CN111234616A - Low-alkalinity waterproof slurry with efforescence resisting function and preparation method thereof - Google Patents
Low-alkalinity waterproof slurry with efforescence resisting function and preparation method thereof Download PDFInfo
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
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- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- C09D109/00—Coating compositions based on homopolymers or copolymers of conjugated diene hydrocarbons
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Abstract
The invention discloses a low-alkalinity waterproof slurry with a whiskering resisting function and a preparation method thereof, wherein the waterproof slurry comprises the following components in parts by weight: (1) liquid material: 15-25 parts of styrene-acrylate copolymer emulsion, 15-25 parts of butadiene-styrene copolymer emulsion, 40-50 parts of water, 0.1-1 part of preservative, 0.5-1.5 parts of antifreeze agent, 0.3-0.8 part of thickening agent and 0.1-1 part of defoaming agent; (2) powder lot: 50-60 parts of sulphoaluminate cement, 20-40 parts of inorganic filler, 0.1-0.5 part of water reducing agent, 0.1-0.5 part of anti-alkali bleeding agent, 0.05-0.15 part of water-retaining agent and 2-5 parts of metakaolin, wherein the weight ratio of the liquid material to the powder material is (8-10): 25. the waterproof slurry is neutral, the material is low in alkalinity, the coating film is free of efflorescence, the sealing performance is good, and the waterproof slurry is an aqueous product, and is environment-friendly, non-toxic, harmless and pollution-free.
Description
Technical Field
The invention relates to the technical field of waterproof materials, and particularly relates to low-alkalinity waterproof slurry with a function of resisting whiskering and a preparation method thereof.
Background
The wall body efflorescence is a common disease of buildings, not only affects the beauty, but also can damage the structure of the buildings and shorten the service life of the buildings. Wall efflorescence refers to the phenomenon: hydroxide radicals generated by hydration of portland cement in the wall are combined with metal ions to form hydroxide, the hydroxide is separated out from the wall along with water vapor and reacts with carbon dioxide in air to form white crystalline calcium carbonate with extremely low solubility, and the white crystalline calcium carbonate is accumulated on the surface area of the wall or forms white stains or jacks up decorative materials on the surface of the wall. In response to this phenomenon, it is a common practice to perform waterproofing treatment on a wall body, mainly for waterproofing on a back water surface, and there are three types of products in the market: 1. polymer cement-based waterproof slurry: the biggest defect of the product is that the coating film is alkaline, and the material can be efflorescent; 2. Epoxy primer: the product has good closure, but has poor adhesion on a wet base surface and smooth surface, so that the subsequent processes are not facilitated; 3. concrete curing agents: the product has relatively poor waterproof performance, strong self-alkalinity and easy efflorescence. The three products have certain defects, and a series of problems caused by wall efflorescence cannot be well solved.
Disclosure of Invention
The invention aims to overcome at least one defect of the prior art and provides the low-alkalinity waterproof slurry with the function of resisting the whiskering, the low-alkalinity waterproof slurry with the function of resisting the whiskering is neutral, the alkalinity of the material is low, the coating film does not whiskering, the sealing performance is good, and the low-alkalinity waterproof slurry is a water-based product, is environment-friendly, nontoxic, harmless and pollution-free.
The invention also aims to provide a preparation method of the low-alkalinity waterproof slurry with the function of resisting the efflorescence.
The technical scheme adopted by the invention is as follows:
a low-alkalinity waterproof slurry with a function of resisting whiskering comprises the following components in parts by weight:
(1) liquid material:
15-25 parts of styrene-acrylate copolymer emulsion;
15-25 parts of butadiene-styrene copolymer emulsion;
40-50 parts of water;
0.1-1 part of preservative;
0.5-1.5 parts of an antifreeze agent;
0.3-0.8 part of thickening agent;
0.1-1 part of defoaming agent;
(2) powder lot:
50-60 parts of sulphoaluminate cement;
20-40 parts of an inorganic filler;
0.1-0.5 part of a water reducing agent;
0.1-0.5 part of an anti-flooding agent;
0.05-0.15 part of water-retaining agent;
2-5 parts of metakaolin;
the weight ratio of the liquid material to the powder material is (8-10): 25;
the styrene-acrylate copolymer emulsion is modified by a monomer containing at least one functional group of epoxy group, amino group, amido group, carboxyl group and organosilicon group, the solid content is 30-60 percent, and the glass transition temperature is-5-15 ℃;
the butadiene-styrene copolymer emulsion has a styrene content of 23-25% and a glass transition temperature of 0-10 ℃;
the sulphoaluminate cement is low-alkalinity sulphoaluminate cement with the strength grade of 42.5. .
