Single-component polyurethane adhesive as well as preparation method, application and condensate thereof
By preparing a single-component polyurethane adhesive containing isocyanate, polyol, catalyst and stabilizer, the problem of two-component adhesive easily generating bubbles in hot pressing composite is solved, and better adhesive performance and higher Productivity.
Patent Information
- Application Number
- CN202411260395.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2024-12-13
AI Technical Summary
The existing two-component polyurethane adhesives are prone to react with water during the hot pressing composite process to generate bubbles, resulting in hollowing or poor bonding between the gypsum board and the steel plate, affecting production efficiency and product qualification rate.
Provide a single-component polyurethane adhesive, including 60 to 80 parts isocyanate, 15 to 40 parts polyol, 0.01 to 0.1 parts catalyst and 0.1 to 0.5 parts stabilizer, which is prepared by vacuum dehydration and insulation reaction to ensure the moisture content in the reactor Less than 0.05%, and stir at suitable temperatures to extend opening time and improve bonding properties.
It extends the opening time of the adhesive, improves the adhesive performance of the gypsum rock wool purification board, avoids hollowing, meets the requirements of the hot press composite process, and improves production efficiency and product qualification rate.
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Abstract
Description
Technical Field
[0001] The invention relates to the field of polyurethane adhesives, and in particular to a one-component polyurethane adhesive, a preparation method, application and cured product thereof. Background Art
[0002] Purification board, also known as clean board, is a special building material made of color-coated board, stainless steel, aluminum alloy board and other materials as surface materials, rock wool, paper honeycomb, glass magnesium board, aluminum honeycomb, magnesium oxysulfide, gypsum board and other materials as core materials, and is compounded by hot pressing or cold pressing with a special adhesive. It is widely used in electronics, pharmaceuticals, food, biology, aerospace, precision instrument manufacturing and scientific research, etc., which require a highly clean environment.
[0003] The adhesive currently used for composite bonding of purification boards on the market is usually a two-component polyurethane adhesive, whose curing agent is isocyanate, which easily reacts with water to produce bubbles. Gypsum rock wool purification boards with "gypsum board + rock wool" as the core material are easy to absorb moisture and dampness. During the hot pressing composite process, the water vapor adsorbed by the gypsum board is more likely to react with the polyurethane adhesive under high temperature conditions to produce bubbles, resulting in hollowing or poor bonding between the gypsum board and the steel plate. The above problems can only be avoided or improved by changing the production process such as cold pressing (i.e. curing at room temperature) or lowering the hot pressing temperature, which greatly affects the production efficiency and product qualification rate. Summary of the invention
[0004] The object of the present invention is to provide a one-component polyurethane adhesive and a preparation method and application thereof, so as to solve the problem that the adhesive's bonding performance decreases when it comes into contact with water, resulting in a significant decrease in product qualification rate and production efficiency during its application.
[0005] According to a first aspect of the present invention, a one-component polyurethane adhesive is provided, comprising the following raw materials in parts by weight: 60-80 parts of isocyanate, 15-40 parts of polyol, 0.01-0.1 parts of catalyst and 0.1-0.5 parts of stabilizer.
[0006] Furthermore, the isocyanate includes one or more combinations of toluene diisocyanate, a mixture of 2,4-diphenylmethane diisocyanate and 4,4'-diphenylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate, carbodiimide-modified 4,4'-diphenylmethane diisocyanate, and polymethylene polyphenyl polyisocyanate.
[0007] Furthermore, the polyol includes one or more combinations of polyoxypropylene diol, polyoxypropylene triol, polyoxybutylene diol, polyoxybutylene triol, polyoxypropylene-ethylene oxide diol, and polyoxypropylene-ethylene oxide triol.
[0008] Furthermore, the catalyst includes: one or more combinations of an organic tin catalyst, an organic bismuth catalyst, and an organic bismuth zinc composite catalyst.
[0009] Furthermore, the stabilizer includes: one or more combinations of acyl chloride, phosphoric acid, carboxylic acid, and sulfonic acid.
