A water-based bonding agent, its preparation method and application

Abstract

This invention discloses a water-based bonding agent, its preparation method, and its application, relating to the technical field of bonding agents. The water-based bonding agent comprises the following components by mass percentage: 10-30% first solvent; 20-50% second solvent; 10-40% third solvent; and 1-20% resin. The relative evaporation rate of the first solvent is 0.001-0.1; the relative evaporation rate of the second solvent is 0.1-1; and the relative evaporation rate of the third solvent is 1-10. This invention uses solvents with different relative evaporation rates to form a solvent gradient. Simultaneously, under the action of the resin, the paint film can quickly level, ensuring that the bonding agent is miscible with water-based coatings and preventing phenomena such as layering and flocculation. Furthermore, during the spraying process, most of the solvent evaporates, reducing the likelihood of problems such as pinholes, blistering, and loss of gloss in the paint film.

Description

Technical Field

[0001] This invention relates to the technical field of interface water, and more particularly to an aqueous interface water, its preparation method, and its application. Background Technology

[0002] Most 4S dealership car repairs on the market use 2K solvent-based clear coat or 2K solvent-based topcoat combined with solvent-based interface filler. When a car's paint is damaged due to bumps or collisions and sent to a 4S dealership for repairs, there are generally two rework methods: the first is to repaint the entire panel, and the second is to repair the damaged area locally. Full panel repair requires overall sanding and painting, increasing labor costs, time, and the amount of repair materials used. Local repair is more economical in terms of labor and materials, and people prefer this method of merging the joints. Currently, water-based repair coatings on the market typically involve sanding and spraying the entire panel. For example, for a scratch on the front door, the old paint on the entire door panel is usually sanded off before applying new water-based repair coating.

[0003] However, current solvent-based joint fillers are immiscible with water, failing to integrate old and new paint films and causing issues such as loss of gloss, pinholes, and whitening in newly repaired water-based varnishes. Therefore, low-VOC coatings such as water-based paints and powder coatings are gradually replacing solvent-based coatings, and solvent-based joint fillers are unsuitable for water-based repair coating systems. Thus, developing a joint filler suitable for water-based repair systems is urgently needed. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a water-based bonding agent, its preparation method, and its application. This invention utilizes solvents with different relative evaporation rates to create a solvent gradient. Simultaneously, under the action of resin, the paint film can quickly level, ensuring that the bonding agent is miscible with water-based coatings and preventing phenomena such as layering and flocculation. Furthermore, during the spraying process, most of the solvent evaporates, reducing the likelihood of problems such as pinholes, blistering, and loss of gloss in the paint film.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] In a first aspect, the present invention provides an aqueous splice solution comprising the following components by mass percentage:

[0007] First solvent 10-30%; second solvent 20-50%; third solvent 10-40%; resin 1-20%;

[0008] The relative evaporation rate of the first solvent is 0.001-0.1; the relative evaporation rate of the second solvent is 0.1-1; and the relative evaporation rate of the third solvent is 1-10.

[0009] The evaporation rates of the first solvent, the second solvent, and the third solvent in this invention are relative evaporation rates of n-butyl acetate as a standard solution, and the evaporation rate of n-butyl acetate at 25°C is 1.

[0010] This invention employs three solvents with different relative evaporation rates to create a solvent gradient. Simultaneously, under the action of the resin, the paint film can quickly level, ensuring that the bonding agent is miscible with the water-based coating and preventing layering, flocculation, or other phenomena. Furthermore, during the spraying process, most of the solvent evaporates, reducing the likelihood of pinholes, blistering, or loss of gloss in the paint film.

[0011] Preferably, the first solvent includes at least one of diethylene glycol butyl ether, dipropylene glycol methyl ether, and ethylene glycol butyl ether. The relative evaporation rates of the diethylene glycol butyl ether, dipropylene glycol methyl ether, and ethylene glycol butyl ether are 0.003, 0.02, and 0.07, respectively.

[0012] Preferably, the second solvent comprises at least one of propylene glycol methyl ether acetate, propylene glycol methyl ether, and dipropanol ketone. The relative evaporation rates of the propylene glycol methyl ether acetate, propylene glycol methyl ether, and dipropanol ketone are 0.4, 0.7, and 0.12, respectively.

[0013] Preferably, the third solvent includes at least one selected from ethanol, isopropanol, ethyl acetate, and acetone. The relative evaporation rates of the ethanol, isopropanol, ethyl acetate, and acetone are 1.7, 1.5, 4, and 5.7, respectively.