The invention uses the sulphoaluminate cement with extremely low alkalinity as the inorganic adhesive material, greatly reduces the alkalinity of the material, and finally achieves the purpose that the waterproof layer does not generate efflorescence on the basis of adding the anti-efflorescence agent. The styrene-acrylate copolymer emulsion is a film forming material of waterproof slurry, is used for providing impermeability and flexibility of the waterproof slurry, and improves the adhesive force between a waterproof coating and a base surface, so that a coating film has the characteristics of high strength, compactness, water resistance and alkali resistance; the butadiene-styrene copolymer is a film forming material of the waterproof slurry, and has outstanding contribution to the impermeability and adhesive force of a coating film, so that the coating film can resist certain water pressure and the pressure of saline-alkali growth. The sulphoaluminate cement has the function of providing strength for the waterproof coating film, so that the waterproof coating film has the characteristics of water resistance, acid-base salt resistance and strong adhesive force to a base material. The invention further adopts the specific styrene-acrylate copolymer emulsion and the butadiene-styrene copolymer emulsion to compound, thereby improving the compactness of the coating and having high impermeability strength. And active metakaolin is added, so that the early strength of the coating is improved, and the impermeability of the back water surface is stronger. The product is especially suitable for the water-proof treatment of the wall body with high salinity and high backwater pressure.
Preferably, the styrene-acrylate copolymer emulsion is BLJ-6319 from shineika, shanghai.
Preferably, the butadiene-styrene copolymer emulsion is Lipaton SB 29Y57 from shanghai tma company.
Preferably, the preservative is isothiazolinone and/or 2, 2-dibromopropionamide. The preservative prevents the degradation of the interfacial agent by microorganisms, and can solve a series of problems of mildew, deterioration, fermentation, odor, emulsion breaking and the like of the interfacial agent caused by bacterial infection.
Preferably, the antifreeze agent is one or more of ethylene glycol, propylene glycol and hexylene glycol. The antifreeze mainly has the functions of lowering the freezing point of the interface agent, improving the low-temperature storage stability of the interface agent, adjusting the drying speed of the interface agent during construction and improving the permeability of a coating.
Preferably, the thickening agent is one or more of cellulose ethers, polyacrylates, association polyurethanes and inorganic thickening agents. Thickeners are used to prevent the pigment from settling.
Preferably, the defoamer is a mineral oil and/or silicone based defoamer. The defoaming agent is used for eliminating or reducing bubbles of the interfacial agent in the production and construction processes.
Preferably, the inorganic filler is one or more of quartz sand, quartz powder, talcum powder, heavy calcium carbonate, light calcium carbonate and calcined kaolin. The main function of the inorganic filler is to provide a skeleton for the tacky material of the coating.
Preferably, the water reducing agent is one or more of lignosulphonates, polycyclic aromatic salts, water-soluble resin sulfonates and polycarboxylate. The water reducing agent is used for adjusting the viscosity of the slurry.
Preferably, the anti-alkali-efflorescence agent is one or more of organic silicon hydrophobic powder, micro silicon powder, fly ash, an expanding agent and a water reducing agent. The anti-whiskering agent mainly has the functions of reducing the water content of the cement material, inhibiting the precipitation of free calcium hydroxide, increasing the compactness of the cement material and preventing the water from entering, thereby achieving the anti-whiskering effect.
Preferably, the water-retaining agent is one or more of cellulose ethers, bentonite, attapulgite and xanthan gum. The water-retaining agent is used for adjusting the viscosity of the slurry and prolonging the construction time.
