Highlight acrylic emulsion as well as preparation method and application thereof

Abstract

The invention relates to the technical field of acrylic emulsion, and discloses a highlight acrylic emulsion and a preparation method and application thereof, the highlight acrylic emulsion comprises styrene, butyl acrylate, methacrylic acid, acrylamide, a crosslinking monomer, an emulsifier, an initiator and deionized water, the crosslinking monomer is prepared from glycidyl methacrylate, hydroxyethyl methylacrylate and diacetone acrylamide. The formula of the acrylic emulsion is improved, so that the hardness of the coating can be improved while high gloss performance is provided for the interior and exterior wall coating. According to the invention, a high-gloss and high-hardness product can be prepared from a common monomer, so that the cost of the emulsion and the coating can be well controlled.

Description

Technical Field

[0001] The invention belongs to the technical field of acrylic emulsions, and particularly relates to a high-gloss acrylic emulsion and a preparation method and application thereof. Background Art

[0002] Emulsion plays a key role in building interior and exterior wall decoration materials. Most of the existing interior and exterior wall emulsions are difficult to meet the requirements of high gloss performance, high hardness and room temperature film formation at the same time. Some emulsions have high gloss performance but insufficient hardness and are easily scratched and damaged; most emulsions that can form films at room temperature lack sufficient hardness and gloss, which affects the quality and durability of wall decoration and cannot adapt to complex construction environments and high-quality decoration needs.

[0003] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a high-gloss acrylic emulsion and a preparation method and application thereof, aiming to solve the problem that the existing interior and exterior wall emulsions lack sufficient hardness and glossiness, affect the quality and durability of wall decoration, and cannot adapt to complex construction environments and high-quality decoration requirements.

[0005] The technical solution of the present invention is as follows:

[0006] A high-gloss acrylic emulsion comprises styrene, butyl acrylate, methacrylic acid, acrylamide, a cross-linking monomer, an emulsifier, an initiator, and deionized water, wherein the cross-linking monomer is composed of glycidyl methacrylate, hydroxyethyl methacrylate and diacetone acrylamide.

[0007] The high gloss acrylic emulsion comprises, by mass percentage, 23.5%-24% of styrene, 20.5%-21% of butyl acrylate, 1.5%-1.7% of methacrylic acid, 0.3%-0.4% of acrylamide, 0.55%-0.85% of a crosslinking monomer, 0.75%-0.95% of an emulsifier, 0.2%-0.25% of an initiator, and the balance of deionized water.

[0008] In the high gloss acrylic emulsion, the 0.55-0.85% cross-linking monomer is composed of 0.05%-0.1% glycidol methacrylate, 0.45%-0.55% hydroxyethyl methacrylate, and 0.05%-0.2% diacetone acrylamide.

[0009] A method for preparing the high gloss acrylic emulsion according to the present invention, comprising the steps of:

[0010] 26.3%-26.7% of styrene, 67.1%-67.5% of butyl acrylate, 0.7%-0.75% of acrylamide, 3.4%-3.7% of methacrylic acid, 0.7%-0.74% of hydroxyethyl methacrylate, 0.45%-0.5% of an emulsifier and the balance of deionized water are stirred and mixed to prepare a core layer emulsion;

[0011] 71.1%-71.5% of styrene, 22.3%-22.7% of butyl acrylate, 0.7%-0.75% of acrylamide, 3.4%-3.7% of methacrylic acid, 0.7%-0.74% of hydroxyethyl methacrylate, 0.16%-0.19% of glycidyl methacrylate, 0.87%-0.92% of diacetone acrylamide, 0.45%-0.5% of emulsifier and the balance of deionized water are stirred and mixed to prepare a shell emulsion, wherein the mass ratio of the shell emulsion to the core emulsion is 6:4;

[0012] Add the remaining emulsifier into the reaction kettle and heat it to 83-88°C, and add 25%-30% of the total amount of initiator to form a base material;

[0013] Synchronously add the core layer emulsion and 28-29% of the total amount of the initiator to the base material, keep the temperature for 20-40 minutes after the core layer emulsion is added, and then start to add the shell layer emulsion and the remaining initiator, keep the temperature in the kettle at 83-88° C. during the addition, adjust the pH to 7-8.5 after the reaction is completed, and obtain the high gloss acrylic emulsion.

