JPS62502041A - Use of latex with alumina cement and gypsum compositions - 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] Use of latex and luminescent cement, 1: and gypsum compositions field of invention The present invention is a wet l! With or without the addition of tension and drying shrinkage inhibitors, special in latex emulsion or other compounds to form alumina cement/ The present invention relates to methods and compositions for improving the performance of gypsum compositions.

definition The term “hydraulic cement” used here ) are Boatland cement, expanded seven-ment, air-entrained Portland cement, boatland cement, Lazon cement (pozzolanie ceIIent), slag cement Brick cement, white cement.

11 color cement, antibacterial cement (antibaeteriml CEO+ent ), w4 water cement t portland cement not intended to mean cement, alumina cement and similar raw materials. Intended to contain gypsum, calcium sulfate (CaSOF) and no Calcium hydroxide sulfate, calcium hemihydrate sulfate, calcium dihydrate sulfate and calcined gypsum (aleined qypsus+), pressure calcined plaster (pressure calcined gypsua+), and plaster of Paris).

The term “cementitious mix” used herein ures)'' means a combination of alumina cement and gypsum in any proportion. intended to. Generally, these compositions have the property of curing with water. Cage, cement-based waterproof material, topping, protective coating. Coverings, concrete, mortar, cement stucco (grout), etc. products made therefrom, including agglomerates and mixtures containing water.

The term “alumina cement” as used herein refers to the main cementitious constituents: Contains 1-calcium aluminate (CaOxAlxOj) Intended to include those cementitious materials commonly known in the art to ing. This is high alumina cement (ealc+u* a1m+n+nate eement), and other commercially available aluminium cements include. High alumina cement usually contains more than 15% calcium monoaluminate. It is technically known that

The term “Portland cement” used here is based on ASTM Standard C Standard 50. It is usually understood to be “Portland cement” as described. It is intended to include cements. Type 1 of this standard and type 3 is particularly suitable for this invention, although other types of Portland cement are also suitable. preferred for use in light. Portland cement of these cementitious mixtures The above components act to reduce drying shrinkage and increase wet swelling. Especially port Although not mentioned as a trad cement, it acts as a drying shrinkage inhibitor. Other cements are also suitable for use herein. Therefore, the term “Portlan Docement 2 should be understood as including these other cements. Dry yield Examples of shrinkage inhibitors include swelling inhibitors such as expansive cements that are compatible with other components of the system. Contains tonicity enhancer.

The term “drying yield w1” as used herein refers to the shrinkage of the cementitious mixture in the hardened state; i.e. 0 used here is intended to mean shrinkage after final solidification. The term “drying shrinkage inhibitor” refers to mechanical restraints, i.e., strengthening mechanisms, or chemical compounds. May contain latex compounds, moisture retention agents, lime, swelling agents, aluminum sulfate materials, 7-ment combinations, fibers, reinforcing agents, or reducing drying shrinkage or It may include, but is not limited to, features that exclude it.

The term "drying shrinkage inhibitor" may also be used herein, Describes the components or materials that cause the expansion.

As used herein, the term "wet swelling" refers to the swelling of a cementitious mixture in the hardened state; i.e. hard cement, mortar and concrete according to A37M standard, C-157. After final solidification of the cement in a wet state, the test method for the change in length of the cement is usually prescribed. is intended to mean the expansion of a tomato mixture.

The terms "wet swelling inhibitor" and "wet swelling inhibiting action" are used herein essentially interchangeably. used interchangeably to destroy wet expansion of cementitious mixtures in the hard state. and/or system placement volume (sy stem placement volume) or greater than this Describe that volume is advantageously maintained. And, it is called “removal of wet swelling”. It also includes other similar terms.

m-word #wet expansion inhibitor”° if certain latex and/or lithium salts, and and other chemical or reinforcement including mechanical, restraint or reinforcement devices that limit wet expansion. Also includes other chemical or physical compounds, including equipment.

The "polymerized latex emulsions and compounds" used here are styrene.

Bukudiene, acrylic/L-styrene, acrylic acid, polyvinyl acetate ( PVA), and other latex emulsions, compounds and powders. is intended.

Background of the invention (hydraulic cement), especially used in portland cement applications. polymerized latte Recent developments in box technology have improved properties such as bond strength, tensile strength and t-flex strength. For use in conjunction with these hydraulic cements only for quality improvement, compatible pots are available. I had prepared a mixture with lime emulsion.

A system that meets the needs of the construction industry, especially concrete protection, water resistance and repair of structures. There have been many prior art attempts to provide ment-quality formulas. The optimal method is A hard mass with sufficient strength, low FJ wear resistance and corrosion resistance, the rod is relatively attached to the coating. It must solidify within a short time. These methods also work with fluids, especially It is highly desirable that the material has permeability to aqueous solutions. Mana, these methods are It must not undergo excessive cure volume changes under either dry or dry conditions.

