CN108975819B - Attapulgite exterior wall thermal insulation anti-crack mortar and preparation method thereof - Google Patents
Attapulgite exterior wall thermal insulation anti-crack mortar and preparation method thereof Download PDFInfo
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- CN108975819B CN108975819B CN201810968041.8A CN201810968041A CN108975819B CN 108975819 B CN108975819 B CN 108975819B CN 201810968041 A CN201810968041 A CN 201810968041A CN 108975819 B CN108975819 B CN 108975819B
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/14—Polycondensates modified by chemical after-treatment
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses attapulgite exterior wall thermal insulation anti-crack mortar and a preparation method thereof, relating to the technical field of building materials. The invention relates to external wall thermal insulation anti-crack mortar, which consists of the following raw materials in parts by weight: 40-50 parts of modified epoxy resin, 60-70 parts of quartz sand mixture, 15-20 parts of rubber powder, 20-30 parts of 42.5 portland cement, 10-15 parts of modified attapulgite powder, 5-10 parts of reinforcing fiber, 10-15 parts of polyethylene glycol 400, 1-5 parts of vitamin C and 1-5 parts of tea polyphenol; the invention carries out modification treatment on the epoxy resin and the attapulgite, improves the compressive strength and the flexural strength of the mortar, enhances the crack resistance of the plastering layer, and has good weather resistance and low cost.
Description
The technical field is as follows:
the invention relates to the technical field of building materials, in particular to attapulgite exterior wall thermal insulation anti-crack mortar and a preparation method thereof.
Background art:
mortar is a commonly used building material, generally used in masonry and plastering. The mortar is prepared by mixing a cementing material (cement, lime, clay and the like) and fine aggregate (sand) with water. According to the composition materials, the method can be divided into: lime mortar: the mortar is prepared from lime cream, sand and water according to a certain proportion, and is generally used for masonry and a plastering layer which have low strength requirement and are not affected by humidity; cement mortar: the mortar is prepared from cement, sand and water according to a certain proportion, and is generally used for brickworks, wall surfaces or ground surfaces and the like in a humid environment or water; mixing mortar: the mortar is prepared by adding proper admixture such as fly ash, diatomite and the like into cement or lime mortar to save the using amount of the cement or lime and improve the workability of the mortar, and the common mixed mortar comprises cement lime mortar, cement clay mortar, lime clay mortar and the like. The method is divided into the following steps according to different purposes: masonry mortar, finishing mortar (including decorative mortar and waterproof mortar), bonding mortar and the like.
The anti-crack mortar for the external wall insulation system is used for a plastering layer of the insulation system and protecting an insulation layer, and is required to have anti-crack, waterproof and anti-impact functions. One of the most common defects in the external thermal insulation system of the existing building external wall is cracks of a finishing layer. The defects not only affect the functions of heat preservation, heat insulation, water resistance, weather resistance and the like of the heat preservation system, but also can cause the heat preservation layer to mildew and fall off due to water seepage. The method improves the anti-cracking performance of the anti-cracking mortar of the external wall thermal insulation system, and is one of the main approaches for solving cracks of the plastering layer of the thermal insulation system.
The invention content is as follows:
the invention aims to solve the technical problem that under the condition of improving the adhesive force and adhesive strength of the interface mortar, the drying shrinkage is reduced so as to reduce the stress on the heat-insulating layer caused by the interface mortar and avoid cracking, hollowing and falling off of the heat-insulating layer. Meanwhile, the cost of the interface mortar is reduced, and other performances such as flame retardance, heat insulation, weather resistance and the like are improved.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
the attapulgite exterior wall thermal insulation anti-crack mortar is prepared from the following raw materials in parts by weight:
40-50 parts of modified epoxy resin, 60-70 parts of quartz sand mixture, 15-20 parts of rubber powder, 20-30 parts of 42.5 portland cement, 10-15 parts of modified attapulgite powder, 5-10 parts of reinforcing fiber, 10-15 parts of polyethylene glycol 400, 1-5 parts of vitamin C and 1-5 parts of tea polyphenol.
