JPH064780B2 - Building finish - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a building finish, and more particularly to a building finish that gives a cured product that has very little shrinkage during curing and therefore does not crack. .

[Problems to be Solved by Conventional Techniques and Inventions] When a cement compound such as cement paste or mortar is used to finish a building, when such a cement compound cures, it shrinks and hardens. It is an unavoidable phenomenon that the strength is deteriorated because a crack is generated in an object.
For this reason, it has been practiced to add a specific substance to the cement mixture to suppress shrinkage during curing as much as possible.
As such an additive, a prepolymer obtained by reacting a polyisocyanate compound with a copolymer of a polyalkylene glycol such as ethylene glycol and an alkylene oxide such as ethylene oxide has been known (Japanese Patent Laid-Open No. 50-139121). Issue). However, when a cement mixture containing this prepolymer as an additive is used as a building finishing agent, the suppression of shrinkage of the cement mixture during curing is not satisfactory, and there is room for improvement.

The present invention solves the above-mentioned conventional drawbacks, and provides a building finishing agent with less shrinkage during curing and without cracking.

[Means for Solving Problems] That is, the present invention is a building finishing agent comprising a cement mixture, a hydroxyl group-containing liquid diene polymer and a polyisocyanate compound.

As the cement mixture used in the present invention, various ones can be used, but for example, a cement paste containing cement and water or a mortar containing cement, sand and water is preferably used. As for the type of cement used here, any known one can be used. For example, natural cement, Portland cement, Roman cement, alumina cement, magnesia cement and the like can be mentioned as suitable ones.

The hydroxyl group-containing liquid diene polymer used in the present invention has a number average molecular weight of having a hydroxyl group in the molecule or at the molecular end.
A liquid diene polymer of 300 to 25,000, preferably 500 to 10,000 is used. Here, the hydroxyl group content is usually 0.1 to 10 m.
eq / g, preferably 0.3 to 7 meq / g.

These liquid diene-based polymers include diene polymers having 4 to 12 carbon atoms, diene copolymers, and copolymers of these diene monomers and α-olefin addition addition polymerizable monomers having 2 to 22 carbon atoms. and so on. Specifically, butadiene homopolymer, isoprene homopolymer, butadiene-styrene copolymer, butadiene-isoprene copolymer, butadiene-acrylonitrile copolymer, butadiene-2-ethylhexyl acrylate copolymer,
A butadiene-n-octadecyl acrylate copolymer etc. can be illustrated. These liquid diene polymers can be produced, for example, by reacting a conjugated diene monomer in a liquid reaction medium in the presence of hydrogen peroxide with heating.

The polyisocyanate compound is an organic compound having two or more isocyanate groups in one molecule and has a reactive isocyanate group for the hydroxyl group of the hydroxyl group-containing liquid diene polymer. Examples of the polyisocyanate compound include ordinary aromatic, aliphatic and alicyclic compounds such as tolylene diisocyanate, hexamethylene diisocyanate, diphenylmethane diisocyanate (MDI), liquid modified diphenylmethane diisocyanate and polymethylene polyisocyanate. Phenyl isocyanate, xylylene diisocyanate, cyclohexyl diisocyanate, cyclohexane phenylene diisocyanate, naphthalene-1,5-
Diisocyanate, isopropylbenzene-2,4-diisocyanate, polypropylene glycol and tolylene diisocyanate addition reaction products, among others, MDI,
Liquid modified diphenylmethane diisocyanate, tolylene diisocyanate and the like are preferable.

The mixing ratio of the hydroxyl group-containing liquid diene polymer and the polyisocyanate compound is not particularly limited, but usually the molar ratio of the hydroxyl group (OH) of the hydroxyl group-containing liquid diene polymer and the isocyanate group (NCO) of the polyisocyanate compound. Is NCO / O
H = 0.2 to 25, preferably 0.5 to 15. When the molar ratio is 0.2 or less, it becomes difficult to cure, and when it is 15 or more, it is difficult to obtain desired physical properties, which is not preferable.

