CN109439118B - Functional finishing varnish, and preparation method and application thereof - Google Patents

Abstract

The functional finishing varnish is mainly prepared from, by mass, 10-50% of amino modified acrylic copolymer emulsion, 2-4% of thickening agent, 0.2-0.6% of dispersing agent, 0.5-1.1% of wetting agent, 3-5% of film-forming auxiliary agent, 1-4% of antifreezing agent, 0.2-0.5% of defoaming agent, 0.1-0.3% of preservative, 0.1-0.5% of mildew preventive and 39-80% of water. The functional finishing varnish can purify formaldehyde for a long time, prevent dust and stain, prevent mildew and resist bacteria.

Description

Functional finishing varnish, and preparation method and application thereof

Technical Field

The invention relates to the technical field of coatings, in particular to a functional finishing varnish and a preparation method and application thereof.

Background

In the indoor decoration process, the finishing varnish has extremely strong decoration effect due to the advantages of high gloss, high transparency and the like, can be used for the surfaces of various substrates, has the functions of protection and decoration, and is widely applied. However, with the increasing diversification of interior decoration materials, a large amount of synthetic materials such as glue, plates and the like are used, so that after finishing decoration, the content of indoor formaldehyde seriously exceeds the standard, and after long-term exposure in the environment, the formaldehyde can cause harm to the health of human bodies. Along with the gradual enhancement of environmental protection consciousness and health consciousness of people, the indoor formaldehyde content draws more and more attention of people. Because formaldehyde volatilizes from the fitment material, have characteristics such as cycle length, continuous volatilization, the formaldehyde purification technology in the past, like plant purification, physical adsorption, photocatalytic conversion etc. mostly have the purification efficiency low, purification effect shortcoming such as unstable, and the temporary solution is not the cause. Most of the conventional finishing varnish on the market can only play the roles of protection and decoration, but does not have the effect of purifying formaldehyde.

Disclosure of Invention

Based on the above, there is a need for a functional finishing varnish capable of purifying formaldehyde for a long time, and the specific scheme is as follows:

a functional finishing varnish is mainly prepared from the following raw materials in percentage by mass:

the functional finishing varnish adopts amino modified acrylic copolymer emulsion as an emulsion system, and amino can perform nucleophilic addition reaction or Mannich reaction with formaldehyde, so that the aims of consuming formaldehyde and purifying formaldehyde in air for a long time are fulfilled. The functional finishing varnish prepared by scientifically combining the amino modified acrylic copolymer emulsion, the thickening agent, the dispersing agent, the wetting agent, the film-forming additive, the antifreezing agent, the defoaming agent, the preservative, the mildew preventive and water has the effects of purifying formaldehyde for a long time, and has the advantages of dust prevention, stain resistance, mildew prevention, bacteria resistance and the like.

In addition, the functional finishing varnish has excellent environmental protection performance, and meets the marking of 'technical requirements of HJ2537-2014 environmental mark products on water-based paint'; meets the standard of JC/T1074-2008 indoor air purification function coating material purification performance, the purification efficiency is higher than 75 percent, and the purification durability is higher than 60 percent.

In one embodiment, the amino-modified acrylic copolymer emulsion is 25% by mass.

The formaldehyde purification efficiency of the functional finishing varnish is improved along with the increase of the dosage of the amino modified acrylic copolymer emulsion, but when the dosage of the emulsion exceeds 25 percent, the formaldehyde purification efficiency is improved slowly, the dosage cost of the emulsion is considered, and the optimal dosage of the amino modified acrylic copolymer emulsion is 25 percent.

In one embodiment, the viscosity of the amino-modified acrylic copolymer emulsion is 600 to 1000mPa · s, and the glass transition temperature of the amino-modified acrylic copolymer emulsion is 30 to 40 ℃.

The viscosity and the glass transition temperature of the amino modified acrylic copolymer emulsion are controlled, so that the amino modified acrylic copolymer emulsion is more favorable for being combined with other raw materials, and the prepared functional finishing varnish has the effect of purifying formaldehyde for a long time and has more proper drying speed.

In one embodiment, the amino-modified acrylic copolymer emulsion is prepared by copolymerizing methyl methacrylate, N-butyl acrylate, isobornyl methacrylate and a functional monomer selected from at least one of acrylamide, N-methylolacrylamide, N-butoxymethacrylamide, crotonamide, vinylamide and pentenamide; the dosage of the functional monomer is 15-25% of the total mass of the monomers used for preparing the amino modified acrylic copolymer emulsion.

According to the amino modified acrylic copolymer emulsion, methyl methacrylate, n-butyl acrylate, isobornyl methacrylate and a functional monomer are copolymerized, amino in the functional monomer is introduced into the acrylic copolymer emulsion through chemical modification, and then the acrylic copolymer emulsion is compounded with other raw materials, so that the prepared functional finishing varnish not only has the protection and decoration effects of the conventional finishing varnish, but also has the effect of purifying formaldehyde for a long time.

In one embodiment, the thickener is a hydrophobically modified polyurethane thickener.

In one embodiment, the dispersant is a polyacrylic acid sodium salt aqueous dispersant; the wetting agent is an isomeric alcohol polyoxyethylene ether wetting agent; the film-forming additive is alcohol ester twelve; the antifreezing agent is at least one of ethylene glycol, propylene glycol and a high-molecular polyalcohol antifreezing auxiliary agent; the defoaming agent is a silicon-containing defoaming agent.

In one embodiment, the preservative is selected from at least one of cason and 2-Benzisothiazoline (BIT); the mildew preventive is at least one selected from iodopropynyl butyl carbamate (IPBC), methyl formate (BCM) and 2-n-octyl-4-isothiazolin-3-One (OIT).

