Water-based adhesive as well as preparation method and application thereof

Abstract

The invention relates to a water-based adhesive as well as a preparation method and application thereof. The water-based adhesive comprises the following components in parts by weight: 20-60 parts of acrylate emulsion, 5-15 parts of quick-drying aldehyde ketone resin, 3-10 parts of non-drying resin, 0.5-3 parts of a first plasticizer, 1-5 parts of a second plasticizer and 1.5-5 parts of a third plasticizer. According to the invention, the quick-drying aldehyde ketone resin, the non-drying resin and the three plasticizers with different vapor pressures are added into the acrylate emulsion, so that the obtained water-based adhesive can be quickly cured and has low shrinkage rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of adhesives, and more particularly to a water-based adhesive, a preparation method and application thereof. BACKGROUND

[0002] Acrylate adhesives are widely used in packaging, textile, wood, construction, electronics and other industries due to their good environmental protection, high safety, good bonding performance and good weather resistance.

[0003] At present, acrylate adhesives used in the construction field have the problem of being unable to simultaneously consider rapid curing and small volume shrinkage: rapid curing is generally pursued by adhesives, but this often leads to excessive volume shrinkage of the adhesives. Excessive volume shrinkage will further lead to problems such as stress concentration at the bonding interface, easy cracking, poor long-term stability, etc.

[0004] The patent with publication number CN107011749A does not simultaneously consider the problem of simultaneously considering rapid curing and small volume shrinkage. SUMMARY

[0005] The primary object of the present application is to overcome the problem of being unable to simultaneously consider rapid curing and small volume shrinkage of the existing acrylate adhesives, and to provide a water-based adhesive. The water-based adhesive can achieve rapid curing while having low shrinkage. In addition, due to the low shrinkage of the water-based adhesive, the stress at the bonding interface is low, thereby improving the peel strength.

[0006] A further object of the present application is to provide a preparation method of the water-based adhesive.

[0007] A further object of the present application is to provide the application of the above-mentioned water-based adhesive as a building adhesive.

[0008] The above-mentioned objects of the present application are achieved by the following technical solutions: A water-based adhesive, comprising the following components by weight fraction: 20-60 parts of an acrylate emulsion, 5-15 parts of a fast-drying aldehyde ketone resin, 3-10 parts of a non-drying resin, 0.5-3 parts of a first plasticizer, 1-5 parts of a second plasticizer, 1.5-5 parts of a third plasticizer; The vapor pressure of the first plasticizer at 25℃ is 0.008-0.012mmHg, the vapor pressure of the second plasticizer at 25℃ is 0.0008-0.0012mmHg, and the vapor pressure of the third plasticizer at 25℃ is 0.000012-0.000016mmHg.

[0009] In the present application, the quick-drying aldehyde ketone resin not only can be quickly cured itself, but also can play a cross-linking role, on the one hand, promoting the quick curing of the water-based adhesive, and on the other hand, using the cross-linking effect to improve the film-forming property of the water-based adhesive, thereby reducing the shrinkage rate of the water-based adhesive; the addition of the non-drying resin is mainly to delay the deep cross-linking of the quick-drying aldehyde ketone resin to the water-based adhesive, so as to avoid causing the water-based adhesive to be excessively cross-linked, and through the synergy of the two, the water-based adhesive is accelerated to be cured while the shrinkage rate of the water-based adhesive is reduced.

[0010] The plasticizer can reduce the shrinkage of the water-based adhesive by reducing the stress in the molecular chain. The present application regulates the vapor pressure of the three plasticizers in different ranges, and uses the different evaporation speeds of the three plasticizers, which not only can accelerate the curing speed of the water-based adhesive, but also can relieve the internal stress in the curing process in stages, and synergistically reduce the shrinkage of the water-based adhesive.

[0011] That is, the water-based adhesive obtained by adding the quick-drying aldehyde ketone resin, the non-drying resin and the three plasticizers with different vapor pressures into the acrylic emulsion can realize fast curing (fast curing speed within 24 hours) while having a low shrinkage rate.

