CN112480799B

CN112480799B - Method for controlling formaldehyde release rate by controlling water content of artificial board

Info

Publication number: CN112480799B
Application number: CN202011307666.3A
Authority: CN
Inventors: 仇印; 祝海洋; 文亚丽; 落志祯; 李红
Original assignee: Chongqing Huijie Environmental Protection Technology Co ltd
Current assignee: Chongqing Huijie Environmental Protection Technology Co ltd
Priority date: 2020-11-19
Filing date: 2020-11-19
Publication date: 2022-09-20
Anticipated expiration: 2040-11-19
Also published as: CN112480799A

Abstract

The invention discloses a method for controlling formaldehyde release rate by controlling water content of an artificial board, and relates to the technical field of building material environmental protection. The invention comprises an artificial board formaldehyde-proof coating, which comprises the following components, by weight, 5-20 parts of a leveling agent, 10-30 parts of a penetrating agent, 25-30 parts of a hydrophobic agent, 5-100 parts of carbomer 940 resin, 5-50 parts of a curing agent, and 950 parts of deionized water 770; the aim of effectively controlling harmful substances such as stable and unstable urea-formaldehyde resin in the decoration material is achieved by controlling the water content of the artificial board to control the formaldehyde release rate.

Description

Method for controlling formaldehyde release rate by controlling water content of artificial board

The technical field is as follows:

the invention relates to the technical field of building material environmental protection, in particular to a method for controlling formaldehyde release rate by controlling the water content of an artificial board.

Background art:

along with the development of economy, the living standard of people is improved, the living facilities of the people are complete, the quality requirements of the facilities are improved, and the air quality of the rooms is also concerned by people. In a household environment, a large amount of decoration materials such as artificial boards, wooden furniture and the like have great hidden dangers to human health caused by the release of volatile harmful gases into the external environment. Aiming at harmful gases released by decoration materials such as artificial boards, wooden furniture and the like, more treatment technologies and methods are available, such as modification and upgrading of adhesives used by the decoration materials; indoor environment harmful gas scavenger, closed air purifier, photocatalyst and air freshener; installing a new fan; and removing, preventing and controlling harmful gases in the room by window opening ventilation, planting green plants and other methods when the new house is decorated.

A plurality of air purifiers and air treatment auxiliaries exist in the existing market, and researches show that the existing air purifiers with correlation have the following problems, firstly, the closed air purifiers only play a certain role in preventing and controlling unstable volatile harmful gases of urea-formaldehyde resin; secondly, the sealant contains a large amount of volatile harmful gas; thirdly, part of the plant essential oil is used for covering, and the sense of harmful gases such as formaldehyde and the like is covered with low timeliness; fourth, the formaldehyde scavenger can only briefly react the harmful formaldehyde gas emitted from the indoor environment.

The invention content is as follows:

the invention aims to provide a method for controlling the release rate of formaldehyde by controlling the water content of an artificial board so as to effectively control harmful substances such as stable and unstable urea-formaldehyde resin and the like in a decoration material.

In order to achieve the purpose, the invention adopts the following technical means:

an artificial board formaldehyde-proof coating comprises, by weight, 5-20 parts of a leveling agent, 10-30 parts of a penetrating agent, 25-30 parts of a hydrophobing agent, 5-100 parts of carbomer 940 resin, 5-50 parts of a curing agent, and 950 parts of deionized water 770-plus.

Preferably, the formaldehyde-proof paint is prepared by mixing at normal temperature and normal pressure.

Further, the hydrophobic agent comprises any one of methyl potassium silicate, methyl sodium silicate and fluorinated polyurethane.

Further, the leveling agent is polyurethane.

Further, the penetrant comprises any one of sodium alkyl alcohol sulfate and sodium alkyl sulfonate.

Further, the curing agent includes any one of dipropylene glycol methyl ether and dipropylene glycol butyl ether.

Furthermore, the material comprises, by weight, 1-5 parts of boric acid and 5-10 parts of chitosan.

