JPS60186484A - Lightweight porous mortar or concrete using specific styrenebutadiene emulsion - 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] [Background of the Invention] Regarding the production of lightweight and multicellular mortar and concrete,
In particular, the application of polymer emulsions has been studied in recent years.
For example, published patent publication 53-84024.53-8402
5.53-94328 etc.

The present invention is based on unique knowledge about polymer emulsions, and while it is easy to put into practical use, it has a high butadiene content (2) compared to styrene content, which has not been recognized as having any practical effect in conventional cement formulations. The SBR emulsion is unique in that it uses oleic acid soap, which is considered unsuitable for this purpose, as the main emulsifier.

It is known to add an anionic or nonionic surfactant or a liquid containing fine particles as a means to make mortars and concrete IJ-types more foamy and lightweight. It is natural that it will be applied. The present invention discloses that significant effects can be achieved by using a cationic rubber emulsion with specific composition and physical properties.

This cationic rubber emulsion is as follows: 17
can be obtained. The starting material is a special anionic EIBR latex (emulsion) used in the production of foam rubber for cushions, and these emulsions have a volumetric filling effect as much as possible in order to constitute an excellent cushioning material17. In order to increase the diameter of the polymer particles,
5~o, o1 micron etc. are mixed, and
In order to omit the regular vulcanization process, the molecular weight of the polymer is increased to more than 100% (ML value 130 to 160) and the strength of the rubber film is increased. Commercially available products include J8RO5
61, FR8240, Polysurf 25 and many others. In order to cationize these emulsions, a cationic surfactant having a structure such as an ethylene oxide condensate of an alkylamine and which can be temporarily and stably mixed is added, and then hydrochloric acid or other dilute acid is added to adjust the pH. is cationized by keeping it below 7.5. It has been found that the decomposed oleic acid decomposes into the emulsion in colloidal form and helps stabilize the emulsion itself and the foam.

If the anionic surfactant of the original SBR emulsion is a soap such as rosin acid or stearic acid, no such effect can be expected at all. However, there is a possibility of success when used together with oleic acid.

The above-mentioned fine particle filling effect will be illustrated.

Normal emulsion particle diameters are made to have as few extreme sizes as possible, but the emulsion for foam rubber mentioned above is a mixture of large and small particles (4). This means that the emulsion contains approximately twice as many balls as the emulsion. Therefore, foamed mortar with polymer fine particles as the core, Conc I
The effect when creating a J-t can be understood.

When using this emulsion to make cement mortar or concrete lightweight and multi-cellular, a variable amount is required depending on the application, but if a large amount of this emulsion is mixed into cement mortar, etc., the physical properties of the hardened product will be weakened. On the other hand, it also strengthens sound insulation and heat insulation properties. In such cases, it is particularly effective to combine this with fibers such as glass or steel, which have good adhesive properties.

On the other hand, when based on the physical properties of mortar and concrete themselves, it is appropriate that the amount of the emulsion of the present invention mixed is around 10 to 1% rubber solids relative to cement.

■By mixing the cationic SBR emulsion of the present invention with cationic polymer emulsions suitable for mixing with cement, etc. (5), various physical properties of lightweight, multicellular cement mortar and concrete are improved. As mentioned above, it is possible to save costs and improve construction workability.

a) Styrene-butadiene emulsion Patent No. 949344 by the present inventor (latex for cement compounding)
The other nine items are all cationically modified anionic medium styrene-butadiene (S:B ratio is around 50:50, emulsifier mainly contains sulfone group, etc.), and are used in mortar, concrete, etc. It has already been put into practical use in large quantities, and it can be said that there are no complaints at all regarding general use.

However, although it is known that it has various characteristics such as a certain degree of cellularity, lightness, sound insulation, and heat insulation, there has been a strong desire to further expand these characteristics. However, we have learned that commonly known surfactants and dispersed fine particles have little or no effect.

In contrast to the above cationic SB emulsion, the 8B of the present invention
R emulsion can be stably mixed with (6) in any proportion, making it possible to create mortar and concrete that have the characteristics of both and compensate for their shortcomings.

b) Cationic chloroprene latex As a rubber emulsion with many characteristics, it has been put to practical use for mixing with cement for a long time, but there are problems with storage safety and workability. It has been pointed out that adhesive strength and flame resistance are inferior. Cement mortar and concrete are made by mixing the two in appropriate proportions depending on the purpose. Of course, the main feature of the cured product is that it is lightweight and has many cells.

c) Cationic emulsions of various m-r acrylic and vinyl acetate congeners; various types of emulsions of various acrylics that have recently been given cationic properties for use in cement mixing; Many types of modified vinyl acetate or ethylene vinyl acetate have been developed and commercially available. These are said to have better workability and adhesion than anionic emulsions for use in cement mortar (7).

These derivatives of acrylic and vinyl acetate, which have undergone many improvements, have a basic chemical composition of monovinyl combined with acid groups, so the acrylic and vinyl acetate derivatives are released from irrigation cement.
It would be difficult to break free from the principle of hydrolysis by trivalent alkalis.