[0012] It should be understood that the quick-drying aldehyde ketone resin of the present application refers to an aldehyde ketone resin with a surface drying time ≤10 min at room temperature; the non-drying resin of the present application refers to a tacky resin with a surface drying time ≥30 min at room temperature.

[0013] Preferably, the acrylic emulsion is at least one of a silicone-acrylate emulsion, a pure-acrylate emulsion or a styrene-acrylate emulsion.

[0014] Preferably, the acrylic emulsion has a Brookfield viscosity of 1000-3000 cps at 25°C.

[0015] Preferably, the acrylic emulsion has a solid content of 40-60 wt%.

[0016] Preferably, the acrylic emulsion is at least one of Bardorf RD-6323 or Qingdao Haona Technology HN-1761A.

[0017] Preferably, the acrylic emulsion is a water-based emulsion.

[0018] Preferably, the water-based adhesive further comprises 25-70 parts of inorganic fillers.

[0019] More preferably, the inorganic fillers are at least one of micron-sized fillers or nano-sized fillers.

[0020] Further preferably, the inorganic fillers comprise 20-50 parts of micron-sized fillers and 5-20 parts of nano-sized fillers. Further preferably, the inorganic fillers comprise 20-50 parts of micron-sized fillers and 5-20 parts of nano-sized fillers.

[0021] Further preferably, the micro-sized filler includes but is not limited to heavy calcium carbonate, with an average particle size of 1000~1500 mesh.

[0022] Further preferably, the nano-sized filler includes but is not limited to nano calcium carbonate, with an average particle size of 50~150 nm.

[0023] Preferably, the quick-drying aldehyde ketone resin is at least one of Changtai CT-3800 or Far Sight W48.

[0024] Preferably, the non-drying resin is at least one of acrylic resin or aldehyde ketone resin.

[0025] Preferably, the non-drying resin is at least one of Far Sight W100 or Shuke SK6516.

[0026] Preferably, the first plasticizer is dimethyl phthalate, the second plasticizer is 2,2,4-trimethyl-1,3-pentanediol diisobutyrate, and the third plasticizer is dioctyl phthalate.

[0027] Preferably, the water-based adhesive further includes other auxiliary agents 0.05~5 parts, specifically, dispersant 1~3 parts, thickening agent 0.2~1 part, and stabilizer 0.05~0.2 part.

[0028] More preferably, the dispersant includes but is not limited to at least one of Foshan Kao Ning KMT-3189, Bick Chemical silok7116w, Zhongke Hongtai K-243, or Runhong Chemical 5027.

[0029] More preferably, the thickening agent includes but is not limited to at least one of associative alkali-swellable thickener, polyurethane-based thickener, polyamide wax, or anionic alkali-swellable thickener (such as Foshan Fante 8610).

[0030] More preferably, the stabilizer includes but is not limited to at least one of Foshan Kao Ning 4542, Runhong Chemical F452, Runxin Chemical 410, or Hongyu Chemical C49.

[0031] The preparation method of the above water-based adhesive includes the following steps: mixing the components to obtain the water-based adhesive.

[0032] The application of the above water-based adhesive as a building adhesive is also within the protection scope of the present application.

[0033] Compared with the prior art, the present application has the following beneficial effects: The water-based adhesive prepared by adding the fast-drying aldehyde ketone resin, the non-drying resin and the three plasticizers with different vapor pressures into the acrylic emulsion can realize fast curing and has low shrinkage rate. DETAILED DESCRIPTION

[0034] In the present application, the open technical features include the closed technical solutions composed of the listed features, and also include the open technical solutions containing the listed features. In the present application, if no special instructions are given, the distribution of the optional values in the numerical interval (i.e. the numerical range) is regarded as continuous, and includes the two numerical end points (i.e. the minimum value and the maximum value) of the numerical interval and each value between the two numerical end points. If no special instructions are given, when the numerical interval only points to the integers in the numerical interval, the two end point integers of the numerical range and each integer between the two end point integers are equivalent to directly listing each integer. When multiple numerical ranges are provided to describe the features or characteristics, the numerical ranges can be combined. In other words, unless otherwise specified, the numerical ranges disclosed herein should be understood to include any and all sub-ranges therein. The "numerical range" in the numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. The "numerical range" is allowed to include the numerical interval type of percentage interval, ratio interval, ratio interval, etc.