[0014] An application of the high-gloss acrylic emulsion according to the present invention, wherein the high-gloss acrylic emulsion is used to prepare interior wall latex paint.

[0015] The application of the high-gloss acrylic emulsion, wherein the interior wall latex paint comprises, by mass percentage, 25% water, 50% high-gloss acrylic emulsion, 0.32% cellulose, 0.12% pH regulator, 0.5% defoamer, 0.3% wetting agent, 0.5% preservative, 18% titanium dioxide, 1% propylene glycol, 1.49% film-forming aid, 2% opaque polymer, 0.3% polyurethane thickener, and 0.2% defoamer.

[0016] Beneficial effects: The present invention improves the formula of acrylic emulsion, provides high gloss performance for interior and exterior wall coatings, and can also improve the hardness of the coating. The present invention can use relatively common monomers to make high gloss and high hardness products, and well control the cost of emulsion and coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a flow chart of a method for preparing a high-gloss acrylic emulsion.

[0018] Figure 2 A film of the high gloss acrylic emulsion prepared in Examples 1-2 and the commercial high gloss emulsion 400H was scraped on coated paper and dried naturally. The gloss comparison chart at different angles (20-85°) was tested using a gloss meter.

[0019] Figure 3 A film of the high gloss acrylic emulsion prepared in Examples 1-2 and the commercial high gloss emulsion 400H was scraped on black and white cardboard, dried naturally, and the gloss at different angles (20-85°) was tested with a gloss meter.

[0020] Figure 4 A film of the high gloss acrylic emulsion prepared in Examples 1-2 and the commercial high gloss emulsion 400H was scraped on a glass plate and dried naturally. The gloss at different angles (20-85°) was tested with a gloss meter. DETAILED DESCRIPTION

[0021] The present invention provides a high gloss acrylic emulsion and a preparation method and application thereof. To make the purpose, technical scheme and effect of the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" or "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] Most interior and exterior wall styrene acrylic emulsions have a relatively low gloss. Interior and exterior wall paints can improve their gloss by adding fillers, but this will make the paint surface rough, reduce the gloss of the paint, and increase the cost. Most high-hardness emulsions have a relatively high TG. When used in interior and exterior wall paints, it will increase the use of other additives, resulting in poor environmental performance of the paint, which is not in line with the development trend of green buildings. There are very few interior and exterior wall emulsions on the market that provide high gloss and high hardness properties for paints through emulsions.

[0024] Based on this, the present invention provides a high gloss acrylic emulsion, which includes styrene, butyl acrylate, methacrylic acid, acrylamide, a crosslinking monomer, an emulsifier, an initiator, and deionized water, wherein the crosslinking monomer is composed of glycidyl methacrylate, hydroxyethyl methacrylate, and diacetone acrylamide. The present invention improves the formula of the acrylic emulsion, uses relatively common monomers, provides high gloss performance for interior and exterior wall coatings, and can also improve the hardness of the coating, thereby well controlling the cost of the emulsion and the coating.

[0025] In some embodiments, the high gloss acrylic emulsion comprises, by mass percentage, 23.5%-24% of styrene, 20.5%-21% of butyl acrylate, 1.5%-1.7% of methacrylic acid, 0.3%-0.4% of acrylamide, 0.55-0.85% of a cross-linking monomer, 0.75%-0.95% of an emulsifier, 0.2%-0.25% of an initiator, and the balance of deionized water.

