CN114316873A - Reactive hot melt adhesive for corrugated paper mounting and preparation method thereof - Google Patents
Reactive hot melt adhesive for corrugated paper mounting and preparation method thereof Download PDFInfo
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- CN114316873A CN114316873A CN202011060283.0A CN202011060283A CN114316873A CN 114316873 A CN114316873 A CN 114316873A CN 202011060283 A CN202011060283 A CN 202011060283A CN 114316873 A CN114316873 A CN 114316873A
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- hot melt
- melt adhesive
- corrugated paper
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- polyester polyol
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Abstract
The invention relates to a reactive hot melt adhesive for corrugated paper pasting and a preparation method thereof, wherein the reactive hot melt adhesive comprises the following components in parts by weight: 55-75 parts of polyester polyol, 10-25 parts of polyether polyol, 0.5-1.0 part of antioxidant, 10-20 parts of isocyanate, 5-10 parts of tackifying resin and 0.1 part of catalyst. Compared with the prior art, the moisture-curing reactive polyurethane hot melt adhesive prepared by the invention meets the requirements of full-automatic corrugated board mounting by designing the raw material proportion and the corresponding preparation steps, has 100% of solid content and zero VOC, and can meet the requirements of good fluidity, low use temperature, controllable positioning time and high positioning strength in the gluing process, and the full-automatic assembly line requirement is met.
Description
Technical Field
The invention belongs to the technical field of reactive hot melt adhesives, relates to a reactive hot melt adhesive for corrugated paper mounting and a preparation method thereof, and particularly relates to a moisture-curing reactive polyurethane hot melt adhesive for mounting surface paper and corrugated paper of a full-automatic corrugated carton and a preparation method thereof.
Background
Traditional corrugated paper is mounted and is adopted the bonding mode of white latex or starch adhesive, and white latex is water latex, through the coating after, need carry out high temperature drying through a section very long drying tunnel, uses a large amount of energy, can only be used for continuous quick single continuous production moreover, and the starch adhesive of usefulness, because there is a large amount of water in the colloid and goes out the viscous force lower, need adopt to stand for a long time and dry, two kinds of colloids are not applicable to full automatization flexibility production mode like this.
Disclosure of Invention
The invention aims to overcome the defect that the water-based adhesive used for corrugated paper mounting in the prior art cannot be matched with an efficient automatic flexible production mode, and provides the reactive hot melt adhesive for corrugated paper mounting, which has the advantages of quick mounting, quick positioning and high bonding strength, and the preparation method thereof.
The purpose of the invention can be realized by the following technical scheme:
the invention provides a reactive hot melt adhesive for corrugated paper pasting, which comprises the following components in parts by weight:
preferably, the polyester polyol includes one or more of a high crystalline polyester polyol, an amorphous solid polyester polyol and an amorphous liquid polyester polyol.
Further preferably, the polyester polyol is selected from a high crystalline polyester polyol, an amorphous solid polyester polyol and an amorphous liquid polyester polyol.
Further preferably:
the high-crystallinity polyester polyol comprises polyhexamethylene dodecanedioate, polyhexamethylene adipate, polybutylene adipate and the like;
the amorphous solid polyester polyol comprises polyhexamethylene phthalate, polyhexamethylene terephthalate and the like;
the amorphous liquid polyester polyol comprises neopentyl glycol adipate and the like.
Still more preferably, the polyester polyol is a blend of polyhexamethylene adipate having a molecular weight of 8500g/mol, polybutylene adipate having a molecular weight of 2000g/mol, polyhexamethylene phthalate having a molecular weight of 2000g/mol, and neopentyl glycol adipate having a molecular weight of 2000 g/mol.
Preferably, the polyether polyol comprises polypropylene glycol or polyethylene glycol.
Preferably, the isocyanate is 4, 4' -diphenylmethane diisocyanate.
Preferably, the tackifying resin comprises an acrylic resin or a high molecular weight polyester resin.
