CN115160969A - Single-component moisture curing reaction type PUR hot melt adhesive and preparation method thereof - Google Patents
Single-component moisture curing reaction type PUR hot melt adhesive and preparation method thereof Download PDFInfo
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- CN115160969A CN115160969A CN202210883915.6A CN202210883915A CN115160969A CN 115160969 A CN115160969 A CN 115160969A CN 202210883915 A CN202210883915 A CN 202210883915A CN 115160969 A CN115160969 A CN 115160969A
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- melt adhesive
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- molecular sieve
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
Abstract
The invention discloses a single-component moisture-curing reactive PUR hot melt adhesive and a preparation method thereof, wherein the PUR hot melt adhesive comprises the following raw materials in parts by weight: 70-80 parts of polyol, 10-24 parts of isocyanate, 5-20 parts of acrylic resin, 10-25 parts of zeolite molecular sieve and 1-2 parts of catalyst. According to the invention, the selective adsorption function of the zeolite molecular sieve is utilized, so that the material has good defoaming property, and zeolite water in the structure can provide water from the interior of the material to accelerate the curing rate; in addition, the zeolite molecular sieve can be used as a filler to reduce the material cost of the PUR glue.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a single-component moisture-curing reactive PUR hot melt adhesive and a preparation method thereof.
Background
The PUR (Polyurethane Reactive) hot melt adhesive is a common hot melt adhesive, has a good adhesion effect, particularly has a good adhesion effect on substances with large material differences, can be used for adhesion among alloys, wood or plastics, can also be used for adhesion among various parts of electronic products, and is widely applied.
Air bubbles and storage stability are key issues affecting the performance of PUR hot melts. The bubbles are generated mainly in two stages, wherein the first stage is a prepolymer preparation stage for mixing the bubbles, and the second stage is a curing reaction stage, when the PUR hot melt adhesive is cured, R-NCO reacts with moisture in the air to release CO 2 Gas is trapped in the glue layer to form a cellular structure. In particular, one-component PUR hotmeltsThe glue reacts with water during the moisture curing process to form unstable carbamic acid which then decomposes to CO 2 ， CO 2 The bubbles migrate to the inside of the colloid, so that bubbles are generated, and if the bubbles migrate to the surface of the colloid, the contact surface area of the colloid and the substrate is reduced; if the glue layer is too thick or the crystallinity is too strong, CO 2 The gas cannot escape in time, and bubbles exist in the colloid, so that the cohesion of the PUR hot melt adhesive is reduced, and the bonding strength of the adhesive is influenced. On the other hand, the air bubbles often carry trace moisture, so that the stability of the PUR hot melt adhesive is poor, and the service life is shortened.
At present, the defoaming of the PUR hot melt adhesive mainly comprises a raw material pretreatment method, an additive method, a dehydrating agent adding method, a blocking treatment modification method and the like. The end-capping modification method is developed quickly, and the method can prolong the storage period of the PUR hot melt adhesive and improve the bonding strength of the PUR hot melt adhesive. The end-capping modification method mainly comprises the following two modes:
a sealant method: the isocyanic acid radical blocking agent is used to inactivate at normal temperature and can not react with active hydrogen, and under the heating condition, the blocked-NCO is dissociated and recovers the activity, and the curing crosslinking reaction is rapidly carried out. Common isocyanate blocking agents include alcohols, cardanol, croton, sodium bisulfite, and the like.
Latent curing agent method: the latent curing agent reacts with the PUR prepolymer to seal-NCO groups, and when the latent curing agent is heated for use, the latent curing agent can preferentially react with moisture in the air to generate a compound containing active hydrogen, and the compound can continuously react with the PUR prepolymer to improve the crosslinking degree of a system and further improve the bonding effect.
