CN111302696A - Regulator for recycled aggregate mortar and preparation method thereof - Google Patents
Regulator for recycled aggregate mortar and preparation method thereof Download PDFInfo
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- CN111302696A CN111302696A CN202010140831.4A CN202010140831A CN111302696A CN 111302696 A CN111302696 A CN 111302696A CN 202010140831 A CN202010140831 A CN 202010140831A CN 111302696 A CN111302696 A CN 111302696A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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Abstract
The invention discloses a regulator for recycled aggregate mortar and a preparation method thereof, relating to the technical field of mortar admixtures, and the technical scheme is characterized in that the regulator for recycled aggregate mortar comprises the following components in 1000 parts by weight: 4-6 parts of methyl cellulose, 3-5 parts of starch ether, 4-6 parts of polyvinyl alcohol, 10-20 parts of air entraining agent and the balance of water. The regulator for the recycled aggregate mortar has the advantages of improving the flexibility, plasticity, fluidity, water retention property and anti-sagging property of the recycled aggregate mortar and improving the binding power between the recycled aggregate and cement.
Description
Technical Field
The invention relates to the technical field of mortar admixtures, in particular to a regulator for recycled aggregate mortar and a preparation method thereof.
Background
The mortar is a bonding substance used for building bricks on a building, and is formed by mixing fine aggregate (sand), cementing materials (cement, lime paste, clay and the like) and water in proportion; the mortar can be divided into masonry mortar and plastering mortar, and the masonry mortar is used for masonry of bricks, stones, building blocks and the like and installation of members; the plastering mortar is used for plastering the surfaces of wall surfaces, ground surfaces, roof surfaces, beam-column structures and the like. The fine aggregate for mortar is mainly natural sand, but with the shortage of natural sand resources, in recent years, recycled aggregate mortar using recycled aggregate instead of natural sand has also appeared. The recycled aggregate is prepared by crushing and screening waste concrete in the construction waste, can partially or completely replace natural sand, not only can greatly relieve the problem of insufficient supply of the natural sand, but also can recycle the construction waste and reduce the pollution of the construction waste to the natural environment.
In the prior art, the patent application publication No. CN106007562A discloses a dry-mixed mortar prepared by using construction waste recycled aggregate and a preparation method thereof, the construction waste is subjected to necessary treatments such as hammering, vibrating and the like in a removal place, two-stage crushing is carried out on the construction waste by using a jaw crusher, the construction waste recycled aggregate with the thickness of 0.15-5mm is obtained by separation, and then the dry-mixed mortar is prepared according to P.O 42.5.5R 100 parts of common silicate cement, 500 parts of construction waste recycled aggregate 400, 20-30 parts of secondary fly ash, 0.7-1.0 part of excitant, 1.0-1.2 parts of interface intensifier, 0.1-0.3 part of water-retaining agent, 1.0-1.8 parts of water-reducing agent and 0.3-0.5 part of reinforcing fiber.
However, compared with natural aggregate, the surface of the recycled aggregate is wrapped by a large amount of cement mortar, and the cement mortar has large porosity and numerous edges and corners, so the surface density and the stacking density of the recycled aggregate are lower than those of the natural aggregate, and the water absorption is high; and because the construction waste can be broken and deformed again in the process of breaking, the surface cracks of the construction waste are increased, and the mechanical strength is lower.
The freshly mixed common mortar has good workability, and the hardened mortar has required strength and binding power; in the recycled aggregate mortar, a large amount of cement mortar is coated on the surface of the recycled aggregate, and the surface of the recycled aggregate mortar is rough and polygonal, so that the binding force between the recycled aggregate mortar and a binding material can be increased, but the flowability and the water retention of fresh mixed mortar are reduced, and the workability of the recycled mortar is influenced. In order to make the surface of the recycled aggregate cleaner and smoother, mortar or cement stones adhered to the surface of the aggregate can be effectively knocked off by a mechanical strengthening method through the mutual impact and friction between particles moving at high speed, and more prominent edges and corners on the aggregate particles are removed. Therefore, how to improve the workability of the recycled aggregate mortar more simply is a problem to be solved.