[0014] Preferably, the aqueous connector water comprises the following components by mass percentage:

[0015] First solvent 15-20%; second solvent 30-40%; third solvent 20-30%; resin 10-15%.

[0016] Preferably, the resin is an aqueous acrylic emulsion, specifically NEOCRYL XK-103 or NEOCRYL XK-110.

[0017] Preferably, the aqueous acrylic emulsion has a solid content of 42-46%, an acid value (OH) of less than 3.5%, and a viscosity of 100-300 mPa.s at 25°C.

[0018] Preferably, the first solvent is a mixture of diethylene glycol butyl ether and ethylene glycol butyl ether, and the mass ratio of diethylene glycol butyl ether to ethylene glycol butyl ether is (2-3):1.

[0019] Preferably, the second solvent is a mixture of propylene glycol methyl ether acetate and propylene glycol methyl ether, and the mass ratio of propylene glycol methyl ether acetate to propylene glycol methyl ether is 1:(1-2).

[0020] Preferably, the third solvent is a mixture of isopropanol and acetone, and the mass ratio of isopropanol to acetone is 1:(2-3).

[0021] Secondly, the present invention also provides a method for preparing water-based bonding agent, comprising the following steps: mixing a first solvent, a second solvent, a third solvent and a resin evenly to obtain water-based bonding agent.

[0022] Thirdly, the present invention also provides an application of water-based bonding agent in water-based clear varnish for automotive repair. The bonding agent and the curing agent in the water-based clear varnish are mixed evenly at a ratio of 100:2-5 to obtain a mixture, and then the mixture is sprayed onto the automotive repair area.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] This invention employs three solvents with different relative evaporation rates to create a solvent gradient. Simultaneously, under the action of the resin, the paint film can quickly level, ensuring that the bonding agent is miscible with the water-based coating and preventing layering, flocculation, or other phenomena. Furthermore, during the spraying process, most of the solvent evaporates, reducing the likelihood of pinholes, blistering, or loss of gloss in the paint film. Detailed Implementation

[0025] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments, but the scope of protection and implementation of the present invention are not limited thereto.

[0026] Unless otherwise specified, the materials and reagents used in the following examples are commercially available.

[0027] The evaporation rates of the first solvent, the second solvent, and the third solvent in this invention are relative evaporation rates of n-butyl acetate as a standard solution, and the evaporation rate of n-butyl acetate at 25°C is 1.

[0028] Example 1

[0029] A water-based connector comprising the following components by weight percentage:

[0030] First solvent 10%; second solvent 50%; third solvent 31%; resin 9%;

[0031] In this embodiment, the first solvent is diethylene glycol butyl ether; the second solvent is propylene glycol methyl ether acetate; the third solvent is ethanol; and the resin is an aqueous acrylic emulsion, NEOCRYL XK-110.

[0032] This embodiment also discloses a method for preparing water-based bonding agent, including the following steps: mixing a first solvent, a second solvent, a third solvent and a resin evenly to obtain water-based bonding agent.

[0033] Example 2

[0034] A water-based connector comprising the following components by weight percentage:

[0035] First solvent 15%; second solvent 48%; third solvent 25%; resin 12%;

[0036] In this embodiment, the first solvent is dipropylene glycol methyl ether; the second solvent is propylene glycol methyl ether; the third solvent is isopropanol; and the resin is an aqueous acrylic emulsion, NEOCRYL XK-110.

[0037] Example 3

[0038] A water-based connector comprising the following components by weight percentage:

[0039] First solvent 30%; second solvent 20%; third solvent 40%; resin 10%;

[0040] In this embodiment, the first solvent is ethylene glycol butyl ether; the second solvent is dipropanol ketone; the third solvent is acetone; and the resin is an aqueous acrylic emulsion, NEOCRYL XK-103.

[0041] Example 4

[0042] A water-based connector comprising the following components by weight percentage:

[0043] First solvent 30%; second solvent 40%; third solvent 10%; resin 20%;

[0044] In this embodiment, the first solvent is ethylene glycol butyl ether; the second solvent is dipropanol ketone; the third solvent is ethylene glycol; and the resin is an aqueous acrylic emulsion, NEOCRYL XK-103.

[0045] Example 5

[0046] A water-based connector comprising the following components by weight percentage:

[0047] First solvent 10%; second solvent 50%; third solvent 31%; resin 9%;

[0048] In this embodiment, the first solvent is a mixture of diethylene glycol butyl ether and ethylene glycol butyl ether, with a mass ratio of 3:1; the second solvent is propylene glycol methyl ether acetate; the third solvent is ethanol; and the resin is an aqueous acrylic emulsion, NEOCRYL XK-110.

