JPS58190854A - Coating material for low temperature liquid tank supporting wall - 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 The present invention relates to a coating material for retaining walls of a low-temperature formed tank that has excellent low-temperature coating resistance. Furthermore, the present invention aims to provide an innovative coating material that exhibits extremely good fireproof and heat-insulating performance even if the liquid is flammable and burns.

Traditionally, considerable widths of thick concrete have been used as protective walls for storage tanks for cryogenic liquids such as liquid oxygen, liquid nitrogen, LPG, LNG, etc. This concrete is very useful as a construction material for retaining walls, but when a single piece of low-Ai leaks from a tank or combusts at the same time as it leaks, the sudden temperature change causes cracks and explosions, causing it to leak to the outside. Because it is easy to take out, a covering material is applied to the inner surface,
In terms of construction methods, concrete blocks are used as sandwich materials and formwork, and concrete 1 is poured into the space. However, there are very few such concrete blocks or conventional covering materials that are suitable for such uses.For example, organic insulation materials are highly dangerous in the event of a fire, and lightweight mortar and other materials coated with organic materials are not suitable for such uses. It had the drawbacks of being prone to low-temperature breakdown and not having as good insulation properties.

The present invention makes it possible to overcome the above-mentioned disadvantages and achieves the object by applying a specific foam to the inner surface of the retaining wall of a cryogenic liquid tank.

That is, the present invention relates to a new coating material for attaching a molded plate of a specific foam to the inner surface of a cryogenic liquid tank retaining wall or for applying a composition capable of forming a foam with a liquid, (A)
■ An aqueous solution of an acid with an am constant (pKa) of 0 or less at -23°C and a pH of 3 or less, and a chain acid having at least one type of basicity selected from anhydrous alkali silicates and cement. Hardening agent, or ■ water-soluble alkali silicate, cement, silica dust, zinc oxide, I! + Divalent or higher valent metal salts of primary fatty acids, divalent or higher valent metal salts of water-soluble polymer substances having carboxyl groups, acidic metal oxides, phosphates, sulfates or sulfites of divalent metals, and boric acid It is a hardening agent for water-soluble alkali silicates, which is at least one type of salt! Component system: Reactive curable component (hereinafter referred to as component (A)), (B) metallic foaming agent (hereinafter referred to as component (B)), and (C) diorica gel, ze-lite, activated carbon, carbon black, talc. , mica, palygorskite and sepiolite, and at least one foaming stabilizer selected from surfactants (
Hereinafter, it will be referred to as component (C). ) is the main component.

The constituent components of the material to be treated according to the present invention will be briefly explained. (
There are two types of two-component reactive curable compositions of component A), and the system Φ mentioned above is assumed to be cured by an acid-base liquid surface reaction, and the system 2 is cured by a water-soluble alkali silicate gel coagulation reaction. be done. Examples of acids of the type (2) include phosphoric acid, acidic phosphates such as zinc pyrophosphate, and organic acids such as formic acid, glycolic acid, and cyanoacetic acid. Examples of the acid curing agent of the system (2) include anhydrous alkali silicates such as water glass cullet, and cements such as Portland cement, fly ash cement, and alumina cement, among which at least /N is used. Next, as the water-soluble alkali silicates of the system (■), Li2O.5i02, Na2O.5102,
(NH4) 20 .5j02 is an example, and it is assumed that it is always water-soluble. As the water-soluble alkali silicate curing agent of the system (2), those specifically listed above can be used. (A) of the series of or O such as
Component (B), which is a powder of an elemental metal, an intermetallic compound, or an alloy, and component (C), which is a powder or liquid of the components specifically listed above, are mixed into a phlegm paste through water. As time passes, the mixture begins to foam,
After foaming is completed, it gradually begins to harden. Although such a reaction varies depending on the types and amounts of the ingredients, foaming usually starts in 5 to 20 minutes at room temperature, and complete curing is completed after 21 hours at the latest.

When applying the above-mentioned coating material to the holding guard of a low-temperature liquid tank, the above-mentioned components (A) to (C) are mixed and injected in a molding frame in advance, and then foamed and hardened to form a molded plate and affixed to all the structures. Or, a mounting method, a method of attaching a formwork to a structural wall and injecting the paste of the components (A) to (C) into the hollow part, a method of injecting the paste of the components (A) to (C) into the structural wall directly or through a lath, etc. You can freely choose how to apply it, such as by spraying or using a trowel. After the inorganic foam is coated on the structural wall in this way, in addition to leaving the covering material as it is, the surface of the covering material is coated with a protective coating material to ensure durability and weather resistance, or the surface of the covering material is protected. The beauty and protection of the inner surface of the retaining wall can be achieved by covering it with sheets or boards, or by leaving the durable formwork as it is.