The artificial board formaldehyde-proof coating provided by the invention has the following beneficial effects:

the hydrophobic property of the decorative materials such as wooden furniture and floors can be improved, the board fiber has high-efficiency hydrophobic property and does not absorb moisture in the air and outside any more, so that the release rate of formaldehyde is reduced by reducing the humidity of the board, and even the harm of volatile harmful gas in the decorative materials to human bodies is eliminated. The paint provided by the invention is harmless to human bodies, and has certain waterproof and mildewproof effects. The use is simple and quick, and the effect is obvious. The material is stable and efficient, and has no secondary pollution.

Meanwhile, the application also provides a coating method of the artificial board formaldehyde-proof coating, so that the formaldehyde released by the artificial board is further isolated and removed, and the aim of avoiding the release of the formaldehyde into the air to the maximum extent to cause more formaldehyde in the indoor air is fulfilled.

In order to achieve the purpose, the invention adopts the following technical means: a coating method of an artificial board formaldehyde-proof coating comprises the following steps:

(1) preparing raw materials:

mixing the flatting agent, the penetrating agent and the hydrophobic agent in parts by weight to prepare a mixture A;

mixing carbomer 940 resin, a curing agent and deionized water to prepare a mixture B;

adding the mixture B into the mixture A under the stirring state to prepare a surface protection coating;

(2) preparing a base layer coating:

the base layer for coating the surface of the artificial board comprises epoxy resin and a cardanol curing agent, and is used for adhering boric acid and chitosan;

(3) coating a functional layer of a substrate: mixing boric acid and chitosan, grinding the mixture into mixed powder, adding the mixed powder into a substrate layer coating to prepare a substrate composite coating, wherein the use amount of the mixed powder accounts for 1% of the weight of the substrate layer coating;

coating the substrate composite coating on the surface of the artificial board;

(4) surface coating:

and after the substrate functional layer is cured, covering the surface protective coating on the substrate functional layer in a high-pressure spraying mode to form a surface protective layer.

The formaldehyde-proof coating is coated on the surface of the artificial board to form a coating on the surface of the artificial board, and the formaldehyde release of the artificial board is controlled by controlling the water content in the artificial board.

The coating preparation and coating by the coating method disclosed by the invention have the following beneficial effects:

the final coating that forms on the wood-based plate surface includes two-layerly, the basement functional layer of laminating with the wood-based plate and the surface protection layer of coating at basement functional layer top surface, it is specific, the surface protection layer is used for outmost protection, carry out waterproof operation promptly, avoid moisture in the air quick with wood-based plate surface contact, and then can be the longer time keep apart with the external world to the plate body of artificial board, avoid the moisture in the outside air and the surface contact of wood-based plate, and then reduce the formaldehyde that the wood-based plate gived off through the moisture content of control wood-based plate. And a substrate functional layer is arranged between the inner side of the surface protective layer and the surface of the artificial board, the substrate functional layer is formed by curing epoxy resin, because of the long chain structure of cardanol, the epoxy resin can have a better three-dimensional net structure after being cured, and further the toughness of the cured epoxy resin is better and more important, mixed fillers of boric acid and chitosan are uniformly dispersed in the cured substrate functional layer and always keep the original state, so that even if the surface coating of the whole artificial board is used for a long time or in a high-humidity environment, part of external water vapor is immersed from the surface protective layer and simultaneously contacts with the surface of the artificial board through the substrate functional layer to increase the moisture on the surface of the artificial board, and when the release of formaldehyde is accelerated, water penetrates through the substrate functional layer in the process of penetrating through the substrate functional layer, therefore, a microcosmic wet environment is formed inside the substrate functional layer, and meanwhile, the whole microcosmic environment is acidic due to the existence of boric acid, so that formaldehyde can react with chitosan in an acidic environment when permeating through the substrate functional layer, and the formaldehyde is taken as a crosslinking agent for crosslinking chitosan, so that the formaldehyde is removed through the crosslinking reaction of the chitosan, and the formaldehyde is prevented from being greatly permeated from the substrate functional layer. Simultaneously, at the long-time crosslinked in-process of chitosan, the volume of single chitosan can increase gradually, and then lets the more closely knit of whole base functional layer itself to it is better to let the individual effect of renting of base functional layer.