Regarding the mixing ratio of the above-mentioned cement mixture and the above-mentioned two components, the total amount of the above-mentioned two components is usually 3-500 parts by weight, preferably 5-100, relative to 100 parts by weight of the cement mixture.
Make sure to use parts by weight.

The finishing agent of the present invention is composed of the above-mentioned three components as essential components. However, if necessary, the following polyol compound or polyamine compound may be added as a reinforcing agent, and various other components may be added as necessary. Additives can be added.

The polyol compound is not particularly limited, and any of primary polyol, secondary polyol, and tertiary polyol may be used. Specifically, for example, 1,2-propylene glycol, dipropylene glycol, 1,2-butanediol, 1,3-butanediol, 2,3-butanediol, 1,2-
Pentadiol, 2,3-pentanediol, 2,5-hexanediol, 2,4-hexanediol, 2-ethyl-1,3
-Hexanediol, cyclohexanediol, glycerin, N, N-bis-2-hydroxypropylaniline,
Mention may be made of low molecular weight polyols containing hydroxyl groups bonded to at least one secondary carbon such as N, N'-bishydroxyisopropyl-2-methylpiperazine, propylene oxide adducts of bisphenol A and the like.

Further, as the polyol, ethylene glycol, 1,3-propylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol or the like which does not have a hydroxyl group bonded to secondary carbon can be used. . A diol is usually used as the polyol,
Triol or tetraol may be used, and the molecular weight thereof is in the range of 50 to 500.

The polyamine compound may be diamine, triamine or tetraamine. Furthermore, any of primary polyamine, secondary polyamine, and tertiary polyamine can be used. As the polyamine compound, for example,
Hexamethylenediamine and other aliphatic amines; 3,3'-dimethyl;4,4'-diaminodicyclohexylmethane and other alicyclic amines; 4,4'-diaminodiphenyl and other aromatic amines; 2,4,6- Examples thereof include tetramine such as tri (dimethylaminomethyl) phenol.

The blending amount of the above-mentioned polyol compound and polyamine compound is
1 to 1000 parts by weight, preferably 3 to 200 parts by weight of the polyol compound or the polyamine compound is suitable for 100 parts by weight of the hydroxyl group-containing liquid diene polymer.

In addition, mica, graphite, hirucite, calcium carbonate, slate powder, etc. are added as fillers, plasticizers such as dioctyl phthalate are added as viscosity modifiers, and softeners such as aroma-type, naphthene-type and paraffin-type oils are added. Add or add tackifying resin such as alkylphenol resin, terpene resin, terpene phenol resin, xylene formaldehyde resin, rosin, hydrogenated rosin, coumarone resin, aliphatic and aromatic petroleum resin to adjust adhesion and adhesion. You can also Further, a curing accelerator such as dibutyltin dilaurate, stannous octoate, or polyethylenediamine may be added. Furthermore, an anti-aging agent may be added to improve weather resistance, and a silicon compound or the like may be added as an antifoaming agent.

The building finish of the present invention is produced by mixing and kneading the above raw materials. Usually, first, a predetermined amount of raw materials other than the polyisocyanate compound is mixed and kneaded. The kneading conditions may be determined depending on the types of raw materials and the mixing ratio, but are usually 5 to 120 ° C, preferably 15 to 100 ° C and 2 to 240 ° C.
Minutes, preferably 5 to 180 minutes. The polyisocyanate compound is then added to this formulation,
The building finish of the present invention is obtained by stirring at 0.5 ° C, preferably 15 to 80 ° C for 0.5 seconds to 10 minutes, preferably 1 second to 5 minutes.

Alternatively, a raw material other than the polyisocyanate compound and the cement mixture is blended in a predetermined amount, and stirred and mixed at 5 to 120 ° C., preferably 15 to 100 ° C. for 30 to 240 minutes, preferably 60 to 180 minutes, and then mixed. A polyisocyanate compound is added, and the mixture obtained by stirring and mixing at 5 to 120 ° C., preferably 15 to 80 ° C. for 0.5 seconds to 240 minutes, preferably 1 second to 180 minutes is added to a predetermined amount of cement mixture to prepare a mixture. It is also possible to produce the inventive building finish.

