阅读说明：本技术 一种碳化转印制品的制备方法 (Preparation method of carbonized transfer-printed product ) 是由 张运华 张志鹏 徐子萌 汪卿 于 2021-08-10 设计创作，主要内容包括：本发明公开了一种碳化转印制品的制备方法,属于氢氧钙石碳化领域。本发明方法包括以下步骤：通过压制成型制作碳化坯体；通过丝网印刷将封闭剂按设计图案印在坯体上,所述的封闭剂主要由聚丙烯酰胺、聚氧化乙烯和水组成；对印刷图案的坯体进行碳化养护；将碳化后的坯体取出后用高压水枪冲洗,得到碳化转印制品。本发明工艺简单、成本低廉,可得到图案精细的碳化转印制品。(The invention discloses a preparation method of a carbonized transfer-printed product, and belongs to the field of portlandite carbonization. The method comprises the following steps: preparing a carbonized blank body by pressing and molding; printing a sealing agent on the blank body according to a design pattern by screen printing, wherein the sealing agent mainly comprises polyacrylamide, polyoxyethylene and water; carbonizing and curing the blank body with the printed pattern; and taking out the carbonized blank, and washing the blank by using a high-pressure water gun to obtain the carbonized transfer product. The invention has simple process and low cost, and can obtain the carbonized transfer printing product with fine patterns.)

1. A preparation method of a carbonized transfer-printed product is characterized by comprising the following steps:

a. preparing a carbonized blank body by pressing and molding;

b. printing a sealing agent on the blank body according to a design pattern by screen printing, wherein the sealing agent mainly comprises polyacrylamide, polyoxyethylene and water;

c. carrying out accelerated carbonization curing on the blank body with the printed pattern;

d. and taking out the carbonized sample, and washing the sample by using a high-pressure water gun to obtain the carbonized transfer product.

2. The method of producing a carbonized transfer article according to claim 1, which isIs characterized in that: in the step a, the raw material composition of the carbonized green body comprises one or more of the following components: ca (OH)₂、Mg(OH)₂、β-C₂S、γ-C₂S、C₃S。

3. The method of producing a carbonized transfer article according to claim 1, characterized in that: in the step a, the thickness of the carbonized green body is more than or equal to 5 mm.

4. The method of producing a carbonized transfer article according to claim 1, characterized in that: in the step a, the skeleton porosity of the carbonized green body is less than or equal to 0.5.

5. The method of producing a carbonized transfer article according to claim 1, characterized in that: in the step b, the sealant mainly comprises the following components in parts by mass: 2-5 parts of polyacrylamide, 2-5 parts of polyoxyethylene and 90-96 parts of water.

6. The method of producing a carbonized transfer article according to claim 1, characterized in that: in the step b, the penetration depth of the sealant into the blank body is 1-2 mm.

7. The method of producing a carbonized transfer article according to claim 1, characterized in that: in the step b, the sealing agent is penetrated into the blank body to a depth of 1-2 mm by repeating screen printing for multiple times.

8. The method of producing a carbonized transfer article according to claim 1, characterized in that: in step c, said carbonized CO₂Concentration not less than 20%, CO₂The pressure is 0.1-0.4 MPa.

9. The method of producing a carbonized transfer article according to claim 1, characterized in that: in the step c, the carbonization curing time is 2-10 hours.

Technical Field

The invention relates to the field of portlandite carbonization, in particular to a preparation method of a carbonized transfer product.

Background

With the rapid development of countries, the emission amount of carbon dioxide is increasing, thereby causing serious social and environmental problems. In addition, at present, the main building facade decoration materials in China are ceramic tiles, and the ceramic tiles have the defects of insufficient durability, easy falling, monotonous patterns and the like, and should be replaced by more excellent decoration materials.

The transfer concrete is a decorative concrete which forms a pattern by exposing aggregates on a pattern part on the surface of the concrete through a retarding technology. The transfer printing concrete is characterized in that the patterns are fine and complex and can be changed at will, and compared with common decorative materials, the transfer printing concrete can create a space for architectural designers greatly and achieve a good artistic effect. Therefore, the transfer concrete is developed more and more rapidly, and the application range is wider and wider.

However, the color contrast of the transfer concrete is not obvious enough, and the problems of easy occurrence of color difference and the like are prominent. Carbonized articles can solve such problems. Most of the carbonized products are white, and the color contrast is very obvious compared with the black aggregate in the carbonized products. The carbonized product does not have the problems of efflorescence, color difference and the like of concrete. However, the transfer technology of the carbonized product is not mentioned in the literature at present.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a preparation method of a carbonization transfer printing product, which has the advantages of simple process, low cost, no chromatic aberration and capability of realizing a carbon fixation effect.