For economical use, these 7-mention method types can also be used on damp surfaces or Good bonding properties to dry surfaces, as well as long-term strength and field workability. Must be. They are freeze resistant and #4 thaw resistant, as well as salt, solvent and It must be able to resist the action of other corrosive substances. Desirable as stated above Although there have been many cementitious mixtures with one or more of the following properties, the prior art To date, no technique has been able to achieve all of the above with a single composition. However, previous attempts have only met with limited success. U.S. Patent No. 4,357,1 No. 66 discusses some limitations of these prior art in columns 2 and 3, citing Therefore, it is clearly included in this.

In general, mixtures of cementitious mixtures and Portland/gypsum are wetted and bonded. When the capacity is low, the durability, weather resistance, freeze/thaw resistance is low, and the resistance to water and salt is low. Particularly proven to have low resistance to seepage, erosion and long-term stability is well known. In addition, the results of contraction and expansion change, and Portland Cement It can be caused by changes in tricalcium aluminate and other compounds in the compound. difference In addition, volume change adjustment, durability, permanence, high binding, humidity resistance, freeze/thaw Previous attempts to create resistant, crack-free, and sound cementitious mixtures were limited or unsuccessful. Additionally, these Portland/gypsum compositions demonstrated high porosity and high absorption rates with just an equivalent amount of Portland mixture; This not only jeopardizes the material's resistance to corrosive water and salts, but also / The resistance of the material to thawing cycles also makes it dangerous.

Finishing should be done to protect the concrete from the action of salts. The performance of Portland cement plaster as a plastering and resurfacing treatment was also poor. Ta. Gypsum material alone or in combination with Portland cement is water resistant or is not weather resistant or long-term resistant under moisture/dry cycles. It is well known.

Additionally, the product Portland cement varies in both fineness and composition; The tradland/gypsum mixture is characterized by its setting time, moisture requirement and consistency. Significant; variable and therefore variable field operations and mixing requirements and expectations It was found that this yields an early strength that cannot be achieved by

Constant plant preparation is required to provide products with reasonably reliable performance. Variations in formulation and appropriate mixtures are contemplated.

Previous compositions containing alumina cement and other hydraulic cements such as gypsum were It has been shown to exhibit periodic wet expansion. For example, US Patent No. 4,357,1 No. 66 solidifies rapidly when mixed with water and does not undergo substantial shrinkage during solidification. A hard material with a high compressive strength and a high pressure strength without shrinkage. Under cement, which is capable of coagulating into pools and exhibits reduced wet and dry volumes in the cured state A mold composition is disclosed. The invention also provides wear, corrosion and chemical resistance as well as fluid resistance. It is desired that the composition be impermeable and commercially useful in the construction industry. It also has some nice characteristics. The advantage of the invention is that alumina cement, gypsum, dry By a cementitious composition consisting of a mixture of a shrinkage inhibitor and a wet d'5 expansion inhibitor. achieved. The composition of this invention preferably uses Portland sesame as a desiccation inhibitor. i! ! Lithium salt is used as the shield m tension inhibitor.

However, when the composition of alumina cement and gypsum is added, various accelerators , retarders and other mixtures meaningfully affect hard volume changes (wetting or drying) , thus limiting its usefulness.

In addition, traditional attempts to mix gypsum with other hydraulic cements have resulted in rapid setting or water or wet/dry cycles while also achieving desired effects such as reduced shrinkage. The stability of the concrete is moderate to the permanence of glossy cement) Durability and workability It also affects sex and resistance.

portland cement is well known and has been used to improve bond strength, tensile strength, absorption rate, etc.

In addition, latex emulsion compounds have recently been shown to have a high or low customer volume; Expandable cement using 8a mechanical restraint equipment such as reinforcement of restraint elements Discloses that it will be used for However, the stress caused by these Cracks, creases, and unbonds still occur on the glass-like surface. Furthermore, this (, [Carefully set, plan, space, and distribute; 7. (see, e.g., U.S. Pat. No. 4,039,'345) . In addition, the formulation of expanding cement using latex is latex emulsion. And the compound comes.

Polymerized latex emulsion to increase its tensile strength and water penetration resistance ,baud!・Can be used with land cement mortar. However, people The addition of x emulsion 9 to the HAC/gypsum composition inhibits wet lIXII expansion and would be expected to be suppressed. This is because latex theoretically has no water content. This is because it prevents it from entering the mixture. Moisture due to the formation of eLringte Limit the amount of water added necessary to pre-empt wet expansion. Furthermore, hardening H AC / By increasing the tensile strength of gypsum compositions, one can make polymeric latex compounds produces an intermediate inhibitory effect, thus reducing any tendency of the composition to swell would expect that.

Additionally, latex can be used as a drywall bond as shown in U.S. Pat. No. 4,294,622. It was added to the gypsum mixture for use as a compound. Also, U.S. Patent No. 4.

No. 088, No. 804 discloses an agent for reducing HTA collection aggregates in which latex is finely divided; Portland cement at a thickness of approximately 2ξμl or 2 mils or more, with a rust inhibitor and Or it shows that it was added to high alumina cement. High alumina cement A combination of lithium and latex is also disclosed in U.S. Pat. No. 4,352.

As shown in No. 693.

Traditionally cement-based rigid insulation stucco materials and protective coverings are , metal tops are used to reduce or adjust cracks by shrinkage of the cementitious mixture. It required the use of net (+ net ath), m fiber, and mesh.

