CN115058141B

CN115058141B - Mildew preventive containing BCM

Info

Publication number: CN115058141B
Application number: CN202210787010.9A
Authority: CN
Inventors: 李广; 李金庆; 黄扎纲
Original assignee: Guangxi Weiyi Paint Manufacturing Co ltd
Current assignee: Guangxi Weiyi Paint Manufacturing Co ltd
Priority date: 2022-07-06
Filing date: 2022-07-06
Publication date: 2023-08-15
Anticipated expiration: 2042-07-06
Also published as: CN115058141A

Abstract

The invention belongs to the technical field of building coating, and particularly relates to a mildew inhibitor containing BCM. A mildew preventive containing BCM comprises active ingredients of BCM and bergenia lactone according to the proportion of 1-15:8-1 by mass ratio. The mildew preventive containing BCM is formed by combining BCM and bergenia lactone according to a certain mass ratio, has a synergistic effect on various existing mildew, can improve the inhibition effect on the mildew compared with a single mildew preventive component, is beneficial to improving the resistance of interior wall paint to external microorganisms, and ensures that the paint does not produce spoilage in production, storage and use; and secondly, the consumption of the anti-corrosion components and the anti-corrosion cost can be reduced, and the anti-corrosion agent is beneficial to protecting the life health and safety of people.

Description

Mildew preventive containing BCM

Technical Field

The invention belongs to the technical field of building coating, and particularly relates to a mildew inhibitor containing BCM.

Background

The interior wall coating is closely related to the healthy life of people, and along with the development of economy and the change of the consumption concept of people, the functional coating is increasingly deep in the life of people. The inner wall paint emulsion component contains organic matters which provide basic conditions for the growth and reproduction of microorganisms. Under proper conditions, the microbial growth and propagation can be promoted, and in the process, the enzyme, organic acid and other metabolites produced by the microorganisms can cause the changes of the smell, color, viscosity and the like of the paint, so that the product is deteriorated. In addition, mold generated by mildew of the interior wall coating can cause harm to life and health of people.

The mildew inhibitor can inhibit the growth of microorganisms, and the proper amount of the corrosion-resistant mildew inhibitor can effectively prevent the invasion of microorganisms. There are a variety of preservatives available on the market today, such as BCM, OIT, IPBC, IPN (CLT) and DCOIT. Wherein BCM is benzimidazole methyl carbamate, is a common mildew preventive, and has the following structural formula:

BCM kills or inhibits most of mold growth, is a good mold inhibitor, and has good light stability, good thermal stability and low toxicity. However, it also has certain disadvantages: as they are used for a long period of time, various microorganisms have developed resistance to them, resulting in a gradual decrease in the inhibitory effect on various mold thereof.

In the paint industry, different anti-corrosion components can be combined and compounded in different proportions, wherein the synergistic effect can improve the inhibition effect on mould, reduce the consumption and reduce the cost. CMIT/mit+fr is a very common combination formulation, which has a high-efficiency broad-spectrum bactericidal effect, but not by combining any two or more antiseptic components, a synergistic effect can be achieved.

The inventor discovers that the inhibition effect on various moulds can be improved when BCM and bergenia lactone are combined and compounded according to a certain mass ratio through an indoor synergy test, the consumption of anti-corrosion components can be reduced, the cost is reduced, and the method is beneficial to protecting the life health and safety of people.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.

Disclosure of Invention

The invention aims to provide a mildew inhibitor containing BCM, which can improve the inhibiting effect on various existing mildew, reduce the consumption of antiseptic components and the cost, and is beneficial to protecting the life health and safety of people.

In order to achieve the above purpose, the present invention provides the following technical solutions:

the novel mildew preventive for the interior wall coating is prepared from the following components in parts by weight: 20-40 parts of acrylic emulsion, 2-3.5 parts of dispersing agent, 2-4 parts of film forming agent, 1-3 parts of mildew preventive, 4-8 parts of thickening agent, 30-40 parts of filler powder, 1-1.5 parts of defoaming agent, 20-25 parts of deionized water and 0.1-0.5 part of pH regulator.

Preferably, the dispersant is a nonionic dispersant or an anionic sodium salt dispersant.

Preferably, the film forming agent is alcohol ester twelve.

Preferably, the mildew preventive is prepared from BCM and bergenia lactone according to the weight ratio of 1-15:8-1 by mass ratio.

Preferably, the thickener is HEC hydroxyethyl cellulose or an associative thickener.