[0026] In this embodiment, styrene is used as a hard monomer and butyl acrylate is used as a soft monomer. Both of them account for a large part of the emulsion. The gloss of the emulsion is improved by combining a small amount of cross-linking monomers. Specifically, this embodiment improves the gloss of the emulsion by controlling the type and amount of cross-linking monomers. The appropriate molecular weight and narrow distribution in the emulsion polymerization are conducive to the formation of high light performance. The cross-linking monomers described in this embodiment are composed of glycidyl methacrylate, hydroxyethyl methacrylate and diacetone acrylamide, wherein the hydroxyl group in hydroxyethyl methacrylate can react with other functional groups to form a cross-linking reaction to narrow the polymer distribution; diacetone acrylamide has good reactivity and cross-linking performance, good compatibility with other monomers, and can effectively improve the gloss of the emulsion; the molecular structure of glycidyl methacrylate contains both carbon-carbon double bonds and epoxy functional groups, which can undergo both vinyl polymerization and ring-opening polymerization. When copolymerized with hard monomers such as styrene, the glass transition temperature and flexibility can be adjusted, and the gloss of the coating can be improved. Therefore, in this embodiment, adjusting the types and amounts of the three cross-linking monomers can obtain a higher gloss emulsion. The preferred ratio of the cross-linking monomers in the emulsion is: 0.05%-0.1% glycidyl methacrylate, 0.45%-0.55% hydroxyethyl methacrylate, and 0.05%-0.2% diacetone acrylamide.

[0027] Furthermore, the present invention uses a core-shell polymerization acrylic emulsion polymerization process to adjust the ratio of each monomer in the core and shell emulsions of the emulsion without changing the total TG of the emulsion, so that the emulsion shell has high hardness and the total TG of the emulsion remains unchanged, and the emulsion can form a film at room temperature without adding a film-forming aid.

[0028] In some embodiments, a method for preparing the high gloss acrylic emulsion according to the present invention is also provided, such as Figure 1As shown, it includes the steps of:

[0029] S10, stirring and mixing, by mass percentage, 26.3%-26.7% of styrene, 67.1%-67.5% of butyl acrylate, 0.7%-0.75% of acrylamide, 3.4%-3.7% of methacrylic acid, 0.7%-0.74% of hydroxyethyl methacrylate, 0.45%-0.5% of an emulsifier and the remainder of deionized water to prepare a core layer emulsion;

[0030] S20, by mass percentage, 71.1%-71.5% of styrene, 22.3%-22.7% of butyl acrylate, 0.7%-0.75% of acrylamide, 3.4%-3.7% of methacrylic acid, 0.7%-0.74% of hydroxyethyl methacrylate, 0.16%-0.19% of glycidyl methacrylate, 0.87%-0.92% of diacetone acrylamide, 0.45%-0.5% of an emulsifier and the remainder of deionized water are stirred and mixed to prepare a shell emulsion, wherein the mass ratio of the shell emulsion to the core emulsion is 6:4;

[0031] S30, adding the remaining emulsifier into the reaction kettle and heating it to 83-88° C., and adding 25-30% of the total amount of initiator to form a base material;

[0032] S40, start to drop 28-29% of the total amount of the core layer emulsion and the initiator into the base material simultaneously, keep warm for 20-40 minutes after the core layer emulsion is added, then start to drop the shell layer emulsion and the remaining initiator, keep the temperature in the kettle at 83-88°C during the addition, adjust the pH to 7-8.5 after the reaction is completed, and obtain the high gloss acrylic emulsion.

[0033] The present invention uses a core-shell polymerization acrylic emulsion polymerization process to adjust the ratio of each monomer in the core and shell emulsions of the emulsion under the condition that the total TG of the emulsion remains unchanged, so that the shell of the emulsion has high hardness and the total TG of the emulsion remains unchanged, and the emulsion can form a film at room temperature without adding a film-forming auxiliary agent.

[0034] In some embodiments, an application of the high-gloss acrylic emulsion of the present invention is also provided, wherein the high-gloss acrylic emulsion is used to prepare interior wall latex paint, and the interior wall latex paint comprises, by mass percentage, 25% water, 50% high-gloss acrylic emulsion, 0.32% cellulose, 0.12% PH regulator, 0.5% defoamer, 0.3% wetting agent, 0.5% preservative, 18% titanium dioxide, 1% propylene glycol, 1.49% film-forming aid, 2% opaque polymer, 0.3% polyurethane thickener, and 0.2% defoamer. After the high-gloss acrylic emulsion provided by the present invention is used to prepare interior wall latex paint, it has a good high-gloss effect in different angles ranging from 20 to 85 degrees.