[0049] Example 6

[0050] A water-based connector comprising the following components by weight percentage:

[0051] First solvent 10%; second solvent 50%; third solvent 31%; resin 9%;

[0052] In this embodiment, the first solvent is diethylene glycol butyl ether, the second solvent is a mixture of propylene glycol methyl ether acetate and propylene glycol methyl ether, with a mass ratio of propylene glycol methyl ether acetate to propylene glycol methyl ether of 1:1; the third solvent is ethanol; and the resin is an aqueous acrylic emulsion, NEOCRYL XK-110.

[0053] Example 7

[0054] A water-based connector comprising the following components by weight percentage:

[0055] First solvent 10%; second solvent 50%; third solvent 31%; resin 9%;

[0056] In this embodiment, the first solvent is diethylene glycol butyl ether, the second solvent is propylene glycol methyl ether acetate, the third solvent is a mixture of isopropanol and acetone, and the mass ratio of isopropanol to acetone is 1:2; the resin is an aqueous acrylic emulsion, NEOCRYL XK-110.

[0057] Example 8

[0058] A water-based connector comprising the following components by weight percentage:

[0059] First solvent 10%; second solvent 50%; third solvent 31%; resin 9%;

[0060] In this embodiment, the first solvent is a mixture of diethylene glycol butyl ether and ethylene glycol butyl ether, with a mass ratio of 3:1; the second solvent is a mixture of propylene glycol methyl ether acetate and propylene glycol methyl ether, with a mass ratio of 1:1; the third solvent is a mixture of isopropanol and acetone, with a mass ratio of 1:2; and the resin is an aqueous acrylic emulsion, NEOCRYL XK-110.

[0061] Comparative Example 1

[0062] A water-based connector comprising the following components by weight percentage:

[0063] First solvent 20%; second solvent 50%; third solvent 20%; resin 10%;

[0064] In this comparative example, the first solvent was n-pentane; the second solvent was cyclohexanone; the third solvent was isoamyl acetate; and the resin was an aqueous acrylic emulsion, NEOCRYL XK-110.

[0065] Comparative Example 2

[0066] A water-based connector comprising the following components by weight percentage:

[0067] First solvent 22%; second solvent 55%; third solvent 13%; resin 10%;

[0068] In this comparative example, the first solvent was acetone; the second solvent was ethanol; the third solvent was dipropanol ketone; and the resin was an aqueous acrylic emulsion, NEOCRYL XK-103.

[0069] Comparative Example 3

[0070] A water-based connector comprising the following components by weight percentage:

[0071] First solvent 10%; second solvent 50%; third solvent 30%; resin 10%;

[0072] In this comparative example, the first solvent is dipropylene glycol butyl ether; the second solvent is ethylene glycol butyl ether; the third solvent is propylene glycol methyl ether; and the resin is an aqueous acrylic emulsion, NEOCRYL XK-103.

[0073] Comparative Example 4

[0074] A water-based connector comprising the following components by weight percentage:

[0075] First solvent 15%; second solvent 50%; third solvent 25%; resin 10%;

[0076] In this comparative example, the first solvent is ethylene glycol butyl ether; the second solvent is propylene glycol methyl ether acetate; the third solvent is isopropanol; and the resin is Bayer polyurethane dispersion UH 2648.

[0077] Comparative Example 5

[0078] A water-based connector comprising the following components by weight percentage:

[0079] First solvent 5%; second solvent 55%; third solvent 31%; resin 9%;

[0080] In this comparative example, the first solvent is diethylene glycol butyl ether; the second solvent is propylene glycol methyl ether acetate; the third solvent is ethanol; and the resin is an aqueous acrylic emulsion, NEOCRYL XK-110.

[0081] Comparative Example 6

[0082] A water-based connector comprising the following components by weight percentage:

[0083] First solvent 40%; second solvent 10%; third solvent 25%; resin 25%;

[0084] In this comparative example, the first solvent is diethylene glycol butyl ether; the second solvent is propylene glycol methyl ether acetate; the third solvent is ethanol; and the resin is an aqueous acrylic emulsion, NEOCRYL XK-110.

[0085] Comparative Example 7

[0086] A water-based connector comprising the following components by weight percentage:

[0087] First solvent 10%; second solvent 31%; third solvent 50%; resin 9%;

[0088] In this comparative example, the first solvent is diethylene glycol butyl ether; the second solvent is propylene glycol methyl ether acetate; the third solvent is ethanol; and the resin is an aqueous acrylic emulsion, NEOCRYL XK-110.