Preferably, the filler powder is prepared from titanium dioxide, talcum powder and heavy calcium carbonate according to the proportion of 1:1:1.5, wherein the particle size of the filler powder is 10-20 mu m.

Preferably, the defoamer is a silicone defoamer or a mineral oil defoamer.

Preferably, the pH adjuster is dimethylethanolamine.

Compared with the prior art, the invention has the following beneficial effects:

(1) The mildew preventive for the novel interior wall coating is formed by combining and compounding BCM and bergenia lactone in a certain mass ratio, has a synergistic effect on various existing mildew, can improve the inhibition effect on the mildew compared with a single mildew preventive component, is beneficial to improving the resistance of the interior wall coating to external microorganisms, and ensures that the coating does not produce spoilage in production, storage and use; and secondly, the consumption of the anti-corrosion components can be reduced, the anti-corrosion cost can be reduced, the environmental pressure can be relieved, the environment-friendly performance is realized, and the life health safety of people can be protected.

(2) The titanium pigment in the novel inner wall paint filler powder can enable the inner wall paint to resist sun, increase whiteness and glossiness, improve the covering power of products, and is free from color change and cracking; the talcum powder plays a good smooth touch role, so that the construction performance of the product is improved, and the adhesive force of the product is improved; the heavy calcium carbonate can prevent the paint from settling, so that the paint is easy to disperse, good in construction, and high in cost performance, and the filling property and thickness of the product are increased.

(3) The novel interior wall coating adopts dimethylethanolamine as a pH regulator, and can be used as a cosolvent of the water-based coating while regulating the pH value; in addition, the alcohol ester twelve is adopted as a film forming agent, so that the minimum film forming temperature of the propylene emulsion can be effectively reduced, the paint can be conveniently and fully formed, and the performance of the paint can be better exerted.

Detailed Description

The following description of the embodiments of the present invention will be apparent from, and is intended to provide a thorough description of, the embodiments of the present invention, and not a complete description of, the embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.

In the following examples, acrylic emulsions were purchased from Hubei Xinrun chemical Co., ltd; dimethylethanolamine was purchased from Shandong Yukang chemical Co.

Example 1

A novel mildew preventive for interior wall paint is prepared from the following components: 20kg of acrylic emulsion, 2kg of nopodiaceae SN5040 dispersing agent, 2kg of Islaman alcohol ester, 1.5kg of mildew preventive, 8kg of sub-quartzite HEC hydroxyethyl cellulose, 40kg of filler powder, 1.5kg of nopodiaceae NXZ defoamer, 25kg of deionized water and 0.3kg of dimethylethanolamine, wherein the filler powder is prepared from titanium dioxide, talcum powder and heavy calcium carbonate according to a weight ratio of 1:1:1.5, wherein the particle size of the filler powder can completely pass through a sieve hole of 10 mu m; the mildew preventive is prepared from BCM and bergenia lactone according to a weight ratio of 10:1 mass ratio.

The preparation method of the interior wall coating comprises the following steps:

s1, adding deionized water into a container, mechanically stirring at a stirring speed of 300 revolutions per minute, sequentially adding a dispersing agent and 1/2 of a defoaming agent while stirring, and stirring for 10 minutes;

s2, stirring is carried out at a speed of 500 r/min, filler powder is added, and stirring is carried out for 20min;

s3, stirring at a speed of 800 rpm, slowly adding a thickening agent, stirring for 30min, and then adding a pH regulator;

s4, stirring the mixture at a speed of 1000 rpm, sequentially adding the acrylic emulsion and the film forming agent, and stirring the mixture for 15 minutes;

s5, stirring is carried out at a speed of 200 revolutions per minute, the rest 1/2 defoamer is added, and stirring is carried out for 20 minutes;

s6, adding the mildew inhibitor, and stirring for 30min to obtain the finished product of the interior wall coating.

Example 2

A novel mildew preventive for interior wall paint is prepared from the following components: 30kg of acrylic emulsion, 3kg of Nopuiday SN5040 dispersant, 4kg of Islamann alcohol ester, 1.75kg of mildew preventive, 8kg of sub-quart HEC hydroxyethyl cellulose, 35kg of filler powder, 1.5kg of Nopuiday NXZ defoamer, 25kg of deionized water and 0.5kg of dimethylethanolamine; wherein, the filler powder is prepared from titanium dioxide, talcum powder and heavy calcium carbonate according to the proportion of 1:1:1.5, wherein the particle size of the filler powder can completely pass through a sieve hole of 15 mu m; the mildew preventive is prepared from BCM and bergenia lactone according to a weight ratio of 10:1 mass ratio.