Both of these methods are aimed at by chemical reaction with-NCO, and the sealer method requires control of the processing temperature and has some effect on the cure rate. The latent curing agent reacts with the-NCO group in a closed way, certain requirements are required to be met on process control and the like of the reaction for preparing the PUR adhesive in advance, and the formula and the process are required to be redesigned according to the type and the dosage of the added functional group.
In view of the above, there is a need to improve the existing formula and preparation method of the PUR hot melt adhesive so as to have good defoaming property and reduce the material cost of the PUR hot melt adhesive.
Disclosure of Invention
In view of the above-mentioned drawbacks, the technical problem to be solved by the present invention is to provide a single-component moisture-curable reactive PUR hot melt adhesive and a preparation method thereof, so as to solve the problem of high material cost in the existing defoaming manner of PUR hot melt adhesives.
Therefore, the single-component moisture-curing reactive PUR hot melt adhesive provided by the invention comprises the following raw materials in parts by weight:
70-80 parts of polyol, 10-24 parts of isocyanate, 5-20 parts of acrylic resin, 10-25 parts of zeolite molecular sieve and 1-2 parts of catalyst.
In the above technical solution, preferably, the polyol may be selected from polyester polyol or polyether polyol.
In the above technical solution, preferably, the particle size of the zeolite molecular sieve is less than or equal to 10um.
In the above technical solution, preferably, the catalyst may be any one or a combination of more of triethylene diamine, dibutyltin dilaurate and dimorpholinyl diethyl ether.
In the above technical solution, preferably, the raw materials include, by weight: 70 parts of PBA3000, 20 parts of acrylic resin, 10 parts of isocyanate, 10 parts of zeolite molecular sieve and 1 part of dimorpholinyl diethyl ether.
In the above technical solution, preferably, the raw materials include, by weight: 80 parts of PBA3000, 12 parts of acrylic resin, 14 parts of isocyanate, 10 parts of zeolite molecular sieve and 2 parts of dibutyltin dilaurate.
In the above technical solution, the composition preferably comprises the following raw materials in parts by weight: 78 parts of PHA2000, 5 parts of acrylic resin, 24 parts of isocyanate, 25 parts of zeolite molecular sieve, 1 part of dimorpholinyl diethyl ether and 1 part of dibutyltin dilaurate.
The invention also provides a preparation method of the single-component moisture-curing reactive PUR hot melt adhesive, which comprises the following steps:
putting the zeolite molecular sieve into a forced air drying oven at 90 ℃ and drying for 3-5 hours;
adding polyol and acrylic resin into a three-neck flask, heating to 120 ℃ by using an oil bath kettle, starting a stirring and vacuum pump simultaneously after the polyol is molten, performing reduced pressure dehydration for 2 hours, and then cooling to 60 ℃ for later use, wherein the vacuum degree is more than or equal to 0.09MPa;
adding isocyanate into the pretreated polyol, starting a vacuum pump and a stirrer, controlling the reaction temperature at 80 ℃, maintaining the reaction for 3 hours, then adding a zeolite molecular sieve and a catalyst under the protection of nitrogen, and continuously maintaining the conditions for reaction for 30 minutes to obtain a single-component moisture-curing reactive PUR hot melt adhesive; wherein the vacuum degree is more than or equal to 0.09MPa.
According to the technical scheme, the single-component moisture-curing reactive PUR hot melt adhesive and the preparation method thereof provided by the invention solve the problem of high material cost in a defoaming mode in the prior art. Compared with the prior art, the invention has the following beneficial effects:
the zeolite water in the structure can provide water from the interior of the material to accelerate the curing rate; in addition, the zeolite molecular sieve can also be used as a filler to reduce the material cost of the PUR glue.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
In order to make the technical solution and implementation of the present invention more clearly explained and illustrated, several preferred embodiments for implementing the technical solution of the present invention are described below.
It should be noted that the terms of orientation such as "inside, outside", "front, back" and "left, right" are used herein to describe the usage state of the product as a reference, and obviously, the usage of the corresponding terms of orientation does not limit the protection scope of the present solution.