[0010] According to a second aspect of the present invention, there is provided a method for preparing the one-component polyurethane adhesive as described in the first aspect, comprising the following steps:
[0011] Add 15 to 40 parts of the polyol into a reaction kettle and vacuum dehydrate until the water content in the reaction kettle is 0 to 0.05%, the vacuum degree is controlled at a first vacuum degree, and the dehydration temperature is controlled at a first temperature;
[0012] Adding 60 to 80 parts of the isocyanate into the reaction system at the second temperature, heating the reaction system to the third temperature and performing a heat preservation reaction for 2 to 3 hours;
[0013] The catalyst and the auxiliary agent are added into the reaction system at the fourth temperature, and the mixture is discharged after stirring for 20 to 30 minutes to obtain the one-component polyurethane adhesive.
[0014] Furthermore, the first vacuum degree is -0.095~-0.098 MPa, and the first temperature is 110~130°C.
[0015] Furthermore, the second temperature is 20-60°C; the third temperature is 70-80°C; and the fourth temperature is 20-50°C.
[0016] According to a third aspect of the present invention, there is provided a cured product obtained by curing the one-component polyurethane adhesive according to the first aspect of the present invention.
[0017] According to a fourth aspect of the present invention, there is provided a gypsum rock wool purification board bonded using the one-component polyurethane adhesive described in the first aspect of the present invention.
[0018] Compared with the prior art, the present invention has the following beneficial effects:
[0019] 1. The open time of the one-component polyurethane adhesive provided by the present invention is prolonged, which means that it can maintain operability for a long time after coating, providing greater flexibility for the production line.
[0020] 2. The one-component polyurethane adhesive provided by the present invention exhibits more excellent bonding performance when applied to gypsum rock wool purification board, and no hollowing occurs between the gypsum board and the steel plate. It can meet the requirements of the hot pressing composite process of the gypsum rock wool purification board and can improve the production efficiency and product qualification rate of the purification board. DETAILED DESCRIPTION
[0021] The one-component polyurethane adhesive of the present invention, its preparation method, application and cured product will be described in more detail below, wherein preferred embodiments of the present invention are shown, and it should be understood that those skilled in the art can modify the present invention described herein while still achieving the beneficial effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art and not as a limitation of the present invention.
[0022] For the sake of clarity, not all features of the actual embodiments are described. In the following description, well-known functions and structures are not described in detail because they would clutter the invention with unnecessary detail. It should be recognized that in the development of any actual embodiment, a large number of implementation details must be made to achieve the developer's specific goals, such as changing from one embodiment to another according to the limitations of the relevant system or the relevant business. In addition, it should be recognized that such development work may be complex and time-consuming, but it is just a routine task for those skilled in the art.
[0023] Advantages and features of the present invention will become more apparent from the following description and claims.
[0024] In one embodiment of the present invention, a one-component polyurethane adhesive is provided, comprising the following raw materials in parts by weight: 60 to 80 parts of isocyanate, 15 to 40 parts of polyol, 0.01 to 0.1 parts of catalyst and 0.1 to 0.5 parts of stabilizer.
[0025] Specifically, the isocyanate includes one or more combinations of toluene diisocyanate, a mixture of 2,4-diphenylmethane diisocyanate and 4,4'-diphenylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate, carbodiimide-modified 4,4'-diphenylmethane diisocyanate, and polymethylene polyphenyl polyisocyanate.
[0026] Specifically, the polyol includes one or more combinations of polyoxypropylene diol, polyoxypropylene triol, polyoxybutylene diol, polyoxybutylene triol, polyoxypropylene-ethylene oxide diol, and polyoxypropylene-ethylene oxide triol.
[0027] Specifically, the catalyst includes: one or more combinations of an organic tin catalyst, an organic bismuth catalyst, and an organic bismuth zinc composite catalyst.
[0028] Specifically, the stabilizer includes: one or more combinations of acyl chloride, phosphoric acid, carboxylic acid, and sulfonic acid.
