JPH01305840A - Treating material for substrate joint - Google Patents

Abstract

PURPOSE:To increase workability and adhesive property by mixing one or more kinds selected among filler, agent for providing adhesive property, viscosity controlling agent, setting modifier and coloring agent and thereafter by mixing spherical light aggregate having hollowness. CONSTITUTION:alpha-type hemihydrate gypsum base material is obtd. by regulating to 0-297mu particle size and >=0.7 bulk specific gravity. Then, the base material is mixed with one or more kinds among CaCO3, stone powder, etc., one kind of agent for providing adhesive property selected among starch, PVA, acrylate modified agent, one kind of viscosity controlling agent selected among CMC, sodium polyacrylate, one kind of setting modifier selected among citric acid, glue, etc., and coloring agent contg. iron oxide to obtain a mixture. The mixture is added with 1-20wt.% spherical light glass aggregate having hollowness such as perlite foam body having 0.1-0.5 bulk specific gravity and the particle size distribution composing of 20-30% of particle having 420-297mu particle size, 50-60% particle having 297-149mu particle size and 10-30% of particle having 149-74mu particle size, and a desired amt. of water, and kneaded to produce the treating material for substrate joint.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a joint treatment material for interior base panels of buildings, etc. - In detail, it is suitably used as a base for joints, etc. This article relates to a joint treatment material for the base.

[Prior art and issues to be solved]

Traditionally, as an interior base for buildings, etc., base panels are arranged on the wall surface, and the joints formed between these base panels are filled with β-type hemihydrate gypsum as a base material, and fillers and adhesives are applied to this base material. After filling with a base joint treatment material obtained by appropriately mixing additives such as a properties imparting agent, a viscosity modifier, a setting modifier, and a coloring agent, a finishing joint treatment material is applied on top of this with a spatula, etc. The joints were finished smooth.

However, when kneading the base joint treatment material based on β-type hemihydrate gypsum, the mercury content is 60% to 65%.
As a result, the amount of moisture evaporated during drying is large, resulting in a large thinning of the joint treatment material, which results in a large number of joint treatments (this results in poor work efficiency, and the low surface hardness makes it difficult to use finishing joint treatment materials). The problem was that it lacked adhesion with other materials.

In addition, a method has been used in which aggregate such as vermulite or powdered perlite is mixed into the joint treatment material for the base to prevent wall thinning, but in this case as well, the aggregate itself is layered or Since it is a powder, it has a high water absorption rate and therefore increases the amount of water mixed in, so it cannot be said to be effective as a means for preventing double oxidation.

[Means for solving problems]

Therefore, the base joint treatment material according to the present invention has a particle size of 0 to 0.
The base material is α-type hemihydrate gypsum, which is in the range of 297μ and whose bulk specific gravity is adjusted to be 0.7 or more, and this base material is filled with fillers, adhesion agents, viscosity modifiers, and setting modifiers. , by mixing one or more types of colorants and further mixing a predetermined amount of hollow spherical lightweight aggregate to obtain a joint treatment material for bases with less doubleness. The purpose is to improve work efficiency and to improve adhesion to the base panel and finishing joint treatment material.

To explain the present invention in more detail, α-type hemihydrate gypsum has a well-organized crystal structure compared to β-type hemihydrate gypsum, so it requires less water to be mixed with it, and therefore has less double hydration and hardness. Focusing on its high properties, we used α-type hemihydrate gypsum as a base material, used one or more of calcium carbonate, trihydrate gypsum, stone powder, etc. as a filler, and starch as an adhesive agent. , vinyl acetate, polyvinyl alcohol, vinyl acetate modified products, acrylic modified products, etc., and as a viscosity modifier, any one of carboxymethyl cellulose, methyl cellulose, sodium polyacrylate, etc., for coagulation adjustment. As an agent, any one of citric acid, citrates, gelatin, or a protein type such as glue is used as a coloring agent, and as a coloring agent, a coloring agent containing iron oxide as a main component is added.
．． 1 to 0.5 and the ratio of particle size distribution is 420 to 297μ...20 to 30%297 to 1
49μ...50~60%149~74μ...
...Add 1 to 20% of hollow, spherical lightweight aggregate made of glass such as pearlite foam or volcanic foam adjusted to 10 to 30%, and mix with a predetermined amount of water. do.

