JPH03122068A - Heat insullating material with excellent inflammability, water resistance and sound absoebing qualities and preparation thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat insulating material with excellent nonflammability, water resistance, and sound absorption properties, and a method for producing the same.

The uses of the heat insulating material obtained by the present invention are as follows.

Cores for interior doors and fire-resistant doors Aircraft, ship parts Houses, commercial and industrial building partition walls, exterior walls, sound-absorbing floors, ceilings and roofs Fire-resistant coating for steel frames Refrigeration and freezer walls and ceilings Tanks, duct piping heights, heat insulation for cold and heat Automobile mufflers, catalytic converters, engine room partitions, bathrooms, kitchen ceilings and walls Noise-proofing walls for factories, airports, highways, railways Spacecraft, missile heat-insulating materials, etc. [Conventional technology] Insulation currently in use Materials are calcium silicate, glass fiber, rock wool, and polyurethane.

They are made of styrofoam and cellular glass, but most of them have defects and inconvenience in use.

For example, calcium silicate insulation typically contains calcium chloride, which becomes corrosive when exposed to moisture. Additionally, it retains moisture for a long period of time, making it unsuitable for use in low-temperature environments.

Glass fiber insulation absorbs moisture and is therefore unsuitable for use in low temperature environments, nor is it suitable for use at temperatures above 540°C.

Rock wool insulation is also water-absorbing, making it unsuitable for use in low-temperature environments and can only be used in high-temperature environments where moisture is not present.

Polyurethane and Styrofoam insulation are suitable for use at low temperatures, but are unsuitable for use at high temperatures.
It is flammable and has the negative effects of shrinkage and toxic gas formation.

Cellular glass insulation is sensitive to thermal shock, so
It is unsuitable for use when rapid temperature changes are expected.

Further, according to patent documents and the like, various types of heat-resistant materials and compositions have been proposed. However, the heat-resistant materials and compositions described in these patent documents have moisture resistance, ease of manufacture and molding, effectiveness within a wide range of temperatures (e.g., effective at both high and low temperatures), heat shock resistance, There are serious doubts about its corrosion resistance and shrinkage resistance.

[Problem to be solved by the invention]

To compensate for the shortcomings of existing insulation materials mentioned in the prior art section above, new non-combustible, water-resistant and It is an object of the present invention to provide an ultra-lightweight heat insulating material with excellent sound absorption properties.

[Means to solve the problem]

The gist of the present invention is as follows.

(1) Expanded siliceous inorganic aggregate 50-70% by weight, sodium silicate 25-35% by weight, kaolin 5-12% by weight, reinforcing fiber up to 3% by weight, up to 5% by weight An insulating material with excellent nonflammability, water resistance, and sound absorption properties, consisting of a filler.

(2) expanded siliceous inorganic aggregate with a weight ratio of 50 to 70%, and a weight ratio of 25 to 25% containing solids in a range of 36 to 44%;
A solution of sodium silicate in the range of 35%, weight ratio 5 to 1
Prepare a mixture consisting of kaolin in a range of 2%, reinforcing fibers in a range of up to 3% by weight, and filler in a range of up to 5% by weight, press-mold the mixture, and mold the resulting molding. A method for producing a heat insulating material with excellent nonflammability, water resistance, and sound absorption properties, which is characterized by curing the product at high temperatures.

(3) The method for producing a heat insulating material with excellent nonflammability, water resistance, and sound absorption properties according to item 2 above, wherein the curing at high temperature is performed in an oven at 60 to 120°C for 2 to 16 hours.

The present invention will be explained in detail below.

The insulation material obtained according to the invention has physical properties that are extremely useful. The heat insulating material according to the present invention can be produced by preparing a mixture of the individual components described above, molding this mixture into a molded product under pressure, and then drying and curing the molded product to obtain a molded product with desired heat insulation properties. can be formed into

Various types of expanded siliceous mineral aggregates may be used in the present invention, including expanded perlite, expanded clay, cellular glass, expanded slag, expanded vermiculite, and the like.

The expanded siliceous inorganic aggregate is used in a weight ratio of 50 to 70% based on the weight of the composition, and since the aggregate is used in an expanded state, it increases the thermal insulation properties of the composition. The preferred expanded siliceous mineral aggregate used in the present invention is expanded perlite.

To make expanded pearlite, you need 700 pearlite ores.
Heating to a temperature range of ~1000℃, 30~2℃ depending on the purpose of use.
Expand to a density of 40 kg/n.

Expanded pearlite particles passed through a No. 50 to No. 200 mesh are used as the aggregate.

In the composition of the present invention, kaolin is further used in a weight ratio of 5 to 12%, preferably 5 to 8%. This kaolin is used to increase resistance to humidity and shrinkage.

In addition, rice malt ash is sometimes added to create patterns and to reduce weight.

Furthermore, up to 3% by weight of fibers are used as reinforcing agents in the present invention. Examples of fibers include nylon,
Organic reinforcing fibers selected from the group consisting of polyester, rayon, fiberglass, rock wool, and mixtures thereof are suitable for use.

Preferably, the reinforcing fibers used are stable at temperatures of at least about 120°C. Also, these fibers are preferably used in lengths of about 6 to 13 mm.

