CN113896481B

CN113896481B - Normal-temperature self-crosslinking water-based epoxy resin modified cement-based mortar bi-component material

Info

Publication number: CN113896481B
Application number: CN202111320588.5A
Authority: CN
Inventors: 不公告发明人
Original assignee: Shanghai Brotek Industrial Product Design Co ltd
Current assignee: Shanghai Brotek Industrial Product Design Co ltd
Priority date: 2021-11-09
Filing date: 2021-11-09
Publication date: 2022-12-13
Anticipated expiration: 2041-11-09
Also published as: CN113896481A

Abstract

The invention provides a normal-temperature self-crosslinking type waterborne epoxy resin modified cement-based mortar bi-component material. The bi-component material contains a component A and a component B, wherein the component A contains 12-30wt% of normal-temperature self-crosslinking type waterborne epoxy resin, optional 0.10-1.0wt% of defoaming agent and the balance of water based on the total weight of the bi-component material, the epoxy equivalent of the normal-temperature self-crosslinking type waterborne epoxy resin is 300-600, the component B contains cement, sand, an anti-settling agent, a water reducing agent and a defoaming agent, the component A and the component B are packaged independently, and the bi-component material does not contain a curing agent. The invention also provides cement mortar. The cement mortar prepared from the bi-component material has the characteristics of excellent mechanical strength, good impact toughness, good cracking resistance, excellent water resistance, excellent impermeability, good volume stability, high wear resistance, high freezing resistance, high hardening speed, grade A fire resistance, environmental safety and the like.

Description

Normal-temperature self-crosslinking water-based epoxy resin modified cement-based mortar bi-component material

Technical Field

The invention relates to the technical field of chemical building materials, in particular to a normal-temperature self-crosslinking type water-based epoxy resin modified cement-based mortar bi-component material.

Background

The cement product has the characteristics of low price, bearing pressure resistance, water resistance, moisture resistance, fire resistance, environmental protection, safety and the like, so that the cement and steel jointly form the most important building material. However, common cement products are the most typical brittle materials, are not resistant to pressure and pulling and are not resistant to folding, the porosity of the internal structure enables the cement products to be water-resistant, but not impervious, difficult to clean, and the cement products are easy to generate drying shrinkage, moist and swelling due to changes of environmental humidity, so that the problems of unstable volume, drying cracking and the like exist. Therefore, various modification methods for cement-based materials are carried out.

The polymer resin modified Cement-based material has remarkable effect in improving the toughness and impermeability of the material, wherein the waterborne Epoxy resin modified Cement-based material which is called ECC Technology in the industry is rapidly developed, and the Cement-based material has excellent performances in the aspects of mechanical strength, crack resistance, impact toughness, permeation resistance, moisture resistance, water resistance, wear resistance, fire resistance, environmental protection safety and the like, so the Cement-based material is applied to the fields with high performance requirements such as structure reinforcement, heavy-duty terrace, chemical corrosion resistance, moisture resistance, water resistance and the like.

The epoxy resin applied to the modified cement material is generally low molecular weight bisphenol A diglycidyl ether (bisphenol A type epoxy resin shown in the structural formula 1), common specifications of E-51 and E-44 are 190-220 of epoxy equivalent, and polymerization degree n =0.1-0.3. The emulsified epoxy resin water-based emulsion and aliphatic amine or alicyclic amine curing agent are subjected to crosslinking reaction at normal temperature to form a high-strength high-toughness three-dimensional crosslinking network body, and the high-strength high-toughness three-dimensional crosslinking network body and a cement hardened body are combined into an interpenetrating network structure, so that the functions of strengthening and improving the material performance are achieved.

The crosslinking reaction of the epoxy resin has two modes of external crosslinking and self-crosslinking. The external crosslinking means that an additionally added active group is crosslinked and cured with the epoxy resin. The prior water-based epoxy resin modified cement adopts an external crosslinking type double-liquid-component system, and a curing agent is added before construction. From the practical application, the system of the external crosslinking curing reaction has fast reaction speed of the resin and the curing agent, complete crosslinking and the characteristic of the crosslinked resin can be quickly embodied in the modified cement-based material, so the material characterized by ECC technology is widely applied. However, short sheets of water-based epoxy modified cement-based materials that are externally cross-linked are also very apparent. Firstly, the application of the external crosslinking epoxy cement system has high requirements on the use environment, the high-temperature curing is fast in summer, the working life is short, the low-temperature curing is slow or even not cured in winter, and the drying and hardening time is obviously prolonged or even not cured when the external crosslinking epoxy cement system is used in a high-humidity environment, underground or a closed space. Secondly, when in use, the epoxy resin and the curing agent must be uniformly premixed and required to be timely stirred with the powder part, and the production and the use of the material are relatively complex.

The self-crosslinking means that the polymer resin has one or more active groups and is crosslinked under the action of heating or a catalyst, and the normal-temperature self-crosslinking not only solves the defects and contradictions existing in an external crosslinking mode due to the advantages of the temperature condition of a curing reaction, but also brings great convenience to the production, storage and application of materials and has good market application prospect.

The epoxy resin can be cured according to the following reaction formula 1 under an alkaline environment formed by cement hydration, which is the application basis of a self-crosslinking mode in the field of epoxy resin modified cement:

in the research and practice of the prior self-crosslinking water-based epoxy resin modified cement-based material without matching of curing agent, the adopted epoxy resin is still the low molecular weight bisphenol A epoxy resin emulsion widely applied in ECC technology. The cement-based material modified by the way has obviously improved impermeability and anti-carbonization capability, but has limited improvement on mechanical strength and toughness, and no practical application value. Although studies have been made to further improve the mechanical properties of the cured products by means of high-temperature and high-humidity curing, no commercial products have yet been developed.

Disclosure of Invention

The invention mainly provides a normal-temperature self-crosslinking type waterborne epoxy resin modified cement-based mortar bi-component material, wherein the bi-component material comprises the following components in parts by weight: and (2) component A: the self-crosslinking type epoxy resin composition comprises 12-30wt%, preferably 15-25wt% of normal-temperature self-crosslinking type water-based epoxy resin, optional 0.10-1.0wt% of defoaming agent and the balance of water, wherein the weight of the component A is calculated by the total weight of the component A; wherein the normal-temperature self-crosslinking water-based epoxy resin is a normal-temperature self-crosslinking water-based epoxy resin with the epoxy equivalent of 300-600, preferably 300-550, more preferably 400-550, and preferably bisphenol A epoxy resin; and a component B: it contains cement, sand, anti-settling agent, water reducing agent and defoaming agent; wherein the A component and the B component are packaged independently, and the two-component material does not contain a curing agent.

In one or more embodiments, the room-temperature self-crosslinking waterborne epoxy resin is provided in the form of an emulsion, and the component a contains a room-temperature self-crosslinking waterborne epoxy resin emulsion, water and optionally an antifoaming agent, wherein the content of the room-temperature self-crosslinking waterborne epoxy resin emulsion is 30-50wt%, preferably 35-45wt%, based on the total weight of the component a.

In one or more embodiments, the a component comprises, based on the total weight of the a component: 35-45wt% of the normal-temperature self-crosslinking water-based epoxy resin emulsion, 0.50-0.80wt% of a defoaming agent and the balance of water, wherein the normal-temperature self-crosslinking water-based epoxy resin is bisphenol A epoxy resin emulsion with the epoxy equivalent of 400-550.