The invention provides a single-component moisture-curing reactive PUR hot melt adhesive which comprises the following raw materials in parts by weight: 70-80 parts of polyol, 10-24 parts of isocyanate, 5-20 parts of acrylic resin, 10-25 parts of zeolite molecular sieve and 1-2 parts of catalyst.
Wherein the polyol can be selected from polyester polyol (polybutylene adipate, PBA 3000), polyether polyol (polytetrahydrofuran ether glycol, PTMG 2000) or polyester polyol (polyhexamethylene adipate, PHA 3000).
The isocyanate may be diphenylmethane diisocyanate, such as MDI-50 from Nicotiana.
The acrylic resin can be Mitsubishi thermoplastic acrylic resin BR113.
The particle size of the zeolite molecular sieve is less than or equal to 10um.
The catalyst can be selected from triethylene diamine (TEDA), dibutyltin dilaurate (T-12) and dimorpholinyl diethyl ether (DMDEE).
Specifically, the following specific examples can be adopted for the one-component moisture-curable reactive PUR hot melt adhesive provided by the present invention.
The preparation method of the single-component moisture-curing reactive PUR hot melt adhesive comprises the following steps:
step 110, pretreatment of the molecular sieve: and (3) putting a proper amount of zeolite molecular sieve into a forced air drying oven at the temperature of 90 ℃ to be dried for 3-5 hours.
Step 120, polyol pretreatment: adding weighed polyalcohol and acrylic resin into a three-neck flask, heating to 120 ℃ by using an oil bath pan, starting stirring (100 r/min) and a vacuum pump (the vacuum degree is more than or equal to 0.09 MPa) simultaneously to dehydrate under reduced pressure for 2 hours after the polyalcohol is molten, and then cooling to 60 ℃ for later use.
Step 130, preparing a single-component moisture-curing reactive PUR hot melt adhesive: adding isocyanate into the pretreated polyalcohol, starting a vacuum pump (the vacuum degree is more than or equal to 0.09 MPa) and a stirrer (100 r/min), controlling the reaction temperature at 80 ℃, maintaining the conditions for reaction for about 3 hours, then adding a zeolite molecular sieve and a catalyst under the protection of nitrogen, and continuously maintaining the conditions for reaction for 30 minutes to obtain the single-component moisture-curing reactive PUR hot melt adhesive.
The single-component moisture-curing reactive PUR hot melt adhesive provided by the invention is tested as follows:
1. the test method comprises the following steps:
opening time: open time was determined according to HG/T3716-2003.
Melt viscosity (120 ℃): the melt viscosity of the composite was measured at 120 ℃ according to standard HG/T3660-1999.
Size of bubble: heating the hot melt adhesive at 130 ℃, uniformly coating the hot melt adhesive on an aluminum sheet subjected to surface pretreatment by using alcohol with the concentration of 99%, controlling the thickness of the adhesive film to be 2mm, and counting the number of bubbles in unit area after the adhesive film is completely cured. The width of the aluminum sheet is 25mm, the length is 200mm, and the number of bubbles is counted by cutting the adhesive film with the middle position of 10mm x 10mm. The bubbles are small and dense, and can be matched with a magnifying glass and a counter for counting.
Bonding strength: the adhesive strength is expressed by the shear strength, the test method refers to standard GM6432M, a sample to be tested is heated to 130 ℃, two Al sheets are adhered together by an adhesive, and the adhesive surface is 25mm multiplied by 12.5mm; then placing the mixture in a constant temperature and humidity box, and carrying out moisture curing in an environment with 23 ℃ and 50% of relative humidity; then, the tensile shear properties were measured by a universal tester at a tensile speed of 12.7mm/min.
Storage stability: and (3) carrying out vacuum packaging on the sample by using an aluminum foil bag, placing the sample under natural conditions, and testing the change of the shear strength at different placing times.