Disclosure of Invention
In view of the disadvantages of the prior art, the first object of the present invention is to provide a conditioning agent for recycled aggregate mortar, which has advantages of improving the flexibility, plasticity, fluidity, water retention property, sag resistance and binding power between recycled aggregate and cement of recycled aggregate mortar.
The second purpose of the invention is to provide a preparation method of the conditioning agent for recycled aggregate mortar, which has the advantages of simple operation and easy operation.
In order to achieve the first object, the invention provides the following technical scheme: the regulator for the recycled aggregate mortar comprises the following components in 1000 parts by weight: 4-6 parts of methyl cellulose, 3-5 parts of starch ether, 4-6 parts of polyvinyl alcohol, 10-20 parts of air entraining agent and the balance of water.
By adopting the technical scheme, the regulator prepared from methyl cellulose, starch ether, polyvinyl alcohol, an air entraining agent and water has good wettability, cohesiveness, water-retaining property and film-forming property, on one hand, the fluidity and the water-retaining property of the recycled aggregate mortar and the cohesiveness between the aggregate and cement can be improved, on the other hand, capillary pores blocking the recycled aggregate can be filled, and microcracks on the surface of the recycled aggregate are adhered and pores are filled, so that the strength of the hardened mortar is improved.
Further, the paint comprises the following components in parts by weight of 1000: 5 parts of methyl cellulose, 4 parts of starch ether, 5 parts of polyvinyl alcohol, 15 parts of air entraining agent and the balance of water.
By adopting the technical scheme, the obtained regulator has a good regulating effect on the freshly mixed recycled aggregate mortar in the proportion, and the workability of the freshly mixed recycled aggregate mortar can be improved.
Further, the air entraining agent is prepared from the following raw materials in parts by weight: 100 parts of rosin resin, 4-6 parts of maleic anhydride, 6-9 parts of acrylic acid and 30-40 parts of modifier; the modifier comprises the following components: isomeric alcohol polyoxyethylene ether, octyl phenol polyoxyethylene ether, methoxy polyethylene glycol, polyvinylpyrrolidone, coconut monoethanolamide and water.
By adopting the technical scheme, the fluidity, the water retention property and the cohesiveness of the freshly mixed mortar can be improved by adding the air entraining agent, particularly for the recycled aggregate mortar, the recycled aggregate mortar has poor fluidity due to rough and polygonal surface, and a large amount of uniformly distributed, closed and stable micro bubbles can be introduced in the process of mixing the mortar by adding the air entraining agent, so that the workability of the recycled aggregate mortar can be greatly improved; and the air entraining agent can be filled into the capillary pores of the recycled aggregate after being mixed with the methyl cellulose, the starch ether and the polyvinyl alcohol, and can bond the micro cracks on the surface of the recycled aggregate and fill the pores, thereby improving the strength of the hardened mortar.
Further, the modifier is prepared by adopting the following method: taking 50 parts by weight of water, adding 10-15 parts of isomeric alcohol polyoxyethylene ether, 4-6 parts of octylphenol polyoxyethylene ether, 10-12 parts of methoxy polyethylene glycol, 3-5 parts of polyvinylpyrrolidone and 3-5 parts of coconut monoethanolamide, and uniformly stirring to obtain the modifier.
By adopting the technical scheme, the isomeric alcohol polyoxyethylene ether has good dispersibility, wettability and permeability, and the modifier prepared by mixing the isomeric alcohol polyoxyethylene ether, the octyl phenol polyoxyethylene ether, the methoxy polyethylene glycol, the polyvinylpyrrolidone and the coconut monoethanolamide can be used for carrying out esterification reaction on the maleic rosin resin, so that the reaction activity can be increased, the uniformity of bubbles generated by the air entraining agent can be improved, and the recycled aggregate mortar has good fluidity in the stirring process.
Further, the air entraining agent is prepared by adopting the following method:
① taking 100 parts of rosin resin by weight, crushing, heating and melting the rosin resin, adding 4-6 parts of maleic anhydride and 2-3 parts of acrylic acid, and stirring for 2-3 hours at the temperature of 160-;
② adding 4-6 parts of acrylic acid and 30-40 parts of modifier into the maleic rosin resin, heating to 190 ℃ at 180 ℃, and preserving heat for 3-4 hours under the protection of nitrogen to perform esterification reaction to obtain an esterified substance;
③ after esterification, cooling the esterified substance to 85-95 ℃, adding alkali liquor and water, adjusting the pH to 7-8, and obtaining the air entraining agent with the solid content of 30 +/-1%.
