JPS5818226B2 - Flame retardant synthetic resin insulation material - Google Patents

Description

Detailed Description of the Invention The present invention is a combustible synthetic resin foam layer that is flammable but has excellent heat insulation properties and workability, and is protected by a dense fireproof layer made of inorganic porous particles and a noncombustible board member. Concerning flammable synthetic resin insulation materials.

Recently, it has become lightweight, has excellent insulation properties, and is easy to construct.
Synthetic resin foams, which have excellent adhesive properties, are widely used as heat insulating materials.

However, the biggest drawback of this synthetic resin foam is that it is combustible, melts and thermally decomposes at 200 to 300°C, easily burns, and in some cases generates toxic gas.

As a result, while the demand for insulation materials continues to grow, there is a need for some kind of flame-retardant method.

Taking the case of polyurethane foam as an example, countermeasures include: ■Flame retardation by raw material components, ■Additive flame retardant, ■Low melting point method, ■Post-treatment method, ■Introduction of heat-resistant structure, and ■Specific treatment. Flame retardant methods have been proposed.

However, all of the above flame retardant methods not only have drawbacks such as a decline in insulation performance, roughness of the foam structure, and increased costs, but also have the fatal drawback that they do not create a structure that guarantees flame retardancy. was there.

In other words, in the case of uncertain factors such as (1) above, it was not possible to reliably guarantee uniform dispersion because the organic or inorganic flame retardant was dispersed within the synthetic resin foam by addition and mixing.

Of course, if a large amount is added, the flame retardant will be the main ingredient and the synthetic resin foam will simply act as a binder, and while the flame retardance will improve considerably, the insulation performance will drop significantly and the specific gravity will increase. The drawbacks of the synthetic resin foam became conspicuous, and the most important feature of the synthetic resin foam was obliterated, resulting in the inconvenience that it no longer functioned as a heat insulating material.

In addition, all of the other flame retardant methods only increase the heat resistance temperature of synthetic resin foams by about 100 to 200° C. compared to conventional methods, and their reliability is also questionable.

In order to eliminate these drawbacks and difficulties, the present invention has a structure in which the number of synthetic resin foam layers is small (on the one hand, inorganic porous particles are densely distributed between the noncombustible plate member and the net-like material to form an inorganic heat insulating layer and fireproof layer). 1. To provide a heat insulating material with outstanding heat insulation and flame retardancy by combining these constituent materials with a synthetic resin foam layer and integrally constructing a synthetic resin foam layer on a fireproof layer. It is something.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The flame-retardant synthetic wood insulation material (hereinafter simply referred to as insulation material) according to the present invention will be described in detail below with reference to the drawings.

Figure 1 shows a longitudinal section of the above-mentioned heat insulating material. 1 is a noncombustible plate member mainly used as a surface material, and its materials include metal plates, plaster plates, cement mortar plates, wood wool cement plates, etc. Consisting of

Reference numeral 2 denotes a backing material which may be added as necessary, and this material may be one or more of waterproof paper, synthetic resin film, asbestos paper, and metal foil.

Reference numeral 3 denotes a synthetic resin foam layer which mainly functions as a heat insulating layer, and a net-like material 4 and an inorganic porous particle layer 5 are sequentially laminated on one side of the foam layer, and these are bonded and integrated at a portion thereof.

Materials for this synthetic resin foam layer include polyurethane resin, epoxy resin, melamine resin, acrylic resin, and the like.

The net-like material 4 is useful for suppressing displacement and movement of the inorganic porous particles during foaming of the synthetic resin.

In other words, the net-like material 4 functions as a presser or a filter to securely form the gap between the noncombustible plate member 1 and the synthetic resin foam layer 30.

To explain further, as described above, when forming the synthetic resin foam layer 3, the inorganic porous particle layer 5 is prevented from being displaced or moved from its initial position due to the fluidity and foaming pressure during foaming. A dense refractory layer is formed between a noncombustible plate member and a net-like material, and a refractory layer without defects is obtained.

Of course, a reinforcing effect can also be expected as a secondary effect.

The net-like material 4 is made of one or more organic, aluminum or inorganic substances, and specific examples include synthetic resin,
They have various structures such as knitting cotton, hemp thread, wire mesh glass fiber, etc., forming them into nonwoven fabrics, pressing them into a net shape, and fusing them.

Further, the size of the mesh of the net-like material 4 varies depending on the size of the inorganic porous particles, but at least the size is such that the inorganic porous particles 5 do not pass through the mesh of the net-like material 4.

The inorganic porous particle layer 5 reliably forms a dense fireproof layer between the noncombustible plate member 1 and the net-like material 4, and the inorganic porous particles include pearlite particles, shirasu balloons, glass balloons, and firestone. , coke, artificial porous cloth, improved pearlite grains which are further subjected to fireproofing and heat-resistant treatment, or so-called granulated fireproof materials made by granulating one or more types of inorganic materials that foam when heated or inorganic materials that do not foam when heated.