In one or more embodiments, the a component comprises, based on the total weight of the a component: 35-45wt% of the normal-temperature self-crosslinking water-based epoxy resin emulsion, 0.55-0.80wt% of a defoaming agent and the balance of water, wherein the normal-temperature self-crosslinking water-based epoxy resin is bisphenol A epoxy resin emulsion with the epoxy equivalent of 550.

In one or more embodiments, the a component comprises, based on the total weight of the a component: 35-45wt% of the normal-temperature self-crosslinking water-based epoxy resin emulsion, 0.55-0.80wt% of a defoaming agent and the balance of water, wherein the normal-temperature self-crosslinking water-based epoxy resin is bisphenol A epoxy resin emulsion with the epoxy equivalent of 300.

In one or more embodiments, the a component comprises, based on the total weight of the a component: 35-45wt% of the normal-temperature self-crosslinking water-based epoxy resin emulsion, 0.55-0.80wt% of a defoaming agent and the balance of water, wherein the normal-temperature self-crosslinking water-based epoxy resin is bisphenol A epoxy resin emulsion with the epoxy equivalent of 400.

In one or more embodiments, the B component contains, based on the total weight of the B component:

20-45wt%, preferably 30-40wt%, more preferably 35-40wt% cement,

45-70 wt.%, preferably 55-70 wt.%, more preferably 58-65 wt.% of sand,

0.005-0.05 wt.%, preferably 0.005-0.02 wt.%, of an anti-settling agent,

0.10-0.30 wt.%, preferably 0.13-0.25 wt.% of a water reducing agent, and

0.05-0.30wt%, preferably 0.08-0.25wt%, more preferably 0.12-0.18wt% of a defoaming agent.

In one or more embodiments, the defoamer is selected from a mineral oil type defoamer, a non-mineral oil type defoamer, or a combination.

In one or more embodiments, the cement is selected from one or more of ordinary portland cement, white portland cement, high belite sulphoaluminate cement, and aluminate cement.

In one or more embodiments, the sand is calcium sand, quartz sand, or a combination thereof.

In one or more embodiments, the anti-settling agent is selected from one or more of fumed silica, organically modified bentonite, and attapulgite.

In one or more embodiments, the water reducer is selected from one or more of a polycarboxylic acid high efficiency water reducer, a naphthalene based water reducer, and a melamine based water reducer.

In one or more embodiments, the A component also contains a pigment or mill base.

In one or more embodiments, the B component further comprises one or more of 0-20wt% of quartz powder or heavy calcium powder, 0-2.0wt% of an expanding agent, 0-1.0wt% of anti-crack fibers, 0-0.05wt% of a thickening agent, 0-0.10wt% of a coagulation accelerator, 0-0.20wt% of a retarder and 0-0.01wt% of a thixotropic agent based on the total weight of the B component.

In one or more embodiments, the bulking agent is selected from calcium sulfoaluminate based bulking agents, calcium oxide based bulking agents, or combinations thereof.

In one or more embodiments, the crack resistant fibers are selected from one or more of glass fibers, polypropylene monofilament fibers, and steel fibers.

In one or more embodiments, the thickening agent is selected from cellulose ethers, starch ethers, or combinations thereof.

In one or more embodiments, the coagulant is selected from lithium carbonate, lithium sulfate, calcium formate, or a combination thereof.

In one or more embodiments, the set retarder is selected from citric acid, tartaric acid, sodium citrate, or a combination thereof.

In one or more embodiments, the thixotropic agent is diutan.

In one or more embodiments, the B component contains, based on the total weight of the B component: 35 to 37 weight percent of ordinary portland cement PO42.5, 50 to 55 weight percent of quartz sand with the grain size of 0.1 to 0.3mm, 8.0 to 10 weight percent of quartz sand with the grain size of 0.3 to 0.6mm, 0.01 to 0.015 weight percent of anti-settling agent, 0.13 to 0.25 weight percent of polycarboxylic acid high-efficiency water reducing agent and 0.10 to 0.18 weight percent of defoaming agent.

In one or more embodiments, the B component contains, based on the total weight of the B component: 35 to 37 weight percent of white portland cement PW52.5, 50 to 55 weight percent of quartz sand with the grain size of 0.1 to 0.3mm, 8.0 to 10 weight percent of quartz sand with the grain size of 0.3 to 0.6mm, 0.01 to 0.015 weight percent of anti-settling agent, 0.13 to 0.25 weight percent of polycarboxylic acid high-efficiency water reducing agent and 0.10 to 0.18 weight percent of defoaming agent.

In one or more embodiments, the B component contains, based on the total weight of the B component: 35-38wt% of high belite sulphoaluminate cement, 50-55wt% of quartz sand with the particle size of 0.1-0.3mm, 8.0-10wt% of quartz sand with the particle size of 0.3-0.6mm, 0.01-0.015wt% of anti-settling agent, 0.13-0.25wt% of polycarboxylic acid high efficiency water reducing agent, 0.05-0.08wt% of coagulant, 0.08-0.10wt% of retarder and 0.10-0.18wt% of defoaming agent.

In one or more embodiments, in the bicomponent material, the weight ratio of the component A to the component B is 10 to 25:100, preferably 15-20:100, more preferably 17-18:100.

the invention also provides a normal-temperature self-crosslinking water-based epoxy resin modified cement mortar, which comprises 5.0-9.0wt%, preferably 6.0-7.0wt% of normal-temperature self-crosslinking water-based epoxy resin emulsion, 0.10-1.0wt%, preferably 0.10-0.50wt%, more preferably 0.10-0.30wt% of defoaming agent, 20-40wt%, preferably 25-35wt%, more preferably 30-35wt% of cement, 40-65wt%, preferably 45-65wt%, more preferably 50-60wt% of sand, 0.001-0.01wt%, preferably 0.005-0.01wt% of anti-settling agent, 0.10-0.30wt%, preferably 0.10-0.20wt% of water reducing agent and the balance of water, based on the total weight of the cement mortar; wherein the normal-temperature self-crosslinking water-based epoxy resin is a normal-temperature self-crosslinking water-based epoxy resin with the epoxy equivalent of 300-600, preferably 300-550, more preferably 400-550, preferably bisphenol A epoxy resin, and the cement mortar does not contain a curing agent.

In one or more embodiments, the cement mortar contains the room-temperature self-crosslinking water-based epoxy resin modified cement-based mortar two-component material, or is prepared by the A component and the B component of the room-temperature self-crosslinking water-based epoxy resin modified cement-based mortar two-component material, and optionally adding a proper amount of water.

Detailed Description

It is to be understood that within the scope of the present invention, the above-described features of the present invention and those specifically described below (e.g., in the examples) may be combined with each other to constitute preferred embodiments.

The invention aims to provide a cement-based material modified by normal-temperature self-crosslinking waterborne epoxy resin, which selects waterborne epoxy resin capable of generating rapid self-crosslinking reaction under the condition of pH of a cement hydration liquid phase.

Specifically, the two-component mortar material comprises an A component and a B component which are independently packaged; wherein the component A contains normal-temperature self-crosslinking water-based epoxy resin emulsion, water and a defoaming agent; the component B contains cement, sand, anti-settling agent, defoaming agent and water reducing agent, and optionally one or more of quartz powder or heavy calcium powder, expanding agent, anti-cracking fiber, thickening agent, coagulant, retarder and thixotropic agent.