The preparation method of the modified epoxy resin comprises the following steps:
(1) putting the chitosan solid into a reaction kettle, and adding an acetic acid solution with the mass fraction of 5% to prepare a chitosan acetic acid solution for later use;
(2) adding epoxy chloropropane into anhydrous ethanol, heating to reflux state, stirring for 10-20min under heat preservation, adding trimethylolethane and initiator, and continuing to reflux and stir for 1-2 h; and (2) adding the chitosan acetic acid solution and the ionic crosslinking agent in the step (1), continuously refluxing and stirring for 1-2h, filtering while hot, washing impurities of the precipitate by using deionized water and absolute ethyl alcohol, and drying in a drying box at the temperature of 100-.
The weight portions of the chitosan, the epichlorohydrin, the trimethylolethane, the initiator and the ionic crosslinking agent are respectively 15-20 portions, 20-30 portions, 1-5 portions and 1-3 portions.
The initiator is selected from benzoyl peroxide or lauroyl peroxide.
The ionic crosslinking agent is selected from one of sodium pyrophosphate and sodium tetrapolyphosphate.
The quartz sand mixture comprises 20-30 parts of 40-80-mesh quartz sand, 20-30 parts of 80-120-mesh quartz sand and 10-15 parts of 120-140-mesh quartz sand.
The preparation method of the modified attapulgite powder comprises the following steps: adding tripolyphosphoric acid and sodium silicate into deionized water, stirring until the tripolyphosphoric acid and the sodium silicate are completely dissolved, then adding attapulgite, mechanically stirring uniformly, and sieving with a 20-mesh sieve; then putting the attapulgite into a ball milling tank, grinding for 8h, aging for 24h, and then spray drying to prepare the modified attapulgite powder.
The deionized water, the attapulgite, the sodium tripolyphosphate and the sodium silicate are 75 parts, 25 parts, 0.3 part and 0.3 part by weight.
The ball milling pot is selected from one of a ceramic pot or a metal pot with a stone lining.
Attapulgite is a nanometer clay mineral with special structure. After being modified by a special grinding process, the adhesive has excellent adhesiveness, plasticity and workability. The coating has excellent weather resistance and small drying shrinkage, and improves the anti-cracking performance of the anti-cracking mortar finishing layer.
The rubber powder can improve the strength, flexibility, constructability and crack resistance of the crack-resistant mortar.
The reinforced fiber is selected from glass fiber or carbon fiber, and can obviously enhance the mechanical strength of the surface of the mortar, and has the advantages of impact resistance, extrusion resistance and difficult cracking.
The vitamin C and the tea polyphenol have high oxidation resistance and reactivity, can improve the toughness and the ageing resistance of the mortar, and have high resistance to severe environment and good weather resistance.
The preparation method of the thermal insulation anti-crack mortar comprises the following steps:
(1) putting the modified epoxy resin, the quartz sand mixture, 42.5 Portland cement, the modified attapulgite powder and the reinforcing fiber in parts by weight into a mixer, and stirring for 15-30 min;
(2) adding the rubber powder in parts by weight into the mixture in the step 1 and stirring for 5-10 min;
(3) and (3) adding the polyethylene glycol, the vitamin C and the tea polyphenol in parts by weight into the mixture obtained in the step (2), stirring for 10-30min, drying in a drying box at the temperature of 100-.
The invention has the beneficial effects that:
(1) the attapulgite is modified, so that the attapulgite has excellent adhesiveness and plasticity, and the compressive strength and the breaking strength of the attapulgite are improved; the modified attapulgite powder is used for replacing cellulose materials commonly used in mortar, so that the drying shrinkage of the anti-crack mortar is reduced, and the anti-crack performance of a finishing layer is enhanced;
(2) according to the invention, the epoxy resin is modified by using chitosan, so that the modified resin contains an adsorption film, the affinity of the epoxy resin to other raw materials is enhanced, meanwhile, the modified epoxy resin can be adsorbed on the plastering layer, and a compact net structure can be formed on the surface of the plastering layer by combining with other raw materials in mortar, so that the bonding capability of the anti-crack mortar and the heat insulation performance of the plastering layer are enhanced; the addition of the modified epoxy resin can improve the weather resistance of the anti-crack mortar, so that the anti-crack mortar has stronger resistance to environments such as high temperature, cold, illumination and the like;
(3) the method has the advantages of simple process, environmental protection and low cost, and is suitable for industrial production.
