阅读说明：本技术 一种多层丝网印刷多色调转印混凝土碳化制品的制备方法 (Preparation method of multi-layer silk-screen printing multi-tone transfer concrete carbonized product ) 是由 张运华 张志鹏 曹泽杰 汪卿 于 2021-08-10 设计创作，主要内容包括：本发明公开了一种多层丝网印刷多色调转印混凝土碳化制品的制备方法,属于多色调转印混凝土碳化领域。本发明方法包括以下步骤：根据设计图案的需要将氢氧化钙粉末染成不同颜色；制作转印混凝土,转印图案的凹槽深度≥0.5mm；根据设计图案制作不同的丝印网版,一种丝印网版对应一种图案颜色；通过不同的丝印网版将不同颜色的氢氧化钙粉末印在含1/4～1/3水的转印图案凹槽上并将凹槽填平,并使氢氧化钙粉末密实,静置一段时间；对转印制品进行常压碳化养护,得到所述的多色调转印混凝土碳化制品。本发明工艺简单、成本低廉,可得到多色调、图案精细的转印混凝土碳化制品。(The invention discloses a preparation method of a multi-layer screen printing multi-tone transfer concrete carbonization product, belonging to the field of multi-tone transfer concrete carbonization. The method comprises the following steps: dyeing calcium hydroxide powder into different colors according to the requirement of design patterns; manufacturing transfer concrete, wherein the depth of a groove of a transfer pattern is more than or equal to 0.5 mm; manufacturing different silk-screen printing plates according to the design patterns, wherein one silk-screen printing plate corresponds to one pattern color; calcium hydroxide powder with different colors is printed on a transfer pattern groove containing 1/4-1/3 water through different screen printing plates, the groove is filled, the calcium hydroxide powder is compacted, and the calcium hydroxide powder is placed for a period of time; and carrying out normal-pressure carbonization curing on the rotary printed product to obtain the multicolor transfer-printed concrete carbonized product. The invention has simple process and low cost, and can obtain the transfer-printed concrete carbonized product with multi-tone and fine patterns.)

1. A preparation method of a multi-layer screen printing multi-tone transfer printing concrete carbonized product is characterized by comprising the following steps:

a. dyeing calcium hydroxide powder into different colors according to the requirement of design patterns;

b. manufacturing transfer concrete, wherein the depth of a groove of a transfer pattern is more than or equal to 0.5 mm;

c. manufacturing different silk-screen printing plates according to the design patterns, wherein one silk-screen printing plate corresponds to one pattern color;

d. calcium hydroxide powder with different colors is printed on a transfer pattern groove containing 1/4-1/3 water through different screen printing plates, the groove is filled, the calcium hydroxide powder is compacted, and the calcium hydroxide powder is placed for a period of time;

e. and carbonizing and curing the rotary printed product at normal temperature and normal pressure to obtain the multicolor transfer-printed concrete carbonized product.

2. The method for producing a multi-tone transfer concrete carbonized article according to claim 1, characterized in that: in the step a, the maximum particle size of the calcium hydroxide powder is less than 75 μm.

3. The method for producing a multi-tone transfer concrete carbonized article according to claim 1, characterized in that: in the step a, calcium hydroxide powder is dyed into different colors by using pigments; the pigment is one or more of iron oxide, lead chromate, chromium oxide and the like.

4. The method for producing a multi-tone transfer concrete carbonized article according to claim 3, wherein: the method for dyeing the calcium hydroxide powder by using the iron oxide pigment comprises the following steps: and (3) immersing calcium hydroxide powder into the pigment, stirring, completely coloring, and drying for later use.

5. The method for producing a multi-tone transfer concrete carbonized article according to claim 1, characterized in that: in the step b, the preparation of the transfer concrete comprises the following steps: printing the retarder on a PVC film according to a design pattern, pouring concrete on the PVC film, tearing the PVC film after curing until the strength is greater than 5MPa, and flushing the surface of the concrete by using a high-pressure water gun to obtain the transfer concrete.

6. The method for producing a multi-tone transfer concrete carbonized article according to claim 1, characterized in that: in the step c, the aperture of the silk-screen printing plate is larger than 100 μm.

7. The method for producing a multi-tone transfer concrete carbonized article according to claim 1, characterized in that: and d, blowing the calcium hydroxide powder in the groove through the silk-screen printing plate by using a dust blowing gun to compact the calcium hydroxide powder.

8. The method for producing a multi-tone transfer concrete carbonized article according to claim 1, characterized in that: and d, standing for 15-30 minutes after the calcium hydroxide is printed.

