JPS6218509B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to resin concrete whose main components are polyurethane resin and aggregate. Conventionally, mortar or concrete using inorganic cement has drawbacks such as insufficient mechanical strength, acid resistance, and waterproofing properties. To overcome these drawbacks, resin concrete, which is made of aggregate and synthetic resins such as unsaturated polyester resins and epoxy resins, has been used in various fields as it has excellent mechanical strength and chemical properties. However, polyester resins have drawbacks such as curing shrinkage of the resin, generation of cracks due to heat generation, and poor alkali resistance. Epoxy resins have excellent mechanical strength and chemical resistance, but have the major drawbacks of poor impact resistance and low-temperature curing properties, as well as being expensive. On the other hand, resin concrete using polyurethane resin has excellent mechanical strength and impact resistance, but foaming occurs due to moisture in the aggregate or in the air, and it is not only difficult to manage the aggregate, but also difficult to obtain. The disadvantage is that the performance of resin concrete is not sufficient and lacks uniformity. For these reasons, despite having excellent properties, there are significant limitations in its use, and it has not been possible to use it particularly in thick molded products or applications requiring waterproofness. The inventors of the present invention have conducted extensive research in order to eliminate the essential drawback of foaming of resin concrete containing polyurethane resin, and have found that by selecting a specific composition, excellent resin concrete that does not cause foaming can be achieved. Find out what you can get,
The present invention has now been completed. That is, the present invention relates to resin concrete consisting of (A) a polyisocyanate compound, (B) an active hydrogen group-containing compound, and (C) an aggregate whose particle surfaces are moistened with water and whose surfaces are coated with inorganic powder. be. The resin concrete according to the present invention is characterized in that specially treated aggregate is mixed with a liquid resin consisting of a polyisocyanate compound and an active hydrogen group-containing compound. The present invention will be specifically explained below. Examples of the polyisocyanate compound in the present invention include tolylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, polymethylene polyphenyl isocyanate, xylylene diisocyanate, cyclohexanephenylene diisocyanate, chlorophenylene diisocyanate, and naphthalene diisocyanate.
1,5-diisocyanate, xylylene-2.
2'-diisocyanate, isopropylbenzene-
Examples include an addition reaction product of 2,4-diisocyanate, polypropylene glycol or triol and tolylene diisocyanate, and an addition reaction product of 1 mol of trimethylolpropane and 3 mol of tolylene diisocyanate. Next, as active hydrogen group-containing compounds, ethylene glycol, propylene glycol, 1.4-
Low molecular weight polyols such as butanediol, glycerin, trimethylolpropane, 1,2,6-hexanetriol, pentaerythritol, ethylenediamine, 4,4'-methylene-bis-2-chloroaniline, 4,4'-methylene-bis - Polyether polyols such as propylene oxide adducts of bisphenol A obtained by addition polymerizing alkylene oxides such as ethylene oxide and propylene oxide to amine compounds such as -2-ethylaniline, or low-molecular polyols or amine compounds. . Furthermore, polyhydric alcohols such as ethylene glycol, propylene glycol, 1,4-butanediol and phthalic acid,
maleic acid, malonic acid, succinic acid, adipic acid,
Examples include polyester polyols that are condensation polymers with polybasic acids such as terephthalic acid and have hydroxyl groups at the ends, acrylic polyols, castor oil, tall oil, and the like. There are also liquid rubbers having active hydrogen groups such as hydroxyl groups, amino groups, imino groups, carboxyl groups, and mercapto groups at the molecular ends. This liquid rubber has a number average molecular weight of 500.
~10,000 butadiene homopolymer, butadiene-isoprene copolymer, butadiene-acrylonitrile copolymer, butadiene-styrene copolymer, isoprene homopolymer, and the like. These various polyisocyanate compounds and active hydrogen group-containing compounds can be used not only as individual compounds in combination, but also as a mixture of multiple compounds, taking into consideration the performance, purpose of use, workability, etc. of resin concrete. You can also do it. The blending ratio of the polyisocyanate compound and the active hydrogen group-containing compound is preferably in the range of 0.7 to 1.3 in terms of equivalent ratio of NCO group to active hydrogen (NCO group/active hydrogen).
Particularly preferred is 1.0 to 1.1. In the present invention, a plasticizer, process oil, organic solvent, etc. can be used in the liquid resin in order to reduce the viscosity of the composition. Plasticizers include dioctyl phthalate, dibutyl phthalate,
