acidic substance grafted polyolefin resin and the polyhydroxy polyolefin polymer have the adhesive property to most products in the formula, and the viscosity of the adhesive is reduced; the more the acid substance grafted polyolefin resin is, the greater the bonding strength to various materials is, the properties of the polyhydroxy polyolefin polymer such as adhesiveness, flexibility, lubricity, dispersibility and the like can be improved, the melt viscosity of the adhesive is reduced, and the reaction of each component is carried out by utilizing the hydroxyl at the tail end, so that the product is more firmly crosslinked and cured at the later stage of composite bonding.
Thus, the formulations of the present invention comprise: 20-30 parts of polyolefin resin subjected to silane grafting and crosslinking reaction, 20-50 parts of acidic substance grafted polyolefin resin, 20-40 parts of polyhydroxy polyolefin polymer and 0.5-1.5 parts of dibutyltin dilaurate.
The silane-grafted cross-linkable polyolefin resin is available from mitsubishi company Linklon brand SS 703N;
the acidic substance-grafted polyolefin resin is available from Mitsubishi corporation of Japan under MODIC brand number Z041F;
the polyhydroxy polyolefin polymer was purchased from Mitsubishi, PolyTAIL brand H.
The invention provides a method for preparing a multipurpose reactive hot melt adhesive, which comprises the following steps:
firstly, heating the temperature of a reaction kettle to 110 ℃ below zero and 100 ℃, then adding a polyhydroxy polyolefin polymer, filling nitrogen for protection and stirring, wherein the stirring time is 20 +/-2 minutes;
secondly, adding acidic substance grafted polyolefin resin, filling nitrogen to protect, stirring and melting for 30 +/-3 minutes;
thirdly, raising the temperature of the reaction kettle to 190-200 ℃, adding silane grafted crosslinkable polyolefin resin, and filling nitrogen to protect, stir and melt for 90 +/-5 minutes; then closing the nitrogen gas to carry out vacuum pumping and stirring, wherein the vacuum pumping time is 25 +/-2 minutes, and the vacuum degree is less than the atmospheric pressure of 0.07Mpa to 0.09 Mpa; and vacuumizing, then filling nitrogen for protection, discharging and barreling, and selecting a 3-layer separation type sealing bag or a barrel package with a separation type sealing layer which can absolutely isolate moisture.
The present invention is further illustrated by the following examples.
The data in the table are in parts by weight.
The manufacturing method of the above 5 embodiments is: firstly, heating the temperature of a reaction kettle to 110 ℃ below zero, then adding a polyhydroxy polyolefin polymer, introducing nitrogen for protection and stirring, wherein the stirring time is 20 +/-2 minutes; secondly, adding an acidic substance grafted polyolefin resin, filling nitrogen for protection, stirring and melting for 30 +/-3 minutes; thirdly, heating the temperature of the reaction kettle to 190-200 ℃, adding silane grafted crosslinkable polyolefin resin, filling nitrogen for protection, stirring and melting for 90 minutes; and then closing nitrogen gas, vacuumizing and stirring for 25 +/-2 minutes, wherein the vacuum degree is less than the atmospheric pressure of 0.07-0.09 Mpa, vacuumizing, then filling nitrogen gas for protection, discharging and barreling, and selecting a 3-layer separation type sealing bag or a barrel with a separation type sealing layer which can absolutely isolate moisture and packaging.
Product index
The test results for the five examples above are as follows:
example 1: the polyolefin resin content of the silane grafting cross-linking reaction is small, and the shear strength is small.
Example 2: the content of polyolefin resin in silane grafting and crosslinking reaction is increased, and the content of polyolefin resin grafted by acidic substances is reduced; the peel strength and the shear strength are increased, and the technical requirements are basically met.
Example 3: the content of polyolefin resin of silane grafting cross-linking reaction is increased; the amount of the acidic substance grafted polyolefin resin is not changed; and the dibutyltin dilaurate is increased, so that the stripping force is obviously increased, the shear strength is also obviously increased, and the technical requirements are met.