The structure finishing agent of the present invention thus obtained is a liquid composition, and is cured by an appropriate curing treatment as described below to be a cured product.

The conditions for the curing treatment vary depending on the type of raw material and the amount used, but are usually 0.5 to 168 hours, preferably 1 to 72 hours at a temperature of 0 to 150 ° C, preferably 15 to 120 ° C.

The thickness of the finishing agent formed by applying or spraying the building finishing agent of the present invention varies depending on the type of the building to which it is applied, but is usually 1 to 100 mm, preferably about 2 to 50 mm.

[Advantage of the Invention] According to the building finish of the present invention, since shrinkage of the finishing agent during curing is extremely small, a cured product of the finishing agent is free from cracks and has a beautiful finish. The cured product is also excellent in strength.

Therefore, the building finish of the present invention is a mortar building,
It is useful as a finishing agent for structures such as mortar structures, concrete structures, and concrete structures.

[Examples] Next, the present invention will be described in detail with reference to Examples.

Examples 1 and 2 Cement, sand and water shown in Table 1 were mixed with stirring at 25 ° C. for 5 minutes to prepare a mortar, and the hydroxyl group-containing liquid diene polymer and plasticizer shown in Table 1 were added to the mortar. Then, a defoaming agent was added, and the mixture was stirred and mixed at 25 ° C. for 5 minutes, then a polyisocyanate compound was added, and the mixture was stirred and mixed at 25 ° C. for 2 minutes to prepare a liquid composition.

This liquid composition was poured into a mold of 40 × 40 × 160 mm and cured under the conditions shown in the first vote to obtain a cured product. The cured product was evaluated for shrinkage, presence of cracks, compressive strength and bending strength. The results are shown in Table 1.

On the other hand, when the above liquid composition was applied as a finishing agent for a concrete structure so as to have a thickness of 10 mm and cured,
No crack was observed.

Example 3 The components shown in Table 1 except for the polyisocyanate compound and the mortar were stirred and mixed at 80 ° C. for 3 hours, the polyisocyanate compound was added to this mixture, and the mixture was added at 20 ° C. for 2 hours.
Mix with stirring. Next, this mixture was added to a mortar prepared in the same manner as in Example 1 and stirred and mixed at 25 ° C. for 2 minutes to prepare a liquid composition.

The liquid composition was poured into a mold of 40 × 40 × 160 mm and cured under the conditions shown in Table 1 to obtain a cured product. The cured product was evaluated for shrinkage, presence of cracks, compressive strength and bending strength. The results are shown in Table 1.

On the other hand, when the above liquid composition was used as a finishing agent for a concrete structure in the same manner as in Example 1, no crack was observed.

Comparative Example To a mortar prepared in the same manner as in Example 1, components other than the polyisocyanate compound shown in Table 1 were added, and the temperature was adjusted to 25 ° C.
The mixture was stirred and mixed at 5 minutes, then the polyisocyanate compound was added, and the mixture was stirred and mixed at 25 ° C. for 2 minutes to prepare a liquid composition.

This composition was poured into a mold of 40 × 40 × 160 mm and cured under the conditions shown in Table 1 to obtain a cured product. The cured product was evaluated for shrinkage, presence of cracks, compressive strength and bending strength. The results are shown in Table 1.

On the other hand, when the above composition was used as a finishing agent for a concrete structure in the same manner as in Example 1, many cracks were formed.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical indication C09D 5/00 PPA 6904-4J 109/00 NFY 8218-4J 175/04 PHU 8620-4J PHW 8620- 4J

Claims (3)

[Claims] 1. A construction finishing agent comprising a cement mixture, a hydroxyl group-containing liquid diene polymer and a polyisocyanate compound. 2. The finishing agent according to claim 1, wherein the cement mixture is cement paste or mortar. 3. The finishing agent according to claim 1, wherein the sum of the compounding amounts of the hydroxyl group-containing liquid diene polymer and the polyisocyanate compound relative to 100 parts by weight of the cement mixture is 3 to 500 parts by weight.