Component A

The component A of the invention can contain normal-temperature self-crosslinking water-based epoxy resin, water and optional defoaming agent.

The room-temperature self-crosslinking waterborne epoxy resin suitable for the invention has an epoxy equivalent weight of 300-600, preferably 300-550, and more preferably 400-550. Preferably, the room-temperature self-crosslinking water-based epoxy resin is a bisphenol A epoxy resin with an epoxy equivalent of 300-600, preferably 300-550, and more preferably 400-550.

The ambient self-crosslinking waterborne epoxy resin described herein can be provided in the form of an emulsion. The emulsion usually contains the room temperature self-crosslinking water-based epoxy resin, water and other additives required for preparing the emulsion, such as an emulsifier and the like. It is to be understood that the other additive components in the emulsion may be conventional components required for formulating emulsions, such as emulsifiers, in low amounts, which are generally used for the purpose of forming emulsions, maintaining emulsion stability, preventing breaking of emulsions, etc., so that these components do not materially affect the final properties of the cementitious mortars of the invention. Preferably, bisphenol a type epoxy resin is used. Epoxy resins having the above epoxy equivalent or emulsions thereof, particularly bisphenol a type epoxy resins or emulsions thereof, are commercially available.

When the A component of the present invention is formulated in the form of an emulsion, the solid content in the emulsion may be 40 to 60% by weight.

The component A of the invention can contain 12 to 30 weight percent of normal temperature self-crosslinking water-based epoxy resin with the epoxy equivalent weight in the range of 300 to 600, preferably 15 to 25 weight percent of the total weight of the component A, or can contain 30 to 50 weight percent of normal temperature self-crosslinking water-based epoxy resin emulsion. In some embodiments, the A component of the present invention contains 35 to 45wt% of the room temperature self-crosslinking aqueous epoxy resin emulsion.

To eliminate the foam in component A, a defoaming agent may be appropriately added. Suitable defoamers for the a component of the present invention can be defoamers conventional in the art for cement, including but not limited to mineral oil based defoamers, non-mineral oil based defoamers, and combinations of one or more defoamers can also be used.

The A-component of the present invention may contain 0.10 to 1.0% by weight of a defoaming agent, preferably 0.30 to 0.80% by weight of a defoaming agent, more preferably 0.50 to 0.80% by weight of a defoaming agent, based on the total weight of the A-component.

In some embodiments, the A component of the present invention may also contain an appropriate amount of pigment or mill base. The pigment and the color paste can be various pigments and color pastes which are conventional in the field and can be freely added by a user according to the requirements.

The A component of the present invention may contain a balance of water based on the total weight of the A component. In general, the A component may contain from 50 to 70% by weight of water, preferably from 55 to 65% by weight of water.

In some embodiments, the a component of the present invention comprises: 35-45wt% of normal-temperature self-crosslinking water-based epoxy resin emulsion, 0.50-0.80wt% of defoaming agent and the balance of water, wherein the normal-temperature self-crosslinking water-based epoxy resin is bisphenol A epoxy resin emulsion with the epoxy equivalent of 400-550.

In some preferred embodiments, the a component of the present invention comprises: 35-45wt% of normal-temperature self-crosslinking water-based epoxy resin emulsion, 0.55-0.80wt% of defoaming agent and the balance of water, wherein the normal-temperature self-crosslinking water-based epoxy resin is bisphenol A epoxy resin emulsion with the epoxy equivalent of 550.

In some other preferred embodiments, the a component of the present invention comprises: 35-45wt% of normal-temperature self-crosslinking water-based epoxy resin emulsion, 0.55-0.80wt% of defoaming agent and the balance of water, wherein the normal-temperature self-crosslinking water-based epoxy resin is bisphenol A epoxy resin emulsion with the epoxy equivalent of 300.

In certain specific embodiments, the a component of the present invention comprises: 35-45% of normal-temperature self-crosslinking water-based epoxy resin emulsion, 0.55-0.80wt% of defoaming agent and the balance of water, wherein the normal-temperature self-crosslinking water-based epoxy resin is bisphenol A epoxy resin emulsion with the epoxy equivalent of 400.

Typically, the a component of the present invention is a liquid.

B component

The B component of the present invention is generally a solid. The component B of the invention can contain cement, sand, anti-settling agent, defoaming agent and water reducing agent.

The cement suitable for use in the present invention may be any of a variety of cements commonly used in the art, including one or more of ordinary portland cement, white portland cement, and special cement. The special cement can be high belite sulphoaluminate cement and aluminate cement.

The content of cement may be in the range of 20 to 45wt%, preferably in the range of 30 to 40wt%, more preferably in the range of 35 to 40wt%, based on the total weight of the B component.

The sand suitable for use in the present invention may be any of a variety of sands commonly used in the art including, but not limited to, calcium sand, quartz sand, or combinations thereof. The sand content may be in the range of 45 to 70wt%, preferably 55 to 70wt%, more preferably 58 to 65wt%, based on the total weight of the B component. The particle size of the sand is not particularly limited and may be determined according to the specific use of the mortar of the present invention. In certain embodiments, the invention uses sand having two particle size ranges, one particle size range between 0.1 and 0.3mm (including 0.3 mm), which may be present in an amount of 40 to 60wt%, preferably 45 to 60wt%, more preferably 50 to 55wt%; another range of particle sizes is between 0.3 and 0.6mm (excluding 0.3 mm), and may be present in an amount of 5.0 to 10 wt.%, preferably 8.0 to 10 wt.%.

Suitable defoamers for use in the present invention can be a variety of defoamers known in the art, including but not limited to mineral oil based defoamers, non-mineral oil based defoamers, and combinations of one or more defoamers can also be used. The content of the defoaming agent is 0.05 to 0.30wt% of the defoaming agent, preferably 0.08 to 0.25wt%, more preferably 0.12 to 0.18wt%, based on the total weight of the B component.

Water reducing agents suitable for use in the present invention include, but are not limited to, polycarboxylic acid high efficiency water reducing agents, naphthalene based water reducing agents, melamine based water reducing agents. Typically, the water reducing agent may be present in the individual B-components of the invention in an amount in the range of from 0.10 to 0.30wt%. In certain embodiments, the present invention utilizes a polycarboxylic acid superplasticizer in an amount ranging from 0.13 to 0.25 weight percent, such as 0.15 weight percent or 0.2 weight percent.

The anti-settling agent suitable for use in the present invention may be various anti-settling agents known in the art for use in cement mortars, including but not limited to fumed silica and/or organically modified bentonite, attapulgite. In some embodiments, the thickening agent (especially low-viscosity cellulose ether) and diutan are compounded as the anti-settling agent, so that the product has better flowing property and anti-settling effect than the product of the existing non-diutan anti-settling agent. In the present invention, the content of the anti-settling agent is in the range of 0.005 to 0.05wt%, preferably in the range of 0.005 to 0.02wt%, based on the total weight of the B component.

The component B of the invention can also contain one or more of quartz powder or heavy calcium powder, an expanding agent, anti-cracking fiber, a thickening agent, a coagulant, a retarder and a thixotropic agent.