[0029] The present invention also provides a method for preparing the one-component polyurethane adhesive, comprising the following steps:
[0030] Add 15 to 40 parts of the polyol into a reaction kettle and vacuum dehydrate until the water content in the reaction kettle is 0 to 0.05%, the vacuum degree is controlled at a first vacuum degree, and the dehydration temperature is controlled at a first temperature;
[0031] Adding 60 to 80 parts of the isocyanate into the reaction system at the second temperature, heating the reaction system to the third temperature and performing a heat preservation reaction for 2 to 3 hours;
[0032] The catalyst and the auxiliary agent are added into the reaction system at the fourth temperature, and the mixture is discharged after stirring for 20 to 30 minutes to obtain the one-component polyurethane adhesive.
[0033] Furthermore, the first vacuum degree is -0.095~-0.098 MPa, and the first temperature is 110~130°C.
[0034] Furthermore, the second temperature is 20-60°C; the third temperature is 70-80°C; and the fourth temperature is 20-50°C.
[0035] The present invention also provides a cured product obtained after the one-component polyurethane adhesive is cured.
[0036] The present invention also provides a gypsum rock wool purification board bonded with the one-component polyurethane adhesive.
[0037] According to the above content of the present invention, the embodiments are arranged as follows:
[0038] Embodiment 1
[0039] The present embodiment provides a one-component polyurethane adhesive and a preparation method thereof, wherein the isocyanate is polyphenyl polymethylene polyisocyanate produced by BASF, with a brand name of B1001. The polyol is polyoxypropylene glycol produced by Jurong Ningwu Company, with a brand name of NJ-210. The catalyst is dibutyltin dilaurate, and the stabilizer is diphosgene (DECF).
[0040] The specific preparation steps are as follows:
[0041] 1. In a dry and clean reaction bottle equipped with a stirring device and a vacuum device, first add 300g of NJ-210. After the addition, set the stirring speed to 500~800 rpm, the vacuum degree to -0.098Mpa, heat to 120℃, start vacuum dehydration, take samples to measure the moisture content after 2 hours, and start cooling when the moisture content reaches 0~0.05%;
[0042] 2. After cooling to 20-60°C, add 700g of B1001. After adding, set the stirring speed to 1000-1200 rpm, vacuum degree to -0.098Mpa, heat to 75°C, keep the reaction for 2 hours, then start cooling;
[0043] 3. After cooling to 20-50°C, add 1.0 g of diphosgene and 0.5 g of dibutyltin dilaurate in sequence. After the addition, set the stirring speed to 1000-1500 rpm and the vacuum degree to -0.098 MPa. Continue stirring for 20 minutes, then test the viscosity and NCO content. If they are qualified, filter and discharge the material.
[0044] The one-component polyurethane adhesive prepared in Example 1 has a viscosity of 5000-6500 mPa.s at 24°C, an NCO content of about 19.0%, an open time of more than 1 hour, and a storage period of more than 6 months. It is suitable for the hot pressing composite process production of gypsum rock wool purification boards.
[0045] Embodiment 2
[0046] This embodiment provides a one-component polyurethane adhesive and a preparation method thereof. The isocyanate is polyphenyl polymethylene polyisocyanate produced by Wanhua Company, with a brand name of PM200. The polyol is polypropylene oxide-ethylene oxide copolymer diol produced by Dow Company, with a brand name of VORANOL 4240, and polyoxybutylene triol, with a brand name of VORAPELT5001. The catalyst is dibutyltin dilaurate, and the auxiliary agent is phosphoric acid as a stabilizer.
[0047] The specific preparation steps are as follows:
[0048] 1. In a dry and clean reaction bottle equipped with a stirring device and a vacuum device, first add 300g of VORANOL4240 and 50g of VORAPEL T5001. After the addition, set the stirring speed to 500-800 rpm, the vacuum degree to -0.098Mpa, raise the temperature to 120℃, start vacuum dehydration, take samples to measure the moisture content after 2 hours, and start cooling when the moisture content reaches 0-0.05%;
[0049] 2. After cooling to 20-60°C, add 650 g of PM200. After the addition, set the stirring speed to 1000-1200 rpm, the vacuum degree to -0.098 MPa, raise the temperature to 75°C, keep the reaction for 2 hours, and then start cooling;
[0050] 3. After cooling to 20-50°C, add 2.0 g of phosphoric acid and 0.8 g of dibutyltin dilaurate in sequence. After the addition, set the stirring speed to 1000-1500 rpm and the vacuum degree to -0.098 MPa. Continue stirring for 20 minutes, then test the viscosity and NCO content. If they are qualified, filter and discharge the material.