Preferably, the antioxidant comprises antioxidant 1010, antioxidant 1076 or antioxidant 168.
Preferably, the catalyst is stannous octoate, tetrabutyl titanate or tetraisopropyl titanate.
The invention provides a preparation method of a reactive hot melt adhesive for corrugated paper pasting, which is characterized by comprising the following steps:
(1) heating and melting polyester polyol, polyether polyol, tackifying resin and antioxidant according to a ratio, uniformly stirring, and simultaneously carrying out vacuum dehydration;
(2) under the protection of nitrogen, adding isocyanate into the reaction system in the step (1) according to the proportion, raising the temperature, and reacting to obtain the reactive hot melt adhesive for corrugated paper mounting.
Preferably, the temperature for the heating and melting in step (1) is 80 ℃.
Preferably, the time for vacuum dehydration in step (1) is 2 h.
Preferably, the temperature is increased to 120 ℃ in step (2).
Preferably, the reaction time in step (2) is 2 h.
The invention is a moisture-curing reactive polyurethane hot melt adhesive, the molecular chain of the hot melt adhesive product contains urethane groups or isocyanate groups, the hot melt adhesive is a material containing active hydrogen, the hot melt adhesive has excellent adhesive property with paper, compared with the traditional white latex, the hot melt adhesive does not need to be dried at high temperature and can be quickly positioned, the problems of quick mounting and accurate positioning in high-efficiency automatic production to provide strength can be solved, the energy consumption is reduced, and the VOC is zero.
Compared with the prior art, the moisture-curing reactive polyurethane hot melt adhesive obtained by designing the raw material proportion and the corresponding preparation steps and processes meets the requirements of a full-automatic production line on the conditions that the paper can be quickly positioned within 5-10s and the paper can reach a certain bonding strength after 20-50 s during the mounting of the full-automatic corrugated board, the adhesive has 100 percent of solid content and zero VOC (volatile organic compound), and can meet the requirements of good fluidity, low use temperature, controllable positioning time and high positioning strength in the gluing process.
Detailed Description
A reactive hot melt adhesive for corrugated paper mounting comprises the following components in parts by weight: 55-75 parts of polyester polyol, 10-25 parts of polyether polyol, 0.5-1.0 part of antioxidant, 10-20 parts of isocyanate, 5-10 parts of tackifying resin and 0.1 part of catalyst.
For example, the composition can be composed of the following components in parts by weight: 55 parts of polyester polyol, 25 parts of polyether polyol, 0.5 part of antioxidant, 20 parts of isocyanate, 5 parts of tackifying resin and 0.1 part of catalyst. The composition can be prepared from the following components in parts by weight: 75 parts of polyester polyol, 10 parts of polyether polyol, 1.0 part of antioxidant, 10 parts of isocyanate, 10 parts of tackifying resin and 0.1 part of catalyst. The adhesive also comprises 60 parts of polyester polyol, 20 parts of polyether polyol, 0.9 part of antioxidant, 12 parts of isocyanate, 8 parts of tackifying resin and 0.1 part of catalyst. And so on.
The polyester polyol can be one or more of high-crystalline polyester polyol, amorphous solid polyester polyol and amorphous liquid polyester polyol. For example, any of the three polyester polyols may be used, and a mixture of a high crystalline polyester polyol and an amorphous solid polyester polyol, a mixture of a fixed solid polyester polyol and an amorphous liquid polyester polyol, a mixture of a high crystalline polyester polyol and an amorphous liquid polyester polyol, or a mixture of a high crystalline polyester polyol, an amorphous solid polyester polyol and an amorphous liquid polyester polyol may be used. Further preferably, the high-crystalline polyester polyol comprises one or more of polyhexamethylene dodecanedioate, polyhexamethylene adipate, polybutylene adipate and the like, and different molecular weights can be selected; the amorphous solid polyester polyol comprises one or more of polyhexamethylene phthalate, polyhexamethylene terephthalate and the like, and different molecular weights can be selected; the amorphous liquid polyester polyol comprises poly neopentyl glycol adipate and the like, and different molecular weights can be selected. The polyether polyol can be selected from polypropylene glycol, polyethylene glycol, etc.