In one embodiment, the mildewcide is a combination of iodopropynyl butyl carbamate and 2-n-octyl-4-isothiazolin-3-one.

When the functional finishing varnish and the mildew preventive are a combination of IPBC and OIT, the mildew-proof effect is the best.

The application also provides a preparation method of the functional finishing varnish, and the specific scheme is as follows:

a method of preparing the functional overprint varnish described in any one of the above, comprising the steps of:

mixing part of water, a dispersing agent, a wetting agent, a defoaming agent, an antifreezing agent and a film forming additive for 3-5 minutes;

adding amino modified acrylic copolymer emulsion, and mixing for 3-5 minutes;

adding a thickening agent and the other part of water, and mixing for 3-5 minutes;

and sequentially adding the preservative and the mildew preventive, mixing for 3-5 minutes, adding the rest water, and mixing for 3-5 minutes to obtain the functional finishing varnish.

Further, the mixing rate does not exceed 400 r/min.

The preparation method of the functional finishing varnish is simple and feasible, a system with relatively proper viscosity is obtained by mixing water, the dispersing agent, the wetting agent, the defoaming agent, the antifreezing agent and the film-forming additive, and the amino modified acrylic copolymer emulsion is added to prevent the emulsion breaking phenomenon caused by directly adding the emulsion, so that the prepared functional finishing varnish not only can keep the characteristics of the finishing varnish, but also has the function of purifying formaldehyde for a long time; the yield can be improved by preparing the functional finishing varnish step by step.

The application also provides an application of the functional finishing varnish, and the specific scheme is as follows:

application of the functional finishing varnish in preparation of building wall decoration layers.

Detailed Description

In order that the invention may be more fully understood, a more particular description of the invention will now be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the following examples and comparative examples, the starting materials were commercially available as usual products, and water was deionized water.

According to the formula shown in the table 1, the functional finishing varnish of the comparative examples 1-2 and the examples 1-6 are respectively prepared, and the formaldehyde resistance is evaluated according to JC/T1074-.

TABLE 1

It can be known from table 1 that the finishing varnish prepared from the conventional emulsion does not have a formaldehyde purification function, the formaldehyde purification effect of the functional finishing varnish is obvious, the formaldehyde purification efficiency of the functional finishing varnish is improved along with the increase of the dosage of the amino-modified acrylic copolymer emulsion, when the dosage of the amino-modified acrylic copolymer emulsion exceeds 25%, the improvement speed of the formaldehyde purification efficiency of the functional finishing varnish is slowed down and enters a plateau period, and the optimal dosage of the amino-modified acrylic copolymer emulsion is 25% in consideration of the increase of the dosage cost of the emulsion.

According to the formula shown in Table 2, the functional finishing varnish of the embodiment 7-12 is prepared respectively, and the mildew-proof performance is evaluated according to the test method described in GB/T1741-2007 method for testing the mildew-proof performance of the varnish.

TABLE 2

As can be seen from Table 2, the above functional overprint varnish showed the best mold-proofing effect when a combination of IPBC and OIT was used as the mold-proofing agent.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The functional finishing varnish is characterized by being mainly prepared from the following raw materials in percentage by mass:

the amino modified acrylic copolymer emulsion is formed by copolymerizing methyl methacrylate, N-butyl acrylate, isobornyl methacrylate and a functional monomer, wherein the functional monomer is at least one selected from acrylamide, N-hydroxymethyl acrylamide, N-butoxy methacrylamide, crotonamide, vinyl amide and pentenamide; the dosage of the functional monomer is 15 to 25 percent of the total mass of the monomers used for preparing the amino modified acrylic copolymer emulsion;

the viscosity of the amino modified acrylic copolymer emulsion is 600mPa & s-1000 mPa & s, and the glass transition temperature of the amino modified acrylic copolymer emulsion is 30-40 ℃.

2. The functional overprint varnish of claim 1, wherein the amino-modified acrylic copolymer emulsion is present in an amount of 25% by mass.

3. The functional overprint varnish of claim 1, wherein the thickener is a hydrophobically modified polyurethane thickener.

4. The functional overprint varnish of claim 1, wherein the dispersant is a polyacrylic acid sodium salt aqueous dispersant; the wetting agent is an isomeric alcohol polyoxyethylene ether wetting agent; the film-forming additive is alcohol ester twelve; the antifreezing agent is at least one of ethylene glycol, propylene glycol and a high-molecular polyalcohol antifreezing auxiliary agent; the defoaming agent is a silicon-containing defoaming agent.

5. The functional overprint varnish of claim 1, wherein the preservative is selected from the group consisting of cason; the mildew preventive is at least one selected from iodopropynyl butyl carbamate, methyl formate and 2-n-octyl-4-isothiazoline-3-ketone.

6. The functional overprint varnish of claim 5, wherein the mildewcide is a combination of iodopropynyl butyl carbamate and 2-n-octyl-4-isothiazolin-3-one.

7. The functional overprint varnish of claim 4, wherein the preservative is selected from the group consisting of Carsong.

8. The functional overprint varnish of claim 4, wherein the anti-freeze is selected from FT 100.

9. A method for preparing the functional finishing varnish according to any one of claims 1 to 8, characterized by comprising the following steps:

mixing part of water, a dispersing agent, a wetting agent, a defoaming agent, an antifreezing agent and a film forming additive for 3-5 minutes;

adding amino modified acrylic copolymer emulsion, and mixing for 3-5 minutes;

adding a thickening agent and the other part of water, and mixing for 3-5 minutes;

and sequentially adding the preservative and the mildew preventive, mixing for 3-5 minutes, adding the rest water, and mixing for 3-5 minutes to obtain the functional finishing varnish.

10. Use of the functional finishing varnish as claimed in any one of claims 1 to 8 in the preparation of a decorative layer for a building wall.