JPS6096559A - Hydraulic composition deformable after curing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The object of the present invention is to provide a water-curable hydraulic material that has deformability even after curing.

Numerous studies have been conducted in which attempts have been made to improve cement concrete by mixing polymers into Hymento's white hydraulic material.

For example, efforts are being made to impart deformability (rubber elasticity) to cement mortar by mixing latex into Portland cement, mixing fine solid rubber particles into cement, or a combination of the two. Both have their problems.

That is, in order to impart rubber elasticity, it is necessary to add a large amount of fine rubber particles or latex, and in such a case, the physical properties as a cement mortar will be significantly reduced.

For example, in JP-A-50-86826, 50 to 150 parts by weight of natural and/or synthetic rubber fine particles are used as the seventh layer,
A mortar consisting of 2 to 50 parts by weight of Synthetic 1 liquor based emulsion and 100 parts by weight of cement is disclosed, but such mortar is confirmed when a golf ball is dropped. Although the cushioning effect may be satisfactory, the rubber content is too large and the physical properties (flexural strength, compressive strength, etc.) of mortar cannot be expected.

Similarly, in JP-A-50-108345, a cement-based sealant with a rubber-to-cement ratio of 95 to 550% was proposed, but since the rubber latex content is very high, bone A large amount of material must be added, and although it is satisfactory in terms of elasticity and waterproofness as a sealing material, the strength and physical properties of 7-ring and 1-rings are significantly reduced.

On the other hand, Japanese Patent Publication No. 40-28194 has a great effect on improving the physical properties of mortar, and is now widely put into practical use. However, the deformability of mortar is still not sufficient.

This is because if you want to lower the elastic modulus of mortar and give it deformability, you have to use a large amount of latex like the mortar described in JP-A-50-108345 r1L2, and if you do that, the mortar physical properties This is due to contradictory factors that lead to a decline in

As described above, in cement-based mortar V, which is a hydraulic material, it is extremely difficult to maintain the original physical properties of the mortar to some extent while at the same time imparting deformability.

As a result of intensive research in order to solve these problems, the present inventors found that by using latex and plasticizer together, a material with a low elastic modulus (1,6 5%) can be obtained, and based on this finding, the present invention was completed.

That is, the present invention provides 100 parts by weight of a hydraulic substance, 100 parts by weight of at least one polymer selected from the group consisting of synthetic rubber latex, natural rubber latex, and synthetic resin emulsion.
~50 parts by weight (surface shape fraction X) and 10 to 60 parts of plasticizer
This is a hydraulic composition that has deformability even after curing, and is characterized by containing part by weight as a main component.

In the present invention, hydraulic substances include portland cement (ordinary portland cement, early strength portland cement, ultra early strength portland cement, moderate heat portland cement, sulfate resistant portland cement, white portland cement, oilwell cement, masonry cement, etc.) ), alumina cement, rapidly hardening high-strength cement, expansive cement, acid phosphate cement, self-hardening cement such as calcined slag cement, latent hydraulic cement such as lime slag cement, blast furnace cement, high sulfate slag cement, Keens cement, etc. , mixed cement 1 (i-) such as lime-silicate mixed cement.

Further, the polymer to which the present invention is applied is at least one selected from the group consisting of synthetic rubber latex, natural rubber latex, and synthetic rubber emulsion, as described above.As the synthetic rubber latex, chloroprene rubber latex ( C), styrene-butadiene rubber latex (S
Synthetic resin emulsions include polyacrylate emulsion (styrene (!: (7) Examples include copolymerization (including copolymerization), polyvinyl acetate emulsion, polyvinyritine chloride emulsion, and ethylene-vinyl acetate copolymer emulsion.

The amount of such polymer used is about 10 to 50 parts by weight, preferably 10 to 30 parts by weight as a solid content, based on 100 parts by weight of the hydraulic material. If the amount of polymer used is less than about 10 parts by weight, the cured composition will have poor deformability and the elastic modulus will not reach about 1.6%, while if it exceeds about 50 parts by weight, the cured composition will be deformed. Although the elasticity is large, the elastic modulus is about 5.
%, the physical properties of the mortar deteriorate, both of which are unfavorable. Note that these latexes and emulsions have problems with mixing stability when mixed with cement or other hydraulic substances, so if necessary, stabilizers such as polyoxyethylene alkylphenyl ether or Noricone emulsions may be used. It is preferable to add an antifoaming agent and a phenolic anti-aging agent.

Furthermore, as plasticizers, diptyl fuculate, di-n-octyl phthalate, di(2-ethylhexyl) phthalate,
Dinonyl phthalate, dilauryl phthalate, butyl lauryl phthalate, butyl benzyl phthalate, di(adipate)
In addition to general plasticizers for plastics and synthetic rubber, such as Sebacin R di(2-ethylhexyl), tricresyl phosphate, tri(2-ethylhexyl) phosphate, polyethylene glycol ester, and epoxy fatty acid ester, pine Tar, tall oil, chlorinated paraffin.

Rubber softeners such as naphthenic mineral oils can be mentioned. Thus, the amount of aJ plasticizer used is about 15 to 60 parts by weight based on the hydraulic material.

If the amount of the ijJ plasticizer used is less than about 15 parts by weight, the affinity between the polymer and the hydraulic substance will be insufficient, and the resulting cured composition will also have poor deformability and an elastic modulus of about 1. On the other hand, if it exceeds about 60 parts by weight, the curing speed of the hydraulic material becomes slow and the physical properties of the mortar of the resulting cured composition deteriorate, both of which are undesirable.