[0035] The mass or weight of the related components mentioned in the embodiment description of the present application can not only refer to the specific content of each component, but also represent the proportional relationship between the mass or weight of each component. Therefore, as long as the content of the related components in the embodiment description of the present application is enlarged or reduced in proportion, it is within the scope disclosed in the embodiment description of the present application. Specifically, the mass or weight mentioned in the embodiment description of the present application can be μg, mg, g, kg, etc. units well known in the chemical field.

[0036] To more clearly and completely describe the technical solution of the present invention, the present invention is further described in detail below through specific embodiments. It should be understood that these embodiments and examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The purpose of providing these embodiments and examples is to make the disclosure of the present invention more thorough and comprehensive. It should also be understood that the present invention can be implemented in many different forms and is not limited to the embodiments and examples described herein. Those skilled in the art can make various modifications or alterations without departing from the spirit of the present invention, and the equivalent forms obtained also fall within the protection scope of the present invention. For example, features described or illustrated as part of one embodiment can be combined in a suitable manner in another embodiment to produce new embodiments. Furthermore, numerous specific details are set forth in the following description to provide a fuller understanding of the present invention. It should be understood that the present invention can be implemented without one or more of these details.

[0037] The raw materials used in each embodiment and comparative example are as follows: Acrylic Emulsion 1#: Badifu, RD-6323, silicone acrylic emulsion, solid content 45wt%, Brookfield viscosity (25℃, No. 3 rotor, 30 rpm) is 1000-2500cps; Acrylic Emulsion 2#: Qingdao Haona Technology, HN-1761A, styrene-acrylic emulsion, solid content 60wt%, Brookfield viscosity (25℃, No. 3 rotor, 30 rpm) is 1000-2000cps; Quick-drying aldehyde-ketone resin #1: Jinan Changtai, CT-3800; Quick-drying aldehyde-ketone resin #2: Jinan Yuantiao, W48; Non-drying resin #1: Jinan Yuantiao, W100; Non-drying resin #2: Shuaike Chemical, SK6516; First plasticizer: dimethyl phthalate, vapor pressure 0.01 mmHg (25℃), commercially available; Second plasticizer: 2,2,4-trimethyl-1,3-pentanediol diisobutyrate, vapor pressure 0.001 mmHg (25°C), commercially available; The third plasticizer: dioctyl phthalate, with a vapor pressure of 1.4 x 10⁻⁶. -5 mmHg (25℃), commercially available Dispersant: Foshan Kening, KMT-3189; Heavy calcium carbonate: 1250 mesh, commercially available; Nano calcium carbonate: average particle size 80nm, commercially available; Thickener: Foshan Fengte, 8610; Stabilizer: Foshan Kening, KMT-4542; The preparation methods of the water-based adhesives in each embodiment and comparative example include the following steps: Weigh each component according to the formula. Slowly add all components except nano-calcium carbonate into the reactor. First, stir slowly for 5 minutes to soak the components (stirring speed of the reactor's stirring rod is 20 rpm, and dispersion speed of the dispersion disc is 500 rpm). Then, adjust the stirring speed to 90 rpm and the dispersion speed to 2000 rpm, and stir at high speed for 50 minutes, keeping the temperature ≤25℃ during this process. Next, reduce the stirring speed to 20 rpm and the dispersion speed to 200 rpm, and add nano-calcium carbonate under these conditions, keeping the temperature ≤25℃ during this process. After the nano-calcium carbonate has been added, adjust the stirring speed to 90 rpm and the dispersion speed to 3000 rpm, and stir at high speed for 40 minutes, keeping the temperature ≤25℃ during this process. Vacuum the product at ≤25℃ for 10 minutes until the vacuum degree is maintained at -0.99 MPa. Discharge the product to obtain the water-based adhesive.