In the corrugated paper mounting, because the high automation of machine production has relatively high requirements on positioning time, product fluidity, initial adhesion and wettability to a base material, in the invention, the polyester polyol is preferably selected from high crystalline polyester polyol, amorphous solid polyester polyol and amorphous liquid polyester polyol for mixing. The high-crystallinity polyester polyol is added, so that the whole colloid has certain strength due to rapid crystallization and solidification in the process of temperature reduction after sizing, corrugated paper is accurately bonded, formed and positioned, and the added amorphous solid polyester polyol and amorphous liquid polyester polyol adjust the initial adhesion of the product and the wettability of the product to paper. It is further preferred that the polyester polyol is a mixture of polyhexamethylene adipate, polybutylene adipate, polyhexamethylene phthalate and neopentyl glycol adipate, and it is further preferred that the polyester polyol is a mixture of polyhexamethylene adipate having a molecular weight of 8500g/mol, polybutylene adipate having a molecular weight of 2000g/mol, polyhexamethylene phthalate having a molecular weight of 2000g/mol and neopentyl glycol adipate having a molecular weight of 2000 g/mol. The polyether glycol with low molecular weight can improve the wettability of the hot melt adhesive product to a base material, and can also have certain solubility to tackifying resin in the production process, so that the phase separation phenomenon is not caused. Preference is given to using the polyether polyols in the form of polyethylene glycols having a molecular weight of 1000 g/mol.
The isocyanate may be 4, 4' -diphenylmethane diisocyanate, etc. The tackifier resin may be acrylic resin or high molecular weight polyester resin. The antioxidant can be selected from antioxidant 1010, antioxidant 1076, antioxidant 168, etc. The catalyst can be stannous octoate, tetrabutyl titanate, tetraisopropyl titanate or the like.
The preparation method of the reactive hot melt adhesive for corrugated paper pasting comprises the following steps:
(1) heating and melting polyester polyol, polyether polyol, tackifying resin and antioxidant according to a ratio, uniformly stirring, and simultaneously carrying out vacuum dehydration;
(2) under the protection of nitrogen, adding isocyanate into the reaction system in the step (1) according to the proportion, raising the temperature, and reacting to obtain the reactive hot melt adhesive for corrugated paper mounting.
The heating and melting temperature in the step (1) can be selected from 80 ℃, and the vacuum dehydration time can be selected from 2 h.
In the step (2), the temperature can be increased to 120 ℃, and the reaction time can be selected to be 2 h.
The present invention will be described in detail with reference to specific examples.
Example 1
The reactive hot melt adhesive for corrugated paper pasting in the embodiment comprises the following components in parts by weight:
the preparation method of the reactive hot melt adhesive for corrugated paper pasting comprises the following steps:
(1) heating polyester polyol, polyether polyol, tackifying resin and an antioxidant to 80 ℃ according to a ratio, melting, uniformly stirring, and simultaneously performing vacuum dehydration for 2 hours;
(2) and (2) under the protection of nitrogen, adding isocyanate into the reaction system in the step (1) according to the proportion, raising the temperature to 120 ℃, and reacting for 2 hours to obtain the reactive hot melt adhesive for corrugated paper mounting.
Example 2
The reactive hot melt adhesive for corrugated paper pasting in the embodiment comprises the following components in parts by weight:
the preparation method of the reactive hot melt adhesive for corrugated paper pasting comprises the following steps:
(1) heating polyester polyol, polyether polyol, tackifying resin and an antioxidant to 80 ℃ according to a ratio, melting, uniformly stirring, and simultaneously performing vacuum dehydration for 2 hours;
(2) and (2) under the protection of nitrogen, adding isocyanate into the reaction system in the step (1) according to the proportion, raising the temperature to 120 ℃, and reacting for 2 hours to obtain the reactive hot melt adhesive for corrugated paper mounting.