The amount of quartz powder or triple superphosphate powder suitable for use in the present invention may be in the range of 0 to 20wt%, such as 1.0 to 10wt%, 2.0 to 10wt%, or 8.0 to 20wt% in the B component of the present invention. The particle size is not particularly limited and can be determined according to the specific use of the mortar of the present invention.

The expanding agent suitable for use in the present invention includes, but is not limited to, calcium thioaluminate based expanding agents, calcium oxide based expanding agents or combinations thereof, and may be present in the range of 0 to 2.0wt% in the B component of the present invention. For example 0-0.50wt%, 0-1.0wt% or 1.0-2.0wt%.

The anti-crack fiber suitable for the present invention includes, but is not limited to, one or more of glass fiber, polypropylene monofilament fiber and steel fiber, and the content thereof in the B component of the present invention may be in the range of 0 to 1.0 wt%. For example 0-0.50wt% or 0.20-0.80wt%.

Thickeners suitable for use in the present invention include, but are not limited to, cellulose ethers, starch ethers, or combinations thereof, which may be present in the B component of the present invention in an amount ranging from 0 to 0.05wt%, such as from 0 to 0.03wt%.

The coagulant is an assistant for controlling the whole hardening speed of the material by accelerating the hydration speed of the cement. Accelerators suitable for use in the present invention include, but are not limited to, lithium carbonate, lithium sulfate, calcium formate, or combinations thereof. Typically, the accelerator is present in an amount of 0 to 0.10wt%, such as 0.04 to 0.09wt%. In certain embodiments, component B of the present invention comprises a coagulant in an amount of 0.01 to 0.06 wt.%, such as 0.05 wt.%.

The retarder is an auxiliary agent for controlling the whole hardening speed of the material by inhibiting or delaying the hydration speed of cement. Retarders suitable for use in the present invention include, but are not limited to, citric acid, tartaric acid, sodium citrate, or mixtures thereof. Typically, the retarder is present in an amount of 0 to 0.20wt%, such as 0.05 to 0.10wt% or 0.08 to 0.15wt%. In certain embodiments, the B component of the present invention comprises a retarder in an amount in the range of 0.08 to 0.15wt%, preferably 0.09 to 0.12wt%.

Thixotropic agents suitable for use in the present invention include, but are not limited to diutan, which may be present in the B component of the present invention in an amount ranging from 0 to 0.01 weight percent. For example 0-0.008wt% or 0.001-0.01wt%.

In some preferred embodiments, the B component of the present invention comprises: 35 to 37 weight percent of ordinary portland cement PO42.5, 50 to 55 weight percent of quartz sand with the grain size of 0.1 to 0.3mm, 8.0 to 10 weight percent of quartz sand with the grain size of 0.3 to 0.6mm, 0.01 to 0.015 weight percent of anti-settling agent, 0.13 to 0.25 weight percent of polycarboxylic acid high-efficiency water reducing agent and 0.10 to 0.18 weight percent of defoaming agent.

In some preferred embodiments, the B component of the present invention comprises: 35 to 37 weight percent of white portland cement PW52.5, 50 to 55 weight percent of quartz sand with the grain size of 0.1 to 0.3mm, 8.0 to 10 weight percent of quartz sand with the grain size of 0.3 to 0.6mm, 0.01 to 0.015 weight percent of anti-settling agent, 0.13 to 0.25 weight percent of polycarboxylic acid high-efficiency water reducing agent and 0.10 to 0.18 weight percent of defoaming agent.

In some preferred embodiments, the B component of the present invention comprises: 35-38wt% of high belite sulphoaluminate cement, 50-55wt% of quartz sand with the particle size of 0.1-0.3mm, 8.0-10wt% of quartz sand with the particle size of 0.3-0.6mm, 0.01-0.015wt% of anti-settling agent, 0.13-0.25wt% of polycarboxylic acid high-efficiency water reducing agent, 0.05-0.08wt% of coagulant, 0.08-0.10wt% of retarder and 0.10-0.18wt% of defoaming agent.

The normal-temperature self-crosslinking water-based epoxy resin modified cement-based mortar bi-component material contains the component A and the component B which are independently packaged. Generally, 10 to 25 parts by weight of the A component is used per 100 parts by weight of the B component, and preferably 15 to 20 parts by weight of the A component is used per 100 parts by weight of the B component. In some embodiments, 17 to 18 parts by weight of the A component is included per 100 parts by weight of the B component.

Cement mortar

The invention uses the normal-temperature self-crosslinking type waterborne epoxy resin modified cement-based mortar bi-component material to replace the traditional external crosslinking type epoxy resin-curing agent-cement three-component system, retains the basic characteristics of the ECC technology applied by external crosslinking, and avoids the defects of short high-temperature curing speed and application life, slow or even no curing at low temperature, obviously prolonged drying and curing time or even no curing in a high-humidity environment or underground or closed space and the like in the external crosslinking type application. Meanwhile, the production, transportation and storage of the material are greatly facilitated due to the packaging of the independent components, so that the product is more convenient to use and is more environment-friendly and economical.

Therefore, the invention also provides cement mortar which contains the normal-temperature self-crosslinking water-based epoxy resin emulsion, a defoaming agent, cement, sand, an anti-settling agent and a water reducing agent. The cement mortar of the present invention does not contain curing agents necessary for conventional epoxy resin applications.

The normal-temperature self-crosslinking water-based epoxy resin is a normal-temperature self-crosslinking water-based epoxy resin with the epoxy equivalent of 300-600, preferably 300-550, more preferably 400-550, preferably bisphenol A epoxy resin with the epoxy equivalent of 300-600, preferably 300-550, more preferably 400-550. The content of the normal-temperature self-crosslinking waterborne epoxy resin is 2.0-5.5wt%, preferably 2.5-4.5wt%, more preferably 3.0-4.0wt% based on the total weight of cement mortar. When the room-temperature self-crosslinking type aqueous epoxy resin is provided in the form of an emulsion, the solid content of the emulsion (i.e., the content of the room-temperature self-crosslinking type aqueous epoxy resin) may be 40 to 60wt%, and the content of the emulsion is 5.0 to 9.0wt%, preferably 6.0 to 7.0wt%.

The defoamer can be one conventional in the art for use in cement, including but not limited to mineral oil based defoamers, non-mineral oil based defoamers, and combinations of one or more defoamers can also be used. The content of the antifoaming agent is 0.10 to 1.0wt%, preferably 0.10 to 0.50wt%, more preferably 0.10 to 0.30wt%, based on the total weight of cement mortar.

The cement may be any of a variety of cements commonly used in the art, including one or more of ordinary portland cement, white portland cement, and special cement. The special cement can be high belite sulphoaluminate cement and aluminate cement. The content of the cement is in the range of 20 to 40wt%, preferably 25 to 35wt%, more preferably 30 to 35wt% based on the total weight of the cement mortar.

The sand may be any of a variety of sands commonly used in the art including, but not limited to, calcium sand, quartz sand, or combinations thereof. The content of sand may be in the range of 40-65wt%, preferably 45-65wt%, more preferably 50-60wt%, based on the total weight of the cement mortar. The particle size of the sand is not particularly limited and may be determined according to the specific use of the mortar of the present invention. In certain embodiments, the invention uses sand having two particle size ranges, one particle size range between 0.1 and 0.3mm, which may be present in an amount of 35 to 55wt%, preferably 40 to 50wt%, more preferably 42 to 48wt%; another particle size range is between 0.3 and 0.6mm, and its content may be 3.0 to 10wt%, preferably 5.0 to 10wt%.

