CN109279910B

CN109279910B - Method for preparing gypsum board

Info

Publication number: CN109279910B
Application number: CN201710589273.8A
Authority: CN
Inventors: 朱清玮; 滕伟广; 王永生; 王鹏起
Original assignee: Beijing New Building Material Group Co Ltd
Current assignee: Beijing New Building Material Group Co Ltd
Priority date: 2017-07-19
Filing date: 2017-07-19
Publication date: 2021-10-08
Anticipated expiration: 2037-07-19
Also published as: CN109279910A

Abstract

A method of making gypsum board, the method comprising the steps of: dispersing glass fibers in water to obtain an aqueous dispersion system containing the glass fibers; at the outlet of the gypsum slurry, spraying the aqueous dispersion comprising glass fibers into the gypsum slurry through a flow meter connected to a pump; and attaching protective paper on the upper surface and the lower surface, forming and drying to obtain the gypsum board. The preparation method of the application can enable the glass fibers to be uniformly distributed in the paper-surface gypsum board, improves the fire stability of the paper-surface gypsum board, avoids equipment faults caused by the fact that the glass fibers wind the stirring rod in the mixing machine, and improves the production efficiency.

Description

Method for preparing gypsum board

Technical Field

The application relates to but is not limited to the field of inorganic building material preparation, in particular to but not limited to a preparation method of a fireproof gypsum board containing glass fiber.

Background

The paper-surface gypsum board is a light board formed by taking gypsum slurry as a sandwich and taking paper as protective surfaces on two sides. The paper-surface gypsum board has light weight, high strength, fire resistance, moth resistance and easy processing. Ordinary paper-faced gypsum board is used for interior walls, partition walls and suspended ceilings. The water-resistant paper-surface gypsum board subjected to fire-proof treatment can be used for room walls with higher humidity, such as lining boards for sticking ceramic tiles, metal plates and plastic surface brick walls in toilets, kitchens, bathrooms and the like.

The addition of reinforcing and fire-resistant materials to gypsum plasterboards has been widely studied and used to improve the strength and fire stability of gypsum plasterboards. The glass fiber is used as a fire-resistant reinforcing material, is applied to the thistle board, improves the strength and the fire stability of the thistle board to a certain extent, and is low in price. But the adding mode of the glass fiber influences the distribution of the glass fiber in the gypsum board, thereby greatly influencing various performance indexes of the gypsum board. Currently, there are two main ways of adding glass fibers to gypsum boards: firstly, mixing glass fiber with other raw materials for preparing gypsum board; secondly, before the protective paper is attached, the glass fiber is sprayed on the surface of the slurry of other raw materials. However, the first method has the defects that the glass fiber is easy to wind the stirring rod when being mixed with other raw materials in the mixer, thereby causing frequent equipment failure and low production efficiency; the second mode has the disadvantage that only one layer of glass fibers is formed on the surface of the gypsum board and the glass fibers are not uniformly distributed throughout the gypsum board.

Disclosure of Invention

The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

The application provides a preparation method of a fireproof gypsum board capable of uniformly distributing glass fibers in the whole gypsum board, and solves the problems of difficulty in adding and uneven distribution of the glass fibers in the existing gypsum board preparation process by utilizing the glass fibers.

In particular, the present application provides a method of making gypsum board.

The method for preparing the gypsum board provided by the application comprises the following steps:

dispersing glass fibers in water to obtain an aqueous dispersion system containing the glass fibers;

spraying the aqueous dispersion comprising glass fibers into a gypsum slurry at an outlet of the gypsum slurry;

and attaching protective paper on the upper surface and the lower surface, forming and drying to obtain the gypsum board.

In embodiments of the present application, the aqueous dispersion comprising glass fibers may be sprayed into the gypsum slurry using power provided by a pump.

Optionally, the pump is a pressure pump, a vortex pump, a progressive cavity pump, as is common in the art.

In embodiments of the present application, the aqueous dispersion comprising glass fibers may be sprayed into the gypsum slurry by a flow meter connected to a pump, which flow meter controls the amount of addition of the glass fibers.

In the application, because the adding amount of the glass fiber is controlled by the flowmeter, and the power provided by the pump is determined by the flow rate of the flowmeter, under the condition that the adding amount of the glass fiber is determined, the flow rate of the flowmeter and the power provided by the pump do not need to be limited, and the beneficial effects can be obtained only by controlling the adding amount of the glass fiber by the flowmeter.

In an embodiment of the present application, the glass fiber may be added in an amount of 0.25 to 0.3% by weight of the gypsum board.

In an embodiment of the present application, the content of the glass fiber in the aqueous dispersion system including the glass fiber may be 0.2 to 0.5% by weight.

In embodiments of the present application, the glass fibers may be selected from the group consisting of ordinary glass fibers, starch-type glass fibers, 546-type glass fibers.

In the present application, the term "ordinary glass fiber" refers to a glass fiber that has not been subjected to any treatment and reinforcement.

In embodiments of the present application, the gypsum slurry may include desulfurized gypsum, a binder, a foaming agent.

Alternatively, the binder is a binder commonly used in the art and the foaming agent is a foaming agent commonly used in the art.

The method of this application is through with glass fiber dispersion in aqueous, adopt the mode of spraying, add glass fiber in the gypsum slurry in the exit of gypsum slurry, especially when spraying glass fiber under the power effect of pump, glass fiber is given great initial velocity, can go deep into in the whole gypsum slurry, the intensive mixing of glass fiber and gypsum slurry has been guaranteed, the evenly distributed of glass fiber in the thistle board has been realized, thereby the stability of meeting fire of thistle board has been improved, the equipment trouble that glass fiber twines the puddler and cause in the mixer has been avoided simultaneously, and the production efficiency is improved.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof.