Metakaolin is a high-activity mineral admixture, is amorphous aluminum silicate formed by low-temperature calcination of superfine kaolin, has high pozzolanic activity, and mainly has the functions of improving the early strength of a waterproof layer and preventing the waterproof layer from generating a whiskering phenomenon in the curing process.
The preparation method of the low-alkalinity waterproof slurry with the efforescence resisting function comprises the following steps:
liquid material preparation:
(1) weighing the styrene-acrylate copolymer emulsion and the butadiene-styrene copolymer emulsion, putting into a stirring kettle, and starting low-speed stirring at the stirring speed of 600-800 r/min;
(2) adding the preservative, the antifreeze and the defoamer into a stirring kettle while stirring, and stirring for 3-8 minutes at a speed of 600-800 r/min;
(3) adding water accounting for 50-90% of the total amount of the formula, and continuously stirring for 3-8 minutes;
(4) premixing the thickening agent and the balance of water, putting the mixture into a dispersion kettle while stirring, and stirring for 10-30 minutes at the speed of 1000r/min of 800-;
(5) after the central control detection is qualified, filtering, discharging and packaging for later use;
preparing powder:
(1) weighing sulphoaluminate cement and inorganic filler, putting into a stirring kettle, and starting low-speed stirring at the stirring speed of 50-80 r/min;
(2) accurately weighing the water reducing agent, the alkali-efflorescence resistant agent, the water-retaining agent and the metakaolin respectively, feeding the materials from a master batch feeding port, and stirring for 10-30 minutes;
when the powder material is used, the liquid material and the powder material are mixed according to the weight ratio (8-10): 25, mixing, stirring uniformly, and constructing.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention uses the sulpho-aluminium cement with extremely low alkalinity as the inorganic adhesive material, thereby greatly reducing the alkalinity of the material, and finally achieving the purpose that the waterproof layer does not generate efflorescence on the basis of adding the anti-efflorescence agent;
(2) according to the invention, the specific styrene-acrylate copolymer emulsion and the butadiene-styrene copolymer emulsion are compounded, so that the compactness of the coating is improved, and the impermeability strength is high; the metakaolin with activity is added, so that the early strength of the coating is improved, and the impermeability of the back water surface is stronger;
(3) the low-alkalinity waterproof slurry with the function of resisting the efflorescence is an aqueous product, and is environment-friendly, non-toxic, harmless and pollution-free.
Drawings
FIG. 1 is a graph showing the test results of the saltpetering performance of example 1; FIG. 1 is a graph showing the test results of the saltpetering performance of comparative example 3 on the right.
Detailed Description
The examples of the present invention are provided for illustrative purposes only and are not to be construed as limiting the invention.
The following examples used the following sources of raw materials:
styrene-acrylate copolymer emulsion: BLJ-6319 from shanghai buliba corporation.
Butadiene-styrene copolymer emulsion: lipaton SB 29Y57 from Shanghai Xinte Ma.
Sulphoaluminate cement: low alkalinity sulphoaluminate cement with a strength grade of 42.5.
Other raw materials which are not particularly described are all common commercial products.
Example 1
A low-alkalinity waterproof slurry with a function of resisting whiskering comprises the following components in parts by weight:
(1) liquid material:
23 parts of styrene-acrylate copolymer emulsion;
25 parts of butadiene-styrene copolymer emulsion;
50 parts of water;
0.4 part of 2, 2-dibromo-propionamide;
0.8 part of propylene glycol;
0.5 part of thickening agent;
0.3 part of defoaming agent;
(2) powder lot:
56.5 parts of sulphoaluminate cement;
39 parts of talcum powder;
0.3 part of lignosulfonate;
0.4 part of an anti-efflorescence agent;
0.1 part of bentonite;
3.7 parts of metakaolin.