9. The method for producing a multi-tone transfer concrete carbonized article according to claim 1, characterized in that: in the step e, the concentration of carbon dioxide for normal-pressure carbonization maintenance is more than or equal to 20 percent; the time of carbonization and maintenance under normal pressure is 2-10 hours.

10. A multi-tone transfer printing concrete carbonized product is characterized in that: obtained by the production method according to any one of claims 1 to 9.

Technical Field

The invention relates to the field of multi-tone transfer printing concrete carbonization, in particular to a preparation method of a multi-layer screen printing multi-tone transfer printing concrete carbonized product.

Background

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 a part of aggregates on the surface of the concrete through a retarding technology. The transfer printing concrete has the advantages that the patterns are fine and complex, can be changed at will, can greatly create space for architectural designers compared with common decorative materials, and can achieve excellent artistic effect. In recent years, the development of transfer concrete is more and more rapid, and the application range is wider and wider.

However, the problems of monotonous patterns, insufficient decorative effect and the like caused by monotonous color of the transferred concrete are prominent. This severely limits the range of artistic expression applications for the transfer concrete.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a preparation method of a multi-layer silk-screen printing multi-tone transfer printing concrete carbonized product, which has simple process, low cost and rich colors.

In view of the problems in the prior art, the inventors have found through extensive studies that calcium hydroxide bodies expand by 11.8% in solid volume after carbonization and are firmly bonded to rough surfaces of concrete during carbonization. If the pattern part of the transfer-printed concrete forms a rough groove, if calcium hydroxide is printed on the wet transfer-printed pattern groove and filled, and a dust blowing gun is used for blowing calcium hydroxide powder in the groove through a screen printing plate so as to enable the groove to be compact, the compact calcium hydroxide powder can absorb moisture in the wet concrete groove. The use of the dust blowing gun across the screen printing plate allows the air flow of the dust blowing gun to be concentrated on the calcium hydroxide in a specific recess without interfering with the calcium hydroxide in the other recesses. At this time, the sample is carbonized, and calcium hydroxide is subjected to volume expansion during the carbonization process and is firmly combined with concrete, so that a multi-tone transfer-printed concrete carbonized product can be obtained. The method comprises printing calcium hydroxide powder of different colors on the grooves of the wet transfer printing pattern by screen printing according to the design pattern, filling the grooves, blowing the calcium hydroxide powder in the grooves by a dust blowing gun through a screen printing plate to compact the grooves, and standing for a period of time. And then carrying out normal pressure carbonization curing on the rotary printed product. During curing, the calcium hydroxide expands in volume and is firmly combined with the concrete, so that the transfer-printed concrete carbonized product has a multi-tone pattern.

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

a preparation method of a multi-layer silk-screen printing multi-tone transfer concrete carbonized product comprises the following steps:

a. the calcium hydroxide powder is dyed into different colors according to the requirement of design patterns.

b. And (5) manufacturing transfer concrete, wherein the depth of the groove of the transfer pattern is more than or equal to 0.5 mm.

c. And manufacturing different silk-screen printing plates according to the designed patterns, wherein one silk-screen printing plate corresponds to one pattern color.

d. Calcium hydroxide powder with different colors is printed on transfer printing pattern grooves containing 1/4-1/3 water through different screen printing plates, the grooves are filled, the calcium hydroxide powder is compacted, and the calcium hydroxide powder is placed for a period of time. In this step, the calcium hydroxide powder in the groove is blown by a dust blowing gun through the screen printing plate to compact it.

e. And carrying out normal-pressure carbonization curing on the rotary printed product to obtain the multicolor transfer-printed concrete carbonized product.

In the step a, the particle size of the calcium hydroxide powder is preferably less than 75 μm, and an excessively large particle size will cause the calcium hydroxide powder to hardly penetrate through the screen printing plate, and finally cause insufficient color of the transferred concrete pattern.

In the step a, calcium hydroxide powder is dyed into different colors by using pigments; the pigment is preferably one or more of iron oxide, lead chromate, chromium oxide and the like. The dyeing method comprises immersing calcium hydroxide powder in pigment such as ferric oxide, lead chromate, chromic oxide, etc., stirring, coloring completely, and oven drying for use. Calcium hydroxide powder should be colored with pigments such as iron oxide, lead chromate, chromium oxide, etc., and other pigments such as azo red are liable to be discolored under outdoor ultraviolet irradiation because of insufficient durability of the pigment.