Detailed Description

Hereinafter, embodiments of the present application will be described in detail to make objects, technical solutions and advantages of the present application more apparent. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The raw materials used in the following examples are all common commercial products.

Example 1

Adding water into common glass fiber to prepare a water dispersion system with the glass fiber content of 0.5 weight percent; weighing 100 parts by weight of desulfurized gypsum, 0.2 part by weight of binder and 0.03 part by weight of foaming agent, and adding the materials into a mixer to mix into gypsum slurry; 60 parts by weight of an aqueous dispersion containing glass fibers (i.e., 0.3 parts by weight of glass fibers) was sprayed into the gypsum slurry at the outlet of the gypsum slurry by means of a flow meter connected to a pressure pump; and attaching protective paper on the upper and lower surfaces, forming and drying to obtain the gypsum plaster board.

Example 2

Adding water into starch type glass fiber to prepare a water dispersion system with the content of the glass fiber of 0.5 weight percent; weighing 100 parts by weight of desulfurized gypsum, 0.2 part by weight of binder and 0.03 part by weight of foaming agent, and adding the materials into a mixer to mix into gypsum slurry; 60 parts by weight of an aqueous dispersion containing glass fibers (i.e., 0.3 parts by weight of glass fibers) was sprayed into the gypsum slurry at the outlet of the gypsum slurry by means of a flow meter connected to a pressure pump; and attaching protective paper on the upper and lower surfaces, forming and drying to obtain the gypsum plaster board.

Example 3

Adding water into 546 type glass fiber to prepare a water dispersion system with the content of the glass fiber of 0.5 weight percent; weighing 100 parts by weight of desulfurized gypsum, 0.2 part by weight of binder and 0.03 part by weight of foaming agent, and adding the materials into a mixer to mix into gypsum slurry; spraying 60 parts by weight of a water dispersion system containing glass fibers (i.e., 0.3 part by weight of glass fibers) into the gypsum slurry at an outlet of the gypsum slurry through a flow meter connected to a screw pump; and attaching protective paper on the upper and lower surfaces, forming and drying to obtain the gypsum plaster board.

Example 4

Adding water into starch type glass fiber to prepare a water dispersion system with the content of the glass fiber of 0.5 weight percent; weighing 100 parts by weight of desulfurized gypsum, 0.2 part by weight of binder and 0.03 part by weight of foaming agent, and adding the materials into a mixer to mix into gypsum slurry; 50 parts by weight of an aqueous dispersion containing glass fibers (i.e., 0.25 parts by weight of glass fibers) was sprayed into the gypsum slurry at the outlet of the gypsum slurry by means of a flow meter connected to a pressure pump; and attaching protective paper on the upper and lower surfaces, forming and drying to obtain the gypsum plaster board.

Comparative example 1

Weighing 100 parts by weight of desulfurized gypsum, 0.2 part by weight of binder, 0.03 part by weight of foaming agent and 0.25 part by weight of starch type glass fiber, adding into a mixer, and mixing to obtain gypsum slurry; and attaching protective paper on the upper and lower surfaces, forming and drying to obtain the gypsum plaster board.

Comparative example 2

Adding water into starch type glass fiber to prepare a water dispersion system with the content of the glass fiber of 0.5 weight percent; weighing 100 parts by weight of desulfurized gypsum, 0.2 part by weight of binder and 0.03 part by weight of foaming agent, and adding the materials into a mixer to mix into gypsum slurry; spreading the slurry on a lower protective paper, spraying 50 parts by weight of a water dispersion system containing glass fibers (namely, 0.25 part by weight of the glass fibers) on the upper surface of the gypsum slurry through a spraying device without a pump before the gypsum slurry is compounded with the upper protective paper, attaching the protective paper on the upper surface and the lower surface, forming and drying to prepare the gypsum plaster board.

Test example

The gypsum boards produced in the above examples and comparative examples were tested for flexural strength, compressive strength and fire stability according to the national standard GB/T9775-2008 "gypsum plasterboard", and the results are shown in Table 1.

TABLE 1

As can be seen from Table 1, the preparation method of the embodiments 1-4 of the present application can uniformly disperse the glass fiber in the gypsum board, obviously improve the fire stability of the gypsum board, and the strength and paper-bonding performance of the gypsum board are also better.

The application solves the problems of difficult glass fiber addition and uneven distribution in the prior art. Meanwhile, the glass fiber does not need to enter a mixer to be mixed with other raw materials, so that the stirring rod cannot be wound naturally, and frequent equipment failure is avoided.

Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.

Claims

1. A method of making gypsum board, the method consisting of the steps of:

attaching protective paper on the upper surface and the lower surface, forming and drying to obtain the gypsum board; the aqueous dispersion comprising glass fibers is sprayed into the gypsum slurry using power provided by a pump.

2. The method of claim 1, wherein the aqueous dispersion comprising glass fibers is sprayed into the gypsum slurry by a flow meter connected to a pump, the flow meter controlling the amount of glass fibers added.

3. The method of any of claims 1-2, wherein the glass fibers are added in an amount of 0.25 to 0.3% by weight of the gypsum board.

4. The method according to any one of claims 1 to 2, wherein the content of glass fibers in the aqueous dispersion comprising glass fibers is 0.2 to 0.5% by weight.

5. The method of any of claims 1-2, wherein the glass fibers are selected from the group consisting of regular glass fibers, starch-type glass fibers, 546-type glass fibers.