The specific implementation mode is as follows:
in order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example 1
Preparation of modified epoxy resin:
(1) putting 15 parts of chitosan solid into a reaction kettle, and adding an acetic acid solution with the mass fraction of 5% to prepare a chitosan acetic acid solution for later use;
(2) adding 20 parts of epichlorohydrin into absolute ethyl alcohol, heating to a reflux state, keeping the temperature and stirring for 10min, then adding 20 parts of trimethylolethane and 2 parts of benzoyl peroxide, and continuing to stir for 1h in a reflux manner; and adding the chitosan acetic acid solution obtained in the step 1 and 1 part of sodium pyrophosphate, continuously refluxing and stirring for 2 hours, filtering while hot, washing impurities of the precipitate by using deionized water and absolute ethyl alcohol, and drying in a drying box at the temperature of 100-.
The preparation of the modified attapulgite powder comprises the following steps: adding 0.3 part of tripolyphosphoric acid and 0.3 part of sodium silicate into 75 parts of deionized water, stirring until the tripolyphosphoric acid and the sodium silicate are completely dissolved, then adding 20 parts of attapulgite, mechanically stirring uniformly, and sieving by a 20-mesh sieve; then putting the attapulgite into a ceramic pot, grinding for 8h, aging for 24h, and then spray drying to prepare the modified attapulgite powder.
Preparing anti-crack mortar:
(1) putting 40 parts of modified epoxy resin, 27 parts of 40-mesh quartz, 25 parts of 80-mesh quartz sand, 10 parts of 120-mesh quartz sand, 30 parts of 42.5 Portland cement, 12 parts of modified attapulgite powder and 6 parts of glass fiber into a mixer and stirring for 20 min;
(2) adding 18 parts of rubber powder into the mixture in the step 1, stirring for 10min, and standing for 5 min;
(3) and (3) adding 10 parts of polyethylene glycol 400, 2 parts of vitamin C and 2 parts of tea polyphenol into the mixture obtained in the step (2), stirring for 15min, drying in a drying box at the temperature of 100 ℃ and 110 ℃ to constant weight, metering and packaging to obtain the anti-crack mortar.
Example 2
Preparation of modified epoxy resin:
(1) putting 15 parts of chitosan solid into a reaction kettle, and adding an acetic acid solution with the mass fraction of 5% to prepare a chitosan acetic acid solution for later use;
(2) adding 20 parts of epichlorohydrin into absolute ethyl alcohol, heating to a reflux state, keeping the temperature and stirring for 10min, then adding 20 parts of trimethylolethane and 2 parts of benzoyl peroxide, and continuing to stir for 1h in a reflux manner; and adding the chitosan acetic acid solution obtained in the step 1 and 1 part of sodium pyrophosphate, continuously refluxing and stirring for 2 hours, filtering while hot, washing impurities of the precipitate by using deionized water and absolute ethyl alcohol, and drying in a drying box at the temperature of 100-.
The preparation of the modified attapulgite powder comprises the following steps: adding 0.3 part of tripolyphosphoric acid and 0.3 part of sodium silicate into 75 parts of deionized water, stirring until the tripolyphosphoric acid and the sodium silicate are completely dissolved, then adding 20 parts of attapulgite, mechanically stirring uniformly, and sieving by a 20-mesh sieve; then putting the attapulgite into a ceramic pot, grinding for 8h, aging for 24h, and then spray drying to prepare the modified attapulgite powder.
Preparing anti-crack mortar:
(1) putting 40 parts of modified epoxy resin, 27 parts of 40-mesh quartz, 25 parts of 80-mesh quartz sand, 10 parts of 120-mesh quartz sand, 30 parts of 42.5 Portland cement, 12 parts of modified attapulgite powder and 6 parts of glass fiber into a mixer and stirring for 20 min;
(2) adding 18 parts of rubber powder into the mixture in the step 1, stirring for 10min, and standing for 5 min;
(3) and (3) adding 10 parts of polyethylene glycol 400, 2 parts of vitamin C and 2 parts of tea polyphenol into the mixture obtained in the step (2), stirring for 15min, drying in a drying box at the temperature of 100 ℃ and 110 ℃ to constant weight, metering and packaging to obtain the anti-crack mortar.
