JPS58140356A - Lining material - 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 lining material, and more particularly to a lining material that uses sodium silicate and granulated blast furnace slag in combination as a binder and has high chemical resistance and heat resistance.

Iron plates used under harsh conditions such as flues, exhaust gas dust collectors, devalue devices, waste liquid treatment tanks, industrial kilns, tanks in factories that use acids, floors, walls, pits, etc. ,concrete,
In order to protect the surface of a base material such as a brick, lining with a material having chemical resistance or heat resistance is performed.

Conventionally, lining materials have been classified into silicate-based materials and hepta-mention-based materials, depending on the type of binder used. The former has the disadvantage of being acid resistant but weak against alkaline solutions and force, and conversely, f& is strong against alkalis but easily attacked by acids.As a solution to the disadvantages of both, sodium silicate and It has been proposed to use alumina cement in combination (Japanese Unexamined Patent Publication No. 106524/1983). However, even this lining material does not have sufficient acid resistance and heat resistance, and there is a strong demand for improvement.

As a result of various studies to meet these demands, the inventor of the present invention found that, in a lining material that uses both sodium silicate and alumina cement, the alumina cement is partially or completely replaced with granulated blast furnace slag powder and its alkali. The present invention was completed based on the discovery that excellent acid resistance and heat resistance could be imparted by replacing the binder with a stimulant.

That is, the present invention is a lining material comprising aggregate, sodium silicate, a hardening accelerator of sodium silicate, granulated blast furnace slag powder, and an alkali stimulant.The present invention will now be described in detail.

In the present invention, the aggregates include quartz layer powder, asbestos powder, crow powder, silica sand powder, carbon powder, cerben, clayey chamotte, alumina chamotte, vermiculite,
Acid-resistant aggregates and heat-resistant aggregates such as perlite, anti-flinder stone, and pumice are preferably used.

As the sodium silicate, at least one heel of sodium metasilicate or sodium silicate No. 1 to No. 3 is used, and the ratio thereof is preferably 5 to 1 part by weight per 100 parts by weight of the aggregate. If the amount is less than that of the 5-shaped broken part, the strength of the lining material will be poor, and there is no advantage in adding soo't in a significantly larger amount than that of the broken part, and the acid resistance and heat resistance will be reduced. From the viewpoint of strength development and acid resistance, it is desirable to use sodium metasilicate and sodium silicate together.

As the curing accelerator for sodium silicate, conventionally known ones may be used. Specific examples include inorganic ones such as alkali silicate fluorides such as sodium silicate and potassium silicate fluoride,
Examples of seminal substances such as calcium silicate, aluminum phosphate, and condensed aluminum phosphate include fatty acid amides and fatty acid esters, and among them, aluminum phosphate and condensed aluminum phosphate are preferred. One or more of these curing accelerators should be added in an amount of 1 part per 100 tIt parts of sodium silicate.
0 to 150 heavy losses, use once.

Granulated blast furnace slag is a necessary component to impart chemical resistance such as alkali resistance and acid resistance to the lining material, as well as heat resistance, and the alkaline stimulant activates the water utilization reaction to quickly strengthen the lining material. It is necessary for it to manifest itself.

As for the granulated blast furnace slag, it is possible to use ordinary granulated blast furnace slag that is used as a secondary product during steel manufacturing, and it is preferable that the granulated blast furnace slag has a smaller particle size because the hydration reaction is faster.
54 is sufficient. The amount of granulated blast furnace slag powder to be used is about 5 to 500 parts by weight per 100-weight pupil of the aggregate. If the amount is less than 5 parts, the strength of the lining material will be poor, and there is no advantage to mixing more than 500 parts, but rather the chemical resistance tends to decrease.

As alkali stimulants, alkali metals such as alkaline earth metal hydroxides, carbonates, and sulfates, and Portland cement are used [in particular, sodium hydroxide is a strong alkali and is not readily available]. Since it is easy, it is suitable for industrial use.

Furthermore, by using sodium hydroxide together with sodium carbonate or sodium bicarbonate, long-term strength can be improved, so there is the advantage that a lining material with greater durability can be made. be.

The amount of alkaline stimulant used is 100 ml of granulated blast furnace slag powder.
It is preferably 3 to 10 parts by weight based on the +tt parts. If the amount is less than 3 parts by weight, strength development will be poor, and if it exceeds 10 parts by weight, no increase in strength can be expected. The lining material consisting of each of the above components is mixed with appropriate amounts of water to form a mortar, applied to an article requiring lining, and cured before use. At this time, each component of the lining may be mixed in advance, or may be mixed at the time of kneading with water.

Since the lining material of the present invention uses one part of a two-part binder, when mixed with water, two curing reactions proceed simultaneously. Therefore, the curing time and workability can be freely adjusted by changing their blending ratio. Moreover, since these binders are those that are mixed with water in an appropriate amount and harden at room temperature, any construction method can be employed.

In addition, 5BIL and NBR are used as the lining material of the present invention.

C) Combining latex such as L and EVA 1
This makes the organization more compact and significantly suppresses intrusion from the outside.
It not only further increases chemical resistance but also improves workability, adhesion, and crack resistance.

Furthermore, fluidity can be increased by adding cement water reducers (dispersants) and organic acids such as gluconic acid, citric acid, tartaric acid, or their salts, and by adding alumina cement. , heat resistance at high temperatures can be improved.

According to the product of the present invention, it is possible to significantly improve acid resistance and heat resistance, and this improvement is useful in that it can be achieved using granulated blast furnace slag, which is an industrial by-product. .

The present invention will be further explained below with reference to Examples.

Example 1 Lining material 1ooott consisting of the compounding ratio shown in Table 1
16 parts by weight of water was added to the mixture and mixed with a mortar mixer to form a mortar, which was lined with a trowel to a thickness of 5W and left for 24 hours. Corrosion resistance, shear adhesive strength, shrinkage rate, and crank occurrence rate were measured for this lining product.

As a comparative example, measurements were also carried out using sodium silicate and alumina cement as binders. These results are shown in Table 1.

Corrosion resistance is determined by the heavy liquid reduction rate when the surface of the lining material is immersed in a 9D C110% sulfuric acid aqueous solution for 6 hours, the shear adhesive strength and shrinkage rate are measured values after being left at 500 C for 24 hours, and the occurrence of cracks is determined by the values measured at 500 C. This was shown by visual observation after being left for 2 weeks.

Table 1 Example 2 Mortar prepared with the lining material shown in Table 2 was troweled to a thickness of 50 mm on an iron plate, and the same physical properties as in Example 1 were measured. The results are shown in Table 2.

Corrosion resistance was measured under the same conditions as in Example 1, shear adhesive strength and shrinkage were measured after being left at 160 C for 24 hours, and crack occurrence was observed with the naked eye after being left at 160 C for 2 weeks.

As shown in Table 2, the product of the present invention has excellent corrosion resistance, adhesion, and crack resistance, and is a lining material that can be used in a wide variety of fields.

Patent applicant: Denki Kagaku Kogyo Co., Ltd.

Claims (1)

[Claims] A lining material containing aggregate, sodium silicate, a sodium silicate hardening accelerator, granulated blast furnace slag powder, and an alkali stimulant.