By adopting the technical scheme, the rosin resin is reacted with maleic anhydride and acrylic acid, and the rosin resin can be pre-activated to obtain the maleic rosin resin; then, the maleic rosin resin, acrylic acid and a modifier are subjected to esterification reaction, so that the reaction activity of the maleic rosin resin can be improved, and the hydrophilicity of the air entraining agent is improved, so that the solubility of the maleic rosin resin in water is improved; the obtained air entraining agent can form stable microcolloids after being dissolved and mixed with methyl cellulose, starch ether and polyvinyl alcohol with good water solubility; thereby improving the flexibility, plasticity, continuity and anti-sagging property of the recycled aggregate mortar and improving the working performance of the recycled aggregate mortar.
Further, the isomeric alcohol polyoxyethylene ether is one of isomeric dodecyl alcohol polyoxyethylene ether, isomeric undecyl alcohol polyoxyethylene ether and isomeric tridecyl alcohol polyoxyethylene ether.
In order to achieve the second object, the invention provides the following technical scheme:
a preparation method of a regulator for recycled aggregate mortar comprises the following steps:
s1, taking a certain amount of water according to the proportion, adding methyl cellulose and starch ether into the water, and stirring and dissolving to obtain a mixed solution;
and S2, adding polyvinyl alcohol and an air entraining agent into the mixed solution, and uniformly stirring to obtain the recycled aggregate mortar regulator.
By adopting the technical scheme, the methyl cellulose, the starch ether, the polyvinyl alcohol and the air entraining agent are mixed, the operation is simple, and the realization is easy.
Further, the stirring speed in S2 is 300-500r/min, and the stirring time is 10-20 min.
By adopting the technical scheme, the raw materials are stirred at the speed of 300-500r/min, so that the raw materials can be fully dispersed in water to form a stable alkaline micro-colloidal solution.
In summary, compared with the prior art, the invention has the following beneficial effects:
1. the regulator prepared from methyl cellulose, starch ether, polyvinyl alcohol, an air entraining agent and water has good wettability, cohesiveness, water-retaining property and film-forming property, can improve the fluidity and water-retaining property of the recycled aggregate mortar and the cohesiveness between the aggregate and the cement on the one hand, and can fill and block capillary pores of the recycled aggregate, adhere micro cracks on the surface of the recycled aggregate and fill pores on the other hand, thereby improving the strength of the hardened mortar;
2. the addition of the air entraining agent can improve the fluidity, water retention property and cohesiveness of the freshly mixed mortar, particularly for the recycled aggregate mortar, the recycled aggregate mortar has poor fluidity due to rough and polygonal surface, and a large amount of uniformly distributed, closed and stable micro bubbles can be introduced in the process of mixing the mortar by adding the air entraining agent, so that the workability of the recycled aggregate mortar can be greatly improved; the air entraining agent can be filled into capillary pores of the recycled aggregate after being mixed with the methyl cellulose, the starch ether and the polyvinyl alcohol, and can bond micro cracks on the surface of the recycled aggregate and fill pores, so that the strength of the hardened mortar is improved;
3. reacting rosin resin with maleic anhydride and acrylic acid, and pre-activating the rosin resin to obtain maleic rosin resin; then, the maleic rosin resin, acrylic acid and a modifier are subjected to esterification reaction, so that the reaction activity of the maleic rosin resin can be improved, and the hydrophilicity of the air entraining agent is improved, so that the solubility of the maleic rosin resin in water is improved; the obtained air entraining agent can form stable microcolloids after being dissolved and mixed with methyl cellulose, starch ether and polyvinyl alcohol with good water solubility; thereby improving the flexibility, plasticity, continuity and anti-sagging property of the recycled aggregate mortar and improving the working performance of the recycled aggregate mortar.
Detailed Description
The present invention will be described in further detail below.