Comparative example 1
Preparation of epoxy resin: adding 20 parts of epichlorohydrin into absolute ethyl alcohol, heating to a reflux state, keeping the temperature and stirring for 10min, then adding 20 parts of trimethylolethane and 2 parts of benzoyl peroxide, and continuing to stir for 1h in a reflux manner; and then adding 1 part of sodium pyrophosphate, continuously refluxing and stirring for 2 hours, filtering while the solution is hot, washing impurities of the precipitate by using deionized water and absolute ethyl alcohol, and drying the precipitate in a drying box at the temperature of 100 ℃ and 110 ℃ to constant weight to obtain the epoxy resin.
The preparation of the modified attapulgite powder comprises the following steps: adding 0.3 part of tripolyphosphoric acid and 0.3 part of sodium silicate into 75 parts of deionized water, stirring until the tripolyphosphoric acid and the sodium silicate are completely dissolved, then adding 20 parts of attapulgite, mechanically stirring uniformly, and sieving by a 20-mesh sieve; then putting the attapulgite into a ceramic pot, grinding for 8h, aging for 24h, and then spray drying to prepare the modified attapulgite powder.
Preparing anti-crack mortar:
(1) putting 40 parts of epoxy resin, 27 parts of 40-mesh quartz, 25 parts of 80-mesh quartz sand, 10 parts of 120-mesh quartz sand, 30 parts of 42.5 Portland cement, 12 parts of modified attapulgite powder and 6 parts of glass fiber into a mixer and stirring for 20 min;
(2) adding 18 parts of rubber powder into the mixture in the step 1, stirring for 10min, and standing for 5 min;
(3) and (3) adding 10 parts of polyethylene glycol 400, 2 parts of vitamin C and 2 parts of tea polyphenol into the mixture obtained in the step (2), stirring for 15min, drying in a drying box at the temperature of 100 ℃ and 110 ℃ to constant weight, metering and packaging to obtain the anti-crack mortar.
Comparative example 2
Preparation of modified epoxy resin:
(1) putting 15 parts of chitosan solid into a reaction kettle, and adding an acetic acid solution with the mass fraction of 5% to prepare a chitosan acetic acid solution for later use;
(2) adding 20 parts of epichlorohydrin into absolute ethyl alcohol, heating to a reflux state, keeping the temperature and stirring for 10min, then adding 20 parts of trimethylolethane and 2 parts of benzoyl peroxide, and continuing to stir for 1h in a reflux manner; and adding the chitosan acetic acid solution obtained in the step 1 and 1 part of sodium pyrophosphate, continuously refluxing and stirring for 2 hours, filtering while hot, washing impurities of the precipitate by using deionized water and absolute ethyl alcohol, and drying in a drying box at the temperature of 100-.
Preparing anti-crack mortar:
(1) putting 40 parts of modified epoxy resin, 27 parts of 40-mesh quartz, 25 parts of 80-mesh quartz sand, 10 parts of 120-mesh quartz sand, 30 parts of 42.5 Portland cement, 12 parts of attapulgite powder and 6 parts of glass fiber into a mixer and stirring for 20 min;
(2) adding 18 parts of rubber powder into the mixture in the step 1, stirring for 10min, and standing for 5 min;
(3) and (3) adding 10 parts of polyethylene glycol 400, 2 parts of vitamin C and 2 parts of tea polyphenol into the mixture obtained in the step (2), stirring for 15min, drying in a drying box at the temperature of 100 ℃ and 110 ℃ to constant weight, metering and packaging to obtain the anti-crack mortar.
Example 3
Based on example 1, comparative example 1 in which the epoxy resin was not modified and comparative example 2 in which the attapulgite was not modified were provided.
The anti-crack mortar prepared in examples 1 to 2 and comparative examples 1 to 2 was measured for its properties, and the results are shown in Table 1.