The cryogenic liquid tank retaining wall obtained in this way has been found through extensive experiments to have good stability at low temperatures and to withstand fire and high heat.
This will not cause cracks or explosions in the structural walls, and will greatly help improve disaster prevention performance as well as disaster prevention technology.

The experiment is shown below.

Sample I@1 (freeze-thaw test) Samples/~10 shown below were cut or molded into vM composite shapes to obtain specimens with dimensions of 200 x 700 x 30 mm.

After curing these specimens in air at room temperature for two weeks, IlO
A process of immersion in a constant-temperature water cap at
) A cyclic freeze-thaw test consisting of a step of immersing the sample in water for about 3 minutes was conducted for 5 cycles, and the specimens after each cycle were as shown in Table 1.

Trial m1: 5i02/Na2O molar ratio! Produced by mixing 1 part by weight of anhydrous sodium silicate, 730 parts by weight of aluminum orthophosphate (concentration 30%, 2 parts by weight of metal silicon powder, and 1 part by weight of silica gel powder. The specific gravity of the foam is 0. It became .35.

Sample 2: 700 parts by weight of sodium silicate (concentration 30%) with S+02/Na2O molar ratio of 2.5, alumina cement <zoits, 70 parts by weight of Portland cement, Fe
Manufactured by mixing 3 parts by weight of 5t powder and 5 parts by weight of palygorskite powder.

The foam had a specific gravity of 0.35.

Sample 3: 700 parts by weight of sodium silicate (concentration 30%) with a 5i02/Na2O molar ratio of 2.0, 10 parts by weight of 5i0293% silica dust by-produced during pesiWM, 10 parts dispersed in zinc oxide lON, metal aluminum Manufactured by mixing 2 parts by weight and 2 parts by weight of sepiolite. The specific gravity of the foam was 0.57.

Test 14: Calcium silicate heat insulation board No. 7 specified in JIS A 9510, specific gravity 0.230 Sample 5: Standard cement mortar board (1 cement to 3 standard sand), specific gravity 2.0° Test a, 6: JIS A 6904 Specimen 7: JIS A 5416 JIS A 5416 standard Gypsum plaster with a specific gravity of 0.3K.

Sample 8: A cement foam manufactured by mixing 100 parts of Boltland cement, 1 part by weight of aluminum metal, part by weight of polyvinyl alcohol, and 50 parts by weight of water, and has a specific gravity of 0.73. - Sample 9: Boltland cement 00 heavy area, metal aluminum powder 0. / parts by weight and 50 parts by weight of water to produce a cement foam with a specific gravity of 0.
．． This is Otsu S.

Sample 10: 700 parts by weight of Boltland cement, 50 parts by weight of water
Perlite-mortar produced by mixing 20 parts by weight of foamed pearlite and 20 parts by weight of foamed pearlite has a specific gravity of /, /2.

Chapter / Table Psych,.

/23113 Sample 1 00000 Sample 2 00000 Sample 3 00000 Sample 4 indicates that a crack has occurred, and a - symbol indicates that the test cannot be continued.

Experiment 2 (heating test) According to the method of Experiment 1, the dimensions were 200x200x100n.
Ten specimens of m were obtained. These specimens were air-cured at room temperature for two weeks, and thermocouples were installed on both sides of the diameter and width of 100 mm, and one side was maintained at 1ooo~/100℃.
A G gas burner was applied, the other side (back side) was kept warm with a fireproof insulating brick, and the temperature rise on the back side after heating for g hours was measured, and the results shown in Table 2 were obtained.

Table 2 that's all Patent applicant Shikoku Kaken Kogyo Co., Ltd. ／　／

Claims (1)

[Claims] 1. (, A) A two-component reaction-curing composition having ■ or Φ as described below: Electrical w1 constant (pKa) at 025°C ff111
．． A curing agent of a chain acid having at least one type of basicity selected from anhydrous alkali silicates and cement; ■ water-soluble alkali silicates, cement, and silica; Dust, zinc oxide, divalent or higher valent metal salts of higher fatty acids, divalent or higher valent metal salts of water-soluble polymer substances having carboxyl groups, acidic metal oxides, phosphates, sulfates or sulfites of divalent metals and at least one type of water-soluble alkali silicate curing agent selected from borates, (B) a metal foaming agent, and (C) silica gel, zeolite, activated carbon, carbon black, talc, mica, palygorskite, sepiolite. A coating material for a retaining wall of a low-temperature liquid tank, the main component being at least one foaming stabilizer selected from surfactants and surfactants.