The specific implementation mode is as follows:

implementation example:

in order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings. The components of embodiments of the present invention generally described and illustrated herein may be arranged and designed in a wide variety of different configurations.

Thus, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on line of sight, or orientations or positional relationships that are conventionally placed when the product of the present invention is used, or orientations or positional relationships that are conventionally understood by those skilled in the art, which are merely for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

An artificial board formaldehyde-proof coating comprises the following components, by weight, a leveling agent, a penetrating agent, a hydrophobing agent, carbomer 940 resin, a curing agent and deionized water.

The formaldehyde-proof paint is prepared by mixing at normal temperature and normal pressure.

Meanwhile, the hydrophobic agent comprises any one of methyl potassium silicate, methyl sodium silicate and fluorinated polyurethane.

And moreover, the leveling agent is polyurethane.

And the penetrant comprises any one of sodium alkyl alcohol sulfate and sodium alkyl sulfonate.

The curing agent comprises any one of dipropylene glycol methyl ether and dipropylene glycol butyl ether.

When in preparation, firstly, the flatting agent, the penetrating agent and the hydrophobic agent are added into a container A, the raw materials are fully mixed by stirring, then the resin and the curing agent are added into a container B containing deionized water according to the proportion, the mixture is fully oscillated and mixed, finally, the solution in the container A is poured into the container B, the solution is slightly stirred to prepare the coating, and then the coating is sprayed on the artificial board by a high-pressure spraying mode.

And further the formaldehyde release rate can be controlled by controlling the water content of the artificial board.

The effects of the examples were examined by different experimental examples and comparative examples.

Experimental example 1

In this experimental example, the raw materials were mixed in the following weight parts of 5 parts of polyurethane, 5 parts of sodium alkylol sulfate or sodium alkylsulfonate, 10 parts of methyl potassium silicate or sodium methyl silicate or fluorinated polyurethane, 5 parts of carbomer 940 resin, 5 parts of dipropylene glycol methyl ether or dipropylene glycol butyl ether, and 950 parts of deionized water.

And (3) coating the coating on an artificial board to obtain a sample.

Experimental example 2

In the experimental example, the raw materials were mixed in the following weight parts of 12 parts of polyurethane, 20 parts of sodium alkylol sulfate or sodium alkylsulfonate, 27 parts of potassium methyl silicate or sodium methyl silicate or fluorinated polyurethane, 50 parts of carbomer 940 resin, 25 parts of dipropylene glycol methyl ether or dipropylene glycol butyl ether, and 850 parts of deionized water.

And (3) coating the coating on an artificial board to obtain a sample.

Experimental example 3

In this experimental example, the raw materials were mixed in the following weight parts of polyurethane 20 parts, sodium alkylol sulfate or sodium alkylsulfonate 30 parts, 30 parts of methyl potassium silicate or sodium methyl silicate or fluorinated polyurethane, 100 parts of carbomer 940 resin, 50 parts of dipropylene glycol methyl ether or dipropylene glycol butyl ether, and 770 parts of deionized water.

And (3) coating the coating on an artificial board to obtain a sample.

Comparative example 1

The original artificial board was used as a comparative sample.

The specific test mode is as follows:

the experiment tests show that the material of the invention can control the moisture content of the wooden board by carrying out detection experiments on the wooden board made of three materials of shaving board, density board and plywood, respectively taking 16 boards with the size of 4x4x1cm, and detecting the weight change of the boards by changing the humidity change of the environment in a glass experiment cabinet. The experimental steps are as follows: under specific four environments with different humidities of 60%, 70%, 80% and 90%, a blank group without the material and three groups of parallel experiment groups using the material are detected for comparison and recording, and the material can be proved to have the effect of controlling the water content of the plate according to the relation between the water content and the weight change of the plate.

Table 1 shows the effect comparison as follows:

as can be seen from table 1, after the coating material according to the present embodiment is applied, it has very good water-blocking ability to the environment, and after the coating material of the present application is applied, there is almost no weight variation of the internal artificial board under high humidity environment, which indicates that the soil layer is only a small part of water soaked, and the weight variation is fluctuation of the measurement error, so the soil layer is spread too irregularly.

