CN113462260A

CN113462260A - Method for demoulding large hollow gypsum board core tube

Info

Publication number: CN113462260A
Application number: CN202110634482.6A
Authority: CN
Inventors: 潘平; 徐晓东; 杨平; 黄彬; 程浩; 杨俊恺; 程力; 张赫; 陈宏宇; 徐威
Original assignee: Chengdu Shangzhu Building Materials Co ltd
Current assignee: Chengdu Shangzhu Building Materials Co ltd
Priority date: 2021-06-08
Filing date: 2021-06-08
Publication date: 2021-10-01

Abstract

The invention discloses a method for demoulding a hollow gypsum large-plate core tube, which belongs to the technical field of building materials and comprises the following steps: before the core pipe is used, a layer of hard crystal glue drops is coated on the surface of the core pipe, and the hard crystal glue drops consist of a component A and a component B, wherein the component A is epoxy resin, and the component B is a curing agent; the invention adopts the method of coating a layer of hard crystal glue drops on the surface of the core pipe to solve the problem of difficult demoulding of the core pipe, compared with the traditional method of plating chromium on the surface of the core pipe, the direct cost of the invention can be reduced by more than 90 percent, and after the hard crystal glue drops are coated, if the glue layer is locally dropped off due to scraping in the using process, the invention can carry out instant repair on the dropped part, thereby solving the problem that the whole body needs to be plated with chromium again after the surface layer of the chromium-plated core pipe is dropped off, the normal using frequency of the core pipe can be improved to about 5000 times, and the production efficiency and the comprehensive production cost of the hollow gypsum large board are further reduced.

Description

Method for demoulding large hollow gypsum board core tube

Technical Field

The invention relates to the technical field of building materials, in particular to a method for demoulding a hollow gypsum large-plate core tube.

Background

With the increasing requirements on energy conservation and environmental protection, large hollow gypsum boards made of building gypsum as a raw material and doped with inorganic light aggregates are widely used in buildings, especially fabricated buildings.

In the production and manufacturing process of the hollow gypsum large board, slurry is easy to adhere to the surface of the core pipe, so that the demoulding is difficult, and in order to solve the problem, the common solution at present is to electroplate a layer of metal such as chromium on the surface of the core pipe, so as to improve the smoothness of the surface of the core pipe and reduce the friction force between the core pipe and the slurry; although the hardness of the metal chromium is high, after the metal chromium is used for a long time, the metal chromium is generally used for about 3000 times, the abrasion still occurs, the core pipe is difficult to demold, and then the core pipe needs to be sent to a professional electroplating factory for chromium plating repair.

Disclosure of Invention

The invention aims to provide a method for demoulding a hollow gypsum large board core tube, which solves the problems.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a method for demoulding the core tube of hollow gypsum board features that before it is used, a layer of epoxy resin is coated on its surface.

The problem of core tube demoulding is solved, the surface of a core tube is generally required to have higher hardness, but the wear resistance of different materials is different even if the hardness is the same, so that a material which not only has higher hardness, but also has good wear resistance to gypsum large plate material slurry is required to be found by the technical personnel in the field; in addition, the core tube has a good finish and is helpful for core tube demoulding, so that the surface of the core tube is required to have high hardness, resist the friction of gypsum slurry and have good finish.

In order to meet the above requirements, the inventors have made a number of experiments and have made attempts to use a large number of materials.

The epoxy resin is a high molecular polymer with a molecular formula of (C)₁₁H₁₂O₃) n is a generic name of a polymer containing more than two epoxy groups in a molecule; it is a polycondensation product of epichlorohydrin and bisphenol A or a polyol. The epoxy resin has excellent physical mechanical and electrical insulating properties and bonding properties with various materials, so that the epoxy resin can be prepared into coatings, composite materials, casting materials, adhesives, mould pressing materials, injection molding materials and the like, and the epoxy resin is widely applied to the fields of bonding, corrosion prevention, sealing and the like;

the hard crystal glue drops are bi-component products which take epoxy resin as a component A and take a curing agent as a component B, and are generally used for manufacturing badges, nameplates and artworks at present;

the inventor of the application proves through a large number of tests that before the core pipe is used, a layer of hard crystal glue drops is coated on the surface of the core pipe, the surface smoothness of the core pipe made of metal materials can be obviously improved, the friction force between the core pipe and gypsum large-board slurry is obviously reduced, the effect of the core pipe can be equivalent to that of chromium plating, even the wear resistance of the core pipe is better than that of the core pipe chromium plating, and more importantly, after the core pipe is worn for a long time, the core pipe can be automatically coated with glue for repairing without depending on a professional electroplating factory, so that the problem of difficult core pipe demoulding is well solved.

