CN202596508U - Light-weight gypsum fireproof door core plate - Google Patents

Abstract

The utility model belongs to the field of building materials and relates to a light-weight gypsum fireproof door core plate. The light-weight gypsum fireproof door core plate comprises a door core plate which is formed by adhering high-strength gypsum to chopped fibers, wherein the thickness of the door core plate is between 3 cm and 7 cm; and grid cloth is arranged on the upper and lower surfaces of the door core plate or in the middle of the door core plate. The utility model has the advantages that the pH value of the light-weight gypsum fireproof door core plate is neutral, so a door frame cannot be corroded, and the door core plate has the characteristics of high strength, low combined cost, simple and reasonable production process, good moisture-absorption and moisture-proof effects and long fireproof limit time, and is environment-friendly and pollution-free.

Description

A lightweight gypsum fire door core board

technical field

The utility model belongs to the field of building materials, and relates to a door core board, in particular to a lightweight gypsum fireproof door core board. There is a mesh cloth in the middle, and the door core board has high strength, good moisture absorption and moisture resistance.

Background technique

The fire door core panels currently on the market are mainly made of four types of materials. The first type is aluminum silicate wool board, rock wool, slag wool or glass wool. High energy consumption, organic adhesives are used to form, pollution occurs during production and use, and it is difficult to meet environmental protection requirements. At the same time, there are poor integrity of fire door core panels, short fire resistance limit time, poor mechanical properties, easy deformation, and inconvenient use. Problem; the second type is the perlite fire door core board, although the fire resistance is better, but the board is formed by strong alkaline adhesives such as water glass, which is corrosive and has poor strength and toughness. It is easy to be damaged; the third category is the vermiculite fire door core board, which is formed by organic or inorganic adhesives, which has the problems of complex production process, limited source of raw materials, high dry density and high comprehensive cost; the fourth category is chlorine Although the magnesium oxide cement fire door core board has the characteristics of light weight, high strength and low cost, its key technical problems such as unstable volume, moisture absorption, halogen and frost return, warping and deformation, and short fire resistance limit time have not been solved. Effective solution.

Contents of the invention

The purpose of the utility model is to propose a technical scheme of a lightweight gypsum fireproof door core board. The door core board adopts the structural form of high-strength gypsum bonded with chopped fibers. Mesh cloth is arranged on the upper and lower surfaces or in the middle of the door core board. The door core board has high strength and good moisture absorption and moisture resistance.

In order to achieve the above object, the technical solution of this utility model is: a lightweight gypsum fireproof door core board, including a door core board with a thickness of 3cm to 7cm formed by high-strength gypsum bonded with chopped fibers, and the upper and lower sides of the door core board Mesh cloth is arranged on the surface or in the middle.

The chopped fibers are chopped glass fibers or chopped polyester fibers or chopped polypropylene fibers or wood fibers with a diameter not greater than 40um and a length of 6mm to 12mm.

The high-strength gypsum is chemical gypsum or natural anhydrite or α-hemihydrate gypsum prepared from natural dihydrate gypsum, and the mesh cloth is a glass fiber mesh cloth with a mesh size of 4mm×4mm or 6mm×6mm. the

The beneficial effects of the utility model are: the pH value of the gypsum door core board is neutral, does not corrode the door frame, the door core board has high strength, low comprehensive cost, simple and reasonable production process, environmental protection and no pollution, good moisture absorption and moisture resistance, and fire resistance The characteristic of long limit time. the

Below in conjunction with accompanying drawing and embodiment the utility model is described in detail.

Description of drawings

Fig. 1 is the structural representation of grid cloth in the middle of the door core board of the utility model;

Fig. 2 is a structural schematic diagram of the grid cloth on the upper and lower surfaces of the door core plate of the utility model.

Detailed ways

A lightweight gypsum fireproof door core board, see Figure 1 and Figure 2, said door core board includes a door core board 2 with a thickness of 3cm to 7cm formed by high-strength gypsum bonding chopped fibers 1, in order to strengthen the door core board The strength of the door core board is provided with mesh cloth 3 on the upper and lower surfaces or in the middle of the door core board, that is, when the door core board is thin, only a layer of mesh cloth is added in the middle of the door core board; At the same time, grid cloth is respectively arranged on the upper and lower surfaces of the door core board. The production process is to pour gypsum slurry mixed with chopped fibers into a mold and then form it. If it is two layers of mesh cloth, spread a layer of mesh cloth on the bottom of the mold before pouring the gypsum slurry. Then spread another layer of grid cloth on the upper surface; if only one layer of grid cloth is added, lay the grid cloth after pouring half of the gypsum slurry, and then pour the other half of the gypsum slurry. A foaming agent is mixed into the high-strength gypsum.

The high-strength gypsum described in the examples is one of chemical gypsum, natural anhydrite or α-hemihydrate gypsum prepared from natural dihydrate gypsum, with a flexural strength of 6.0 MPa and a compressive strength of 50.0 MPa.

In an embodiment, the chopped fibers are chopped glass fibers or chopped polyester fibers or chopped polypropylene fibers or wood fibers with a diameter not greater than 40 um and a length of 6 mm to 12 mm.

In an embodiment, the mesh cloth is a glass fiber mesh cloth with a mesh size of 4mm×4mm or 6mm×6mm.

The pH value of the fire door core board in the above embodiment is 7, which is neutral, and does not corrode the door frame. Long, the dry density of the fire door core board is 300~450kg/m ³ , the absolute dry compressive strength is not less than 1.0MPa, and the absolute dry flexural strength is not less than 0.5MPa, which meets the requirements of GB8624-2006 "Classification of Combustion Behavior of Building Materials and Products" Class A1 fire rating.

Claims (4)

1. a light gypsum anti-fire door core board is characterized in that, said door panel comprises that the thickness that is formed by the bonding chopped strand of high strength gypsum is the door panel of 3cm to 7cm, is provided with grid cloth in the upper and lower surfaces or the centre of door panel.

2. a kind of light gypsum anti-fire door core board according to claim 1 is characterized in that, said chopped strand is that diameter is not more than 40um, length is cut polyester fiber or short polypropylene fibre or the wood fibre cut at short glass fiber or the weak point of 6mm to 12mm.

3. a kind of light gypsum anti-fire door core board according to claim 1 is characterized in that, said high strength gypsum is chemical gypsum or natural anhydrite or by the α-semi-hydrated gypsum of natural dihydrate gypsum preparation.

4. a kind of light gypsum anti-fire door core board according to claim 1 is characterized in that, said grid cloth is that mesh size is the fiberglass gridding cloth of 4mm * 4mm or 6mm * 6mm.

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