The anti-settling agent may be any of various anti-settling agents known in the art for use in cement mortars, including but not limited to fumed silica and/or organically modified bentonite, attapulgite. In some embodiments, the thickening agent (especially low-viscosity cellulose ether) and diutan are compounded to be used as the anti-settling agent, so that the manufactured product has better flowing property and anti-settling effect than the existing product of the non-diutan anti-settling agent. In the present invention, the content of the anti-settling agent is in the range of 0.001 to 0.01wt%, preferably 0.005 to 0.01wt%, based on the total weight of the cement mortar.

The water reducing agent comprises but is not limited to polycarboxylic acid high-efficiency water reducing agent, naphthalene water reducing agent and melamine water reducing agent. Generally, the water reducing agent may be contained in the cement mortar of the present invention in an amount ranging from 0.10 to 0.30wt%. In certain specific embodiments, the present invention employs a polycarboxylic acid superplasticizer in an amount ranging from 0.10 to 0.20 weight percent.

The cement mortar of the invention may further contain one or more of quartz powder or heavy calcium powder, an expanding agent, anti-cracking fibers, a thickening agent, a setting accelerator, a retarder and a thixotropic agent.

The content of quartz powder or triple superphosphate powder suitable for use in the present invention in the cement mortar of the present invention may be in the range of 0 to 18wt%, for example 1.0 to 10wt%, 2.0 to 10wt%, or 8.0 to 18wt%. The particle size is not particularly limited and can be determined according to the specific use of the mortar of the present invention.

The expanding agent suitable for use in the present invention includes, but is not limited to, calcium thioaluminate type expanding agents, calcium oxide type expanding agents or a combination thereof, and the content thereof in the cement mortar of the present invention may be in the range of 0 to 1.8wt%. For example 0-0.5wt%, 0-1.0wt% or 1.0-1.8wt%.

The anti-crack fiber suitable for the present invention includes, but is not limited to, one or more of glass fiber, polypropylene monofilament fiber and steel fiber, and the content thereof in the cement mortar of the present invention may be in the range of 0 to 0.95 wt%. For example 0 to 0.50wt% or 0.20 to 0.90wt%.

Thickeners suitable for use in the present invention include, but are not limited to, cellulose ethers, starch ethers, or combinations thereof, which may be present in the cement mortars of the present invention in an amount ranging from 0 to 0.045wt%, for example 0 to 0.03wt%.

Accelerators suitable for use in the present invention include, but are not limited to, lithium carbonate, lithium sulfate, calcium formate, or combinations thereof. Typically, the setting accelerator is present in an amount of 0 to 0.08wt%, such as 0.02 to 0.06wt%. In certain embodiments, the cement mortars of the invention contain an accelerator in an amount of 0.02 to 0.05wt%.

Retarders suitable for use in the present invention include, but are not limited to, citric acid, tartaric acid, sodium citrate, or mixtures thereof. Typically, the retarder is present in an amount of 0 to 0.15wt%, such as 0.05 to 0.10wt% or 0.07 to 0.15wt%. In certain embodiments, the cement mortars of the invention contain a retarder in an amount within the range of 0.07-0.15wt%, preferably 0.07-0.12wt%.

Thixotropic agents suitable for use in the present invention include, but are not limited to diutan, which may be present in the cement mortar of the present invention in an amount ranging from 0 to 0.009wt%. For example 0 to 0.008 wt.% or 0.001 to 0.009 wt.%.

The cement mortar can be prepared by adopting the normal-temperature self-crosslinking water-based epoxy resin modified cement-based mortar bi-component material, preferably, 10-25 parts by weight of the component A is used per 100 parts by weight of the component B, and preferably, 15-20 parts by weight of the component A is used per 100 parts by weight of the component B. In some embodiments, 17 to 18 parts by weight of the A component is used per 100 parts by weight of the B component.

The cement mortar of the present invention can be obtained by simply mixing the A component and the B component. An appropriate amount of water may be added as needed.

The mortar material of the invention has the following characteristics:

(1) Has excellent mechanical strength, the 28-day compressive strength of the material can reach more than 60MPa, and the 28-day flexural strength of the material can reach more than 12 MPa.

(2) Has good impact toughness and cracking resistance, and has no cracking and spalling on the surface in a 28-day impact test (1 kg/1000mm,2mm thick test piece).

(3) Has the characteristic of quick hardening, has 24-hour strength and compressive strength of more than 25MPa, and is suitable for quick construction.

(4) The low-temperature environment strength is fast to develop, the compression strength of 24h and 3 days at 5 ℃ respectively reaches 8MPa and 20MPa, and the curing is carried out within 24h, so that the high-strength concrete is suitable for construction in winter and underground engineering.

(5) The volume is stable, the long-term drying shrinkage value is lower than 0.15%, the long-term soaking expansion value is lower than 0.05%, and cracking and shelling caused by dry-wet circulation can be effectively resisted.

(6) The water permeability of the concrete is good, the water permeability of 2h and 24h is respectively below 0.1mL and 0.4mL (JG/T210-2018 method), and the concrete is suitable for repairing and protecting waterproof and concrete surfaces.

(7) The waterproof performance is excellent, the waterproof adhesive can be effectively and firmly bonded with a cement concrete base layer for a long time in a humid environment, and the defect that high polymer resins such as SBR, VAE, SA and the like have insufficient waterproof performance is overcome.

(8) Has high wear resistance with a wear resistance value lower than 400mm ³ (JC/T985-2017 method) is suitable for the application with high wear resistance requirements.

(9) Can resist freeze-thaw cycle, and is suitable for long-term service under extreme low temperature environment (such as environment at-35 deg.C).

(10) Has the A-level fire-proof characteristic and is suitable for occasions with high fire-proof grade requirements.

(11) Has the characteristic of environmental safety, and does not release toxic and harmful substances in the construction and use processes.

The present invention will be illustrated below by way of specific examples. It should be understood that these examples are illustrative only and are not intended to limit the scope of the present invention. Some of the materials used in the examples were:

other materials used in the examples are commercially available materials conventional in the art.

COMPARATIVE EXAMPLE 1 (ordinary silicate cement mortar)

Weighing and mixing 42.5 parts of ordinary portland cement PO, 0.1-0.3mm of quartz sand, 0.3-0.6mm of quartz sand, an anti-settling agent, a polycarboxylic acid high-efficiency water reducing agent and a defoaming agent according to the formula shown in the following table 1 to obtain a powdery solid material component B; 100 parts by weight of the component B and 14 parts by weight of water are mixed by a dry mixer to prepare the mortar.

TABLE 1

Composition (I)	Weight percent of
		Liquid fraction	14.0
Water (W)	14.0
		Powdered solid fraction	100.0
Ordinary portland cement PO42.5	41.5
		Quartz sand (0.1-0.3 mm)	49.69
Quartz sand (0.3-0.6 mm)	8.5
		Anti-settling agent	0.01
Polycarboxylic acid high-efficiency water reducing agent	0.15
		Defoaming agent	0.15

Example 1 (aqueous epoxy resin-modified ordinary portland cement mortar)

Weighing epoxy resin emulsion (EEW =550 solid content, about 40wt% solid content), defoaming agent and water according to the formula shown in the following table 2, and mixing to obtain a liquid A component; continuously weighing ordinary portland cement PO42.5, quartz sand (0.1-0.3 mm), quartz sand (0.3-0.6 mm), anti-settling agent, polycarboxylic acid high-efficiency water reducing agent and defoaming agent, and mixing to obtain powdery solid material component B; 17.65 parts by weight of the component A and 100 parts by weight of the component B are mixed by a dry mixer to prepare the mortar.