The preparation method is the same as in example 1.

Example 3: synergistic test of BCM and bergenia lactone

1. Test mould

Aspergillus niger (Aspergillus niger) numbering: ATCC16404,

Penicillium citrinum (Penicillium citrium) number: ATCC14994

Aspergillus flavus (Aspergillus flavus) numbering: AS3.3950

Paecilomyces variotii (Paecilomyces variotii) number: AS3.776

Stored on PDA medium for further use.

2. Test agent: 98% BCM (Anhui Guangxi Agrochemical Co., ltd.) and 98.8% bergenin (Shanghai incorporated pharmaceutical technology development Co., ltd.)

3. Dissolving dimethyl sulfoxide for each crude drug, preparing the dissolved BCM and bergenin into single-dose mother solution by using 0.1% Tween-80 aqueous solution, setting a plurality of groups of proportions, diluting each single dose and each group of proportions into 5 mass concentration gradients by using 0.1% Tween-80 aqueous solution according to an equal ratio method for standby.

4. The test method comprises the following steps: hypha growth rate method (Mu Liyi 1994)

1mL of the test agent was mixed with 9mL of melted PDA medium and poured into a sterile petri dish to prepare a medicated plate. After the culture medium had solidified, 1 mould cake (diameter 5 mm) was placed in the centre of the drug-containing plate and 3 replicates were set per treatment with 0.1% tween-80 in water as control. Placing the strain into an incubator, culturing for 3d at 28+/-1 ℃, measuring the growth diameter of the mould colony by using a crisscross method, and calculating the inhibition rate.

5. Data analysis

Regression analysis is carried out on the test agent concentration logarithmic value and the hypha growth inhibition rate probability value by DPS software, and the EC of each treatment agent is calculated ₅₀ And the synergy was evaluated according to the Wadley method.

SR is more than or equal to 1.5, has synergistic effect; SR < 0.5 represents antagonism; 0.5 < SR < 1.5 indicates that the additive effect is achieved, and the results are shown in tables 1-5.

TABLE 1 toxicity of BCM (A) and bergenin (B) to Aspergillus niger (Aspergillus niger)

As can be seen from table 1, BCM and bergenin are between 1 and 15: the synergy coefficient of the aspergillus niger (Aspergillus niger) within the mass ratio range of 8-1 is more than 1.5, and the synergy is shown.

TABLE 2 toxicity of BCM (A) and bergenin (B) compounded against Penicillium citrinum (Penicillium citrium)

As can be seen from table 2, BCM and bergenin are between 1 and 15: the synergistic coefficient of the penicillium citrinum (Penicillium citrium) in the mass ratio range of 8-1 is more than 1.5, and the synergy is shown.

TABLE 3 toxicity of BCM (A) and bergenin (B) compounded on Aspergillus flavus (Aspergillus flavus)

As can be seen from table 3, BCM and bergenin are between 1 and 15: the synergy coefficient of the aspergillus flavus (Aspergillus flavus) within the mass ratio range of 8-1 is more than 1.5, and the synergy is shown.

TABLE 4 toxicity of BCM (A) and bergenin (B) compounded Paecilomyces variotii (Paecilomyces variotii)

As can be seen from table 4, BCM and bergenin are between 1 and 5: the synergy coefficient of paecilomyces variotii (Paecilomyces variotii) in the mass ratio range of 30-1 is more than 1.5, and the synergy is shown.

In conclusion, when BCM and bergenia lactone are combined for use, the synergistic effect is shown on a plurality of moulds such as Aspergillus niger (Aspergillus niger), penicillium citrinum (Penicillium citrium), aspergillus flavus (Aspergillus flavus), paecilomyces varioti (Paecilomyces variotii) and the like, compared with a single mould-proof component, the inhibition effect on moulds can be improved, the resistance of the interior wall coating to external microorganisms can be improved, and the production, storage and use of the coating are ensured without spoilage; and secondly, the consumption of the anti-corrosion components and the anti-corrosion cost can be reduced, and the anti-corrosion agent is beneficial to protecting the life health and safety of people.

The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims

1. A mildew preventive containing BCM is characterized in that the active ingredients of the mildew preventive are prepared from BCM and bergenia lactone according to the proportion of 1-15:8-1 by mass ratio.