JP3435982B2 - Hydraulic material composition and molded product - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a hydraulic material composition intended for mortar, concrete, cement paste and the like and a molded product obtained by curing the composition. More specifically, the present invention relates to a solid hydraulic material composition which has high strength of a molded product and little drying shrinkage.

[0002]

2. Description of the Related Art Composites of resin and cement are used to improve the bending strength and tensile strength of conventional mortar, concrete, etc.
Widely used for the purpose of improving water resistance. Conventionally, in these applications, resins are generally used as water dispersions, but when compounding at work sites such as mortar, powders such as cement and water dispersions of resins are measured separately. There was a demand for powdered resin. After that, by improving the resin, a powder was developed that was easily dispersed when compounding mortar, concrete and the like. Such resins are called re-emulsified powder resins and are used in premix mortar and the like. on the other hand,
The drying shrinkage that occurs with time in mortar, concrete, etc. due to the capillary phenomenon has caused problems such as cracking {Kyoritsu Shuppan, Noriaki Iwasaki, "Characteristics of Concrete," pages 123-156 (1982)}. In order to solve this, a drying shrinkage reducing agent containing a lower alcohol or a polyoxyalkylene compound as a main component has been developed and is used for mortar and concrete {Cement Technical Report, Vol. 37, pp. 65-68 (1983). )}. However, no solid dry shrinkage-reducing agent has been found for mortar and concrete that use a composite of resin and cement, and formulations such as premix mortar with little dry shrinkage have been developed. Not not.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a solid composition containing resin powder and cement, which exhibits high flexural strength and tensile strength when used in mortar, concrete, etc. and which has little drying shrinkage. The purpose is to provide. Further, the object is to provide a molded product obtained by curing the composition.

[0004]

Means for Solving the Problems As a result of intensive studies for solving the above problems, the present inventors have found that a solid hydraulic material containing cement, resin powder and a specific polyoxyalkylene derivative is used. The present invention has been completed based on the finding that mortar, concrete and the like having high bending strength and tensile strength and less drying shrinkage can be provided. That is, the present invention provides (1) (a) cement, (b) powder resin, and (c) the following general formula (1) X {O (AO) nR} m (1) (where X is 2 to 8). A residue of a compound having a hydroxyl group, AO is an oxyalkylene group having 2 to 18 carbon atoms, R is a hydrogen atom or a hydrocarbon group having 1 to 18 carbon atoms or an acyl group having 2 to 18 carbon atoms, and n is 30 to 1000, m is 2
Represents 8. Further, 60 mol% or more of the oxyalkylene group is an oxyethylene group. ), A component (a) :( b) :( c).
Is a hydraulic material composition having a weight ratio of 100: 0.5 to 50: 0.2 to 10. When (2) polymer mortar or polymer concrete is used, (a)
Cement, (b) powder resin, (c) the following general formula (1) X {O (AO) nR} m (1) (where X is a residue of a compound having 2 to 8 hydroxyl groups,
AO is an oxyalkylene group having 2 to 18 carbon atoms, R is a hydrogen atom, a hydrocarbon group having 1 to 18 carbon atoms, or 2 carbon atoms.
~ 18 acyl group, n represents 30 to 1000, m represents 2 to 8. Further, 60 mol% or more of the oxyalkylene group is an oxyethylene group. ), A polyoxyalkylene derivative and (d) sand, and (a) :( b):
The weight ratio of (c) :( d) is 100: 0.5 to 50: 0.
The hydraulic material composition is 2 to 10:50 to 400. Furthermore, (3) a molded product obtained by curing the above hydraulic material composition.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Examples of the cement used in the present invention include ordinary Portland cement, early-strength cement, low exothermic cement and the like, and further, blast furnace slag, fly ash, silica powder, silica fume, limestone. A composition in which powder or the like is mixed can also be used.

As the powder resin of the component (b) used in the present invention, ethylene-vinyl acetate resin, vinyl acetate-vinyl versatate resin, styrene-acrylic ester resin, polyacrylic acid resin, styrene-butadiene rubber,
Examples thereof include chloroprene rubber. Among these, those which are easily dispersed in water, specifically, ethylene-vinyl acetate resin, vinyl acetate-vinyl versatate resin, styrene-acrylic acid ester resin, polyacrylic acid resin and the like are preferable. The amount of the powder resin as the component (b) used in the present invention is 0.5 to 50 weight ratio with respect to 100 of cement. If it is less than 0.5 weight ratio, the bending strength of the molded article becomes insufficient, and if it is more than 50 weight ratio, the strength of the molded article becomes insufficient.