Various types of fillers may also be added to the compositions of the invention. For example, metal oxides such as calcium carbonate or iron oxide may be used. These fillers are generally used in amounts up to about 5% by weight, and one of the key ingredients of the present invention, preferably present in an amount of about 2-3%, is sodium silicate. This sodium silicate is within the range of 25 to 35% by weight,
and is used in the form of an aqueous solution containing about 36-44% solids.

The sodium silicate acts as an adhesive to bind the components of the composition of the invention and also imparts water resistance to the product upon curing.

Silicone oil may be added to the composition of the invention to increase its moisture resistance. Silicone oil is used in the form of a solution within a range of 0.8 to 1.2% by weight.

Based on the above weight ratios, each component of the composition of the present invention is mixed and stirred, and the resulting mixture is placed in a mold to make a molded product with a desired size, with a weight of 4.0 to 20 kg/cTIT.
Molded under pressure within the range of . The molded product obtained was 60
After dry curing in an oven for 2 to 16 hours at a temperature in the range ˜120° C., it is removed from the mold and refinished if necessary.

〔Example〕

72% by weight sodium silicate (solid content 38.3%) and 28% water were stirred for about 2 hours, resulting in a mixed solution 2.
7. Add 1648 liters (34,088 kg) to another mixing tank and stir thoroughly. Then 0.7
Gradually processing 711 kg of silicone oil solution, 1.
8,643 kg of powdered kaolin, plus 1.8,643 kg
Add the rice husk ashes little by little and stir for a few minutes. Separately, 32.886 kg of expanded perlite (SOC66) (specific gravity approximately 0.04) was placed in a drum roller type tumble mixer.
and spray the above mixture with 3 spray nozzles of 5S-8 size at approximately 2.5 kg/cn! Inject at a pressure of After the liquid mixture is completely poured into the perlite, the reinforcing fibers are gradually mixed in and stirred.

The mixture thus obtained is placed in a mold and molded under pressure, and the molded product obtained is cured at high temperature to obtain a product with excellent heat insulation properties.

This product consists of the following ingredients:

Expanded perlite 70.5 (wt%) Nylon fiber (6-13 body) 0.5 Sodium silicate 20.0 Silicone oil 1.0 Rice ash
4.0 Kaolin 4.010
0.0 [Effects of the Invention] The superiority of the product of the present invention is fully proven by its heat insulating properties through low and high temperature tests.

A low and high temperature test for insulation properties was conducted as follows.

First, a steel pipe with a diameter of 7.5 cm and a length of 3.6 m was prepared, and its outer periphery was covered with a cell glass insulation material, a polyurethane insulation material, and a heat insulation material prepared according to the present invention, respectively, with a thickness of 5 cm and a length of 1.2 m. did.

Three thermocouples are prepared in the pipe, and 3
A pair (internal and external) was installed along each section of each type of insulation. Cooling was carried out from inside the pipe at a temperature of 37.8° C. for 4 hours with temperature measurements every 15 minutes. The temperature measured outside the pipe remains almost unchanged.
It has been revealed that each of the three materials has low-temperature insulation properties.

After the low temperature test is completed, install the burner at approximately 400℃.
The inside of the pipe was heated to . After a few seconds, the bubble glass insulation cracked and separated from the pipe. The polyurethane insulation started to heat up and shrink. However, the heat insulating material according to the present invention did not exhibit structural instability such as melting, heat generation, or shrinkage. That is, it has become clear that the heat insulating material of the present invention has satisfactory characteristics at both low and high temperatures.

The product of the present invention is ultra-light ft (0,048 kg/rrf
~0.640kg/bo) and fire resistant (648~1,09
4℃), heat resistance (thermal conductivity 0.055-0.06)
8 Kcal/h/ rrf/”C/cm),
The compressive strength (3,6-20 kg/ci) is also sufficient to make panels.

In addition, the product of the present invention has excellent water resistance and temperature resistance, and can be used for roofs.

It is suitable for walls and ceilings such as exterior walls and bathrooms, does not generate condensation or mold, has sufficient sound absorption and soundproofing properties, does not distort or shrink after molding, and is easy to cut and nail. - Convenient for enforcement.

The product of the present invention has the above-mentioned characteristics and can be manufactured at a lower price than other products of this type, so it will make a significant contribution to industry.

Claims (3)

[Claims] (1) Expanded siliceous inorganic aggregate 50-70% by weight, sodium silicate 25-35% by weight, kaolin 5-12% by weight, reinforcing fiber up to 3% by weight, up to 5% by weight An insulating material with excellent nonflammability, water resistance, and sound absorption properties, consisting of a filler. (2) expanded siliceous inorganic aggregate with a weight ratio of 50 to 70%, and a weight ratio of 25 to 25% containing solids in a range of 36 to 44%;
A solution of sodium silicate in the range of 35%, weight ratio 5 to 1
Prepare a mixture consisting of kaolin in a range of 2%, reinforcing fibers in a range of up to 3% by weight, and filler in a range of up to 5% by weight, press-mold the mixture, and mold the resulting molding. A method for producing a heat insulating material with excellent nonflammability, water resistance, and sound absorption properties, which is characterized by curing the product at high temperatures. (3) The method for producing a heat insulating material with excellent nonflammability, water resistance, and sound absorption properties according to claim 2, wherein the curing at high temperature is performed in an oven at 60 to 120°C for 2 to 16 hours.