[0035] The present invention will be further explained below by means of specific embodiments:

[0036] Example 1

[0037] A high gloss acrylic emulsion comprises, by weight percentage, 24% styrene, 21% butyl acrylate, 1.7% methacrylic acid, 0.4% acrylamide, 0.75% crosslinking monomer, 0.95% emulsifier, 0.25% initiator, and the balance is deionized water; wherein the crosslinking monomer is composed of 0.1% glycidol methacrylate, 0.45% hydroxyethyl methacrylate, and 0.2% diacetone acrylamide, and the preparation steps thereof include:

[0038] 1) 26.7% of styrene, 67.1% of butyl acrylate, 0.75% of acrylamide, 3.4% of methacrylic acid, 0.7% of hydroxyethyl methacrylate, 0.45% of emulsifier and the balance of deionized water were stirred and mixed by mass percentage to prepare a core layer emulsion;

[0039] 2) 71.5% of styrene, 22.7% of butyl acrylate, 0.7% of acrylamide, 3.4% of methacrylic acid, 0.7% of hydroxyethyl methacrylate, 0.19% of glycidyl methacrylate, 0.87% of diacetone acrylamide, 0.45% of emulsifier and the balance of deionized water were stirred and mixed by mass percentage to prepare a shell emulsion, wherein the mass ratio of the shell emulsion to the core emulsion was 6:4;

[0040] 3) Add the remaining emulsifier into the reactor and heat it to 85°C, and add 25% of the total amount of initiator to form a base material;

[0041] 4) Synchronously add the core layer emulsion and 28% of the total amount of the initiator to the base material, keep the temperature for 30 minutes after the core layer emulsion is added, and then start to add the shell layer emulsion and the remaining initiator, keep the temperature in the kettle at 83°C during the addition, adjust the pH to 8 after the reaction is completed, and obtain the high gloss acrylic emulsion.

[0042] Example 2

[0043] A high gloss acrylic emulsion comprises, by weight percentage, 23.5% styrene, 20.5% butyl acrylate, 1.7% methacrylic acid, 0.3% acrylamide, 0.6% crosslinking monomer, 0.75% emulsifier, 0.2% initiator, and the balance is deionized water; wherein the crosslinking monomer is composed of 0.05% glycidol methacrylate, 0.45% hydroxyethyl methacrylate, and 0.1% diacetone acrylamide, and the preparation steps thereof include:

[0044] 1) 26.3% of styrene, 67.5% of butyl acrylate, 0.7% of acrylamide, 3.4% of methacrylic acid, 0.72% of hydroxyethyl methacrylate, 0.5% of emulsifier and the balance of deionized water were stirred and mixed by mass percentage to prepare a core layer emulsion;

[0045] 2) 71.1% of styrene, 22.4% of butyl acrylate, 0.7% of acrylamide, 3.5% of methacrylic acid, 0.7% of hydroxyethyl methacrylate, 0.18% of glycidyl methacrylate, 0.90% of diacetone acrylamide, 0.45% of emulsifier and the balance of deionized water were stirred and mixed to prepare a shell emulsion, wherein the mass ratio of the shell emulsion to the core emulsion was 6:4;

[0046] 3) Add the remaining emulsifier into the reactor and heat it to 88°C, and add 30% of the total amount of initiator to form a base material;

[0047] 4) Synchronously add the core layer emulsion and 29% of the total amount of the initiator to the base material, keep the temperature for 40 minutes after the core layer emulsion is added, and then start to add the shell layer emulsion and the remaining initiator, keep the temperature in the kettle at 85°C during the addition, adjust the pH to 8.5 after the reaction is completed, and obtain the high gloss acrylic emulsion.

[0048] Test Example 1

[0049] The high gloss acrylic emulsion prepared in Examples 1-2 and the commercial high gloss emulsion 400H were scraped onto coated paper, black and white cardboard and glass plate, respectively, and dried naturally. The gloss data at different angles (20-85°) were tested with a gloss meter. The results are shown in Tables 1 and 2. Figure 2-Figure 4 shown.

[0050] Table 1 High gloss effect of emulsion dry film

[0051]

[0052]

[0053] From the data in Table 1 and Figure 2-Figure 4 It can be seen that after the high-gloss acrylic emulsion prepared by the present invention is formed into a film on different substrates, its high-gloss effect at different angles is better than that of the high-gloss product 400H on the market.