The addition of latex to Portland cement and other sand-hydraulic cements It is well known to improve performance and increase tensile and flexural strength. However, this Addition of latex to cement alone does not particularly reduce final drying shrinkage. . In some instances, latex solids are replaced with water and polymer solids are used to convert water/cement. Drying shrinkage will increase unless the drying ratio is reduced. Additionally, one or Latex emulsion or unstable overexpansion in one or more combinations , non-uniform surface finish, slow setting time and/or non-smoky operation. It can cause problems in the quality and final finish.

Previous application of cementitious compositions to porous, absorbent concrete and masonry type surfaces Utilization is from newly utilized cementitious coatings prior to the use of cementitious coatings. surface wetting reduction or Newly made cementum requires saturation of the matrix and starvation due to the absorptive properties of the matrix Rapid loss of mixed water from the coating results in rapid loss of workability and plastic shrinkage. cracks, loss of strength, loss of cohesion, softening of the curing coating, and many other hydraulic cements. properties such as the presence of curing water for proper development, i.e. permeability, etc. It causes many undesirable and disadvantageous effects.

Cementitious coatings such as smoothing, refinishing, resurfacing, etc. and many other Concrete 1, type of product uses hardening compound, Zunawara plastic To reduce shrinkage cracking and drying shrinkage speed, add mist to fog (1n to fog), Nachi, many repeated steps using haze and protection with damp burlap, etc. to ensure proper hydration and increase strength and other such related properties. , for hydraulic cement (curing compound which includes sequentially providing suitable site humidity) Use of the Zunawara moisture curing process Required.

Under many field conditions, such as cold weather or windy days, cementitious coatings 1. In order to get work with suitable materials outdoors it is not impossible to Maintaining an absorbent surface that is dry or saturated can be very expensive1 4 Ru. In addition, deep underground structures that are not easily accessible, as well as tall and double-sided structures. Building Table 1rii is easily or practically protected from premature drying due to excessive evaporation after use. cannot be protected.

These problems are a problem because workers rely heavily on scaffolding and other equipment such as remote work platforms. It becomes especially clear when you are listening. In addition, the substrate is fully saturated and moistened after use. The reliability of materials that require hardening strongly depends on the timing, care, and experience of the worker. Exists.

Summary of the invention The present invention is a self-curing, crack-free, rapid setting method by adding polymerized latex emulsion. Hard, High Rapid Strength, High Bonding, Finish: Improved Cementitious Mixture, Overcoat, Whitewashing, cosmetic plastering, rigid body protection, finishing coating^, resurfacing, repair, mole Alumina cement/gypsum can be removed by applying tar, plastering tiles, etc. The present invention is directed to methods and compositions for improving the performance of cementitious mixtures.

These emulsions are available with or without added drying shrinkage or humidity swelling inhibitors. A self-curing mixture with rapid solidification, improved humidity resistance, and larger size greater durability and firmness, better freeze/thaw resistance, increased corrosion resistance, chemical i.e. salt Increased resistance to penetration and increased stability of length change can be achieved by Ru.

The present invention also has a 4 minute water resistance and moisture resistance that exceeds other common cements. It relates to improving such mixtures in such a way. The present invention is based on polymerization By adding Xemuldine, we can develop workability, solidification time and properties, and improve work performance. Such compositions can be modified to provide a wide range of buffering effects and formulated during manufacturing. The present invention also relates to significantly reducing the requirements for yA adjustment of gypsum. and latex emulsions with or without the addition of humidity swelling and drying shrinkage inhibitors. and the desired humidity or dryness conditions, i.e. long-term volume and length useful for the intended use. Alumina cement compositions can be adjusted by combining them with compounds that cause changes in hardness. related to things. Is cure dry expansion or cure dry expansion required and minimum In certain applications where wet expansion is desired, the present invention lends itself to a wide range of structural uses. To provide a working range with long-term durability and appropriate strength.

Additionally, the present invention reduces the need for metal shingles, fibers, mesh or other reinforcement methods. , or methods for adjusting or improving mixtures such as removing related.

Various latex emulsions and compounds are characterized by their nonionic and anionic surface activity. with respect to changes in cured length when accompanied by agents, foam suppressants and other additives. Under wet and dry conditions, alumina cement/gypsum compositions, especially cement It was also found that no unique hardening was expected with respect to the behavior of the mixture.

The invention focuses on surface wetting, substrate saturation, and cementitious mixtures for finishing. Moisture curing, coating, whitening, recoating, and re-coating to obtain the desired properties. Concerning compositions that do not require paving, repair, tile finishing, concrete, etc. Ru.

In particular, the present invention provides approximately 5% alumina cement based on the amount of alumina cement to reduce drying shrinkage. ~25% by weight of original gypsum and alumina cement to reduce wet swelling The percentage of polymer solids is about 2 to 13 parts by weight based on the weight of gypsum and the amount of gypsum. The first consists of adding a polymerized latex emulsion, such as Concerning a method for reducing wet expansion and drying shrinkage of alumina cement.

Preferably, the amount of gypsum is about 10 to 20 weight percent. In addition, the first polymerization layer The solids content of the Tex emulsion is preferably about 5 to 10 percent by weight. Ru.