Preparation examples of air entraining agent the isomeric decyl alcohol polyoxyethylene ether in the following preparation examples is selected from isomeric decyl alcohol polyoxyethylene ether emulsifiers provided by Adie chemical south-channel Co., Ltd. and having the model number of E-1006; the isomeric undecyl alcohol polyoxyethylene ether is selected from isomeric undecyl alcohol polyoxyethylene ether provided by Solvay and having the model number of 5 EO; the isomeric tridecanol polyoxyethylene ether is selected from isomeric tridecanol polyoxyethylene ether emulsifier provided by Addie chemical Nantong Co Ltd and having the model number of E-1360; the polyoxyethylene octylphenol ether is selected from polyoxyethylene octylphenol ether emulsifier with model number of OP-3 provided by Sancheng chemical Limited in south Tong Han province; the methoxypolyethylene glycol is selected from MPEG-500 methoxypolyethylene glycol provided by Nantong Han sanden chemical Limited; the polyvinylpyrrolidone is selected from polyvinylpyrrolidone with model K30 provided by Hengli chemical industry and business of New Zheng city; the coconut monoethanolamide is selected from coconut monoethanolamide provided by Suzhou Yuitarun chemical Co., Ltd; the rosin resin is chemical company of Jinan Yuno; acrylic acid is provided by Jiangyin Xinbo chemical Co., Ltd; maleic anhydride is provided for the Huifeng petrochemical industry.
① preparation example of air entraining agent 50g of water is taken, 12.5g of isomeric dodecyl polyoxyethylene ether, 5g of octyl phenol polyoxyethylene ether, 11g of methoxy polyethylene glycol, 4g of polyvinylpyrrolidone and 4g of coconut monoethanolamide are added into the water, and the mixture is stirred uniformly to obtain the modifier;
② taking 100g of rosin resin, crushing, heating and melting the rosin resin, adding 5g of maleic anhydride and 2.5g of acrylic acid, and stirring for 2.5 hours at the temperature of 165 ℃ to obtain the maleic rosin resin;
③ adding 5g of acrylic acid and 35g of modifier into the maleic rosin resin, heating to 185 ℃, keeping the temperature for 3.5 hours under the protection of nitrogen, and carrying out esterification reaction to obtain an esterified substance;
④ after esterification, cooling the esterified product to 90 ℃, adding 20 wt% of sodium hydroxide aqueous solution and deionized water, and adjusting the pH to 8 to obtain the air entraining agent with the solid content of 30%.
① preparation example of the air entraining agent, namely, 50g of water is taken, 10g of isomeric undecyl alcohol polyoxyethylene ether, 4g of octyl phenol polyoxyethylene ether, 10g of methoxy polyethylene glycol, 3g of polyvinylpyrrolidone and 3g of coconut monoethanolamide are added into the water, and the mixture is stirred uniformly to obtain the modifier;
② taking 100g of rosin resin, crushing, heating and melting the rosin resin, adding 4g of maleic anhydride and 2g of acrylic acid, and stirring for 2 hours at the temperature of 160 ℃ to obtain the maleic rosin resin;
③ adding 4g of acrylic acid and 30g of modifier into the maleic rosin resin, heating to 180 ℃, preserving heat for 3 hours under the protection of nitrogen, and carrying out esterification reaction to obtain an esterified substance;
④ after esterification, cooling the esterified product to 85 ℃, adding 20 wt% of sodium hydroxide aqueous solution and deionized water, and adjusting the pH to 7 to obtain the air entraining agent with the solid content of 30%.
① preparation example of air entraining agent 50g of water is taken, 15g of isomeric tridecanol polyoxyethylene ether, 6g of octylphenol polyoxyethylene ether, 12g of methoxy polyethylene glycol, 5g of polyvinylpyrrolidone and 5g of coconut monoethanolamide are added into the water, and the modifier is obtained after the mixture is uniformly stirred;
② taking 100g of rosin resin, crushing, heating and melting the rosin resin, adding 6g of maleic anhydride and 3g of acrylic acid, and stirring for 3 hours at the temperature of 170 ℃ to obtain the maleic rosin resin;
③ adding 6g of acrylic acid and 40g of modifier into the maleic rosin resin, heating to 190 ℃, keeping the temperature for 4 hours under the protection of nitrogen, and carrying out esterification reaction to obtain an esterified substance;
④ after esterification, cooling the esterified product to 95 ℃, adding 20 wt% of sodium hydroxide aqueous solution and deionized water, and adjusting the pH to 8 to obtain the air entraining agent with the solid content of 30%.