TABLE 2

Test example 1

Comparative example 1 and example 1 were tested according to the test method specified in JC/T985-2017 standard, in which test pieces molded for 24 hours in the Water immersion treatment tensile bond Strength project were subjected to a water immersion treatment for 28 days (23 ℃), and the barrier properties were tested according to the method specified in the JG/T210-2018 method standard. The results are shown in Table 3.

TABLE 3

COMPARATIVE EXAMPLE 2 (white portland cement mortar)

Weighing 52.5 parts of white portland cement PW, 0.1-0.3mm quartz sand, 0.3-0.6mm quartz sand, an anti-settling agent, a polycarboxylic acid high-efficiency water reducing agent and a defoaming agent according to the formula shown in the following table 4, and mixing to obtain a powdery solid material component B; 100 parts by weight of the component B and 14 parts by weight of water were mixed, and the mixture was mixed by a dry mixer to prepare mortar.

TABLE 4

Composition (I)	Weight percent of
		Liquid fraction	14.0
Water (W)	14.0
		Powdered solid fraction	100.0
White portland cement PW52.5	41.5
		Quartz sand (0.1-0.3 mm)	49.69
Quartz sand (0.3-0.6 mm)	8.5
		Anti-settling agent	0.01
Polycarboxylic acid high-efficiency water reducing agent	0.15
		Defoaming agent	0.15

Comparative example 3 (conventional aqueous epoxy resin-modified white portland cement mortar)

Weighing epoxy resin emulsion (EEW =190, ancarez AR 468 in solid content) as a liquid component A, a curing agent, a defoaming agent and water according to a formula shown in the following table 5, and mixing to obtain a liquid component B; continuously weighing white portland cement, quartz sand, an anti-settling agent, a polycarboxylic acid high-efficiency water reducing agent and a defoaming agent, and mixing to obtain a powdery solid material; 6.0 parts by weight of the A component, 13.1 parts by weight of the B component and 100 parts by weight of the powdery solid material were mixed and mixed by a dry mixer to prepare mortar.

TABLE 5

Composition (I)	Weight percent of
		Liquid fraction (A component)	6.0
Epoxy resin emulsion (solid EEW = 190)	6.0
		Liquid fraction (B component)	13.1
Curing agent	5.0
		Defoaming agent	0.1
Water (I)	8.0
		Powdery solid component	100.0
White portland cement PW52.5	36.5
		Quartz sand (0.1-0.3 mm)	53.7
Quartz sand (0.3-0.6 mm)	9.44
		Anti-settling agent	0.01
Polycarboxylic acid high-efficiency water reducing agent	0.20
		Defoaming agent	0.15

Example 2 (aqueous epoxy resin modified white portland cement mortar)

Weighing epoxy resin emulsion (EEW =550 solid content, about 40wt% solid content), defoaming agent and water according to the formula shown in the following table 6, and mixing to obtain a liquid A component; continuously weighing white portland cement PW52.5, quartz sand (0.1-0.3 mm), quartz sand (0.3-0.6 mm), an anti-settling agent, a polycarboxylic acid high-efficiency water reducing agent and a defoaming agent, and mixing to obtain a powdery solid material component B; 17.65 parts by weight of the component A and 100 parts by weight of the component B are mixed by a dry mixer to prepare the mortar.

TABLE 6

Test example 2

Comparative example 2 and example 2 were tested according to the test method specified in JC/T985-2017 standard, in which test pieces molded for 24 hours in the water immersion treatment tensile bond strength item were subjected to water immersion treatment for 28 days (23 ℃), the barrier properties were tested according to the method specified in JG/T210-2018 standard, and the freeze-thaw resistance was tested according to the method specified in JGJ/T70-2009 standard, for 25 freeze-thaw cycles. The results are shown in Table 7.

TABLE 7

COMPARATIVE EXAMPLE 4 (Gaoberit sulphoaluminate cement mortar)

Weighing high belite sulphoaluminate cement, quartz sand (0.1-0.3 mm), quartz sand (0.3-0.6 mm), an anti-settling agent, a polycarboxylic acid high-efficiency water reducing agent, a coagulant, a retarder and a defoaming agent according to the formula shown in the following table 8, and mixing to obtain a powdery solid material component B; 100 parts by weight of the component B and 14 parts by weight of water are mixed by a dry mixer to prepare the mortar.

TABLE 8

Composition (I)	Weight percent of
		Liquid fraction	14.0
Water (I)	14.0
		Powdered solid fraction	100.0
High belite sulphoaluminate cement	36.0
		Quartz sand (0.1-0.3 mm)	43.7
Quartz sand (0.3-0.6 mm)	19.79
		Anti-settling agent	0.01
Polycarboxylic acid high-efficiency water reducing agent	0.20
		Setting accelerator	0.05
Retarder	0.10
		Defoaming agent	0.15

Example 3 (waterborne epoxy resin modified high belite sulphoaluminate cement mortar)

Weighing epoxy resin emulsion (EEW =550 solid content, about 40wt% solid content), defoaming agent and water according to the formula shown in the following table 9, and mixing to obtain a liquid A component; continuously weighing high belite sulphoaluminate cement, quartz sand (0.1-0.3 mm), quartz sand (0.3-0.6 mm), anti-settling agent, polycarboxylic acid high-efficiency water reducing agent, coagulant, retarder and defoaming agent, and mixing to obtain a powdery solid material component B; 18.0 parts by weight of the component A and 100 parts by weight of the component B are mixed by a dry mixer to prepare the mortar.

TABLE 9

Test example 3

Comparative example 3 and example 3 were tested according to the test method specified in the JC/T985-2017 standard, in which test pieces molded for 24 hours in the Water immersion treatment tensile bond Strength project were subjected to water immersion treatment for 28 days (23 ℃), and the barrier properties were tested according to the method specified in the JG/T210-2018 standard. The results are shown in Table 10.

Watch 10

Example 4 (aqueous epoxy resin modified ordinary portland cement mortar)

Weighing epoxy resin emulsion (EEW =300 solid content, about 58wt% solid content), defoaming agent and water according to the formula shown in the following table 11, and mixing to obtain a liquid A component; continuously weighing ordinary portland cement PO42.5, quartz sand (0.1-0.3 mm), quartz sand (0.3-0.6 mm), anti-settling agent, polycarboxylic acid high-efficiency water reducing agent and defoaming agent, and mixing to obtain powdery solid material component B; 17.65 parts by weight of the component A and 100 parts by weight of the component B are mixed by a dry mixer to prepare the mortar.