In the general formula (1), X is a hydroxyl group of 2 to
Compounds having 2 to 8 hydroxyl groups, which are residues of a compound having 8 groups, include ethylene glycol, propylene glycol, butylene glycol, hexylene glycol,
Styrene glycol, alkylene glycol having 8 to 18 carbon atoms, glycols such as neopentyl glycol, glycerin, diglycerin, polyglycerin, trimethylolethane, trimethylolpropane, 1,3,5-pentanetriol, erythritol, pentaerythritol, Dipentaerythritol, sorbitol, sorbitan, sorbide, condensates of sorbitol and glycerin, polyhydric alcohols such as adonitol, arabitol, xylitol, and mannitol, or their partial etherified products or esterified products, xylose, arabinose, ribose, rhamnose, and glucose. , Fructose, galactose, mannose, sorbose, cellobiose, maltose, isomaltose, trehalose,
Examples thereof include sugars such as sucrose, raffinose, gentianose, and melezitose, and their partially etherified products or esterified products.

In the general formula (1), the oxyalkylene group having 2 to 18 carbon atoms represented by AO is derived from ethylene oxide, propylene oxide, butylene oxide, tetrahydrofuran, α-olefin oxide having 6 to 18 carbon atoms and the like. , Oxyethylene group, oxypropylene group, oxybutylene group, oxytetramethylene group,
When there is an oxyalkylene group having 6 to 18 carbon atoms and two or more kinds are added, block addition or random addition may be used. In the general formula (1), R is a hydrogen atom, a hydrocarbon group having 1 to 18 carbon atoms, or a carbon number of 2 to 1
8 represents an acyl group.

Examples of the hydrocarbon group having 1 to 18 carbon atoms are methyl group, ethyl group, allyl group, propyl group, isopropyl group, butyl group, isobutyl group, tert-butyl group, amyl group, isoamyl group, hexyl group and heptyl group. Group, octyl group, 2-ethylhexyl group, nonyl group, decyl group, undecyl group, dodecyl group, isotridecyl group, tetradecyl group, hexadecyl group, isocetyl group, octadecyl group, isostearyl group, oleyl group, benzyl group, cresyl group, Examples thereof include a butylphenyl group, a dibutylphenyl group, an octylphenyl group, a nonylphenyl group, a dodecylphenyl group, and a styrenated phenyl group.

As the acyl group having 2 to 18 carbon atoms, acetic acid,
Propionic acid, butyric acid, isobutyric acid, caproic acid, caprylic acid, 2-ethylhexanoic acid, pelargonic acid, capric acid, lauric acid, myristic acid, palmitic acid, isopalmitic acid, margaric acid, stearic acid, isostearic acid, acrylic acid And an acyl group derived from methacrylic acid, palmitoleic acid, oleic acid, linoleic acid, linolenic acid, benzoic acid and the like.

In the general formula (1), the value of n is 30 to 1
It is 000. When n is less than 30, the melting point becomes low,
When it is used in a solid state, it becomes difficult to use it, and when n is larger than 1000, the viscosity becomes high and the production becomes difficult. In the general formula (1), the content of oxyethylene groups in the oxyalkylene groups is limited to 60 mol% or more. If the oxyalkylene group content is less than 60 mol%, the melting point will be low and it will be difficult to use it in the solid state, and the solubility in water will be low. The amount of the polyoxyalkylene derivative represented by the general formula (1) used as the component (c) used in the present invention is 0.2 to 10 weight ratio with respect to 100 of cement. If it is less than 0.2 weight ratio, the drying shrinkage performance is insufficient, and if it is more than 10 weight ratio, the strength of the molded product is insufficient.

The sand of the component (d) used in the present invention is generally used as a fine aggregate in 1 according to JIS A0203.
Passes through all 0mm mesh sieves and is 5mm mesh sieves by mass
It is an aggregate that passes 5% or more. Specific examples of such sand include river sand, land sand, mountain sand, sea sand, crushed sand, and lightweight aggregate. The amount of sand of component (d) used in the present invention is 50 to 400 weight ratio with respect to 100 of cement. If the amount is less than 50% by weight, the meaning of adding sand to make it economically inexpensive is diminished, and if the amount is more than 400% by weight, the strength of the molded article becomes insufficient.

The hydraulic material composition of the present invention can be used by adding water, gravel, and further additives, if necessary, and mixing them, and hardening them as polymer mortar or polymer concrete.

The hydraulic material composition of the present invention comprises a water reducing agent, a defoaming agent, an AE agent, an anticorrosive agent, an antifreezing agent, a coloring agent, a swelling agent,
It can be used in combination with additives such as setting accelerators, setting retarders and thickeners. The hydraulic material composition of the present invention is in a solid state and can be used as a premix type for mortar, cement slurry, concrete and the like. Alternatively, cement, powder resin, and the polyoxyalkylene derivative represented by the general formula (1) may be individually blended to prepare mortar, cement slurry, concrete and the like.