[0051] The one-component polyurethane adhesive prepared in Example 2 has a viscosity of 6000-7000 mPa.s at 24°C, an NCO content of about 19.0%, an open time of more than 1 hour, and a storage period of more than 6 months. It is suitable for the hot pressing composite process production of gypsum rock wool purification boards.
[0052] Embodiment 3
[0053] In this embodiment, the isocyanate is selected from polyphenyl polymethylene polyisocyanate produced by Huntsman, with a brand name of 5005. The polyol is selected from polyoxypropylene triol produced by Jurong Ningwu Company, with a brand name of NJ-330N, and polypropylene oxide-ethylene oxide copolymer glycol produced by Guodu Chemical, with a brand name of DP-4000E. The catalyst is selected from dibutyltin dilaurate, and the stabilizer is selected from benzoyl chloride.
[0054] The specific preparation steps are as follows:
[0055] 1. In a dry and clean reaction bottle equipped with a stirring device and a vacuum device, first add 250g NJ-330N and 150g DP-4000E. After the addition, set the stirring speed to 500-800 rpm, the vacuum degree to -0.098Mpa, heat to 120℃, start vacuum dehydration, take samples to measure the moisture content after 2 hours, and start cooling when the moisture content reaches 0-0.05%;
[0056] 2. After cooling to 20-60°C, add 600g of 5005. After adding, set the stirring speed to 1000-1200 rpm, vacuum degree -0.098Mpa, heat to 75°C, keep warm for 2 hours, then start cooling;
[0057] 3. After cooling to 20-50°C, add 2.0 g of benzoyl chloride and 0.3 g of dibutyltin dilaurate in sequence. After the addition, set the stirring speed to 1000-1500 rpm and the vacuum degree to -0.098 MPa. Continue stirring for 20 minutes, then test the viscosity and NCO content. If they are qualified, filter and discharge the material.
[0058] The one-component polyurethane adhesive prepared in Example 3 has a viscosity of 5000-6000 mPa.s at 24°C, an NCO content of about 17.5%, an open time of more than 1 hour, and a storage period of more than 6 months. It is suitable for the hot pressing composite process production of gypsum rock wool purification boards.
[0059] The one-component polyurethane adhesive provided by the present invention is used as an example, and the traditional two-component polyurethane adhesive is used as a comparative example, and its basic indicators are tested at 20-25°C; the mechanical properties of the cured products obtained after curing the adhesive provided by the example and the adhesive provided by the comparative example are tested according to relevant national standards; the mechanical properties of the adhesive joints bonded by the example adhesive and the comparative example adhesive are tested according to relevant national standards. The example and the comparative example are used for the hot pressing composite process production of gypsum rock wool purification board, the hot pressing temperature is 50-80°C, the hot pressing time is 5-10min, and the obtained gypsum rock wool purification board is dismantled and inspected; the above test and inspection results are shown in Table 1.
[0060] Table 1: Performance test results of one-component polyurethane adhesive and two-component polyurethane adhesive
[0061]
[0062] Note: Planar tensile failure mode: SF substrate failure; AF interface failure; CF cohesive failure
[0063] It can be seen from the test results in Table 1 that, compared with the traditional two-component polyurethane adhesive, the one-component polyurethane adhesive provided by the present invention has a longer open time, which means that it can maintain operability for a longer time after coating, providing greater flexibility for the production line. In addition, in the application of bonding steel plates to steel plates and bonding gypsum boards to aluminum plates, it can be seen from the tensile shear strength test results and the plane tensile test results that the one-component polyurethane adhesive provided by the present invention exhibits a more excellent bonding effect.