In contrast to these cationic emulsions of monovinyl polymers, the SBR emulsions of the present invention are very well miscible in any proportion. The emulsion has a symmetrical divinyl structure, which is copolymerized with monovinyl having a benzene nucleus instead of an acid group in the middle, and has a strong long-chain structure, making it more resistant to various alkalis released during cement irrigation. Not only can it be understood that it has strong resistance, but
It has already been proven that polymer cement between nuclear power plants tends to increase in strength even after 2007 under severe conditions.

By mixing the SBR emulsion of the present invention with the above-mentioned monovinyl type polymer emulsion (8), the resistance to cement and other highly influential substances is enhanced, and by introducing microbubbles, It can contribute to the heat and sound insulation properties of polymer cement mortar and concrete as well as cost reduction.

〔Example〕

■Manufacture of cationic 5EAR emulsion JSRO56
1 latex (solid content 69%, ML16[), surfactant oleic acid strength IJ) to 100 parts, ethylene oxide of alkylamine (NOF Nimeen DT)
After mixing 5 parts, dilute hydrochloric acid is added to lower the pH to around 5. The PR of the raw latex is about 10, and by adding dilute acid, the viscosity draws a unique curve and peaks around PH8.
Below neutrality, the viscosity is low and stable, indicating the completion of cationization. This reaction is shown to be reversible by adjusting the pg value.

Anionic raw latex is 1. In addition to TSRO561, there are many other types on the market, and you can select a suitable product (9) from among them.As for the alkylamine/ethylene oxide condensate, you can use analogues with the same function as TSRO561 other than NOF Nimeen. You can also choose from Armor's Esomene and others.

This cationized emulsion is clearly indicated as "cationic" by the Nibuton method or other known qualitative analysis methods.

■Cationic chloroprene latex mixed with various polymer emulsions is available from Denka LK-
50, or use Neoprene ÷950. Although cationic commercially available products are available for various types of acrylic and ethylene vinyl acetate, these monovinyls having acid groups are subjected to primary polymerization by adding a quaternary ammonium salt, etc., as known in the art, during emulsion polymerization. Reactively, cationic emulsions can be obtained.

The above-mentioned cationic emulsions and the 8BR emulsion of the present invention can be mixed in any ratio and are stable even during long-term storage.

(10) ■Compound mortar/conc IJ-) Most of the polymer emulsions for cement compounding that have been successfully developed on the market at present sufficiently satisfy the physical properties required for general use, but the remaining problems are durability and Lightweight, multi-celled, sound insulating and
The focus is on insulation and cost reduction.

It would be too much to enumerate the various physical properties found in hardened polymer cements due to their wide range of applications, so I will simply mention the specific gravity of mortar and concrete. It can be understood that the smaller the specific gravity, the more bubbles there are.

Now, whereas mortar made by a general method (cement/sand ratio 1:3) has a specific gravity of around 2.1, when the cationic SBR emulsion of the present invention is added, the rubber solids Specific gravity 0 in case of 10% (weight ratio)
．． When the rubber content is 5%, the specific gravity is about 1.1, and when the rubber content is 6%, it is about 1.2 and about 1.8.

(11) Cement mortar with other polymer emulsions,
Concrete is approximately 10-15% lighter in specific gravity than it would be without the addition of polymers.

When the SBR of the present invention is mixed with these, although there is a slight increase or decrease, there is generally no major difference from the specific gravity trend described above.

■Mixing particles/fibers other than sand The adhesion of anionic polymer emulsions is weak.Cationic polymer emulsions adhere extremely well to the surfaces of glass, steel, polymer fibers, glass, shirasu, and other abrasive particles. Make the combination of these things effective,
Strengthens the hardened body.

It increases the possibility of application to various structural materials.

Patent applicant: Catex Co., Ltd. (12) Procedural amendment (method) % formula % 1, Indication of case Patent application No. 41840 of 1982 2,
Title of the invention Lightweight, multicellular mortar and concrete using special styrene-butadiene emulsion 6 Relationship with the case of the person making the amendment Patent applicant number 40 Address 4 Date of amendment order May 9, 1980 5 , Subject of amendment Full text of the specification

Claims (1)

[Claims] 1) A polymer copolymer with a styrene:butadiene ratio of 40>:60<, a molecular weight of about 800,000 or more, and an emulsion containing oleate as the main emulsifier, It is characterized by adding an ethylene oxide condensate of alkylamine or amide, then adding dilute acid to lower the pH, decomposing the oleic acid soap, and mixing it into Portland cement, aggregate, etc. A method for producing lightweight, multi-cellular mortar and concrete. 2) The high molecular weight styrene-butadiene emulsion described in the previous section, medium styrene-butadiene with cationic properties (S:B is approximately equal), chloroprene, each type of acrylic, and (1) acetic acid. A lightweight, multi-cellular mortar characterized by blending various emulsions of vinyl congeners according to the application.
Method of manufacturing concrete. 3) The high molecular weight emulsion described in 1) alone, or 2
When mixing the mixed polymer emulsion described in item ) with cement, sand, etc., it is characterized by mixing metals, persole, polymer fibers, or air-containing foam coarse particles thereof, etc.
A method for producing lightweight, multicellular mortar concrete.