The preparation process of the low-alkalinity waterproof slurry with the efforescence resisting function comprises the following steps:
liquid material preparation:
(1) weighing the styrene-acrylate copolymer emulsion and the butadiene-styrene copolymer emulsion, putting into a stirring kettle, and starting low-speed stirring at the stirring speed of 600-800 r/min;
(2) adding the preservative, the antifreeze and the defoamer into a stirring kettle while stirring, and stirring for 5 minutes at the speed of 600-800 r/min;
(3) adding water accounting for 50-90% of the total amount of the formula, and continuously stirring for 5 minutes;
(4) premixing the thickening agent and the balance of water, putting the mixture into a dispersion kettle while stirring, and stirring for 20 minutes at a speed of 800-1000 r/min;
(5) after the central control detection is qualified, filtering, discharging and packaging for later use;
preparing powder:
(1) weighing sulphoaluminate cement and inorganic filler, putting into a stirring kettle, and starting low-speed stirring at the stirring speed of 60 r/min;
(2) and (3) accurately weighing the water reducing agent, the alkali-efflorescence resisting agent, the water-retaining agent and the metakaolin respectively, then feeding from a master batch feeding port, and stirring for 20 minutes.
When the brush is used, the liquid material and the powder material are mixed according to the weight ratio of 9:25, and are uniformly stirred, and then the bristle brush is used for construction.
Example 2
A low-alkalinity waterproof slurry with a function of resisting whiskering comprises the following components in parts by weight:
(1) liquid material:
16 parts of styrene-acrylate copolymer emulsion;
25 parts of butadiene-styrene copolymer emulsion;
55 parts of water;
1 part of 2, 2-dibromopropionamide;
1.2 parts of propylene glycol;
0.8 part of thickening agent;
1.0 part of defoaming agent;
(2) powder lot:
59 parts of sulphoaluminate cement;
36 parts of talcum powder;
0.15 part of lignosulfonate;
0.2 part of an anti-efflorescence agent;
0.05 part of bentonite;
4.6 parts of metakaolin.
The preparation method of the low-alkalinity waterproof slurry with the efforescence resisting function is basically the same as that of the embodiment 1, and the description is omitted here. When the brush is used, the liquid material and the powder material are mixed according to the weight ratio of 9:25, and are uniformly stirred, and then the bristle brush is used for construction.
Example 3
A low-alkalinity waterproof slurry with a function of resisting whiskering comprises the following components in parts by weight:
(1) liquid material:
25 parts of styrene-acrylate copolymer emulsion;
23.5 parts of butadiene-styrene copolymer emulsion;
50 parts of water;
0.2 part of 2, 2-dibromo-propionamide;
0.5 part of propylene glycol;
0.3 part of thickening agent;
0.5 part of defoaming agent;
(2) powder lot:
60 parts of sulphoaluminate cement;
34 parts of talcum powder;
0.4 part of lignosulfonate;
0.5 part of an anti-efflorescence agent;
0.1 part of bentonite;
5.0 parts of metakaolin;
the preparation method of the low-alkalinity waterproof slurry with the efforescence resisting function is basically the same as that of the embodiment 1, and the description is omitted here. When the brush is used, the liquid material and the powder material are mixed according to the weight ratio of 8:25, and are uniformly stirred, and then the bristle brush is used for construction.
Example 4
A low-alkalinity waterproof slurry with a function of resisting whiskering comprises the following components in parts by weight:
(1) liquid material:
25 parts of styrene-acrylate copolymer emulsion;
16 parts of butadiene-styrene copolymer emulsion;
55 parts of water;
0.9 part of 2, 2-dibromo-propionamide;
1.5 parts of propylene glycol;
0.6 part of thickening agent;
1.0 part of defoaming agent;
(2) powder lot:
54 parts of sulphoaluminate cement;
40 parts of quartz sand;
0.5 part of lignosulfonate;
0.5 part of an anti-efflorescence agent;
0.1 part of xanthan gum;
4.9 parts of metakaolin;
the preparation method of the low-alkalinity waterproof slurry with the efforescence resisting function is basically the same as that of the embodiment 1, and the description is omitted here. When the brush is used, the liquid material and the powder material are mixed according to the weight ratio of 10:25, and are uniformly stirred, and then the bristle brush is used for construction.