TABLE 1 Performance testing of crack resistant mortars
From the data analysis of table 1, it can be seen that: all performance data of the mortar meet the performance requirements of mortar in the building industry standard of rubber powder polyphenyl particle external thermal insulation system JG 158-2004. The anti-crack mortar has small compression-fracture ratio, high non-soaking tensile bonding strength and soaking tensile bonding strength, moderate thickness, weather resistance and other indexes.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. The attapulgite exterior wall thermal insulation anti-crack mortar is characterized by comprising the following raw materials in parts by weight: 40-50 parts of modified epoxy resin, 60-70 parts of quartz sand mixture, 15-20 parts of rubber powder, 20-30 parts of 42.5 portland cement, 10-15 parts of modified attapulgite powder, 5-10 parts of reinforcing fiber, 10-15 parts of polyethylene glycol 400, 1-5 parts of vitamin C and 1-5 parts of tea polyphenol;
the preparation method of the modified epoxy resin comprises the following steps:
(1) putting the chitosan solid into a reaction kettle, and adding an acetic acid solution with the mass fraction of 5% to prepare a chitosan acetic acid solution for later use;
(2) adding epoxy chloropropane into anhydrous ethanol, heating to reflux state, stirring for 10-20min under heat preservation, adding trimethylolethane and initiator, and continuing to reflux and stir for 1-2 h; adding the chitosan acetic acid solution and the ionic cross-linking agent in the step 1, continuously refluxing and stirring for 1-2h, filtering while hot, washing impurities of the precipitate by using deionized water and absolute ethyl alcohol, and drying in a drying box at the temperature of 100-;
the preparation method of the modified attapulgite powder comprises the following steps: adding tripolyphosphoric acid and sodium silicate into deionized water, stirring until the tripolyphosphoric acid and the sodium silicate are completely dissolved, then adding attapulgite, mechanically stirring uniformly, and sieving with a 20-mesh sieve; then putting the attapulgite into a ball milling tank, grinding for 8h, aging for 24h, and then spray drying to prepare modified attapulgite powder;
the quartz sand mixture comprises 20-30 parts of 40-80-mesh quartz sand, 20-30 parts of 80-120-mesh quartz sand and 10-15 parts of 120-140-mesh quartz sand.
2. The attapulgite exterior wall thermal insulation anti-crack mortar of claim 1, which is characterized in that: the deionized water, the attapulgite, the sodium tripolyphosphate and the sodium silicate are 75 parts, 25 parts, 0.3 part and 0.3 part by weight.
3. The attapulgite exterior wall thermal insulation anti-crack mortar of claim 1, which is characterized in that: the ball milling pot is selected from one of a ceramic pot or a metal pot with a stone lining.
4. The preparation method of the attapulgite thermal insulation anti-crack mortar for the exterior wall according to any one of claims 1 to 3, which is characterized by comprising the following steps:
(1) putting the modified epoxy resin, the quartz sand mixture, 42.5 Portland cement, the modified attapulgite powder and the reinforcing fiber in parts by weight into a mixer, and stirring for 15-30 min;
(2) adding the rubber powder in parts by weight into the mixture in the step 1 and stirring for 5-10 min;
(3) and (3) adding the polyethylene glycol, the vitamin C and the tea polyphenol in parts by weight into the mixture obtained in the step (2), stirring for 10-30min, drying in a drying box at the temperature of 100-.
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| CN101711973A (en) * | 2008-10-07 | 2010-05-26 | 齐齐哈尔大学 | Preparation method of modified attapulgite particle retention and filtration aid |
| KR101164623B1 (en) * | 2012-04-23 | 2012-07-11 | 우리건설 주식회사 | Mortar composition for repairing concrete structure and using method thereof |
| CN105924048A (en) * | 2016-05-05 | 2016-09-07 | 哈尔滨工程大学 | Glass fiber reinforcement polymer modification cement for curtain wall board and preparing method |
| CN106082847A (en) * | 2016-06-14 | 2016-11-09 | 马鞍山十七冶工程科技有限责任公司 | A kind of for heat preserving crack resistant mortar for exterior wall formula |
| CN106396557B (en) * | 2016-09-18 | 2018-05-29 | 广西棕海园林工程有限公司 | ceramic tile adhesive mortar and preparation method thereof |
| CN106747008A (en) * | 2016-12-29 | 2017-05-31 | 中石化中原油建工程有限公司 | A kind of high-strength vibration damping epoxy resin mortar for adding nanometer modifier |
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