Air entraining agent preparation example 4 this preparation example differs from preparation example 1 in that no modifier is added in step ④.
Air entraining agent production example 5 this production example is different from production example 1 in that acrylic acid in ③ was replaced with an equal amount of concentrated sulfuric acid, and no acrylic acid was added in step ④.
Preparation example 6 of air entraining agent the difference between this preparation example and preparation example 1 is that methoxy polyethylene glycol, polyvinylpyrrolidone, and coconut monoethanolamide are not added to the raw materials of the modifier in step ①.
Examples
The methylcellulose in the following examples is selected from methylcellulose available from Henan Guam Biotech, Inc.; the starch ether is selected from starch ether provided by Ivory in Netherlands with the model number of 301; the polyvinyl alcohol is selected from 100-27 type polyvinyl alcohol provided by Chinese petrifaction; the air entraining agents in examples 1 to 3 were rosin soap air entraining agents provided by deep sea energy saving building materials ltd, guan, inc.
Example 1: the regulator for the recycled aggregate mortar is prepared by the following method:
s1, according to the proportion, 971g of deionized water is taken, heated to 70 ℃, 5g of methylcellulose and 4g of starch ether are added, and after stirring and dissolving, mixed liquor is obtained;
and S2, adding 5g of polyvinyl alcohol and 15g of air entraining agent into the mixed solution, stirring at the temperature of 70 ℃ and the speed of 400r/min for 15min, and cooling to obtain the recycled aggregate mortar regulator.
Example 2: the regulator for the recycled aggregate mortar is prepared by the following method:
s1, according to the proportion, 979g of deionized water is taken, heated to 70 ℃, added with 4g of methyl cellulose and 3g of starch ether, stirred and dissolved to obtain a mixed solution;
and S2, adding 4g of polyvinyl alcohol and 10g of air entraining agent into the mixed solution, stirring at the temperature of 70 ℃ and at the speed of 300r/min for 10min, and cooling to obtain the recycled aggregate mortar regulator.
Example 3: the regulator for the recycled aggregate mortar is prepared by the following method:
s1, taking 963g of deionized water according to the proportion, heating the deionized water to 70 ℃, adding 6g of methylcellulose and 5g of starch ether into the deionized water, and stirring and dissolving to obtain a mixed solution;
and S2, adding 6g of polyvinyl alcohol and 20g of air entraining agent into the mixed solution, stirring at the temperature of 70 ℃ and the speed of 500r/min for 20min, and cooling to obtain the recycled aggregate mortar regulator.
Example 4: this example is different from example 1 in that the air-entraining agent is selected from those prepared in preparation example 1 of the air-entraining agent.
Example 5: this example is different from example 1 in that the air-entraining agent is prepared by selecting from air-entraining agent preparation example 2.
Example 6: this example is different from example 1 in that the air-entraining agent is prepared by selecting from air-entraining agent preparation example 3.
Example 7: this example is different from example 1 in that the air-entraining agent is prepared by selecting from air-entraining agent preparation example 4.
Example 8: this example is different from example 1 in that the air-entraining agent is prepared by selecting from air-entraining agent preparation example 5.
Example 9: this example is different from example 1 in that the air-entraining agent is prepared by selecting from preparation example 6 of the air-entraining agent.
Comparative example
Comparative example 1: this comparative example differs from example 1 in that the amount of air entraining agent was 9kg and the amount of deionized water was 977 kg.
Comparative example 2: this comparative example differs from example 1 in that the amount of air-entraining agent was 21kg and the amount of deionized water was 965 kg.
Performance testing
The conditioning agents prepared in examples 1 to 9 and comparative examples 1 to 2 were used in the machine-blasted mortar in an amount of 10kg/m3The mechanical sand-blasting mortar is prepared according to DPM5 plastering mortar, wherein the fine aggregate is recycled fine aggregate, the stone powder content of the recycled fine aggregate is 8.3%, the water absorption is 2.1%, the crushing index is 18%, and the particle size is 0.25-0.5 mm; meanwhile, plastering mortar without a regulator is set as a blank example. Testing the fluidity of cement mortar according to GB/T2419-2005 'method for measuring fluidity of cement mortar'; according to GB/T25181-2010 premixed mortar, the consistency, the 2h consistency loss rate, the water retention rate, the 14d tensile bonding strength, the 28d compressive strength and the 28d shrinkage rate of the recycled aggregate mortar are tested; the test results are shown in table 1.