Comparative example 1
A waterproof paste having substantially the same composition and preparation method as in example 1 except that in comparative example 1, the byloniferous YS-8202 was used instead of the BLJ-6319 in example 1.
Comparative example 2
A waterproof slurry having substantially the same composition and preparation method as in example 1 except that in comparative example 2 Styrofan ECO 7623 is used instead of Lipaton SB 29Y57 in example 1.
Comparative example 3
A waterproof slurry having substantially the same composition and preparation method as in example 1 except that in this comparative example 3 ordinary portland cement P.O 42.5.5R was used instead of the sulphoaluminate cement in example 1.
The waterproof pastes of examples 1 to 4, comparative example 1, comparative example 2 and comparative example 3 were subjected to a performance test, wherein the alkali efflorescence resistance performance test method was as follows: 1. the manufacturing method of the cement column for testing comprises the following steps: according to the standard sand: uniformly mixing cement in a ratio of 3:1, adding a small amount of water (the surface of the mortar is free from open water and can be clewed into a ball by hands), preparing a hollow cylindrical model, curing for 7 days under standard conditions, and adhering a watertight bottom plate at the bottom by using a sealant for later use; 2. preparation of a test piece: brushing waterproof slurry on the outer surface of the cement column, brushing the waterproof slurry for two to three times, wherein the thickness of the coating is about 1.5mm, and maintaining for 7d under standard conditions; 3. and (3) testing: adding a reducing solution (adding calcium hydroxide into a 1% sodium hydroxide solution until the calcium hydroxide is in a saturated state) into the cement mortar column after the waterproof coating is coated, continuously maintaining under standard conditions, keeping the liquid level height in the cement mortar column to be about 10cm, and observing whether the surface of the cement column is whiskered.
The whitening substance is precipitated on the surface of the cement columns of the comparative examples 1 to 3, and the whitening phenomenon occurs, so that the waterproof slurry of the comparative example does not have the function of resisting the efflorescence and has poor efflorescence resisting effect. Wherein the test patterns of the whiskering property of example 1 and comparative example 3 are shown in the left and right panels of FIG. 1, respectively.
Other performance tests are carried out according to the index requirements of a product-executed test standard JC/T2090-2011I type, and specific results are shown in a table 1.
TABLE 1
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.
Claims (9)
1. The low-alkalinity waterproof slurry with the function of resisting the efflorescence is characterized by comprising the following components in parts by weight:
(1) liquid material:
15-25 parts of styrene-acrylate copolymer emulsion;
15-25 parts of butadiene-styrene copolymer emulsion;
40-50 parts of water;
0.1-1 part of preservative;
0.5-1.5 parts of an antifreeze agent;
0.3-0.8 part of thickening agent;
0.1-1 part of defoaming agent;
(2) powder lot:
50-60 parts of sulphoaluminate cement;
20-40 parts of an inorganic filler;
0.1-0.5 part of a water reducing agent;
0.1-0.5 part of an anti-flooding agent;
0.05-0.15 part of water-retaining agent;
2-5 parts of metakaolin;
the weight ratio of the liquid material to the powder material is (8-10): 25;
the styrene-acrylate copolymer emulsion is modified by a monomer containing at least one functional group of epoxy group, amino group, amido group, carboxyl group and organosilicon group, the solid content is 30-60 percent, and the glass transition temperature is-5-15 ℃;
the solid content of the styrene content of the butadiene-styrene copolymer emulsion is 23-25%, and the glass transition temperature is 0-10 ℃;
the sulphoaluminate cement is low-alkalinity sulphoaluminate cement with the strength grade of 42.5.
2. The low-alkali waterproof slurry having the function of resisting the efflorescence of claim 1, wherein the preservative is isothiazolinone and/or 2, 2-dibromopropionamide.
3. The low-alkali waterproof slurry with the function of resisting the efflorescence of claim 1, wherein the antifreeze is one or more of ethylene glycol, propylene glycol and hexylene glycol.
4. The low-alkali waterproof slurry having the anti-efflorescence function according to claim 1, wherein the thickener is one or more of cellulose ethers, polyacrylates, associative polyurethanes, inorganic thickeners.