After the waterproof effect is tested, the formaldehyde emission of three boards, namely a shaving board, a density board and a plywood, is detected. The results are shown in table 2, as follows:

from table 2, it can be seen that the formaldehyde emission after the coating of the present embodiment is far lower than the limit value of the national standard method, and the formaldehyde removing effect is greatly increased.

Example 2

An artificial board formaldehyde-proof coating comprises the following components of a leveling agent, a penetrating agent, a hydrophobic agent, carbomer 940 resin, a curing agent, deionized water, boric acid and chitosan.

The formaldehyde-proof coating is prepared at normal temperature and normal pressure.

And moreover, the leveling agent is polyurethane.

The following methods were used for both deployment and coating:

(1) preparing raw materials:

(2) preparing a base layer coating:

(3) coating a functional layer of a substrate:

mixing boric acid and chitosan, grinding the mixture into mixed powder, adding the mixed powder into a substrate layer coating to prepare a substrate composite coating, wherein the use amount of the mixed powder accounts for 1% of the weight of the substrate layer coating;

coating the substrate composite coating on the surface of the artificial board, wherein the thickness of the coating is not more than 20 micrometers;

(4) surface coating:

and after the substrate functional layer is cured, covering the surface protection coating on the substrate functional layer by using a high-pressure spraying mode to form a surface protection layer, wherein the total film thickness of the substrate functional layer and the surface protection layer is not more than 40 mu m.

Experimental example 1

In the experimental example, the following raw materials in parts by weight were taken: 5 parts of polyurethane, 5 parts of sodium alkyl alcohol sulfate or sodium alkyl sulfonate, 10 parts of methyl potassium silicate or sodium methyl silicate or fluorinated polyurethane, 5 parts of carbomer 940 resin, 5 parts of dipropylene glycol methyl ether or dipropylene glycol butyl ether, 950 parts of deionized water, 1 part of boric acid and 5 parts of chitosan.

And (3) coating the coating on an artificial board to obtain a sample.

Experimental example 2

In the experimental example, the following raw materials in parts by weight were taken: 12 parts of polyurethane, 20 parts of sodium alkyl sulfate or sodium alkyl sulfonate, 27 parts of methyl potassium silicate or sodium methyl silicate or fluorinated polyurethane, 50 parts of carbomer 940 resin, 25 parts of dipropylene glycol methyl ether or dipropylene glycol butyl ether, 850 parts of deionized water, 3 parts of boric acid and 6 parts of chitosan.

And (3) coating the coating on an artificial board to obtain a sample.

Experimental example 3

In this experimental example, the raw materials were mixed in the following weight parts of polyurethane 20 parts, sodium alkylol sulfate or sodium alkylsulfonate 30 parts, 30 parts of methyl potassium silicate or sodium methyl silicate or fluorinated polyurethane, 100 parts of carbomer 940 resin, 50 parts of dipropylene glycol methyl ether or dipropylene glycol butyl ether, 770 parts of deionized water, 5 parts of boric acid, and 10 parts of chitosan.

And (3) coating the coating on an artificial board to obtain a sample.

Comparative example 1

The original wood-based board was used as a comparative sample.

The specific test mode is as follows:

the experiment tests show that the material of the invention can control the moisture content of the wooden board by carrying out detection experiments on the wooden board made of three materials of shaving board, density board and plywood, respectively taking 16 boards with the size of 4x4x1cm, and detecting the weight change of the boards by changing the humidity change of the environment in a glass experiment cabinet. The experimental steps are as follows: under specific four environments with different humidities of 60%, 70%, 80% and 90%, comparison and recording are carried out by detecting a blank group without the material and three groups of parallel experiment groups with the material, and according to the relation between the water content and the weight change of the plate, the material can be proved to have the effect of controlling the water content of the plate.

The results are shown in table 3, as follows:

as can be seen from table 3, after the coating material according to the present example is applied, it has a very good ability to block moisture in the environment, and compared with the effects of the foregoing example 1 and the common board, after the coating material of the present example is applied, there is almost no weight variation of the artificial board inside under a high humidity environment, which indicates that substantially no moisture is impregnated into the coating layer, and the weight variation is a fluctuation of the measurement error.