That is, these substances include borates, silicates, phosphates, and mixtures of two or more of these.

Specifically, borax, sodium metaborate, sodium silicate,
Sodium metasilicate, dibasic sodium phosphate, boron, potassium silicate, and sodium metasilicate and borax, silicate,
such as a mixture of magnesium acetate.

Note that sodium silicate and sodium borate also include those with controlled crystallization water, or so-called silicate and sodium silicate that have been heated slowly at a temperature that does not destroy their molecular structure.

Examples of non-foaming inorganic substances include carbonates, calcium salts, sulfates, and clay minerals, including soda carbonate, calcium carbonate, calcium silicate, sodium sulfate, gypsum, slaked lime, and antimony trioxide (Mg1 water). These include aluminum oxide, talc, bentonite, kaolin, and silica sand.

FIG. 2 shows a longitudinal section of a heat insulating material according to another invention,
Its structure is almost the same as that shown in FIG. 1, but inorganic porous particles are more securely fixed via a nonflammable adhesive 6.

This adhesive is water glass.

Next, an example will be explained.

Example 1 Polyurethane resin 100 parts by weight Pearlite grains (average particle size 511L1!Lφ) 40 Net-like material (glass fiber non-woven fabric) Colored iron plate adhesive for non-combustible plate member 0.27 mm (water glass) 10 parts by weight This configuration A heat insulating material as shown in Fig. 1 was manufactured using the following steps.

When we look at the cross section of this heat insulating material, we find that the pearlite particles undergo rapid volumetric expansion and flow during the foaming of polyurethane resin.
Even with the foaming pressure, the inorganic porous particle layer 5 was reliably formed between the net-like material 4 and the noncombustible plate member 1.

Moreover, a polyurethane resin foam layer was filled between the pearlite particles, and a highly heat-insulating synthetic resin foam layer 3 was formed on the net-like material 4.

Furthermore, a noncombustible plate member 1, pearlite grains, a net-like material 4
, the synthetic resin foam layer 3 was fixed together by the self-adhesive properties of the polyurethane resin.

In addition, the flame retardancy of this insulation material is 900℃
When exposed to direct flame for 5 minutes, only some smoke was observed, and no dimensional deformation or ignition was observed.

Therefore, when the noncombustible plate member was peeled off from the heat insulating material and the inorganic porous particle layer 5 was observed, it was found that only the polyurethane resin adhered to the noncombustible plate member had been burned.

Example 2 With this configuration, a heat insulating material as shown in FIG. 2 was manufactured.

This heat insulating material was found to be superior to Example 1 in terms of flame retardancy, but almost everything else was the same as in Example 1.

In other words, the reason why the flame retardance was excellent was that a so-called inorganic foam layer was formed between the noncombustible board member and the pearlite particles by foaming the water glass of the adhesive, and the polyurethane resin was almost completely combustible. There wasn't.

As a result, no smoke or ignition of the polyurethane resin was observed.

What has been described above is only one embodiment of the present invention, and the back material may be formed of the same material as the surface material, or a fire-resistant layer may be provided on the back material side.
A net-like material 4 may also be provided.

Furthermore, the noncombustible plate member or backing material can be formed into a roughly gutter shape or other shape depending on the purpose.

As described above, according to the flame-retardant synthetic resin heat insulating material according to the present invention, at least one of the combustible, high-insulating-performance, lightweight synthetic resin foam layer is reliably protected by the non-flammable plate member and the inorganic fire-resistant layer. , which has the characteristic of considerably improved flame retardancy.

Further, there is an advantage that flame retardancy can be sufficiently achieved without reducing the heat insulation performance of the synthetic resin foam layer at all.

[Brief explanation of drawings]

FIGS. 1 and 2 are longitudinal sectional views showing a flame-retardant synthetic resin heat insulating material according to the present invention. 1... Noncombustible plate member, 2... Back material,
3...Synthetic resin foam layer, 4...Net-like material, 5...Inorganic porous particle layer.

Claims (1)

[Scope of Claims] 1. An inorganic porous particle layer in which inorganic porous particles are densely laid is provided on a noncombustible plate member, and the inorganic porous particles are formed on the particle layer by a mesh having a size that does not allow the inorganic porous particles to pass through. A net-like material is laid down to hold down the particles and serve as a filter, and a synthetic resin foam layer is formed on the net-like material, and when the synthetic resin is foamed, these constituent materials are bonded and integrated without any change. Flame-retardant synthetic resin insulation material. 2. The flame retardant according to claim 1, characterized in that the inorganic porous particle layer is formed by fixing a portion of the inorganic porous particles to a noncombustible plate member via a noncombustible adhesive. Synthetic resin insulation.