5. The low-alkalinity water-proofing slurry having a function of resisting efflorescence of claim 1, wherein the defoaming agent is a mineral oil-based and/or silicone-based defoaming agent.
6. The low-alkalinity waterproof slurry with the function of resisting the efflorescence of claim 1, wherein the inorganic filler is one or more of quartz sand, quartz powder, talcum powder, heavy calcium, light calcium and calcined kaolin.
7. The low-alkalinity waterproof slurry having the function of resisting the efflorescence of claim 1, wherein the water reducing agent is one or more of lignosulphonates, polycyclic aromatic salts, water-soluble resin sulphonates and polycarboxylates.
8. The low-alkalinity waterproof slurry with the function of resisting the efflorescence of claim 1, wherein the alkali-resistant agent is one or more of organic silicon hydrophobic powder, micro silicon powder, fly ash, an expanding agent and a water reducing agent.
9. The method for preparing the low-alkalinity water-proofing slurry with the function of resisting the efflorescence of any one of claims 1 to 8, which is characterized by comprising the following steps:
liquid material preparation:
(1) weighing the styrene-acrylate copolymer emulsion and the butadiene-styrene copolymer emulsion, putting into a stirring kettle, and starting low-speed stirring at the stirring speed of 600-800 r/min;
(2) adding the preservative, the antifreeze and the defoamer into a stirring kettle while stirring, and stirring for 3-8 minutes at a speed of 600-800 r/min;
(3) adding water accounting for 50-90% of the total amount of the formula, and continuously stirring for 3-8 minutes;
(4) premixing the thickening agent and the balance of water, putting the mixture into a dispersion kettle while stirring, and stirring for 10-30 minutes at a speed of 800-1000 r/min;
(5) after the central control detection is qualified, filtering, discharging and packaging for later use;
preparing powder:
(1) weighing sulphoaluminate cement and inorganic filler, putting into a stirring kettle, and starting low-speed stirring at the stirring speed of 50-80 r/min;
(2) accurately weighing the water reducing agent, the alkali-efflorescence resistant agent, the water-retaining agent and the metakaolin respectively, feeding the materials from a master batch feeding port, and stirring for 10-30 minutes;
when the powder material is used, the liquid material and the powder material are mixed according to the weight ratio (8-10): 25, mixing, stirring uniformly, and constructing.
Priority Applications (1)
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| CN112194440A (en) * | 2020-09-17 | 2021-01-08 | 广东嘉宝莉科技材料有限公司 | Alkali-resistant and anti-permeability waterproof slurry and construction process thereof |
| CN112375411A (en) * | 2020-10-30 | 2021-02-19 | 中科院广州化灌工程有限公司 | Epoxy modified polymer cement anticorrosive paint and preparation method and application thereof |
| CN113061380A (en) * | 2021-04-24 | 2021-07-02 | 上海新平精细化学品有限公司 | Rapid plugging agent and preparation method and application method thereof |
| CN113636819A (en) * | 2021-09-02 | 2021-11-12 | 湖北三棵树新材料科技有限公司 | Early-stage efflorescence-resistant polymer cement waterproof mortar and preparation method thereof |
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| CN112194440A (en) * | 2020-09-17 | 2021-01-08 | 广东嘉宝莉科技材料有限公司 | Alkali-resistant and anti-permeability waterproof slurry and construction process thereof |
| CN112375411A (en) * | 2020-10-30 | 2021-02-19 | 中科院广州化灌工程有限公司 | Epoxy modified polymer cement anticorrosive paint and preparation method and application thereof |
| CN113061380A (en) * | 2021-04-24 | 2021-07-02 | 上海新平精细化学品有限公司 | Rapid plugging agent and preparation method and application method thereof |
| CN113061380B (en) * | 2021-04-24 | 2022-05-17 | 上海新平精细化学品有限公司 | Rapid plugging agent and preparation method and application method thereof |
| CN113636819A (en) * | 2021-09-02 | 2021-11-12 | 湖北三棵树新材料科技有限公司 | Early-stage efflorescence-resistant polymer cement waterproof mortar and preparation method thereof |
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