Example 3
The reactive hot melt adhesive for corrugated paper pasting in the embodiment comprises the following components in parts by weight:
the preparation method of the reactive hot melt adhesive for corrugated paper pasting comprises the following steps:
(1) heating polyester polyol, polyether polyol, tackifying resin and an antioxidant to 80 ℃ according to a ratio, melting, uniformly stirring, and simultaneously performing vacuum dehydration for 2 hours;
(2) under the protection of nitrogen, adding isocyanate into the reaction system in the step (1) according to the proportion, raising the temperature to 120 ℃, and reacting for 2h to obtain the reactive hot melt adhesive for corrugated paper mounting.
Indexes such as positioning time, peeling strength and machine adaptability when the reactive hot melt adhesive of the embodiment 1-3 is fully-automatic corrugated board mounting are tested. During the test, a paper cutter is used for cutting corrugated sheets with the size of about 10 × 10cm and face paper with the size of 1 × 15cm, the prepared hot melt adhesive is heated to 120 ℃ to be melted, the hot melt adhesive is uniformly coated on the ridges of the corrugated sheets through a coating rod, the face paper is adhered to the position coated with the hot melt adhesive after the coating is finished for about 10 seconds, the face paper and the corrugated paper are torn and separated by hand after the timing is about 1 minute, and whether the paper layer is damaged or not is observed.
See table 1 for relevant results.
TABLE 1
| Example 1 | Example 2 | Example 3 | |
| Positioning time | 20-40s | For 5min or more | 5-8s |
| Peel strength | 12N/m | 5N/m | 18N/m |
| Whether to cut into pieces | The bonding part is cut | Can not be cut | Non-adhesive effect |
| Machine compatibility | 100％ | 20％ | 10％ |
Because the high automation of machine production has relatively high requirements on positioning time, product fluidity, initial adhesion and wettability to a base material, the hot melt adhesive synthesized by adding poly adipic acid glycol ester and poly butylene adipate with a proper proportion in the embodiment 1 is rapidly crystallized and solidified in the process of temperature reduction after glue application, so that the whole colloid has certain strength, and the corrugated paper is accurately adhered, formed and positioned, so as to play a key role, compared with the cases that the proportion is less, none or too high in the embodiments 2 and 3, the positioning in proper time can not be realized in the on-line production plate making process, or the on-line production requirement can not be met because the colloid is solidified too fast, the embodiment 1 also needs to add poly adipic acid glycol ester, poly neopentyl glycol adipate and polyether with a certain proportion to adjust the initial adhesion of the product, the polyether glycol with low molecular weight can improve the wettability of the hot melt adhesive product to a base material, and can also have certain solubility to tackifying resin in the production process, so that the phenomenon of phase separation is not caused. As can be seen from Table 1, compared with example 1, the addition amount of the materials in examples 2 and 3 is changed, so that the positioning time of the product is respectively too long or too short, and the positioning time does not meet the practical application requirement of the product.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The reactive hot melt adhesive for corrugated paper mounting is characterized by comprising the following components in parts by weight:
2. the reactive hot melt adhesive for corrugated paper pasting as claimed in claim 1, wherein the polyester polyol comprises one or more of a high crystalline polyester polyol, an amorphous solid polyester polyol and an amorphous liquid polyester polyol.
3. The reactive hot melt adhesive for corrugated paper pasting according to claim 2, characterized in that:
the high-crystallinity polyester polyol comprises polyhexamethylene dodecanedioate, polyhexamethylene adipate or polybutylene adipate;
the amorphous solid polyester polyol comprises polyhexamethylene phthalate or polyhexamethylene terephthalate;
the amorphous liquid polyester polyol comprises neopentyl glycol adipate.