Aiming at the problems in the background art, the inventor finds that the strength of the carbonized green body is greatly improved in the curing process through a large amount of researches. If a small amount of liquid substance is coated on the surface of the green body before carbonization curing, the liquid substance will penetrate into the green body and block the pores thereof, making it difficult for carbon dioxide to enter the part, preventing carbonization of the part. If the surface tension and the total amount of the liquid substance are properly controlled, the penetration range of the liquid substance can be finely controlled. The invention skillfully utilizes the principle, adopts the screen printing technology and controls the screen printing times to control the coating amount of the sealing agent, and simultaneously utilizes the polyacrylamide and the polyoxyethylene to adjust the surface tension of the sealing agent, so that the surface tension value is in a certain range, and further, the depth of the sealing agent penetrating into the carbonized green body is accurately adjusted, and the partial green body is hindered from being carbonized. And then flushing the surface of the carbide by using a high-pressure water gun to peel off the part with low strength to form a pattern. The method specifically comprises the steps of sealing a part of the area of the green body by using a sealing agent containing polyacrylamide and polyethylene oxide, then carbonizing, wherein in the carbonization process, the part which is not sealed by the sealing agent is normally carbonized, and the part which is sealed by the sealing agent is hindered in carbonization due to slow penetration of carbon dioxide and has low strength. At this time, the carbonized body is flushed by a high-pressure water gun, and the part with lower strength is flushed down to be peeled off, so that a pattern is formed.

The purpose of the invention is realized by the following technical scheme:

a method for preparing a carbonized transfer-printed product comprises the following steps:

a. and (4) preparing a carbonized green body by pressing and molding.

b. And printing a sealant on the blank body according to a designed pattern by screen printing, wherein the sealant mainly comprises polyacrylamide, polyethylene oxide and water.

c. And carrying out accelerated carbonization curing on the blank body with the printed pattern.

d. And taking out the carbonized sample, and washing the sample by using a high-pressure water gun to obtain a carbonized body with a transfer printing pattern, thus obtaining the carbonized transfer printing product.

In the step a, the raw material composition of the carbonized green body comprises one or more of the following components: ca (OH)₂、Mg(OH)₂、β-C₂S、γ-C₂S、C₃And S. Because the five substances have higher carbonization strength, the carbonized sample can bear the washing of a water gun.

In the step a, the thickness of the carbonized green body is preferably more than or equal to 5 mm. Too small a thickness of the carbonized body will result in the carbonized body being flushed through by a water gun, since the thickness of the carbonized body that is eroded by the water gun may reach 3 mm.

In the step a, the framework porosity of the carbonized green body is preferably less than or equal to 0.5. Too large a skeleton porosity of the carbonized green body will result in too many pores and too large a pore diameter of the green body, too large a penetration range and depth of the sealant, and finally result in too large a pattern of the carbonized product and difficulty in presenting the designed pattern.

In the step b, the sealant preferably mainly comprises the following components in parts by mass: 2-5 parts of polyacrylamide, 2-5 parts of polyoxyethylene and 90-96 parts of water. Too large polyacrylamide ratio can cause too large surface tension of the sealing agent, the sealing agent is difficult to permeate into a blank body, and a pattern cannot be formed; too little polyacrylamide ratio will result in too little surface tension of the blocking agent, too great penetration range and depth of the blocking agent, and eventually pattern spreading. Too large polyethylene oxide ratio can cause too large surface tension of the sealing agent, the sealing agent is difficult to permeate into a blank body, and a pattern cannot be formed; too little polyethylene oxide will result in too little surface tension of the blocking agent, too great penetration range and depth of the blocking agent, and ultimately, pattern spreading.

In the step b, the silk-screen printing can be repeated for many times, so that the depth of the sealing agent penetrating into the carbonized blank body is ensured to be 1-2 mm. The penetration depth is too small, so that the area flushed by the water gun is too small, the contrast of the pattern is not clear enough, and the pattern is difficult to distinguish; too great a penetration depth will result in too large an area being washed down by the water gun and the carbonized sample being destroyed.

In the step c, the cured CO is carbonized₂Concentration is preferably not less than 20%, CO₂The pressure is preferably 0.1 to 0.4 MPa. CO 2₂Too low a concentration or CO₂Too low a pressure results in slow carbonization of the green body, too low a strength and finally no pattern formation. CO 2₂Too big results in the outside carbonization of body too fast, and the hole is blockked up to the carbonization product that forms, and inside carbon dioxide can't get into the body, finally lead to internal strength not enough, can't form meticulous pattern when being washed by the squirt.

In the step c, the carbonization curing time is preferably 2-10 hours. The carbonization curing time is too short, so that the green body cannot be normally carbonized, and the pattern of a carbonized product is deformed due to the fact that the green body cannot bear the pressure of a water gun; too long curing time will result in too sufficient carbon dioxide penetration, and the enclosed area will also carbonize normally and fail to show the pattern.

A carbonized transfer-printed product obtained by the preparation method.

In conclusion, the method is simple and low in cost, and the transfer printing carbonized product prepared by the method has fine patterns.

Detailed Description

The following examples are intended to further illustrate the invention but should not be construed as limiting it. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art.

A method for preparing a carbonized transfer-printed product comprises the following steps:

a. and (4) preparing a carbonized green body by pressing and molding.

b. Printing a sealing agent on the blank according to a design pattern by screen printing, wherein the sealing agent comprises the following components: 2-5 parts of polyacrylamide, 2-5 parts of polyoxyethylene and 90-96 parts of water.

c. And carrying out accelerated carbonization curing on the blank body with the printed pattern.

d. And taking out the carbonized sample, and washing the sample by using a high-pressure water gun to obtain a carbonized body with a transfer printing pattern, thus obtaining the carbonized transfer printing product.

The parameters and effects of examples 1 to 4 and comparative examples 5 to 18 using the above method are detailed in tables 1 and 2.

TABLE 1 examples

Table 2 comparative example

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.