JPS60372B2 - Method for manufacturing flame retardant foam - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a flame-retardant foam material incorporating non-flammable ribs.

Conventionally, in order to make flammable synthetic resins, especially cold-setting synthetic resins, flammable, non-combustible aggregates such as perlite grains, which are highly fire-resistant and heat-resistant, have often been mixed in.

However, the expansion ratio of foamed materials to which this type of aggregate is added is considerably reduced due to the following reasons, which is disadvantageous in terms of the amount of resin used and workability.

For example, when a two-component reaction type polyurethane resin was used as a foam material raw material and pearlite particles were added as a bone filler, the foaming ratio was about 20% of free foaming. This is because the polyurethane resin was absorbed by the pearlite particles, reducing the total amount. On the other hand,
The composition of the synthetic resin raw material is oil-based. Therefore, when pearlite particles are added to a polyurethane resin raw material, a large amount of the polyurethane resin before foaming is absorbed by the outer shell of the pearlite particles, which is porous and has a large surface area. This is the same as when the amount of the supplied polyurethane resin raw material changes, and the expansion ratio of the foam material becomes close to the expansion ratio of the decreased polyurethane resin raw material. Moreover, even though the supply amount of the polyurethane resin raw material has decreased, the amount of pearlite particles added remains constant, so the fluidity of the pearlite particles in the resin during foaming is extremely inhibited, resulting in non-uniform dispersion. This results in the formation of flame retardant defects. Furthermore, as the pearlite particles become larger than the size of the pearlite particles themselves that have adsorbed the polyurethane resin, the specific gravity of the pearlite particles, which is usually about 0.02, becomes heavier due to the adsorption of the polyurethane resin. As the height increases, the fluidity of pearlite grains can hardly be expected. In other words, in order to obtain a foam material with homogeneous flame retardancy, it is essential to uniformly disperse pearlite particles.
However, it has been difficult to uniformly disperse pearlite grains, etc., which have non-uniform particle sizes, low specific gravity, and are bulky. The present invention was made in order to solve the above-mentioned problems, and it has two properties: 1. Good wettability with the foaming material raw material; 2. No change in the foaming material raw material; 2. Impregnating or adhering to the surface of pearlite grains, etc. ■We propose a manufacturing method in which the outer shells of pearlite particles are moistened, wet, or moistened using a liquid that has characteristics such as smoothing the flow of aggregate, and then added to the foam material raw material. be.

Below, the method for producing a flame-retardant foam material according to the present invention will be explained. First, the method for producing a flame-retardant foam material according to the present invention will be briefly explained. , or near it, and then add aggregate with a wet surface layer (shell).

The room temperature curable synthetic resin used in the present invention includes:
Polyurethane resins, polyisocyanurate foam raw material resins include epoxy resins, phenol resins, acrylic resins, etc. In addition, the aggregates mixed into the above resins include inorganic powder particles and fibrous materials, and the powder particles include perlite. These are inorganic substances such as grains, shirasu balloons, silica gel, talc, bentonite, kaolin, and shelf sand, and the fibrous substances include asbestos fiber whiskers, glass fibers, etc. In addition, in the present invention, the aggregate is kept in a wet state, Adding the room temperature curable synthetic resin raw material and aggregate in the states of ■ to ■ above,
The wetting substances that can be mixed include a surfactant, a crosslinking agent, a catalyst, a blowing agent, and one of the substances that are a component of the above-mentioned raw materials before reaction. To explain in more detail, surfactants include silicone oil, diethylaminooliate, sodium dioctyl sulfosuccinate, sodium dodecane sulfonate, sorbitan monostearate, ethyl cellulose, and quaternary ammonium, and crosslinking agents include hydroxy compounds, amino Alcohol, diamine, unsaturated polyester, vinyl compound, allyl compound, etc. are used.Furthermore, the above-mentioned blowing agent is freon (liquid), water (a small amount), etc., and the catalyst is triethylphosphine, trialkylamine, amino alcohol, esteramine, etc.If a catalyst is used, it should be kept in a particularly small amount.Also, one of the components of the resin raw material is used as a wetting substance.Also, when the wetting substance is mixed with the aggregate, Although the ratio is arbitrary, for example, a ratio of approximately 5 to 100 ta per 100 ta of pearlite grains (average grain size on the 3rd side) is suitable.

In other words, it is ideal that the amount is smaller than the amount added for coating or impregnation, and just enough to wet only the surface of the aggregate. In addition, the method of making the aggregate into a wet state includes, for example, spraying a wetting substance onto the aggregate, immediately mixing it with the room temperature curable synthetic resin raw material, and discharging the mixture.
Alternatively, there is a method in which the aggregate and the raw material are dispersed, and the wetting substance is attached to the aggregate just before the aggregate comes into contact with the resin raw material.

Examples will be described below.

Example polyurethane resin (room temperature curing synthetic resin raw material),
100 pearlite grains (average grain size 2-4 feet ◇) (Honemura) 5
0 evening silicone oil (wetting substance) 20 evening first,
The polyol and polyisocyanate are mixed in a primary mixer (not shown), and then passed through a hose to a secondary mixer (not shown).
(rotating vane type (not shown)).

Above the tertiary mixer is a pearlite grain supply port, and a nozzle for spraying silicone oil is attached to the side wall of the port. Then, silicone oil is sprayed onto the surface of the pearlite grains, mixed with polyurethane resin at the same time, and discharged into, for example, a mold. This is heated and pressurized at about 50 oo for 3 minutes and taken out as a flame-retardant foam material. When a part of this foamed material was cut and observed, the foamed structure was found to be uniform. b
The aggregate, which tends to be unevenly distributed, did not interfere with the formation of the foamed structure, that is, it was mixed uniformly without disturbing the cells, and was mixed without disturbing the voids or the foamed structure. From this, it was found that it had a positive effect on the formation of the foamed structure. Furthermore, in terms of fire resistance, good results were naturally obtained because nonflammable substances could be uniformly dispersed. As described above, according to the method for producing a flame-retardant foam according to the present invention, the use of wetting materials minimizes the amount of aggregates that have differences in specific gravity, adsorption properties, and associated physical resistance, etc. By adding it to the synthetic resin raw material, the aggregate can be uniformly mixed and dispersed within the foamed structure, and has the great feature that it is possible to easily produce a foamed material with excellent fire resistance and mechanical strength.

Claims (1)

[Claims] 1. After mixing each component of the room temperature curable synthetic resin raw material, adding nonflammable aggregate and reacting and foaming the raw material to produce a foam material, the surface of the aggregate is treated with a surfactant, a crosslinking agent, 1. A method for producing a flame-retardant foam material, which comprises adding a wetting agent in a wet state consisting of a foaming agent and at least one of the above-mentioned resin raw materials.