TABLE 11

Composition (I)	Weight percent of
		Composition of liquid fraction	17.65
Epoxy resin emulsion (solid EEW = 300)	7.06
		Defoaming agent	0.12
Water (W)	10.47
		Powdery solid component	100.0
Ordinary portland cement PO42.5	36.5
		Quartz sand (0.1-0.3 mm)	53.7
Quartz sand (0.3-0.6 mm)	9.44
		Anti-settling agent	0.01
Polycarboxylic acid high-efficiency water reducing agent	0.20
		Defoaming agent	0.15

Example 5 (aqueous epoxy resin-modified ordinary portland cement mortar)

Weighing epoxy resin emulsion (EEW =400 solid content, solid content of about 50 wt%), defoamer and water according to the formula shown in the following table 12, and mixing to obtain a liquid A component; continuously weighing ordinary portland cement PO42.5, quartz sand (0.1-0.3 mm), quartz sand (0.3-0.6 mm), anti-settling agent, polycarboxylic acid high-efficiency water reducing agent and defoaming agent, and mixing to obtain powdery solid material component B; 17.65 parts by weight of the component A and 100 parts by weight of the component B are mixed by a dry mixer to prepare the mortar.

TABLE 12

Composition (A)	Weight percent of
		Liquid fraction	17.65
Epoxy resin emulsion (solid EEW = 400)	7.06
		Defoaming agent	0.12
Water (I)	10.47
		Powdered solid fraction	100.0
Ordinary portland cement PO42.5	36.5
		Quartz sand (0.1-0.3 mm)	53.7
Quartz sand (0.3-0.6 mm)	9.44
		Anti-settling agent	0.01
Polycarboxylic acid high-efficiency water reducing agent	0.20
		Defoaming agent	0.15

Test example 4

Examples 4 and 5 were tested according to the test method specified in JC/T985-2017 standard, in which test pieces molded for 24 hours in the Water immersion treatment tensile bond Strength item were subjected to a water immersion treatment for 28 days (23 ℃). The results are shown in Table 13.

Watch 13

Claims

1. The normal-temperature self-crosslinking water-based epoxy resin modified cement mortar is characterized by comprising 5.0-9.0wt% of normal-temperature self-crosslinking water-based epoxy resin emulsion, 0.10-1.0wt% of defoaming agent, 20-40wt% of cement, 40-65wt% of sand, 0.001-0.01wt% of anti-settling agent, 0.10-0.30wt% of water reducing agent and the balance of water, wherein the total weight of the cement mortar is calculated; wherein the normal-temperature self-crosslinking water-based epoxy resin is bisphenol A epoxy resin with the epoxy equivalent of 400-550, and the cement mortar does not contain a curing agent; the cement mortar is suitable for construction in winter and underground engineering, the 24-hour compressive strength is more than 25MPa, the 28-day compressive strength is more than 60MPa, the 28-day rupture strength is more than 12MPa, the water permeability of 2 hours and 24 hours is respectively below 0.1mL and 0.4mL according to a JG/T210-2018 test method, and the surface of a 2mm thick test piece is free of cracking and peeling when an impact test is carried out on 1kg/1000mm in 28 days.

2. The room temperature self-crosslinking aqueous epoxy resin modified cement mortar of claim 1, wherein the cement mortar contains 6.0 to 7.0wt% of the room temperature self-crosslinking aqueous epoxy resin emulsion based on the total weight of the cement mortar.

3. The room temperature self-crosslinking aqueous epoxy resin-modified cement mortar of claim 1, wherein the cement mortar contains 0.10 to 0.50wt% of an antifoaming agent, based on the total weight of the cement mortar.

4. The room-temperature self-crosslinking aqueous epoxy resin-modified cement mortar of claim 1, which contains 0.10 to 0.30wt% of the defoamer, based on the total weight of the cement mortar.

5. The room-temperature self-crosslinking aqueous epoxy resin-modified cement mortar of claim 1, wherein the cement mortar contains 25 to 35% by weight of cement based on the total weight of the cement mortar.

6. The room-temperature self-crosslinking aqueous epoxy resin-modified cement mortar of claim 1, wherein the cement mortar contains 30 to 35% by weight of cement based on the total weight of the cement mortar.

7. The room-temperature self-crosslinking aqueous epoxy resin-modified cement mortar as claimed in claim 1, wherein the cement mortar contains 45 to 65% by weight of sand based on the total weight of the cement mortar.

8. The room-temperature self-crosslinking aqueous epoxy resin-modified cement mortar as claimed in claim 1, wherein the cement mortar contains 50 to 60% by weight of sand based on the total weight of the cement mortar.

9. The room temperature self-crosslinking aqueous epoxy resin-modified cement mortar of claim 1, wherein the cement mortar contains 0.005 to 0.01wt% of the anti-settling agent, based on the total weight of the cement mortar.

10. The room-temperature self-crosslinking aqueous epoxy resin-modified cement mortar of claim 1, wherein the cement mortar contains 0.10 to 0.20wt% of the water reducing agent based on the total weight of the cement mortar.

11. The room-temperature self-crosslinking waterborne epoxy resin modified cement mortar of claim 1, wherein the content of the room-temperature self-crosslinking waterborne epoxy resin in the room-temperature self-crosslinking waterborne epoxy resin emulsion is 40-60wt%.

12. The room-temperature self-crosslinking water-based epoxy resin-modified cement mortar of claim 1, wherein:

the defoamer is selected from mineral oil type defoamers, non-mineral oil type defoamers or a combination;

the cement is selected from one or more of ordinary portland cement, white portland cement, high belite sulphoaluminate cement and aluminate cement;

the sand and stone is calcium sand, quartz sand or the combination thereof;

the anti-settling agent is selected from one or more of fumed silica, organic modified bentonite and attapulgite;

the water reducing agent is selected from one or more of polycarboxylic acid high-efficiency water reducing agent, naphthalene water reducing agent and melamine water reducing agent.

13. The normal-temperature self-crosslinking water-based epoxy resin modified cement mortar is characterized by comprising a component A and a component B of a normal-temperature self-crosslinking water-based epoxy resin modified cement-based mortar bi-component material, or prepared by mixing the component A and the component B of the normal-temperature self-crosslinking water-based epoxy resin modified cement-based mortar bi-component material and optionally adding a proper amount of water; the cement mortar is suitable for construction in winter and underground engineering, the 24-hour compressive strength is more than 25MPa, the 28-day compressive strength is more than 60MPa, the 28-day rupture strength is more than 12MPa, the water permeability of 2 hours and 24 hours is respectively below 0.1mL and 0.4mL according to a JG/T210-2018 test method, and the surface of a 2mm thick test piece is free of cracking and peeling when an impact test is carried out at 1kg/1000mm in 28 days;

wherein the component A comprises 12-30wt% of normal-temperature self-crosslinking water-based epoxy resin, optionally 0.10-1.0wt% of defoaming agent and the balance of water based on the total weight of the component A; wherein the normal-temperature self-crosslinking water-based epoxy resin is bisphenol A epoxy resin with the epoxy equivalent of 400-550;

the component B contains cement, sand, an anti-settling agent, a water reducing agent and a defoaming agent;

wherein the A component and the B component are packaged independently, and the two-component material does not contain a curing agent.

14. The room temperature self-crosslinking waterborne epoxy resin modified cement mortar of claim 13, wherein the component A contains 15-25wt% of the room temperature self-crosslinking waterborne epoxy resin based on the total weight of the component A.