Example 4: the content of polyolefin resin of silane grafting cross-linking reaction is continuously increased; the amount of the acidic substance grafted polyolefin resin is increased, the amount of dibutyltin dilaurate is reduced, the peeling force is continuously increased, the shear strength is reduced, the adhesive strength is increased, and the requirements are basically met.
Example 5: the content of polyolefin resin of silane grafting cross-linking reaction is continuously increased; the amount of the acidic substance grafted polyolefin resin increases; the amount of the polyhydroxy polyolefin polymer is reduced, the amount of dibutyltin dilaurate is reduced, the peel strength is basically unchanged, the shear strength is basically unchanged, and the viscosity is obviously increased, so that the technical requirements cannot be met.
Effect of cure time for 5 examples on peel and shear Strength of the product
(1)24 hours
(2)48 hours
(3)72 hours
(4)96 hours
(5)120 hours
(6)144 hours
(7)168 hours
The curing time of the above 5 embodiments clearly shows that the performance of the reactive hot melt adhesive can reach the strongest level after 144 hours of construction adhesion through the test data of 7 time periods for the peel strength and the shear strength of the product.
The products obtained by combining the above examples 2 to 3 have more ideal effects.
The above examples are merely illustrative for clarity and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (3)
3. the multipurpose reactive hot melt adhesive according to claim 1 or 2, wherein: the manufacturing method of the multipurpose reactive hot melt adhesive comprises the following steps:
the first step is as follows: firstly, heating the temperature of a reaction kettle to 100-110 ℃, then adding a polyhydroxy polyolefin polymer, filling nitrogen for protection and stirring, wherein the stirring time is 20 +/-2 minutes;
the second step is that: adding acidic substance grafted polyolefin resin, and filling nitrogen to protect, stir and melt for 30 +/-3 minutes;
the third step: heating the temperature of the reaction kettle to 190-200 ℃, adding silane grafted crosslinkable polyolefin resin, filling nitrogen for protection, stirring and melting for 90 +/-5 minutes; then closing the nitrogen gas to carry out vacuum pumping and stirring for 25 +/-2 minutes, wherein the vacuum degree is less than the atmospheric pressure of 0.07-0.09 MPa; vacuumizing, charging nitrogen again for protection, discharging and barreling; a 3-layer sealed pouch or sealed-layer tub package that can absolutely exclude moisture was selected.
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CN202010649835.5A CN111808552A (en) | 2020-07-08 | 2020-07-08 | Multipurpose reactive hot melt adhesive and preparation method thereof |
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CN202010649835.5A CN111808552A (en) | 2020-07-08 | 2020-07-08 | Multipurpose reactive hot melt adhesive and preparation method thereof |
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CN202010649835.5A Pending CN111808552A (en) | 2020-07-08 | 2020-07-08 | Multipurpose reactive hot melt adhesive and preparation method thereof |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112358833A (en) * | 2020-11-09 | 2021-02-12 | 吴文静 | Reactive hot melt adhesive raw material and preparation method thereof |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004176028A (en) * | 2002-11-27 | 2004-06-24 | Hitachi Kasei Polymer Co Ltd | Reactive hot melt adhesive composition |
CN101248099A (en) * | 2005-07-11 | 2008-08-20 | 陶氏环球技术公司 | Silane-grafted olefin polymers, compositions and articles prepared therefrom, and methods for making the same |
CN102906125A (en) * | 2010-05-26 | 2013-01-30 | 出光兴产株式会社 | Terminally unsaturated polyolefin and process for producing the same |
-
2020
- 2020-07-08 CN CN202010649835.5A patent/CN111808552A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004176028A (en) * | 2002-11-27 | 2004-06-24 | Hitachi Kasei Polymer Co Ltd | Reactive hot melt adhesive composition |
CN101248099A (en) * | 2005-07-11 | 2008-08-20 | 陶氏环球技术公司 | Silane-grafted olefin polymers, compositions and articles prepared therefrom, and methods for making the same |
CN102906125A (en) * | 2010-05-26 | 2013-01-30 | 出光兴产株式会社 | Terminally unsaturated polyolefin and process for producing the same |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112358833A (en) * | 2020-11-09 | 2021-02-12 | 吴文静 | Reactive hot melt adhesive raw material and preparation method thereof |
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