As a preferred technical scheme: the epoxy value of the epoxy resin is 0.5-0.6, and the curing agent is an amine curing agent. The amine curing agent may be T31, T33, ZY2061, etc.; the using mass ratio of the epoxy resin to the curing agent is 2.5-3.5: 1.

as a preferred technical scheme: the thickness of the coated epoxy resin is 1-1.5 mm. The thickness can provide longer core tube finish retention time without affecting the normal mould and process of the gypsum large board.

Compared with the prior art, the invention has the advantages that: compared with the traditional method of plating chromium on the surface of the core pipe, the method has the advantages that the direct cost (the material cost and the process cost of plating chromium and coating hard crystal glue drops) can be reduced by more than 90 percent, the normal use frequency of the core pipe can be increased to about 5000 times after the hard crystal glue drops are coated, and the production efficiency and the comprehensive production cost are further reduced.

Detailed Description

The present invention will be further described with reference to the following examples.

Example 1:

before the core pipe is used, a layer of hard crystal glue drops are coated on the surface of the core pipe, wherein the hard crystal glue drops consist of a component A and a component B, the component A is epoxy resin and is E-51 (Phoenix brand WSR 618), the component B is a curing agent and is T31 (Hui jin), the mass ratio of the component A to the component B is 3:1, and the coating thickness is 1.5 mm;

tests prove that the normal smoothness of the core pipe can be maintained even if the core pipe is used for 4930 times.

Example 2

Before the core pipe is used, a layer of hard crystal glue drops are coated on the surface of the core pipe, wherein the hard crystal glue drops consist of a component A and a component B, the component A is epoxy resin and is E-51 (Phoenix brand WSR 618), the component B is a curing agent and is T31 (Hui jin), the mass ratio of the component A to the component B is 2.5:1, and the coated thickness is 1.5 mm;

tests prove that the core tube can keep normal finish when the use frequency of the core tube is about 4900 times by adopting the method.

Example 3

Before the core pipe is used, a layer of hard crystal glue drops are coated on the surface of the core pipe, wherein the hard crystal glue drops consist of a component A and a component B, the component A is epoxy resin and is E-51 (Phoenix brand WSR 618), the component B is a curing agent and is T31 (Hui jin), the mass ratio of the component A to the component B is 3.5:1, and the coated thickness is 1.5 mm;

tests prove that the normal smoothness of the core pipe can be maintained even if the use frequency of the core pipe is about 4910 times by adopting the method.

Example 4

Before the core pipe is used, a layer of hard crystal glue drops are coated on the surface of the core pipe, wherein the hard crystal glue drops consist of a component A and a component B, the component A is epoxy resin and is E-51 (Phoenix brand WSR 618), the component B is a curing agent and is T31 (Hui jin), the mass ratio of the component A to the component B is 3:1, and the coating thickness is 1.0 mm;

Example 5

Example 6

Before the core pipe is used, a layer of hard crystal glue drops are coated on the surface of the core pipe, wherein the hard crystal glue drops consist of a component A and a component B, the component A is epoxy resin and is E-51 (Phoenix brand WSR 618), the component B is a curing agent and is ZY2061 (Xuzhou Zhongji science), the mass ratio of the component A to the component B is 3.5:1, and the coated thickness is 1.0 mm;

tests prove that the core tube can maintain normal smoothness even if the use times of the core tube are about 5300 times by adopting the method.

Comparative example 1

Based on example 6, the mass ratio of the component A to the component B was 2:1, and the number of times of core tube use was 3100 without changing the rest.

Comparative example 2

Based on example 6, the component A was E-44 (Phoenix brand), the rest was unchanged, and the number of uses of the core tube was about 2630.

Comparative example 3

Based on example 6, the component B was polyetheramine D230, the remainder was unchanged, and the number of uses of the core tube was 2510 times or so.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A method for demoulding a hollow gypsum large-board core tube is characterized by comprising the following steps: before the core pipe is used, a layer of hard crystal glue drops is coated on the surface of the core pipe, and the hard crystal glue drops are composed of a component A and a component B, wherein the component A is epoxy resin, and the component B is a curing agent.

2. The method of demolding a hollow gypsum board core tube of claim 1, wherein: the epoxy value of the epoxy resin is 0.5-0.6, and the curing agent is an amine curing agent.

3. The method of demolding a hollow gypsum board core tube of claim 1, wherein: the thickness of the coated epoxy resin is 1-1.5 mm.