15. The room-temperature self-crosslinking waterborne epoxy resin-modified cement mortar of claim 13, wherein the room-temperature self-crosslinking waterborne epoxy resin is provided in the form of an emulsion, and the component A comprises a room-temperature self-crosslinking waterborne epoxy resin emulsion, water and optionally an antifoaming agent, wherein the content of the room-temperature self-crosslinking waterborne epoxy resin emulsion is 30-50wt% based on the total weight of the component A.

16. The room-temperature self-crosslinking aqueous epoxy resin-modified cement mortar of claim 15, wherein the content of the room-temperature self-crosslinking aqueous epoxy resin emulsion is 35 to 45wt% based on the total weight of the component a.

17. The room-temperature self-crosslinking aqueous epoxy resin-modified cement mortar of claim 15, wherein the content of the room-temperature self-crosslinking aqueous epoxy resin in the room-temperature self-crosslinking aqueous epoxy resin emulsion is 40 to 60wt%.

18. The room-temperature self-crosslinking waterborne epoxy resin-modified cement mortar of claim 15, wherein the component a comprises: 35-45wt% of the normal-temperature self-crosslinking water-based epoxy resin emulsion, 0.50-0.80wt% of a defoaming agent and the balance of water, wherein the normal-temperature self-crosslinking water-based epoxy resin is bisphenol A epoxy resin emulsion with the epoxy equivalent of 400-550.

19. The room-temperature self-crosslinking water-based epoxy resin modified cement mortar of claim 15, wherein the component a comprises: 35-45wt% of the normal-temperature self-crosslinking water-based epoxy resin emulsion, 0.55-0.80wt% of a defoaming agent and the balance of water, wherein the normal-temperature self-crosslinking water-based epoxy resin is bisphenol A epoxy resin emulsion with the epoxy equivalent of 550.

20. The room-temperature self-crosslinking water-based epoxy resin modified cement mortar of claim 15, wherein the component a comprises: 35-45wt% of the normal-temperature self-crosslinking water-based epoxy resin emulsion, 0.55-0.80wt% of a defoaming agent and the balance of water, wherein the normal-temperature self-crosslinking water-based epoxy resin is bisphenol A epoxy resin emulsion with the epoxy equivalent of 400.

21. The room-temperature self-crosslinking water-based epoxy resin modified cement mortar of claim 13, wherein the component B comprises 20-45wt% of cement, 45-70wt% of sand, 0.005-0.05wt% of anti-settling agent, 0.10-0.30wt% of water reducing agent and 0.05-0.30wt% of defoaming agent, based on the total weight of the component B.

22. The room temperature self-crosslinking aqueous epoxy resin-modified cement mortar of claim 21, wherein the B component contains 30 to 40% by weight of cement, based on the total weight of the B component.

23. The room temperature self-crosslinking aqueous epoxy resin-modified cement mortar of claim 21, wherein the B component contains 35 to 40wt% of cement, based on the total weight of the B component.

24. The room temperature self-crosslinking aqueous epoxy resin-modified cement mortar of claim 21, wherein the B component contains 55 to 70wt% of sand, based on the total weight of the B component.

25. The room temperature self-crosslinking aqueous epoxy resin-modified cement mortar of claim 21, wherein the B component contains 58 to 65wt% of sand, based on the total weight of the B component.

26. The room-temperature self-crosslinking aqueous epoxy resin-modified cement mortar of claim 21, wherein the B component contains 0.005 to 0.02wt% of the anti-settling agent, based on the total weight of the B component.

27. The room temperature self-crosslinking aqueous epoxy resin modified cement mortar of claim 21, wherein the B component contains 0.13 to 0.25wt% of water reducing agent based on the total weight of the B component.

28. The room temperature self-crosslinking aqueous epoxy resin-modified cement mortar of claim 21, wherein the B component contains 0.08 to 0.25wt% of an antifoaming agent, based on the total weight of the B component.

29. The room-temperature self-crosslinking aqueous epoxy resin-modified cement mortar of claim 21, wherein the B-component contains 0.12 to 0.18wt% of the defoamer, based on the total weight of the B-component.

30. The room temperature self-crosslinking waterborne epoxy resin modified cement mortar of claim 13, wherein:

the defoamer is selected from mineral oil type defoamers, non-mineral oil type defoamers or combinations;

the sand and stone is calcium sand, quartz sand or a combination thereof;

31. The room temperature self-crosslinking waterborne epoxy resin modified cement mortar of claim 13, wherein:

the component A also contains pigment or color paste; and/or

The component B also contains one or more of 0-20wt% of quartz powder or heavy calcium powder, 0-2.0wt% of expanding agent, 0-1.0wt% of anti-cracking fiber, 0-0.05wt% of thickening agent, 0-0.10wt% of coagulant, 0-0.20wt% of retarder and 0-0.01wt% of thixotropic agent.

32. The room temperature self-crosslinking waterborne epoxy resin modified cement mortar of claim 31, wherein:

the swelling agent is selected from calcium sulphoaluminate swelling agents, calcium oxide swelling agents or a combination thereof;

the anti-crack fiber is selected from one or more of glass fiber, polypropylene monofilament fiber and steel fiber;

the thickening agent is selected from cellulose ethers, starch ethers, or combinations thereof;

the coagulant is selected from lithium carbonate, lithium sulfate, calcium formate or a combination thereof;

the retarder is selected from citric acid, tartaric acid, sodium citrate or a combination thereof;

the thixotropic agent is diutan.

33. The room-temperature self-crosslinking water-based epoxy resin modified cement mortar of claim 13, wherein the component B comprises, based on the total weight of the component B:

35 to 37 weight percent of ordinary portland cement PO42.5, 50 to 55 weight percent of quartz sand with the grain size of 0.1 to 0.3mm, 8.0 to 10 weight percent of quartz sand with the grain size of 0.3 to 0.6mm, 0.01 to 0.015 weight percent of anti-settling agent, 0.13 to 0.25 weight percent of polycarboxylic acid high-efficiency water reducing agent and 0.10 to 0.18 weight percent of defoaming agent; or

35 to 37 weight percent of white portland cement PW52.5, 50 to 55 weight percent of quartz sand with the particle size of 0.1 to 0.3mm, 8.0 to 10 weight percent of quartz sand with the particle size of 0.3 to 0.6mm, 0.01 to 0.015 weight percent of anti-settling agent, 0.13 to 0.25 weight percent of polycarboxylic acid high-efficiency water reducing agent and 0.10 to 0.18 weight percent of defoaming agent; or

35-38wt% of high belite sulphoaluminate cement, 50-55wt% of quartz sand with the particle size of 0.1-0.3mm, 8.0-10wt% of quartz sand with the particle size of 0.3-0.6mm, 0.01-0.015wt% of anti-settling agent, 0.13-0.25wt% of polycarboxylic acid high efficiency water reducing agent, 0.05-0.08wt% of coagulant, 0.08-0.10wt% of retarder and 0.10-0.18wt% of defoaming agent.

34. The room-temperature self-crosslinking water-based epoxy resin modified cement mortar as claimed in any one of claims 13 to 33, wherein in the bi-component material, the weight ratio of the component A to the component B is 10 to 25:100.

35. the room-temperature self-crosslinking water-based epoxy resin modified cement mortar of claim 34, wherein in the bi-component material, the weight ratio of the component A to the component B is 15-20:100.

36. the room-temperature self-crosslinking water-based epoxy resin modified cement mortar as claimed in claim 34, wherein in the bi-component material, the weight ratio of the component A to the component B is 17-18:100.