[0054] Furthermore, the high-gloss acrylic emulsion prepared in Examples 1-2 and the high-gloss product 400H on the market were prepared into interior wall latex paint, wherein the interior wall latex paint formula was: 25% water, 50% high-gloss acrylic emulsion, 0.32% cellulose, 0.12% pH regulator, 0.5% defoamer, 0.3% wetting agent, 0.5% preservative, 18% titanium dioxide, 1% propylene glycol, 1.49% film-forming aid, 2% opaque polymer, 0.3% polyurethane thickener, and 0.2% defoamer; a layer of film was scraped on coated paper, black and white cardboard, and a glass plate, respectively, and dried naturally, and the gloss data at different angles (20-85°) were tested with a gloss meter, and the results are shown in Table 2.

[0055] Table 2 Corresponding high gloss effect data of interior wall latex paint

[0056]

[0057] It can also be seen from the data in Table 2 that the high-gloss acrylic emulsion prepared by the present invention has good high light efficiency in the range of 20-85° after being used to prepare interior wall latex paint.

[0058] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A high gloss acrylic emulsion, characterized in that: The invention comprises styrene, butyl acrylate, methacrylic acid, acrylamide, a crosslinking monomer, an emulsifier, an initiator and deionized water, wherein the crosslinking monomer is composed of glycidyl methacrylate, hydroxyethyl methacrylate and diacetone acrylamide.

2. The high gloss acrylic emulsion according to claim 1, characterized in that: The high gloss acrylic emulsion comprises, by mass percentage, 23.5%-24% of styrene, 20.5%-21% of butyl acrylate, 1.5%-1.7% of methacrylic acid, 0.3%-0.4% of acrylamide, 0.55%-0.85% of a crosslinking monomer, 0.75%-0.95% of an emulsifier, 0.2%-0.25% of an initiator, and the balance of deionized water.

3. The high gloss acrylic emulsion according to claim 2, characterized in that: The 0.55-0.85% cross-linking monomer is composed of 0.05%-0.1% of glycidol methacrylate, 0.45%-0.55% of hydroxyethyl methacrylate, and 0.05%-0.2% of diacetone acrylamide.

4. A method for preparing the high gloss acrylic emulsion according to any one of claims 1 to 3, characterized in that: Includes steps: 26.3%-26.7% of styrene, 67.1%-67.5% of butyl acrylate, 0.7%-0.75% of acrylamide, 3.4%-3.7% of methacrylic acid, 0.7%-0.74% of hydroxyethyl methacrylate, 0.45%-0.5% of an emulsifier and the balance of deionized water are stirred and mixed to prepare a core layer emulsion; 71.1%-71.5% of styrene, 22.3%-22.7% of butyl acrylate, 0.7%-0.75% of acrylamide, 3.4%-3.7% of methacrylic acid, 0.7%-0.74% of hydroxyethyl methacrylate, 0.16%-0.19% of glycidyl methacrylate, 0.87%-0.92% of diacetone acrylamide, 0.45%-0.5% of emulsifier and the balance of deionized water are stirred and mixed to prepare a shell emulsion, wherein the mass ratio of the shell emulsion to the core emulsion is 6:4; Add the remaining emulsifier to the reactor and heat it to 83-88°C, and add 25-30% of the total amount of initiator to form a base material; Synchronously add the core layer emulsion and 28-29% of the total amount of the initiator to the base material, keep the temperature for 20-40 minutes after the core layer emulsion is added, and then start to add the shell layer emulsion and the remaining initiator, keep the temperature in the kettle at 83-88° C. during the addition, adjust the pH to 7-8.5 after the reaction is completed, and obtain the high gloss acrylic emulsion.

5. An application of the high gloss acrylic emulsion as claimed in any one of claims 1 to 3, characterized in that: The high-gloss acrylic emulsion is used to prepare interior wall latex paint.

6. The use of the high gloss acrylic emulsion according to claim 5, characterized in that: The interior wall latex paint comprises, by mass percentage, 25% water, 50% high gloss acrylic emulsion, 0.32% cellulose, 0.12% PH regulator, 0.5% defoamer, 0.3% wetting agent, 0.5% preservative, 18% titanium dioxide, 1% propylene glycol, 1.49% film-forming aid, 2% opaque polymer, 0.3% polyurethane thickener, and 0.2% defoamer.

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