In the step b, the manufacturing process of the transfer concrete is as follows: printing the retarder on a PVC film according to a design pattern, pouring concrete on the PVC film, tearing the PVC film after curing until the strength is greater than 5MPa, and flushing the surface of the concrete by using a high-pressure water gun to obtain the transfer concrete. Insufficient concrete strength will result in spreading of the transferred concrete pattern.

In the step b, the depth of the groove of the transfer printing pattern is more than or equal to 0.5mm, and the too shallow depth of the groove of the transfer printing pattern can cause that the calcium hydroxide is not tightly combined with the transfer printing concrete, and the calcium hydroxide is not thick enough and the color is not bright enough.

In the step c, different silk-screen printing plates are manufactured through silk-screen printing according to different colors contained in the design pattern, and one silk-screen printing plate corresponds to one pattern color. If a screen printing plate corresponds to a plurality of colors, the colors of the patterns are disordered, and the required patterns cannot be presented.

In the step c, the aperture of the silk-screen printing plate is preferably larger than 100 μm, and if the aperture is too small, the calcium hydroxide powder is difficult to penetrate through the silk-screen printing plate, and finally the color of the transferred concrete pattern is insufficient.

In the step d, the calcium hydroxide powder is required to be printed on the transfer pattern groove containing 1/4-1/3 water of the groove volume, and excessive water content can cause excessive water content of the calcium hydroxide powder, so that the calcium hydroxide powder is difficult to carbonize, and finally the pattern is easy to fall off. Too little water content will result in calcium hydroxide with too little water content, carbonization is difficult to proceed, and finally the pattern is easy to fall off.

In the step d, the groove of the transfer pattern needs to be filled and leveled by calcium hydroxide powder, and if the amount of the calcium hydroxide is too small, the color of the transfer concrete cannot be covered; excessive calcium hydroxide causes difficulty in uniform diffusion of water into the calcium hydroxide powder and failure in carbonization reaction.

In the step d, the calcium hydroxide powder in the groove is blown by a dust blowing gun through the screen printing plate to be compact, if the dust blowing gun is not used, the calcium hydroxide powder is not compact enough and cannot reach the required strength after carbonization, and finally the pattern is easy to fall off. If the dust blowing gun is not used through the screen printing plate, calcium hydroxide in other grooves is blown away, and the fineness of the patterns is finally influenced.

In the step d, the time for standing after the calcium hydroxide is printed is preferably 15-30 minutes. Standing for 15-30 minutes after the calcium hydroxide is printed to ensure that water is uniformly diffused, wherein if the standing time is too short, the water is not uniformly diffused, part of the calcium hydroxide cannot be carbonized, and the phenomena of powder falling and color fading occur in the later period; the excessive standing time can cause water evaporation loss, influence carbonization, and also cause powder falling and fading phenomena.

In the step e, the concentration of carbon dioxide for normal pressure carbonization and maintenance is preferably more than 20%. Too low carbon dioxide concentration will result in insufficient calcium hydroxide carbonization and easy falling of color patterns.

In the step e, the time for carbonization and maintenance under normal pressure is preferably 2-10 hours, and the calcium hydroxide is not reacted completely due to too short carbonization time, is not tightly bonded with concrete and is easy to fall off; too long carbonization time will prolong the construction period and increase the cost.

A multi-tone transfer concrete carbonized product is obtained by the preparation method.

The invention has the advantages and beneficial effects that: the method is simple and low in cost, and the prepared multicolor transfer printing concrete carbonized product has fine and firm 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 preparation method of a transfer-printed concrete carbonized product comprises the following steps:

a. calcium hydroxide powder is immersed into the pigment to be dyed into different colors according to the requirement, and the calcium hydroxide powder is dried for standby after being completely dyed. The pigment is composed of one or more of iron oxide, lead chromate, chromium oxide and the like.

b. Printing the retarder on a PVC film according to a design pattern, pouring concrete on the PVC film, tearing the PVC film after curing until the strength is greater than 5MPa, scouring the surface of the concrete by using a high-pressure water gun to obtain transfer concrete, wherein the depth of a groove of the transfer pattern is greater than or equal to 0.5 mm.

c. And manufacturing different silk-screen printing plates by silk-screen printing according to the design patterns, wherein one silk-screen printing plate corresponds to one pattern color.

d. Calcium hydroxide powder with different colors is printed on the wet transfer printing pattern groove through different silk-screen printing plates, the groove is filled, the calcium hydroxide powder in the groove is blown by a dust blowing gun through the silk-screen printing plates to be compact, and the silk-screen printing plates are kept stand for a period of time.

e. And carrying out normal-temperature normal-pressure carbonization curing on the rotary printed product.

The parameters and effects of examples 1 to 4 and comparative examples 5 to 19 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.