JPS583502B2 - Painting material - Google Patents

Description

[Detailed Description of the Invention] It has already become common to mix synthetic resin with Boltland cement and use it as a decorative material, but such decorative materials have many drawbacks and demand will gradually decline. The current situation is that

When ordinary Portland cement is used as the main material, its shrinkage rate is high and cracks occur, which causes peeling.Furthermore, efflorescence occurs, which is a fatal defect for decorative materials. As a result of this decrease, an efflorescence phenomenon inevitably occurs, rendering the cosmetic material useless.

These phenomena cannot be prevented simply by adding a synthetic resin to ordinary Boltland cement, and are a problem of the essence of Boltland cement.

The present invention relates to a coating material that eliminates the above-mentioned drawbacks, and is characterized by a high sulfate coating material made by adding an appropriate amount of lime and gypsum to blast furnace slag, and if necessary, an extender such as clay. The composition is such that a water-soluble powdered synthetic resin is added to the slag cement at a solid content of 0.5 to 15% by weight based on the high sulfate slag cement.

Therefore, the proportion of blast furnace slag in the high sulfate slag cement is preferably 80% or more, and lime and gypsum as stimulants may be added to this.

This high sulfate slag cement is produced by the reaction of slag with lime and gypsum.
Hardened by aS04,31H20.

In the above-mentioned coating material of the present invention, the generated Ettrin guide has expandability, which prevents the occurrence of cracks, and once coated, there is almost no peeling.

Moreover, this expandability is not only useful as a decorative material.
It can also be used as a joint material to prevent so-called thinning of the joint area.

Next is the occurrence of efflorescence. This is because calcium hydroxide has a high solubility at low temperatures, so it dissolves in the water contained in the hardened cement or water from the outside and oozes out to the surface. occurs in

However, in the case of the present invention, the movement of water in the hardened cement is stopped by the addition of synthetic resin, and essentially, lime and gypsum, which are the sources of efflorescence, are Since the amount of calcium hydroxide is low and it is mixed in simply as an irritant, less calcium hydroxide is produced and efflorescence is less likely to occur.This, combined with the addition of synthetic resin, causes efflorescence. The occurrence of can be more effectively prevented.

In addition, high sulfate slag cement hardens more slowly than Boltland cement and tends to cause dryout after construction; however, according to the present invention, by adding resin, a resin film can be formed on the surface of the high sulfate slag cement mortar. is formed, which suppresses the evaporation of water and has the effect of preventing dryout.

The amount of water-soluble powder synthetic resin added to high sulfate slag cement is 0.5% to 15% of the solid content of the cement, and the types of synthetic resin include complex acid vinyl, melamine, etc. Single substances or mixtures of resins, ethylene complex acid vinyl, acrylic resin polymers, etc. are used.

This decorative material can also be used as a base conditioning material.

Next, an example will be described in which a general Bortland cement mortar and a high sulfate slag cement mortar of the present invention are compared under conditions where the Nikka phenomenon is most likely to occur.

Specimen ■ (Conventional) Boltland cement 100g (manufactured by Sumitomo Cement Co., Ltd.) Silica sand No. 6 30g Silica sand No. 7
70g water retention agent
0.2g (Hoechst Narrowse MHIOOOP (cellulose ether) Colorant (carbon black) 10g water
40g specimen ■ (of the present invention) Silica sand No. 6 30g Silica sand 7
No. 70. g Colorant (carbon black) 10g water-soluble resin powder
10g (DM20 manufactured by Hoechst)
0 (Copolymer resin powder mainly made of vinyl acetate)) Water retention agent 0.2g (Narose MH1000P (cellulose ether) manufactured by Hoechst) Water 40g
The specimen of Wangji ■■ was applied to an asbestos cement board at a coating thickness of 3 mm.

Immediately after coating, all specimens exhibited a jet black surface color, and it was difficult to distinguish between specimens ■ and ■.

However, after 1 hour of coating and before it was completely cured, these samples were cured in a thermostatic chamber at a room temperature of 5 DEG C., a wind speed of 1 to 2 m, and a standing period of 7 days, and then taken out and their surfaces were observed.

As a result, efflorescence occurred throughout the clothing of the specimen (■), and the surface color was almost white.

The surface color of specimen (1) was almost the same as that immediately after application, but as the water evaporated during curing, it became a matte black state, and no occurrence of efflorescence was observed.

Although a water-soluble powder is used as the synthetic resin in the above example, the same action and effect can be achieved even when a synthetic resin emulsion is used as an equivalent substitute.

Claims (1)

[Claims] 1 Add water-soluble synthetic resin powder to high sulfate slag cement made by adding appropriate amounts of lime and gypsum to blast furnace slag so that the weight ratio of the solid content to the high sulfate slag cement is 0.5 to 15%. A coating material made by adding.