This method also uses a base of polymer solids based on the amount of alumina cement and gypsum. to further reduce dry binding, about 2 to 13 percent by weight of A second polymerized latex emulsion can be added. Second polymerization latex The amount of solids is preferably about 5 to 10 weight percent.

The present invention also uses alumina cement as a reference to reduce drying shrinkage. Based on about 5 to 25 weight percent of gypsum and the amount of alumina cement and gypsum. The weight of the polymer is such that the percent polymer solids is about 2 to 13 percent by weight. Dry yield of alumina cement by adding latex emulsion Concerning methods for reducing shrinkage.

The present invention also combines alumina cement and gypsum to further reduce drying shrinkage. The percentage of polymer solids is about 2 to 13 weight percent based on the amount of and adding a second polymerized latex emulsion such as

Preferably, the amount of solids in the second polymerized latex is about 5 to 10 percent by weight. It is.

Additionally, the present invention provides a method for reducing drying shrinkage based on the amount of Portland cement. and about 5 to 25 weight percent of gypsum and the amount of alumina cement and gypsum. Polymerized lattice with about 2 to 13 weight percent polymer solids as a basis. Reduction of drying shrinkage of aluminum cement by adding Tex Emulsion It shows 1711 laws. On the other hand, the moisture content of cementitious composition consisting of alumina cement Methods for reducing moisture expansion include amounts of 55 to 85 weight percent and 5 to 25 weight percent. It discloses gypsum, which has a cementitious composition due to the suppression of wet expansion. The base polymer solids content is about 2 to 13 fflfi percent. Adding 1-polymer latex is the next step.

This method uses the m-view of cementum composition as a reference to further reduce wet expansion. lithium salt in an amount of about 0.01 to 0.5 ffl. The preferred lithium salts are lithium carbonate, lithium citrate, and water. Lithium oxide, lithium acetate or a mixture thereof.

In order to reduce drying shrinkage, approximately 0°1 to 100°C should be applied based on the superposition of the cementitious composition. Up to 25 weight percent of Boatland cement, based on the weight of the cementitious composition Aluminum sulfate or aluminum in an amount of about 0.1 to 15 weight percent as a standard The percentage of polymer solids based on the amounts of cement and gypsum may vary by approx. Can be added.

The invention also provides alumina cement in an amount of about 55 to 85 weight percent; Reduction of drying shrinkage of cementitious compositions comprising 25 to 25 percent of gypsum The method includes determining the percentage of polymer solids based on the amount of cementitious composition. adding a first polymerized latex having a content of about 2 to 13 weight percent; The purpose is to reduce drying shrinkage.

Other drying shrinkage inhibitors as mentioned above can also be added.

The present invention also includes about 55 to 85 weight percent alumina and about 5 to 251 i weight percent. - Discloses a method for reducing drying shrinkage and wet expansion of cementitious compositions made of gypsum of St. This method calculates the percent polymer solids based on the cementitious composition. Drying shrinkage is performed by adding a first compound latex having a content of about 2 to 13 weight percent. The polymer solids content is approximately 2 to 13% by weight based on the cement F1 composition. Adding a second polymer latex such as % to reduce wet swelling It's more than that.

Description of preferred embodiments Applicants believe that when the cementitious composition is mixed with water, it solidifies rapidly and during solidification substantially no It is possible to form a hard mass with high compressive strength without physical shrinkage. discovered a cementitious composition that exhibits a reduced change in wet and dry volume under conditions of . These compositions also have high fluid permeability and high bond strength. these Improvement of alumina cement, gypsum and gypsum using lithium salts according to the present invention Controlling the expansion of cementitious compositions consisting of mixtures with polymerized latex emulsions This is achieved by Special cementitious composition acts as a drying shrinkage inhibitor Alumina cement, gypsum, boatland, one or more polymeric latexes From an amount of lithium salt that effectively acts as an emulsion and wet expansion inhibitor. Become.

Therefore, one object of the present invention is to provide a solution that, when mixed with water, solidifies in a relatively short period of time and produces an excess amount of water. Wetting or drying hardens the cell without causing a volume change and forming a hard mass. By providing a ment quality composition. Another object of this invention is that alumina cement , gypsum, polymerized latex emulsions, drying shrinkage inhibitors and wet swelling inhibitors Changes in curing volume of cementitious compositions, including changes in curing volume of cementitious compositions containing The objective is to provide a method for suppressing this phenomenon. Wet expansion is based on alumina cement and Ishii. between 0.01 and 0.5 weight basis I, preferably O, Ql and 0.3 weight basis Suppressed by the addition of lithium salts, which is effective between % and %.

between about 55 and 85, preferably 60-80, most preferably 65-75 weight percent cent alumina cement and between about 5 and 25, preferably between 1 and 20 It is desirable to use gypsum of heavy duty: Toshii. Cured drying shrinkage inhibitor bottle toland cement A yoke perimeter over 25 percent weight, preferably between about 1 and 20 percent When the polymerized latex emulsion is added at the , i.e. alumina cement in this example), gypsum and portland cement. Added on a weight percent basis between about 2 and 13, preferably between about 5 and 10 added.