[0064] The gypsum rock wool purification board made by using the one-component polyurethane adhesive provided by the present invention and the traditional two-component polyurethane adhesive was dismantled and inspected, and the composite surface was all substrate damaged. The composite surface of the gypsum board and the steel plate was gypsum board damaged. In the embodiment, the proportion of the gypsum board damaged area was about 90-100%, which was much larger than the proportion of the gypsum board damaged area in the comparative example, that is, the surface paper on the gypsum board was completely bonded to the steel plate, and there was no hollowing or poor bonding. In the embodiment and the comparative example, the rock wool and the gypsum board surface were all rock wool damaged, that is, the rock wool was completely bonded to the gypsum board.
[0065] In summary, in the one-component polyurethane adhesive and preparation method thereof provided in the embodiment of the present invention, the one-component polyurethane adhesive can be cured by rapidly reacting under high temperature conditions by contacting the water vapor released during the hot pressing process of the gypsum board. In addition, since the one-component polyurethane adhesive is an -NCO-terminated isocyanate prepolymer, it has high bonding strength after curing, so that the gypsum board and the steel plate can be firmly bonded together, so that the gas generated during the curing process is difficult to damage its bonding performance. Therefore, the one-component polyurethane adhesive provided by the present invention has excellent bonding performance, can meet the requirements of the hot pressing composite process of gypsum rock wool purification board, and improve the production efficiency and product qualification rate in the production process of gypsum rock wool purification board.
[0066] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any technician in the relevant technical field, without departing from the scope of the technical solution of the present invention, makes any form of equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, which does not depart from the content of the technical solution of the present invention and still falls within the protection scope of the present invention.
Claims
1. A one-component polyurethane adhesive, characterized in that: The invention comprises the following raw materials in parts by weight: 60-80 parts of isocyanate, 15-40 parts of polyol, 0.01-0.1 parts of catalyst and 0.1-0.5 parts of stabilizer.
2. The one-component polyurethane adhesive according to claim 1, characterized in that: The isocyanate includes one or more combinations of toluene diisocyanate, a mixture of 2,4-diphenylmethane diisocyanate and 4,4'-diphenylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate, carbodiimide-modified 4,4'-diphenylmethane diisocyanate, and polymethylene polyphenyl polyisocyanate.
3. The one-component polyurethane adhesive according to claim 1, characterized in that: The polyol includes: one or more combinations of polyoxypropylene diol, polyoxypropylene triol, polyoxybutylene diol, polyoxybutylene triol, polyoxypropylene-ethylene oxide diol, and polyoxypropylene-ethylene oxide triol.
4. The one-component polyurethane adhesive according to claim 1, characterized in that: The catalyst comprises: one or more combinations of an organic tin catalyst, an organic bismuth catalyst, and an organic bismuth-zinc composite catalyst.
5. The one-component polyurethane adhesive according to claim 1, characterized in that: The stabilizer includes: one or more combinations of acyl chloride, phosphoric acid, carboxylic acid, and sulfonic acid.
6. The method for preparing the one-component polyurethane adhesive according to any one of claims 1 to 5, characterized in that: The following steps are involved: Add 15 to 40 parts of the polyol into a reaction kettle and vacuum dehydrate until the water content in the reaction kettle is 0 to 0.05%, the vacuum degree is controlled at a first vacuum degree, and the dehydration temperature is controlled at a first temperature; Adding 60 to 80 parts of the isocyanate into the reaction system at the second temperature, heating the reaction system to the third temperature and performing a heat preservation reaction for 2 to 3 hours; The catalyst and the auxiliary agent are added into the reaction system at the fourth temperature, and the mixture is discharged after stirring for 20 to 30 minutes to obtain the one-component polyurethane adhesive.
7. The method for preparing a one-component polyurethane adhesive according to claim 6, characterized in that: The first vacuum degree is -0.095~-0.098 MPa, and the first temperature is 110~130°C.
8. The method for preparing a one-component polyurethane adhesive according to claim 6, characterized in that: The second temperature is 20-60°C; the third temperature is 70-80°C; and the fourth temperature is 20-50°C.
9. A solidified product, characterized in that: The cured product is obtained by curing the one-component polyurethane adhesive as described in any one of claims 1 to 5.
10. A gypsum rock wool purification board, characterized in that: The gypsum rock wool purification board is obtained by bonding using the one-component polyurethane adhesive as described in any one of claims 1 to 5.