[0038] Examples 1-9 Examples 1-9 provide a series of water-based adhesives, the formulations of which are shown in Table 1.

[0039] Table 1 (parts by weight)

[0040] Comparative Examples 1-6 Comparative Examples 1-6 provide a series of water-based adhesives, the formulations of which are shown in Table 2.

[0041] Table 2 (parts by weight)

[0042] Performance testing The water-based adhesives of each embodiment and comparative example were tested according to the following method: (1) Drying time: GBT 13477.5-2017 (2) 24-hour curing speed: QCT1024-2015 7.8 (3) Volume shrinkage rate: GBT 13477.19-2017 (4) Peel strength: GB / T2790-1995 The performance test results of the water-based adhesives in each embodiment and comparative example are shown in Table 3.

[0043] Table 3

[0044] As can be seen from Table 3: The surface drying time of the water-based adhesives in Examples 1-9 is ≤9 min or less, the curing speed after 24 hours is ≥6.05 mm, and the volume shrinkage rate is ≤15.0%, indicating that the water-based adhesives of the present invention can achieve rapid curing while having low shrinkage. In addition, the water-based adhesives of the present invention also have good peel strength (≥6.5 N / cm).

[0045] Comparative Example 1, without adding non-drying resin and replacing it with an equal amount of fast-drying aldehyde-ketone resin, yielded a water-based adhesive that cured quickly but had a high shrinkage rate. Comparative Example 2, without adding fast-drying aldehyde-ketone resin and replacing it with an equal amount of non-drying resin, yielded a water-based adhesive with a slow curing speed. Comparative Examples 3-5, using only two of the first, second, and third plasticizers, yielded water-based adhesives with a relatively slow curing speed and a relatively high shrinkage rate.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A water-based adhesive, characterized in that, Components including the following weight fractions: 20-60 parts of acrylic emulsion 5-15 parts of fast-drying aldehyde-ketone resin, 3-10 parts of non-drying resin The first plasticizer is 0.5 to 3 parts. 1-5 parts of the second plasticizer, 1.5 to 5 parts of the third plasticizer; The first plasticizer has a vapor pressure of 0.008~0.012 mmHg at 25°C, the second plasticizer has a vapor pressure of 0.0008~0.0012 mmHg at 25°C, and the third plasticizer has a vapor pressure of 0.000012~0.000016 mmHg at 25°C.

2. The water-based adhesive according to claim 1, characterized in that, The acrylate emulsion is at least one of silicone-acrylic emulsion, pure acrylic emulsion, or styrene-acrylic emulsion.

3. The water-based adhesive according to claim 1, characterized in that, The solid content of the acrylate emulsion is 40~60wt%.

4. The water-based adhesive according to claim 1, characterized in that, The fast-drying aldehyde-ketone resin is at least one of Changtai CT-3800 or Yuantiao W48.

5. The water-based adhesive according to claim 1, characterized in that, The non-drying resin is at least one of Yuantiao W100 or Shuai Ke SK6516.

6. The water-based adhesive according to claim 1, characterized in that, The first plasticizer is dimethyl phthalate, the second plasticizer is 2,2,4-trimethyl-1,3-pentanediol diisobutyrate, and the third plasticizer is dioctyl phthalate.

7. The water-based adhesive according to claim 1, characterized in that, The water-based adhesive also includes 25-70 parts of inorganic filler.

8. The water-based adhesive according to claim 1, characterized in that, The water-based adhesive also includes 0.05 to 5 parts of other additives.

9. A method for preparing the aqueous adhesive according to any one of claims 1 to 8, characterized in that, The process includes the following steps: mixing the components to obtain the water-based adhesive.

10. The use of the water-based adhesive according to any one of claims 1 to 8 as a building adhesive.

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