Examples of gypsum suitable for use in the present invention are disclosed in U.S. Pat. No. 4,357,166. , the contents of which may be found herein expressly incorporated by reference. Ru.

An example of a heavy latex emulsion suitable for use in the present invention is methyl cellulose. Z, H1 and 7 xyethyl cellulose, polyvinyl alcohol, styrene, divinyl ethylene, methyl methacrylate-1, styrene and methyl methacrylate Lu-1 or maleic acid anhydride copolymer, acrylic acid and acrylic acid ester VJ4 fat, vinyl acetate homopolymer emulsion, vinyl acetate-acid Lillink copolymer, vinyl chloride with internal plasticization and external plasticization copolymer, polyacrylic acid emulsion, styrene-butadiene copolymer, chloride Vinyl-vinylizoin chloride copolymer, vinyl chloride-vinylidene chloride-acrylic acid -ter-polymer, copolymer of methyl methacrylate-1 and methacrylic acid, Acrylic acid, crotonic acid, ichconic acid or similar unsaturated carboxylic acids; methyl meth Copolymer of Kryley-1 and ethyl acrylate, 2-ethyl hexyl acrylate esters, butyl acrylate or similar esters of acrylic acid, types mentioned above. Acids: Vinyl acetate and acrylic acid, methacrylic acid, crotonic acid or similar acids. Copolymers with esters of saturated acids, subsequently modified to contain carboxyl groups. Vinyl acetate and acrylic acid, methacrylic acid, crotonic acid and similar Copolymers with unsaturated acids or salts of these acids; vinyl pyro Combination of lydone with acrylic acid, methacrylic acid, crotonic acid or similar unsaturated acids polymers which also contain esters of these acids as monomers Anhydrides of unsaturated acids such as maleic acid and styrene, di-isobutylene Copolymers with suitable unsaturated monomers such as tyrene, methyl vinyl ether ; Partial hydrolysis of acrylamide, methacrylamide and acrylonitrile Polymers and copolymers; polyethylene oxide and acrylic acid, methacrylic acid etc. and graft copolymers of methyl acrylate and methyl methacrylate. Contains polymers.

Other suitable polymers and specialized commercially available polymers are described in U.S. Pat.

Nos. 229 and 224, the contents of which are clearly incorporated into the references. Ru.

The polymer latex emulsion used in the present invention can be used to remove plastic particles in water. It is a colloidal dispersion. These particles are usually separated when concrete is mixed. Prevent or minimize the aggregation effect with multivalent ions found in chemical compounds and anionic or nonionic surfactants that prevent agglomeration through strong shear forces. stabilized by a surface coating of These surfactants foam when agitated. Concrete 1. It is advantageous to incorporate an anti-foaming agent therein.

Examples of nonionic surfactants include, for example, glycerol monostearate 1. Ethylene glycol lautate, propylene glycol monostearate, of sorbitol monolaurate and pentacristol monostearate. Oxidized fatty acid esters such as the reaction products of ethylene oxide and oleic acid Acid derivatives of ethyl 1/one products; ethylene oxide and acid derivatives such as steryl alcohols. Condensation products with alcohols; and ethylene oxide and di-t-butylhenoxyno Naoxy-ethylene-ethanol (di-t-hutylpheoxynona) Phenols such as oxy-ethylene-ethanol), naphthos It is a condensation product of phenol and alkyl phenol. S! ! What is better is oxidation It is a condensate of tyrene and alkylphenol.

Examples of anionic surface activity include, for example, dodenlebenzene sodium sulfone. Alkyl aryl sulfone such as -1; sodium lauryl; Sulfa-1 derivatives of quaternary fatty alcohols such as Sulfa-1 (i.e. Alcohols with at least 9 carbon atoms, but usually no more than 17 carbon atoms) : Sulfonated animal and vegetable oils such as sulfonated fish and castor oil; phonated cyclic hydrocarbons; etc. Anionic surface bait activity of cement additives of the present invention The ingredients of the sex agent are sodium high-grade alcohols such as sodium lauryl sulfate-1. Alkyl sulfate, preferably alkyl/aryl, sulfonate surfactant, such sodium higher alkyl sulfate-1 surfactant, A mixture of lithium higher alkyl sulfate 1 such as be.

Each polymer has a different effect on the resulting cementitious mixture; These polymers are available in any conventional manner.

(11 Adjustment or reduction of wet expansion of the composition (2) Adjustment or reduction of drying shrinkage of the composition The effect of polymers in the reduced-taste cement ffiffd compound was determined by routine work experiments. This can be easily determined by a person skilled in the art. Next, regarding the determination of the effect of special polymers in the composition. For example, if the polymer is added to achieve the desired result, Addition of latex emulsion to cement reduces wet swelling but reduces drying yield. For increased shrinkage, add gypsum or polymer latex to reduce wet expansion can reduce wet swelling of the composition. If the composition is used in a dry environment If used, wet expansion adjustment by these additives would be unnecessary.