TABLE 1 mortar Property test Table in examples 1 to 9 and comparative examples 1 to 2
As can be seen from the data in Table 1, the modifier prepared in the examples 1 to 3 of the present invention can significantly improve the fluidity and water retention of mortar, improve the workability of recycled aggregate mortar, increase the tensile bond strength and compressive strength of hardened mortar, and significantly improve the frost resistance of mortar when used in recycled aggregate mortar. As can be seen from the comparison between examples 4 to 6 and example 1, the effect of improving the mortar performance is more remarkable when the air-entraining agent prepared by the present invention is added to the conditioner than when the air-entraining agent is commercially available as a rosin air-entraining agent.
The air entraining agent of the example 7 is prepared by the preparation example 4 of the air entraining agent, the modifier is not added in the step ④ of the preparation example, compared with the example 4, the mortar flow and the water retention property are reduced in the example 7, the tensile bonding strength and the compressive strength after hardening are obviously reduced, the shrinkage rate is increased, and the frost resistance performance is deteriorated, which shows that the addition of the modifier can improve the effect of the air entraining agent, and obviously improve the workability and the mechanical strength of the recycled aggregate mortar.
The air entraining agent of example 8 was prepared from preparation example 5 in which the same amount of concentrated sulfuric acid was used instead of ③, and no acrylic acid was added in step ④. in example 8, compared to example 4, the mortar flow and water retention were decreased, the tensile bond strength and compressive strength after hardening were significantly decreased, the shrinkage was increased, and the frost resistance was deteriorated, indicating that the addition of acrylic acid can improve the effect of the air entraining agent, and the workability and mechanical strength of the recycled aggregate mortar when preparing the air entraining agent.
The air entraining agent of example 9 is prepared from preparation example 6 of the air entraining agent, wherein methoxy polyethylene glycol, polyvinylpyrrolidone and coconut monoethanolamide are not added to the raw materials of the modifier of step ① in the preparation example, compared with example 4, the mortar in example 9 has reduced fluidity and water retention, obviously reduced tensile bond strength and compressive strength after hardening, increased shrinkage rate and poor freezing resistance, which shows that the addition of methoxy polyethylene glycol, polyvinylpyrrolidone and coconut monoethanolamide in the modifier can improve the effect of the air entraining agent and obviously improve the workability and mechanical strength of the recycled aggregate mortar when the air entraining agent is prepared.
The addition amount of the air entraining agent in the comparative example 1 is 9kg, compared with the example 1, the water retention in the comparative example 1 is reduced, the tensile bonding strength and the compressive strength after hardening are obviously reduced, the shrinkage rate is increased, and the frost resistance performance is deteriorated, which shows that when the amount of the air entraining agent is reduced, the mechanical property of the mortar is influenced.
The addition amount of the air-entraining agent in comparative example 2 is 21kg, and the performance of the mortar in comparative example 2 is not significantly improved compared with that of example 2, which shows that when the addition amount of the air-entraining agent is excessive, the performance of the mortar is not significantly improved, and the production cost is also increased. Therefore, the modifier obtained by adopting the proportion of the invention can improve the performance of the mortar and control certain production cost.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. A regulator for recycled aggregate mortar is characterized in that: the paint comprises the following components in parts by weight of 1000: 4-6 parts of methyl cellulose, 3-5 parts of starch ether, 4-6 parts of polyvinyl alcohol, 10-20 parts of air entraining agent and the balance of water.
2. The conditioner for recycled aggregate mortar according to claim 1, wherein: the paint comprises the following components in parts by weight of 1000: 5 parts of methyl cellulose, 4 parts of starch ether, 5 parts of polyvinyl alcohol, 15 parts of air entraining agent and the balance of water.