After the waterproof effect is tested, the formaldehyde emission of three boards, namely a shaving board, a density board and a plywood, is detected. The results are shown in Table 4, as follows:

from table 4, it can be seen that the formaldehyde emission after the coating of the present example is far lower than the limit value of the national standard method, and the formaldehyde removing effect is greatly increased.

Meanwhile, the situation that the microcosmic volume of the chitosan is increased after long-time crosslinking in a classroom in the process of long-time storage in the environment is simulated according to the addition amount of different chitosan. Boric acid and chitosan in different weight parts are added into a curing system of epoxy resin and cardanol or ethylenediamine as fillers, after the epoxy resin and cardanol or ethylenediamine are cured into a film, the cured film is immersed into a formaldehyde solution and soaked, and the effect under extreme conditions is simulated.

The specific results are shown in table 5 below:

from the results in table 5, it was analyzed that the toughness of the epoxy resin in the late stage of curing can be effectively improved by cardanol as a curing agent. Even if chitosan with a little amount of tannin is used as a filler, and formaldehyde is used as a cross-linking agent to perform cross-linking in an acidic environment, the cardanol is used as a curing agent to avoid cracking of the coating after the volume of the chitosan is increased, compared with common epoxy resin curing agent ethylenediamine, the coating which covers the surface of the artificial board can have a longer service life, and the coating has better durability.

Furthermore, combining the coatings of the foregoing examples 1 and 2, the effect of eliminating formaldehyde by the coating, that is, preventing residual formaldehyde in the artificial board from being discharged into the environment, is better after the chitosan and boric acid are added. And the effects of 0 injury to indoor human bodies and 0 formaldehyde release can be basically achieved by combining with the indoor normal ventilation environment.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims

1. An artificial board formaldehyde-proof coating is characterized in that: the adhesive comprises the following components, by weight, 5-20 parts of a leveling agent, 10-30 parts of a penetrating agent, 25-30 parts of a hydrophobic agent, 5-100 parts of carbomer 940 resin, 5-50 parts of a curing agent and 950 parts of deionized water 770-doped materials;

also comprises the following raw materials, by weight, 1-5 parts of boric acid and 5-10 parts of chitosan;

the preparation method of the coating comprises the following steps:

(1) preparing raw materials:

(2) preparing a base layer coating:

(3) coating a functional layer of a substrate:

mixing boric acid and chitosan, grinding the mixture into mixed powder, adding the mixed powder into the substrate layer coating to prepare a substrate composite coating, wherein the use amount of the mixed powder accounts for 1% of the weight of the substrate layer coating;

coating the substrate composite coating on the surface of the artificial board to form a substrate functional layer;

(4) surface coating:

after the substrate functional layer is cured, covering the surface protective coating on the substrate functional layer in a high-pressure spraying mode to form a surface protective layer;

the leveling agent is polyurethane.

2. The artificial board formaldehyde-proof coating according to claim 1, characterized in that: the formaldehyde-proof coating is prepared by mixing at normal temperature and normal pressure.

3. The artificial board formaldehyde-proof coating according to claim 1, characterized in that: the hydrophobic agent comprises any one of methyl potassium silicate, methyl sodium silicate and fluorinated polyurethane.

4. The artificial board formaldehyde-proof coating according to claim 1, characterized in that: the penetrant comprises any one of sodium alkyl alcohol sulfate and sodium alkyl sulfonate.

5. The artificial board formaldehyde-proof coating according to claim 1, characterized in that: the curing agent comprises any one of dipropylene glycol methyl ether and dipropylene glycol butyl ether.

6. A method for controlling the release rate of formaldehyde by controlling the water content of an artificial board is characterized in that: the coating is carried out by using the formaldehyde-proof coating of any one of claims 1 to 5, the formaldehyde-proof coating is coated on the surface of the artificial board, a coating is formed on the surface of the artificial board, and the formaldehyde release of the artificial board is controlled by controlling the water content in the artificial board.