Comparative example 1 is a conventional single-component moisture-curing reactive PUR hot melt adhesive produced by Dongsheng plastic products, inc. in Shenzhen.
2. The test results were as follows:
according to the PUR hot melt adhesive and the preparation method thereof provided by the invention, the bonding strength reaches more than 0.5MPa after the adhesive is coated for 1 hour, and the bonding strength requirements in the processes of moving, transporting and the like of bonding materials are completely met.
The adhesive strength can be kept after long-term storage for 180 days, and compared with the condition that nitrogen is required to be added for protection when common PUR hot melt adhesive is stored, the production process can be reduced, the production cost is reduced, and the economic benefit is remarkable.
By combining the description of the specific embodiments, compared with the prior art, the PUR hot melt adhesive and the preparation method thereof provided by the invention have the following advantages:
firstly, in the present invention, the zeolite molecular sieve is subjected to a drying pretreatment to reduce the content of self zeolite water, so that when the zeolite molecular sieve is added in a low temperature reaction, the water in the zeolite molecular sieve does not escape to react with the PUR prepolymer, but can absorb the excess water in the system. When the single-component moisture-curing reactive PUR hot melt adhesive is applied, the processing temperature is increased to 120-140 ℃, the moisture in the zeolite molecular sieve escapes along with the increase of the temperature and reacts with R-NCO groups in a system, and the adsorption effect of the surface of the zeolite molecular sieve can absorb CO released by the reaction 2 And the pore diameter is stored in the pore diameter, so that the existence of pores in the colloid is reduced, the physical property of the colloid material is improved, and the bonding strength with a base material is improved.
Secondly, the zeolite molecular sieve is adopted as a stable material with a porous structure, and the zeolite molecular sieve has strong adsorption capacity, and can generate strong preferential adsorption effect on polar, unsaturated and easily polarized molecules due to the fact that the framework of the zeolite molecular sieve contains negative charges, and meanwhile, the zeolite molecular sieve can have strong adsorption effect on water molecules in the air. The various pore channels in the zeolite lattice are all communicated with the outside, so that water can escape or enter through the pore channels along with the change of the outside temperature and humidity, namely the water content of the zeolite can also be changed within a certain range. When the humidity is too high, the zeolite can absorb moisture through countless fine pores on the surface; when the environment is dry, moisture can be released to keep the environment moist.
Thirdly, as the PUR adhesive is cured by moisture, namely, the PUR adhesive is reacted with moisture in the air to form a cured adhesive film, the curing of the adhesive film is a curing process from outside to inside, the moisture entering of the adhesive layer is slow, the final curing speed is slow, the time for reaching the final curing strength is long, and the PUR adhesive is not beneficial to practical application. According to the invention, the zeolite molecular sieve provides water from the interior of the material, so that synchronous internal and external solidification can be realized, the solidification time of the material can be effectively shortened, the initial adhesion strength is improved, the working procedure retention time is shortened, and the working efficiency is improved.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a" \8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The present invention is not limited to the above-mentioned preferred embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
Claims (8)
1. The single-component moisture-curing reactive PUR hot melt adhesive is characterized by comprising the following raw materials in parts by weight: 70-80 parts of polyol, 10-24 parts of isocyanate, 5-20 parts of acrylic resin, 10-25 parts of zeolite molecular sieve and 1-2 parts of catalyst.
2. The one-component moisture-curing reactive PUR hot melt adhesive according to claim 1, wherein the polyol is selected from polyester polyols and polyether polyols.
3. The single-component moisture-curable reactive PUR hot melt adhesive according to claim 1, wherein the zeolite molecular sieve has a particle size of 10 μm or less.
4. The one-component moisture-curable reactive PUR hot melt adhesive according to claim 1, wherein the catalyst is selected from any one or a combination of triethylene diamine, dibutyl tin dilaurate and dimorpholinyl diethyl ether.