4. The reactive hot melt adhesive for corrugated paper pasting as claimed in claim 1, wherein the polyether polyol comprises polypropylene glycol or polyethylene glycol.
5. The reactive hot melt adhesive for corrugated paper pasting as claimed in claim 1, wherein the isocyanate is 4, 4' -diphenylmethane diisocyanate.
6. The reactive hot melt adhesive for corrugated paper pasting as claimed in claim 1, wherein the tackifying resin comprises acrylic resin or polyester.
7. The reactive hot melt adhesive for corrugated paper pasting according to claim 1, wherein the antioxidant comprises antioxidant 1010, antioxidant 1076 or antioxidant 168.
8. The reactive hot melt adhesive for corrugated paper mounting as claimed in claim 1, wherein the catalyst is stannous octoate, tetrabutyl titanate or tetraisopropyl titanate.
9. The preparation method of the reactive hot melt adhesive for corrugated paper pasting according to any one of claims 1 to 8, comprising the following steps:
(1) heating and melting polyester polyol, polyether polyol, tackifying resin and antioxidant according to a ratio, uniformly stirring, and simultaneously carrying out vacuum dehydration;
(2) under the protection of nitrogen, adding isocyanate into the reaction system in the step (1) according to a ratio, raising the temperature, and reacting to obtain the reactive hot melt adhesive for corrugated paper mounting.
10. The preparation method of the reactive hot melt adhesive for corrugated paper pasting as claimed in claim 9, wherein any one or more of the following conditions are included:
(i) the temperature of heating and melting in the step (1) is 80 ℃;
(ii) the vacuum dehydration time in the step (1) is 2 hours;
(iii) raising the temperature to 120 ℃ in the step (2);
(iv) the reaction time in the step (2) is 2 hours.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011060283.0A CN114316873A (en) | 2020-09-30 | 2020-09-30 | Reactive hot melt adhesive for corrugated paper mounting and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011060283.0A CN114316873A (en) | 2020-09-30 | 2020-09-30 | Reactive hot melt adhesive for corrugated paper mounting and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005320520A (en) * | 2004-04-09 | 2005-11-17 | Dainippon Ink & Chem Inc | Moisture-curing type polyurethane hot-melt adhesive |
| US20160215185A1 (en) * | 2013-09-26 | 2016-07-28 | Kunshan Tianyang Hot Melt Adhesive Co., Ltd. | Preparation method for moisture-curing polyurethane reactive hot melt adhesive for textile composition |
| CN109536108A (en) * | 2018-11-14 | 2019-03-29 | 南通高盟新材料有限公司 | The moisture-curable polyurethane hot melt adhesive of high-strength high temperature-resistant and preparation method thereof for furniture surfacing |
| CN109777336A (en) * | 2019-01-23 | 2019-05-21 | 杭州之江新材料有限公司 | A kind of PVC reaction type polyurethane hot-melt adhesive and preparation method thereof |
-
2020
- 2020-09-30 CN CN202011060283.0A patent/CN114316873A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005320520A (en) * | 2004-04-09 | 2005-11-17 | Dainippon Ink & Chem Inc | Moisture-curing type polyurethane hot-melt adhesive |
| US20160215185A1 (en) * | 2013-09-26 | 2016-07-28 | Kunshan Tianyang Hot Melt Adhesive Co., Ltd. | Preparation method for moisture-curing polyurethane reactive hot melt adhesive for textile composition |
| CN109536108A (en) * | 2018-11-14 | 2019-03-29 | 南通高盟新材料有限公司 | The moisture-curable polyurethane hot melt adhesive of high-strength high temperature-resistant and preparation method thereof for furniture surfacing |
| CN109777336A (en) * | 2019-01-23 | 2019-05-21 | 杭州之江新材料有限公司 | A kind of PVC reaction type polyurethane hot-melt adhesive and preparation method thereof |
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