As mentioned above, each polymer has a different effect, and from the same chemical department Even polymers produce different effects in cement. The different effects encountered are The different anions used to form latex emulsions are Due to non-ionic compounds. However, the effectiveness of each polymer cannot be determined in daily work. The exact nature of the cause of this effect does not seem to be important, since Those skilled in the art will understand that these polymers can be combined to form desirable combinations. You can get results. For example, reducing wet swelling and drying polymers reduce shrinkage. It can be included in a polymer to provide both effects to the composition.

Examples of polyorganosiloxanes include organosilane and It is a synthesis product resulting from the polymerization of diols.

However, R and R in the above formula are alkyl, aryl, aralkyl, and alkaryl. or an organic group such as a heterocyclic group, where n is one or more show. In addition, due to the presence of organo-silane-monol, organo-silane-diol Polymerization products and organo-silane triols, mixtures of diols and monools Condensation products obtained from the compounds are also used. The +11 substituted product of siloxane is , preferably lower alkyl (i.e. methyl, ethyl, propyl), cyclohexyl Or phenyl. Most preferred is methyl, a condensation of methylsilicol. The most preferred is a condensation product of dimethyl silane diol. Ru.

Polyorganosiloxane is a type of “silicon fluid”. ), commercially available as “silicon emulsion” and “silicon compound” It is commercially available in the various formats indicated, the latter being finely divided. improved by the addition of a small percentage of silica or other inert splitting solids. It is a siloxane. Any of these forms can be used to practice the invention.

In addition to the above-mentioned essential components of the cementitious composition of the present invention, a viscosity adjusting device, a surfactant , retardants, accelerators, gas generating or degassing agents, fly ash, bombing aids. pumping aids (+vater retentate) Additional ingredients such as ivity aids), fillers, and crushed stone can also be used. .

The crushed stone for concrete 1 used in the present invention is a mixture of conventional sand and sand. manufactured masses such as gravel, crushed stone or similar materials, or naturally occurring You can use chunks of ore.

The Cement 11 composition of the present invention is suitable for obtaining cement mixtures of desirable flow and consistency. It is made by simply mixing cement with additives. On the other hand, polymerized latte cross-emulsions, non-ionic and anionic surfactants, and polyorganosylene Pre-combine xane with foaming sedative and then cement the resulting mixture Cement composition of the invention as a unitary product by incorporating into the 770 compound It is generally convenient to create cement), mortar, or concrete 1 -In preparing the mixture, of course, all the various additive ingredients are added first. It is understood that this is not necessarily necessary. For example, the present cement, mole Tar or concrete 1/Mixture is latex coagulation, polyorganosiloxa foam control agent and additional nonionic and anionic surface activity as required. Polymerization lattice containing sufficient anionic and nonionic surfactants to avoid obtained by adding separately the required amount of xemulsion. resulting group The composition is particularly effective in producing cementitious compositions with reduced wet swelling; The material solidifies in a relatively short period of time, producing a hard mass with high compressive force and high corrosion resistance. Possessing high penetration and high binding strength to itself and others, it is virtually invisible during solidification. Forms without physical shrinkage and excessive dry-cure volume changes.

f2 Hydraulic cements modified with or without wet expansion or drying shrinkage inhibitors The addition of gypsum to cement polymers results in lower water/cement ratios, improved workability, and plasticization. effect, rapid solidifying materials, dimensionally stable materials, self-hardening materials, high rapid strengthening cement mixtures and volume stabilizers with or without self-curing, mechanical restraint or reinforcing equipment. You can make a mixture with. Additionally, some latex emulsions may Increase drying shrinkage of a constant hydraulic cement 7 stone ft mixture without Emulsions may suddenly dry out in the same mixture as wet or over wet. I found out that it does.

Furthermore, if a certain hydraulic cement/gypsum formulation is considered a stable amount, unless adjusted with wet swelling inhibitors and/or drying shrinkage inhibitors. Mixing a certain latex emulsion is of no use when it suddenly becomes wet and acts in dry conditions. In addition, very low absorption (low permeability cement) A quality mixture is made by adding certain hydraulic cement and polymer modifiers to the plaster and still maintaining its functionality. Invented by mixing at water to cement ratios as low as 20% while holding Ta.

Furthermore, the cementitious mixture that makes the invention of Party B useful is a volumetrically stable crack-free material. Self-curing, high bonding, long-lasting, freeze/thaw resistant mixture with low water permeability Prescriptions can be made to create . This stuff is useful but requires compressibility, ventilation breathability, thermal coefficient of expansion, and debonding, blistering whitewashing, finishing with volume stability for removal of cracks and reduction of moisture infiltration. Top coat, joint finishing (tuck-pointing), tile cement Tile grouting, top removal, straightening, crack repair, resurfacing , encapsulation, water resistant, moisture protection, concrete, masonry, brick, stone, rock, tile etc. It is not limited to concrete, etc. that can be used for Furthermore, the present invention Covers dents, cracks, tears, etc. on the surface of foamed glass due to volume changes. Dimensional stable and compatible coatings and adhesives that can be applied to foamed glass without It is something that provides things.

Retarders, accelerators, surfactants, defoamers, moisture reducers, stearates, waterproofing agents, Pigments, fillers, sand, aggregates, fly ash, fumed silica (fu+ie si' li'ea) chemical and plysieal blowing agent), thixotropy s), whitening agents, and thickening agents may also give favorable results. Either dry cement mixture or emulsion or mixing water to obtain Can be added.