[0015]

EFFECTS OF THE INVENTION The hydraulic material composition of the present invention is in a solid state, and when used in mortar, cement slurry, concrete, etc., it has high bending strength and compressive strength, and exhibits characteristics of little drying shrinkage. it can.

[0016]

EXAMPLES The present invention will be described in more detail with reference to the following examples. Next, the materials used in Examples and Comparative Examples are shown. Materials used: Cement: Ordinary Portland cement Powder resin: Re-emulsified powder resin (white powder of ethylene vinyl acetate, Tg = 0 ° C., average particle size 60 μm) Polyoxyalkylene derivative: shown in Table 1. Sand: Toyoura standard sand defoamer: Polyester powder defoamer

Example 1 (a) 100 parts by weight of cement, (b) 5 parts by weight of powder resin, (c) No. 1 of the general formula (1) shown in Table 1. 2 parts by weight of the polyoxyalkylene derivative of 1 (d) 300 parts by weight of sand and 0.05 parts by weight of a defoaming agent were used, and JIS A117 was used.
1 (1978) to make a polymer cement.

[0018]

[Table 1]

[0019]

[Table 2]

[0020]

[Table 3]

Examples 2 to 25, Comparative Examples 1 to 16 In the same manner as in Example 1 below, the component (b) in Tables 2 and 3 was used.
Polymer mortar cements were prepared by changing the addition amount of the powder resin of 1., the type and addition amount of the polyoxyalkylene derivative of the component (c). The conditions for preparing the polymer mortar cement were as follows, and each performance test was conducted. The flow rate of mortar is 170 ± 5m.
It was adjusted to be m. The molding conditions and test methods are shown below. Curing condition and measuring method; Polymer cement mortar; JIS A 1171 (1
978). Molding size; size 40 × 40 × 160 mm. Curing condition after molding; 1) 2 days wet air (20 ° C, 80%)
R. H. ). 2) Curing in water (20 ° C) for 5 days. Drying condition; Drying (20 ° C., 50% RH) Curing drying shrinkage measuring method; JIS A 1129 (1993)
Year). Immediately after curing the specimen in water (20 ° C.), the base length of the specimen was measured, and further, the base length of the dried specimen was measured and compared. Method for measuring compressive strength and bending strength; JIS A 1172
According to (1995), the flexural strength and compressive strength tests of the specimens having a dry material age of 28 days were conducted. The results are shown in Tables 2 and 3. As a result of the above,
It can be seen that the hydraulic composition of the present invention has less drying shrinkage after curing, and has higher flexural strength and compressive strength as compared with the comparative example in which the powder resin is not added.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI C04B 14:06) C04B 103: 50 103: 50 111: 34 111: 34 111: 50 111: 50 (58) Fields investigated (Int .Cl. ⁷ , DB name) C04B 28/02 C04B 24/32 C04B 16/04

Claims (3)

(57) [Claims] 1. (a) Cement, (b) powder resin and (c) the following general formula (1) X {O (AO) nR} m (1) (where X has 2 to 8 hydroxyl groups). Compound residue, AO is an oxyalkylene group having 2 to 18 carbon atoms, R is a hydrogen atom, a hydrocarbon group having 1 to 18 carbon atoms or an acyl group having 2 to 18 carbon atoms, n is 30 to 1,000, and m is 2 ~
Represents 8. Further, 60 mol% or more of the oxyalkylene group is an oxyethylene group. ), A component (a) :( b) :( c).
The hydraulic material composition having a weight ratio of 100: 0.5 to 50: 0.2 to 10. 2. When used for polymer mortar and polymer concrete, (a) cement, (b) powder resin, (c) the following general formula (1) X {O (AO) nR} m (1) (however, X is a residue of a compound having 2 to 8 hydroxyl groups, AO is an oxyalkylene group having 2 to 18 carbon atoms, R is a hydrogen atom, a hydrocarbon group having 1 to 18 carbon atoms, or an acyl group having 2 to 18 carbon atoms. , N is 30 to 1000, m is 2
Represents 8. Further, 60 mol% or more of the oxyalkylene group is an oxyethylene group. ), A polyoxyalkylene derivative and (d) sand, and (a):
The weight ratio of (b) :( c) :( d) is 100: 0.5-5.
A hydraulic material composition of 0: 0.2 to 10:50 to 400. 3. A molded product obtained by curing the hydraulic material composition according to claim 1 or 2.