5. The single-component moisture-curing reactive PUR hot melt adhesive according to claim 1, which comprises the following raw materials in parts by weight: 70 parts of PBA3000, 20 parts of acrylic resin, 10 parts of isocyanate, 10 parts of zeolite molecular sieve and 1 part of dimorpholinyl diethyl ether.
6. The single-component moisture-curable reactive PUR hot melt adhesive according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 80 parts of PBA3000, 12 parts of acrylic resin, 14 parts of isocyanate, 10 parts of zeolite molecular sieve and 2 parts of dibutyltin dilaurate.
7. The single-component moisture-curable reactive PUR hot melt adhesive according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 78 parts of PHA2000, 5 parts of acrylic resin, 24 parts of isocyanate, 25 parts of zeolite molecular sieve, 1 part of dimorpholinodiethyl ether and 1 part of dibutyltin dilaurate.
8. A process for preparing the one-component moisture-curing reactive PUR hot melt adhesive of claim 1, comprising the steps of:
putting the zeolite molecular sieve into a forced air drying oven at 90 ℃ for drying for 3-5 hours;
adding polyol and acrylic resin into a three-neck flask, heating to 120 ℃ by using an oil bath kettle, starting a stirring and vacuum pump simultaneously after the polyol is molten, performing reduced pressure dehydration for 2 hours, and then cooling to 60 ℃ for later use, wherein the vacuum degree is more than or equal to 0.09MPa;
adding isocyanate into the pretreated polyol, starting a vacuum pump and a stirrer, controlling the reaction temperature at 80 ℃, maintaining the reaction for 3 hours, then adding a zeolite molecular sieve and a catalyst under the protection of nitrogen, and continuously maintaining the conditions for reaction for 30 minutes to obtain a single-component moisture-curing reactive PUR hot melt adhesive;
wherein the vacuum degree is more than or equal to 0.09MPa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210883915.6A CN115160969A (en) | 2022-07-26 | 2022-07-26 | Single-component moisture curing reaction type PUR hot melt adhesive and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210883915.6A CN115160969A (en) | 2022-07-26 | 2022-07-26 | Single-component moisture curing reaction type PUR hot melt adhesive and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009242740A (en) * | 2008-03-31 | 2009-10-22 | Sanyo Chem Ind Ltd | Reactive hot melt adhesive |
| KR20110131717A (en) * | 2010-05-31 | 2011-12-07 | 진도화성주식회사 | Eco-friendly moisture-curing polyurethane resin composition and a method thereof |
| CN108285766A (en) * | 2018-02-05 | 2018-07-17 | 深圳市鑫东邦科技有限公司 | One kind exempting from pressurize PUR hot melt adhesives and preparation method thereof |
| CN114045143A (en) * | 2021-11-23 | 2022-02-15 | 广州市白云化工实业有限公司 | High-transparency reactive polyurethane hot melt adhesive and preparation method thereof |
-
2022
- 2022-07-26 CN CN202210883915.6A patent/CN115160969A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009242740A (en) * | 2008-03-31 | 2009-10-22 | Sanyo Chem Ind Ltd | Reactive hot melt adhesive |
| KR20110131717A (en) * | 2010-05-31 | 2011-12-07 | 진도화성주식회사 | Eco-friendly moisture-curing polyurethane resin composition and a method thereof |
| CN108285766A (en) * | 2018-02-05 | 2018-07-17 | 深圳市鑫东邦科技有限公司 | One kind exempting from pressurize PUR hot melt adhesives and preparation method thereof |
| CN114045143A (en) * | 2021-11-23 | 2022-02-15 | 广州市白云化工实业有限公司 | High-transparency reactive polyurethane hot melt adhesive and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 陈利民等: "沸石分子筛对消除聚氨酯胶粘剂固化气泡作用的研究", 中国胶粘剂, vol. 14, no. 7, pages 246 - 248 * |
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