The scope of the invention is further described in connection with the following example, which is simply describes the purpose of the illustrations and does not limit the scope of the invention in any way. It is not intended to be construed as

(Example 1) High alumina cement, gypsum, and sand rhamnite in proportions of 40/10150 ( lumn + te) of cement mixture was mixed with 83.3 - of water.

- Mixed with Toratex emulsion. Dry hardened bar after 1 day up to +2610 Expanded. This means that a special latex emulsion has a hydraulic cement composition of 7 gypsum. It also illustrates the important and potentially harmful amount of expansion hardening that can be obtained.

Latex can improve certain properties in a mixture, such as cohesion, but large volume changes It is not effectively useful for

(Example 2) Using this same cement 1lliK compound as described in Example 4, 500 g of 0.07 g of lithium salt (lithium carbonate) was added per cement mixture. child The same water and latex as described in Example 4 were added to the cement mixture. 1 day Afterwards, the dry cured bar expanded by only +263. Except for 0.1g of lithium carbonate. Other mixtures of the same composition were added. The result was a dry expansion of +219 in one day! 1 piece Met. This means that lithium salts or otherwise unhealthy mixtures can be cured. Indicates that

(Example 3) Rhamnite cement mixture with gypsum and drying shrinkage inhibitor, Boatland cement/ They were mixed at a ratio of 7,510,067,150. Add the same e as in the above example to this mixture. BASF%J's Thretin Acrylate Latex Emulsion at J'& Mixed. Gil'J expansion was adjusted to only +92 in one day, and the dry hardened bar was It simply expanded to 168. This indicates that the use of dry shrinkage inhibitors and wet tension inhibitors proves that certain hydraulic cement/stone-IF/latex mixtures are advantageous. do.

(Example 4) The same cement mixture as in Example 1 was mixed with water and Reiehol in the same proportions as above. Mixed with acrylic latex provided by dehes+ie*l Ta. In one day, the cured bar had a shrinkage of -124, while the wet bar expanded to +680. same Another cement mixture of the composition was mixed with water in the same proportions as above. Reieh Carboxylated styrene provided by old chemical Mixed with butadiene latex emulsion. The shrinkage of the dried bar after one day is -1401 Meanwhile, the wet bar expanded and cracked. This is true for seminars like this. Re-curing unexpected hardening of latex on the integrity and length changes of the component mixture. This is an example.

(Example 5) Another cement mixture with the same composition as Example 1 was provided by Polysar. Mix the styrene-butadiene latex emulsion with mixed in the same proportions. The drying shrinkage after 3 days was -390. Another one with the same composition of cement l-mixture in the proportions mentioned above, Mixed with Krylic latex emulsion. The result was -124 in 3 days. It was a contraction. This shall be in contrast to the Portland cement mixture only. All non-Portland hydraulic cement/gypsum cement mixtures with different latex This illustrates the unexpected hardening that marsillons can cause.

The invention disclosed herein is sufficiently calculated to achieve the objectives stated above. While this is clear, numerous improvements and implementations have been devised by those skilled in the art. It should be noted that the added claims are the true meaning of the present invention. It is intended to describe such modifications and embodiments as are within the spirit and within the invention. .

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Claims (1)

