JPH01115854A - Wet-type premix material - Google Patents

Abstract

PURPOSE:To enable good storage of wet-type premix for a long period of time, by adding a substance forming calcium complex salt to a wet-type premix for roofing with tiles. CONSTITUTION:The subject premix is obtained by adding 0.1-5wt.% of a substance forming calcium complex salt at a pH over 12, to a wet-type premix in the form of paste, which is formed by mixing water with a composition containing dolomite plaster and slaked lime, as major components, additionally fine aggregate and light-weight aggregate whose particle size is adjusted, adhesive, pigments and fungicide. The additive is preferably polysaccharide such as sucrose or molasses.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a wet premix material used by plasterers, roofers, etc.

[Conventional technology] Conventionally, when roof tiles are laid, green tiles are laminated and fixed to the ridge of the roof, but a wet premix material is sometimes used to fix the green tiles. This type of wet premix material is made by mixing Dolomy 1 plaster and slaked lime as the main ingredients with water and making a paste of viscosity-adjusted fine aggregate, lightweight aggregate, adhesives, pigments, antifungal agents, etc. It is sold in a plastic bag or container in suitable quantities so that it can be used immediately on site.

[Problems to be Solved by the Invention] However, the wet premix materials packed in bags or containers usually solidify in about 10 to 15 days,
There is a problem that it has poor storage stability.

[Means for solving the problem] In order to solve this problem, we experimented by mixing various drugs and compounds into the premix, and found that when we added substances that form calcium complex salts, it did not solidify and could last for a long time. was found to be significantly improved. It has also been found that polysaccharides are suitable as the additive, and the shelf life can be adjusted by increasing or decreasing the amount of polysaccharides mixed in. However, it has been found that adding too much causes the inconvenience of hard solidification.

That is, the present invention is a wet method which is made of dolomite plaster, slaked lime as the main component, viscosity-adjusted fine aggregate, lightweight aggregate, adhesive, pigment, fungicide, etc., and is softened with water to form a paste. In the premix material, add an additive that forms a complex salt of nocolsium at a pH of 12 or higher with a weight ω ratio of 0.1 to
The gist is that 5% was mixed in.

[Function] When an appropriate amount of an additive that forms a complex salt of calcium is mixed into the wet premix material as described above, it can be stored for about 3 to 6 months without hardening.

[Example] Next, an example of the present invention will be described. Among the constituent members, dolomite plaster was used that met the standards of JIS A6903, slaked lime was used that met the standards of JIS A 6902, and the aggregate was fine. Aggregate (particle size 0,1~
1.5 mm) and lightweight aggregate (particle size 0.3 to 2. These include vermiculite and shirasu balloons.

The adhesive is water-soluble or emulsion type. (a) Water-soluble polymers include PVA, methyl cellulose, carboxymethyl cellulose, acrylic acid polymers, natural polymers (starch, (b) Synthetic resin emulsions include vinyl acetate, vinyl acetate/ethylene copolymer, acrylic ester, styrene/acrylic ester copolymer, urethane, and epoxy. , SBR type, etc.

As an additional aid, Dabanbu antifreeze is used during the winter.

As for the susa described later, hemp fibers, synthetic fibers, etc. are mainly used, and as additive polysaccharides, sugar, molasses, etc. are used, and in some cases, alcohols are also used.

(Example 1) An example of the composition for roofing tiles is shown below.

(in g) Fine aggregate (river sand) particle size 0.1-1.5011 60
．． 0 Dolomite plaster 40.0 Polysaccharide (sugar) 0.8 Straw length (hemp fiber) 1.0 Adhesive (methyl cellulose) 0.1 Antifreeze agent (Manol liquid) 3.0 Synthetic resin (acetic acid biethylene emulsion) 3.0 Colored pigment 0.3 Antifungal agent
0,01 water
15.O These were uniformly mixed at a factory to form a paste, and the paste was sealed in a water-resistant packaging bag in the same manner as before.

This wet premix material is transported to the actual construction site,
When I had a roofing contractor use it, it worked well.
The surface finished with a trowel was also beautiful.

The surface strength appeared in about a week, and as the days passed, it gradually solidified and the strength increased.

Furthermore, the storage period in the warehouse was about 100 days.

(Example 2) A formulation example when used as a plastering material is as follows.

(K(1) Fine aggregate (silica sand or anhydrite) particle size 0.1 to 1.5 mm6
0,0 Lightweight aggregate (perlite) particle size 0.3 to 2.0mm2,
0 Dolomite plaster or slaked lime 40.0 Polysaccharide (white sugar) 0.8 Adhesive (methyl cellulose) 0.1 Synthetic resin (Biethylene acetate emulsion) 3.0 Color pigment 0.3 Water
15.0
In the same manner as above, the mixture was uniformly mixed at the factory to form a base mill shape, and the mixture was stored in a water-resistant packaging bag.

When this was used by a plasterer at a construction site, good results were obtained in terms of workability and finish, and it could be stored in a warehouse for about 100 days.

The composition of dolomite plaster varies depending on the firing temperature, but the current product is mostly calcium hydroxide Ca(Off)2, with some magnesium oxide H(Off)2.
0 and magnesium hydroxide +4 (+(O1+)2), and when magnesium oxide changes to magnesium hydroxide, it absorbs water and progresses to assimilation.
This solidification phenomenon can be made difficult to change the viscosity of the dolomite plaster paste by avoiding the coexistence of additives that form complex salts with magnesium at pulo, s or higher. 12.5～
12.6) Under the conditions, adding an additive that converts calci cum into a complex salt has the effect of preventing solidification.

Substances that form calcium complex salts at pH 12 or higher include sugar, gluconic acid and its salts, 2-ketogluconic acid and its salts, tartaric acid and its salts, citric acid and its salts, but among these, the cheapest is It is sugar, and from the point of view of price, it is an excellent additive to the premix material mentioned above. Also, when sugar is added, the calcium saccharate (complex salt of sugar and calcium hydroxide) becomes p
Under conditions of H12 or higher, the effect of delaying the change of magnesium oxide to magnesium hydroxide, which causes solidification, as described above, was observed, and from this point of view, sugar is added to prevent the solidification of the premix material. was found to be optimal.

[Effects of the Invention] As explained above, according to the present invention, by mixing an appropriate amount (0.1 to 5% in weight ratio) of an additive that forms a calcium complex salt at a pH of 12 or higher into a wet premix,
Conventionally, it hardened within 10 to 15 days, but now it is possible to store it for a long time without hardening for 3 to 6 months, which is a huge benefit for manufacturers, users, and distributors alike. play.

Claims (1)

[Claims] A wet premix material whose main ingredients are dolomite plaster and slaked lime, mixed with water and formed into a paste with viscosity-adjusted fine aggregate, lightweight aggregate, adhesives, pigments, antifungal agents, etc. A wet premix material characterized by containing 0.1 to 5% by weight of an additive that forms a complex salt of calcium at a pH of 12 or higher.