The present invention can provide a composition that has deformability after curing and has desired mortar physical properties by combining a hydraulic substance, the above-mentioned polymer, and a plasticizer in specific amounts. The hydraulic composition of the present invention is prepared by mixing and stirring specified amounts of the latex or emulsion or a combination thereof and a plasticizer to form a uniform emulsion (stabilizers, antifoaming agents, and anti-aging agents are added as necessary). ), the polymer/cement ratio is 10 to 50%, and the plasticizer/cement ratio is 15 to 6.
It can be manufactured by mixing a hydraulic substance (in some cases with a hardening accelerator such as calcium chloride) so that the hardening agent is 0%, and further mixing an appropriate amount of sand, gravel, stone powder, etc. as necessary.

The hydraulic composition (cement mortar) obtained by smelting has an elastic modulus in the range of 1.6 to 5%, can withstand expansion and contraction of 1 to 2%, and has desired mortar physical properties. . This kind of thing is completely unthinkable with normal mortar.

The uses of the hydraulic composition obtained by the present invention include:
Joint material to fill in the joints of PC boards, caulking to fill between walls and pipes, cushioning flooring materials, excavation prevention materials for machine foundations, cushioning materials, playgrounds for kindergartens, etc. Suitable for use as elastic paving materials and str floor base materials used for floors in condominiums, hotels, etc.

EXAMPLES The present invention will be explained in more detail below with reference to Examples.

Example 1 Styrene-butadiene rubber latex (hereinafter referred to as “S B
45% bound styrene) 20
15 parts of naphthenic process oil for rubber and 15 parts of dibutyl phthalate as ijJ plasticizers were added to the solid content, and 6 parts of polyoxyethylene nonylphenol ether was added as a stabilizer.
A homogeneous emulsion was obtained by thorough stirring.

Ordinary Portland cement (hereinafter referred to as cement) 10
100 parts of the above emulsion was added to 0 parts and thoroughly kneaded.

After 28 days of curing, the surface hardness of the cement composition obtained by smelling was measured using a rubber hardness meter according to JIS /:, (,3C)I, and it was found to be 94. The tensile performance as a sealing material was determined based on the test method for ``Sealing materials for construction'' (same below)
The maximum strength measured is 0,9 ECplcr!
, the maximum elongation was 105%.

Example 2 To 10 parts of SDR latex (60% amount of bound styrene),
10 parts of acrylic resin emulsion, 30 parts of chlorinated paraffin as a plasticizer, 25 parts of water, and 10 parts of polyoxyethylene nonylphenol as a stabilizer were added and thoroughly stirred to obtain a uniform emulsion.

100 parts of the above emulsion was added to 100 parts of cement and thoroughly mixed and stirred.

The thus obtained cement composition was rated according to JISA5757r.
The tensile performance as a sealing material was measured according to the test method for "Architectural sealing materials", and the maximum strength was 1, I.
KtAtll, the maximum elongation was 103%, and the surface hardness measured by a crushed rubber hardness meter was 62.

Example 6 10 parts of natural rubber latex, 5 parts of naphthenic mineral oil and 15 parts of dioctyl phthalate as plasticizers, and 55 parts of water.
part, and 1 part of potassium oleate soap as a stabilizer and polyoxyethylene nonylphenol-' f k
All 5 parts were added and thoroughly stirred to obtain a homogeneous emulsion.

100 parts of the above emulsion was added to 100 parts of cement and thoroughly mixed and stirred.

After 28 days of curing of the cement composition thus obtained, the surface hardness was measured using rubber hardness A1 and it was 98, and the tensile properties were as follows: maximum strength of 1.3 Kp/crA
, the maximum elongation was 105%.

Comparative Example 1 To 20 parts of the SBR latex used in Example 1, only 5 parts of polyoxyethylene nonyl 7-ether was added as a stabilizer to obtain a uniform emulsion. To 100 parts of O cement, 100 parts of the above emulsion was added. Mix and stir thoroughly.

After 28 days of curing, the surface hardness of the thus obtained cement composition was measured using a rubber hardness meter and found to be 100.
The scale exceeded the above and it was impossible to measure.

In addition, the maximum strength of tensile strength is 10.3 Kt/ai
-The maximum elongation was 100.1% or less.

Comparative Example 2 300 parts of the SDR latex emulsion prepared in Comparative Example 1 was added to 100 parts of cement, and 750 parts of No. 7 silica sand were added and thoroughly kneaded.

After curing the thus obtained cement composition for 28 days, the surface hardness was measured using a rubber hardness meter and it was over 100, and the tensile strength was 12.6 S/cnl at the maximum.
, the maximum elongation was 100.1% or less.

Examples 4-6. Comparative Examples 6 to 6 Experiments were conducted in the same manner as in Example 1, except that the amount of SDR latex added and the amount of iiJ plasticizer added (naphthenic gross oil for rubber and dibutyl phthalate were equal amounts). , S B 14 for cement compositions
The effects of latex and plasticizer were investigated. The results are shown in Table 1.

Claims (1)

[Claims] 1. 100 parts by weight of a hydraulic substance, 10 to 50 parts by weight of at least one polymer selected from the group consisting of synthetic rubber latex, natural rubber latex, and synthetic resin emulsion, and 15 to 60 parts by weight of a plasticizer. A hydraulic composition having deformability even after curing, which is characterized by containing as a main component.