[0089] The preparation methods of the aqueous bonding water described in Examples 2-8 and Comparative Examples 1-7 are the same as those in Example 1.

[0090] experiment

[0091] The water-based joint filler prepared in the above examples and comparative examples was mixed with the hardener in the water-based varnish at a mass ratio of 100:2 to obtain a mixture. The mixture was then sprayed twice thinly onto the new and old joints, and then flash-dried and baked according to the normal process for water-based repair varnish. The experimental results are shown in Table 1.

[0092] Table 1

[0093]

[0094]

[0095] Comparing Comparative Examples 1-4 with the Examples, it can be seen that the bonding agent described in Comparative Example 1 is immiscible with water. When added to the water-based varnish, it causes layering, and when sprayed onto the interface to be repaired, it easily produces pinholes. In Comparative Example 2, no solvent gradient was formed, and the solvent evaporated too quickly, failing to dissolve the old paint film, resulting in a still noticeable interface between the old and new paint films. In Comparative Example 3, no solvent gradient was formed, and the solvent evaporated too slowly, causing the drying speed at the interface between the old and new paint films to be significantly slower than that of the water-based repair area, and the slow drying resulted in a loss of gloss and whitening. In Comparative Example 4, the resin exhibited demulsification, producing fine particles, and the paint film formed by spraying the board consisted of dense small particles.

[0096] Therefore, the relative evaporation rates of the three solvents described in this invention can only effectively form a solvent gradient within the range defined by this invention. Simultaneously, under the action of the resin, the paint film can quickly level, ensuring that the bonding agent is miscible with the water-based coating and preventing phenomena such as layering and flocculation. Furthermore, during the spraying process, most of the solvent evaporates, reducing the likelihood of problems such as pinholes, blistering, and loss of gloss in the paint film.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An aqueous barge mouth water, characterized in that, Comprise the following components by mass percentage: The first solvent 10-30%; the second solvent 20-50%; the third solvent 10-40%; the resin 1-20%; The relative volatilization rate of the first solvent is 0.001-0.1; the relative volatilization rate of the second solvent is 0.1-1; the relative volatilization rate of the third solvent is 1-10; The first solvent comprises at least one of diethylene glycol butyl ether, dipropylene glycol methyl ether, ethylene glycol butyl ether, the second solvent comprises at least one of propylene glycol methyl ether acetate, propylene glycol methyl ether, dipropyl ketone, and the third solvent comprises at least one of ethanol, isopropyl alcohol, ethyl acetate, acetone; The resin is an aqueous acrylic emulsion; The volatilization speed of the first solvent, the second solvent and the third solvent is the relative volatilization rate of the standard solution of n-butyl acetate, and the volatilization speed of n-butyl acetate at 25℃ is 1.

2. The aqueous barge water of claim 1, wherein, The aqueous primer water comprises the following components by mass percentage: The first solvent 15-20%; the second solvent 30-40%; the third solvent 20-30%; the resin 10-15%.

3. The aqueous barge water of claim 1, wherein, The solid content of the aqueous acrylic emulsion is 42-46%, and the viscosity is 100-300 mPa.s@25℃.

4. The aqueous barge water of claim 1, wherein, The first solvent is a mixture of diethylene glycol butyl ether and ethylene glycol butyl ether, and the mass ratio of the diethylene glycol butyl ether and the ethylene glycol butyl ether is (2-3):

1.

5. The aqueous barge water of claim 1, wherein, The second solvent is a mixture of propylene glycol methyl ether acetate and propylene glycol methyl ether, and the mass ratio of the propylene glycol methyl ether acetate and the propylene glycol methyl ether is 1:(1-2).

6. The aqueous barge water of claim 1, wherein, The third solvent is a mixture of isopropyl alcohol and acetone, and the mass ratio of the isopropyl alcohol and the acetone is 1:(2-3).

7. The method of preparing aqueous dashi broth according to any one of claims 1 to 6, wherein Comprise the following steps: uniformly mixing the first solvent, the second solvent, the third solvent and the resin, to obtain the aqueous primer water.

8. Use of the aqueous washcoat water according to any one of claims 1 to 6 in an aqueous automotive refinish clearcoat, characterized in that, Mix the primer water and the curing agent in the aqueous varnish uniformly according to a mass ratio of 100:2-5, to obtain a mixture, and then spray the mixture on the automobile repair site.

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