The joint treatment material constructed in this way has an increased supporting capacity, and since the lightweight aggregate has a property of not easily absorbing water, the total amount of mixed water can be reduced, and therefore, there is less double lining, and it has good adhesive properties. is good. However, in this case, if the lightweight aggregate is less than 1% of the total amount, it will have little effect, and if it exceeds 20%, it will be difficult to knead unless the amount of water mixed is significantly increased, which may cause problems. Become. Furthermore, even if the bulk specific gravity and particle size distribution of lightweight aggregate exceed the specified range, or if the bulk specific gravity of α-type hemihydrate gypsum is less than 0.7 or more than 0.7, the particle size distribution is 297μ.
If the cross line width exceeds , the cross line width increases and the surface hardness and adhesiveness decrease.

In this case, the lightweight aggregate is not limited to pearlite foam or volcanic foam, as long as it satisfies the above particle size and bulk specific gravity and has similar properties; for example, synthetic resin spheres, etc. But that's fine.

When using the base joint treatment material obtained in this way, fill the joints of the interior base panel, let it dry, and then apply the finishing joint treatment material to the surface of this base joint treatment material with a spatula, etc. Finish the joint surface smoothly. It goes without saying that the base joint treatment material according to the present invention can also be suitably used, for example, for repairing base panels.

Next, the present invention will be explained in more detail with reference to Examples.

[Example 1] First, as shown in Table 1, as an example, four types of α-type hemihydrate gypsum with different bulk specific gravity and particle size distribution ratios were used as base materials, and a predetermined proportion was added to each base material. The joint treatment material for the base was adjusted by mixing spherical perlite and
Examples ■～■).

Comparative examples include a base joint treatment material based on β-type hemihydrate gypsum (Comparative Example ■), a base joint treatment material containing vermulite or powdered pearlite as a lightweight aggregate (Comparative Example ■■), and Base joint treatment material based on α-type hemihydrate gypsum with a specific gravity of less than 0.7 (comparative example ■) and a particle size of 29
This figure shows a base joint treatment material (Comparative Example ■) that uses α-type hemihydrate gypsum as a base material with a diameter of 7μ or more.

The additives 5 include calcium carbonate, polyvinyl alcohol (PVA), methyl cellulose (MC),
Using citric acid and iron oxide/ / Table 1 Mixing ratio table 3 Test results (Note) ■ Setting time is in accordance with JIS 86904 gypsum plaster setting test method.

2. The surface condition is 450mm long and 10mm wide on the base panel.
Apply the base joint treatment material evenly to a thickness of 0 mm and 2 cm, and after curing for 1 day in a curing room (temperature 20℃ ± 2. humidity 65% ± 10),
Judge by touch.

3. Surface hardness is measured using a scratch hardness meter.

4. Both sides are 300mm long, 20mm wide, and 20mm deep.
After filling the joint treatment material with a spatula into the joint set in
Joint treatment and curing are repeated until the joint area is flat, and the number of times is displayed.

5. Adhesiveness is as follows: fl) Adhesive strength to base panel JIS A6915 Thick finish coating adhesion strength test method.

(2) Adhesive strength with finishing joint treatment material Same as (1) above.

(3) Adhesion condition Paste the cloth and remove the cloth after one day. Cross lining paper that adheres to the joint treatment material Judgment is made by the adhering dust.

〔Effect of the invention〕

According to the above test results (Table 3), compared to the comparative example using β-type hemihydrate gypsum and the comparative example using α-type hemihydrate gypsum mixed with vermulite or powdered pearlite, spherical pearlite was added to α-type hemihydrate gypsum. Examples of the present invention containing
Since it has a low degree of both sides, if you use this base joint treatment material and finishing joint treatment material together to treat the joints of the base panel, you only need to do the work once for the base panel, so it is extremely efficient. Moreover, it can be seen that the adhesion to the base material and finishing joint treatment material is extremely excellent.

Claims (1)

[Claims] (1) A base material is α-type hemihydrate gypsum with a particle size in the range of 0 to 297μ and a bulk specific gravity of 0.7 or more, and a filler, an adhesion imparting agent, A joint treatment material for a base, characterized in that it contains one or more of a viscosity modifier, a setting modifier, and a coloring agent, and further contains a predetermined amount of hollow, spherical lightweight aggregate.