Examples include dihexyl phthalate, process oils include aromatic, naphthenic, and paraffinic oils with low viscosity, and organic solvents include industrial gasoline, kerosene, toluene, and benzene. Further, if necessary, an unsaturated group-containing polymerizable monomer may be added together with a polymerization reaction initiator for the purpose of reducing the viscosity and further improving the performance of the resulting resin concrete. As the polymerizable monomer, styrene, vinyl acetate, vinyl chloride, acrylic acid, etc. may be used alone or in a mixture thereof. As the polymerization initiator, peroxides such as benzoyl peroxide, methyl ethyl ketone peroxide, and kyumene hydroperoxide are selected in consideration of the reactivity of the polymerizable monomer, curing conditions, and the like. Further, a common urethane curing catalyst may be used in these liquid resin compositions if necessary. These catalysts include stannous chloride, di-n-dibutyltin dilaurate, dibutyltin diacetate, dibutyltin sulfide, ferric chloride, iron acetylacetonate, cobalt naphthenate, bismuth nitrate, lead oleate, antimony trichloride, etc. Examples include metal compounds such as triethylamine, tetramethylbutanediamine, and the like. In the case of the resin concrete of the present invention, after the above-mentioned liquid resin composition is uniformly mixed, aggregate prepared separately from this is uniformly mixed. A feature of the present invention is that the surface of the aggregate is moistened with water and further coated with inorganic powder. The aggregates used here include various types of sand such as silica sand (for example, No. 3, No. 4, and No. 7), river sand, and crushed stone (2 to 5 mm), which may be used alone or mixed with various types of sand. things are used. The mixing ratio of these aggregates and the liquid resin composition is arbitrarily determined depending on the use, moldability, workability, etc., but is usually 10:1 to 1:1, preferably 8:1.
It is in the range of 1 to 3:1. Next, processing of the aggregate used in the present invention will be explained. First, the surface of the aggregate needs to be wet with water. There is no particular limit to the amount of water in the aggregate, but it is sufficient to maintain a moist state, and it is preferable that there is no excess water. Ordinary air-dried sand is treated with less than 10% water, preferably less than 6% water. The amount of water may be appropriately determined depending on the particle size, shape, etc. of the aggregate. Furthermore, it is of course possible to use aggregate that is already in a wet state without performing a process of adding water again. The wet aggregate is then mixed with inorganic powders such as calcium carbonate, talc, clay, calcium hydroxide, magnesium hydroxide, etc. As a result, these inorganic powders coat the surface of the aggregate. The amount of inorganic powder used here is 5 to 30% by weight of the aggregate.
Preferably, about 8 to 20% by weight is sufficient. In the present invention, processing of this aggregate is essential for achieving the purpose of the present invention. Polyurethane resin concrete causes foaming due to water in the aggregate, which has been a major limitation in use, but the present invention prevents foaming by moistening the surface of the aggregate with water, which is thought to be the main cause of foaming. The fact that we were able to obtain this unique effect was completely unexpected. In addition to the above-mentioned compounds, the resin concrete of the present invention further includes conventional fillers such as calcium carbonate, talc, clay, calcium oxide,
Calcium hydroxide, magnesium oxide, magnesium hydroxide, calcium sulfate, asbestos, glass fiber, synthetic fiber, metal fibrous material, pulp, etc. may be added alone or in the form of a mixture if necessary. The aggregate-containing liquid resin composition of the present invention has a temperature of 20% at room temperature.
It has a pot life of ~60 minutes, completes curing in 3 to 4 hours, and eliminates the biggest drawback of ordinary urethane resin concrete, which is foaming.
Forms uniform resin concrete without foaming. The resulting resin concrete not only does not foam, but also has excellent impact resistance, chemical resistance, and waterproofness.
General flooring materials, flooring materials that require chemical resistance, foundations of machinery such as chemical factory pumps, compaction rollers,
Shapes and other places that require waterproofing, corrosion protection, etc.
For example, it can be effectively used in a wide range of civil engineering and architectural fields, such as joint materials for roads and bridges. This will be explained in detail below using examples. Examples 1 to 3 Resin concrete compound compositions were prepared according to the following formulations and filled into molds of 50 mm x 25 mm x 50 mm (height). The degree of blistering caused by foaming on the open surface of the mold at the end of curing of this resin concrete was measured. The results are shown in Table 1.

[Table] Comparative Examples 1 to 4: Untreated aggregate, added inorganic powder without wet treatment, or using ethyl acetate instead of water as wet treatment liquid Except for the above, the procedure was the same as in the example. The results are shown in Table 1.

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Claims (1)

[Claims] 1. Resin concrete consisting of (A) a polyisocyanate compound, (B) an active hydrogen group-containing compound, and (C) aggregate whose particle surfaces are moistened with water and coated with inorganic powder.