[Claims] Having described our invention in this way, we claim that it is new and that it is protected by a Letters Patent. Those who desire testimony are: 1. (a) To reduce drying shrinkage, approximately 5 to 5 25 percent by weight gypsum; (b) weight based on the amount of alumina cement and gypsum to reduce wet expansion; a first polymerized latte having a percentage of combined solids of about 2 to 13 percent by weight; wet expansion of alumina cement by adding xemulsion, How to reduce drying shrinkage. 2. Claim 1 wherein the amount of gypsum is in the range of about 10 to 20 weight percent. The method described in section. 3. The solid content of the first polymerized latex emulsion is about 5 to 10 percent by weight. A method according to claim 1 within the scope of. 4. Furthermore, in order to still reduce drying shrinkage, the amount of alumina cement and gypsum is Generally, the second emulsion has a percent polymerized solids of about 2 to 13 percent by weight. The patent claim consists of adding a second polymerized latex emulsion such that The method described in Scope No. 1. 5. The solid content of the second polymerized latex emulsion is about 5 to 10 percent by weight. A method according to claim 4 within the scope of. 6. (a) To reduce drying shrinkage, approximately 5 gypsum in an amount of from 25 percent by weight; (b) To further reduce drying shrinkage, the amounts of alumina cement and gypsum are and the percent polymer solids is about 2 to 13 percent by weight. of alumina cement by adding monopolymerized latex emulsion and How to reduce drying shrinkage. 7. To reduce wet expansion, the amount of alumina cement and gypsum is such that the percent solids of the emulsion is about 2 to 13 percent by weight. By further adding a second polymerized latex emulsion, The method described in section 6. 8. The solid content of the second polymerized latex emulsion is about 5 to 10 percent by weight. The method of claim 7 within the scope of. 9. Claim 6, wherein the amount of gypsum is in the range of about 10 to 20 weight percent. The method described in section. 10. The solid content of the first polymerized latex emulsion is about 5 to 10 percent by weight. The method of claim 6 within the scope of claim 6. 11. (a) Approximately 1% based on the amount of alumina cement to reduce drying shrinkage. gypsum in an amount of 0 to 20 weight percent; (b) Based on alumina cement and gypsum to further reduce drying shrinkage. The polymerized latte has a percentage of polymerized solids of about 5 to 10 percent by weight. kusu emulsion, A method for reducing drying shrinkage of alumina cement, which comprises adding . 12.55 to 85 weight percent alumina cement and 5 to 25 weight percent In a method of reducing wet swelling of gypsum and karanaro cementitious compositions of St. The percent polymerized solids is about 2 to 13 percent by weight based on the amount of cementitious composition. In order to suppress the wet expansion of the first polymerized latex emulsion, it is A method for reducing wet swelling of the cement composition described above, comprising adding a filtrate to the cement composition. 13. The solid content of the first polymerized latex emulsion is about 5 to 10 percent by weight. 13. The method of claim 12 within the scope of claim 12. 14. About 0.01 to 0.5 percent by weight based on the weight of the cementitious composition. The method according to claim 12, which comprises adding an amount of lithium salt. Law. 15. Lithium salts include lithium carbonate, lithium citrate, lithium hydroxide, and lithium acetate. Claim 14, characterized in that it is lithium or a mixture thereof. the method of. 16. Based on the weight of the cementitious composition to reduce drying shrinkage, approximately 0. By further adding Portland cement in an amount of 1 to 25 weight percent. 13. The method according to claim 12, which comprises: 17. To reduce drying shrinkage, approximately 0.0% based on the weight of the cementitious composition. further adding aluminum sulfate in an amount of 1 to 15 percent by weight. A method according to claim 12. 18. A second emulsion based on the amount of hydraulic cement and gypsum to reduce drying shrinkage. John's polymer solids percentage is about 2 to 13 weight percent. Claims further comprising the addition of a second polymerized latex emulsion. The method according to paragraph 12. 19. The solid content of the second polymerized latex emulsion is about 5 to 10 percent by weight. 19. The method of claim 18 within the scope of claim 18. 20. alumina cement in an amount of about 55 to 85 weight percent and about 5 to 25 percent by weight; In a method for reducing drying shrinkage of cement compositions consisting of gypsum with weight percent amounts , the method uses polymers as a basis for cementitious compositions to reduce drying shrinkage. The first polymerized latte has a solids percentage of about 2 to 13 weight percent. A method for reducing drying shrinkage of the cement composition described above, which comprises adding a coax. 21. The amount of solids in the first polymerized latex emulsion is about 5 to 10 percent by weight. 21. The method of claim 20 within the scope of the invention. 22. To reduce drying shrinkage, approximately 0.1 to 2 A patent claim consisting of further adding 5 weight percent amount of Portland cement. Scope of Claim 20. The method according to item 20. 23. about 0.01 to 0.5 percent by weight based on the weight of the cementitious composition According to claim 22, the method further comprises adding an amount of lithium salt. How to put it on. 24. approximately 0.1% by weight of the cementitious composition to reduce drying shrinkage. further adding aluminum sulfate in an amount of 15 to 15 percent by weight. A method according to claim 20. 25. In order to reduce drying shrinkage, the amount of hydraulic cement and gypsum is The percent polymerized solids of the emulsion is about 2 to 13 percent by weight. A patent claim consisting of further adding a second polymerized latex emulsion such as The method according to item 20. 26. about 55 to 85 weight percent alumina cement and about 5 to 25 weight percent alumina cement; Reduces the drying shrinkage and wet swelling of cementitious compositions comprising a percentage of gypsum. In the method of reducing a. First emulsion based on cementitious composition amount to reduce drying shrinkage The first polymerization layer has a percent polymerized solids of about 2 to 13 percent by weight. tex emulsion and b The weight of the second emulsion based on the amount of cement composition to reduce wet expansion. a second polymerized latte in which the percentage of combined solids is about 2 to 13 percent by weight; emulsion and A method for reducing drying shrinkage and wet swelling of the above cementitious composition, which comprises adding . 27. The solid content of the first polymerized latex emulsion is about 5 to 10 percent by weight. 27. The method of claim 26 within the scope of claim 26. 28. The solid content of the second polymerized latex emulsion is about 5 to 10 percent by weight. 27. The method of claim 26. 29 in an amount of about 0.01 to 0.5 weight percent based on the weight of the yarn composition. Claim 26, further comprising adding a lithium salt of Method. 30. Lithium salts include lithium carbonate, lithium citrate, lithium hydroxide, and lithium acetate. 30. The method of claim 29, wherein the metal is lithium or a mixture thereof. 31. Based on the weight of the cementitious composition, to reduce drying shrinkage, approximately. 1no without further addition of Portland Cenmeth in an amount of up to 25 weight percent. 27. The method according to claim 26. 32. To reduce drying shrinkage, approximately 0.0% based on the weight of the cementitious composition. A special method comprising the further addition of 1 to 15 weight percent aluminum sulfate. The method according to claim 26.