3. The conditioner for recycled aggregate mortar according to claim 1, wherein: the air entraining agent is prepared from the following raw materials in parts by weight: 100 parts of rosin resin, 4-6 parts of maleic anhydride, 6-9 parts of acrylic acid and 30-40 parts of modifier;
the modifier comprises the following components: isomeric alcohol polyoxyethylene ether, octyl phenol polyoxyethylene ether, methoxy polyethylene glycol, polyvinylpyrrolidone, coconut monoethanolamide and water.
4. The conditioner for recycled aggregate mortar according to claim 3, wherein: the modifier is prepared by adopting the following method: taking 50 parts by weight of water, adding 10-15 parts of isomeric alcohol polyoxyethylene ether, 4-6 parts of octylphenol polyoxyethylene ether, 10-12 parts of methoxy polyethylene glycol, 3-5 parts of polyvinylpyrrolidone and 3-5 parts of coconut monoethanolamide, and uniformly stirring to obtain the modifier.
5. The conditioner for recycled aggregate mortar according to claim 3, wherein: the air entraining agent is prepared by adopting the following method:
① taking 100 parts of rosin resin by weight, crushing, heating and melting the rosin resin, adding 4-6 parts of maleic anhydride and 2-3 parts of acrylic acid, and stirring for 2-3 hours at the temperature of 160-;
② adding 4-6 parts of acrylic acid and 30-40 parts of modifier into the maleic rosin resin, heating to 190 ℃ at 180 ℃, and preserving heat for 3-4 hours under the protection of nitrogen to perform esterification reaction to obtain an esterified substance;
③ after esterification, cooling the esterified substance to 85-95 ℃, adding alkali liquor and water, adjusting the pH to 7-8, and obtaining the air entraining agent with the solid content of 30 +/-1%.
6. The conditioner for recycled aggregate mortar according to claim 4, wherein: the isomeric alcohol polyoxyethylene ether is one of isomeric dodecyl alcohol polyoxyethylene ether, isomeric undecyl alcohol polyoxyethylene ether and isomeric tridecyl alcohol polyoxyethylene ether.
7. A method for preparing the conditioner for recycled aggregate mortar according to any one of claims 1 to 6, characterized in that: the method comprises the following steps:
s1, taking a certain amount of water according to the proportion, adding methyl cellulose and starch ether into the water, and stirring and dissolving to obtain a mixed solution;
and S2, adding polyvinyl alcohol and an air entraining agent into the mixed solution, and uniformly stirring to obtain the recycled aggregate mortar regulator.
8. The method for preparing the conditioner for recycled aggregate mortar according to claim 7, wherein the conditioner comprises: the stirring speed in S2 is 300-500r/min, and the stirring time is 10-20 min.
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| DE10239703A1 (en) * | 2002-08-29 | 2004-03-11 | Cognis Deutschland Gmbh & Co. Kg | Reduced air entraining agents |
| CN103145380A (en) * | 2013-02-27 | 2013-06-12 | 同济大学 | Cement-based shrinkage-free joint filling sealing mortar for doors and windows and preparation method and construction method thereof |
| CN103332893A (en) * | 2013-06-05 | 2013-10-02 | 绍兴益生砂浆有限公司 | Novel dry-mixed plastering mortar |
| CN103553424A (en) * | 2013-09-30 | 2014-02-05 | 江苏兆佳建材科技有限公司 | Aerated concrete interface agent |
| US20150329513A1 (en) * | 2014-05-19 | 2015-11-19 | MegaMatter Inc. | Large molecule and polymer flame retardants |
| CN105418011A (en) * | 2015-11-24 | 2016-03-23 | 中建商品混凝土西安有限公司 | Wet-mixed mortar doped with recycled fine aggregate |
| CN109721277A (en) * | 2019-02-01 | 2019-05-07 | 湖州盛世华骏新型材料有限公司 | A kind of multifunctional assistant and preparation method thereof haveing excellent performance |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113582630A (en) * | 2021-09-07 | 2021-11-02 | 河北金铎建设工程有限公司 | Thermal insulation wall body decorative layer dry material, mortar and wall body |
| CN113582630B (en) * | 2021-09-07 | 2022-05-27 | 河北金铎建设工程有限公司 | Thermal insulation wall body decorative layer dry material, mortar and wall body |
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