CN110272242B - Anti-cracking polyvinyl alcohol green ultra-light base material and preparation method thereof - Google Patents
Anti-cracking polyvinyl alcohol green ultra-light base material and preparation method thereof Download PDFInfo
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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
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- C04B28/04—Portland cements
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- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
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Abstract
The invention relates to the technical field of ecological slope protection base materials, and particularly discloses an anti-cracking polyvinyl alcohol green ultra-light base material and a preparation method thereof, wherein the anti-cracking polyvinyl alcohol green ultra-light base material comprises the following steps: (1) taking raw material soil, drying and sieving for later use; (2) adding a curing agent into the sieved raw material soil, and uniformly mixing; (3) adding water into the mixture obtained in the step (2), and stirring uniformly; (4) and (4) adding polyvinyl alcohol powder, polyvinyl alcohol fibers, a gelling agent, a filler, a defoaming agent, a wetting agent, a preservative and a pigment into the mixture obtained in the step (3) according to a certain mixing amount, and then uniformly stirring to obtain the polyvinyl alcohol water-based paint. According to the invention, the light material has the advantages of cracking resistance, impermeability, scouring resistance, super light weight, attractiveness and the like while ensuring that the strength of the composite soil body meets the ecological protection requirement of the side slope, the slope load is reduced, the slope protection plants can be prevented from dying due to water and soil loss, green elements are provided for the slope before vegetation germination, and the visual fatigue caused by dark base materials is avoided while the landscape effect is achieved.
Description
Technical Field
The invention relates to the technical field of ecological slope protection base materials, in particular to an anti-cracking polyvinyl alcohol green ultra-light base material and a preparation method thereof.
Background
Under the conditions of sunshine and wind blowing, the vegetation slope protection base material does not have enough time to form tensile strength to resist capillary shrinkage force generated by rapid evaporation, plastic shrinkage cracking is easy to generate, and the crack resistance, the impermeability and the durability of the base material are reduced; moreover, the base material is subjected to rain wash, so that the water and soil loss is increasingly serious, the survival rate of vegetation is reduced, and the anti-wash capability of the base material is weakened; in addition, the traditional ecological slope protection base material mainly comprising the cement base body increases the slope load due to large mass, and increases hidden danger for the slope stability; moreover, the traditional ecological slope protection base material is dark in color, and visual fatigue is easily caused on the slope surface before vegetation germination, so that the external landscape of the slope surface is affected.
The applicant researches and discovers that polyvinyl alcohol (PVA) with high polymerization degree (molecular weight of 84000-124000) is white powder and is dissolved in water, the viscosity of the aqueous solution of the polyvinyl alcohol is gradually increased along with time, the tensile strength and the solvent resistance after film forming are improved, and the polyvinyl alcohol film has a certain elongation, is good in light resistance, is not influenced by illumination, is non-toxic and has no irritation to human skin. The PVA fiber has obvious effect as a reinforced material: (1) the expansion of original defects (micro cracks) in the cement matrix is prevented, and the appearance of new cracks is delayed; (2) the deformability of the cement matrix is improved and thus the toughness and impact resistance are improved; (3) the tensile property of the cement matrix is improved; (4) the anti-permeability performance of the cement matrix is improved. Moreover, when the materials such as the gelatinizing agent, the filler, the defoaming agent and the like are applied to the material taking the cement matrix as the main body, the mass of the cement matrix can be obviously reduced, and thus the load of the slope surface is reduced. In addition, the phthalocyanine green pigment can be applied to a cement matrix material, so that green elements can be provided for the slope surface before vegetation sprouts, and the visual fatigue caused by a dark base material is avoided, and the landscape effect is achieved.
Therefore, the polyvinyl alcohol powder with high polymerization degree (molecular weight of 84000-.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an anti-cracking polyvinyl alcohol green ultra-light base material. The base material has the advantages of cracking resistance, permeability resistance, scouring resistance, super light weight, attractive appearance, prevention of vegetation death due to water and soil loss and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
the anti-cracking polyvinyl alcohol green ultra-light base material comprises the following components: raw material soil (the raw material soil is dried and sieved), curing agent, water, polyvinyl alcohol powder, PVA fiber, gelling agent, filler, defoaming agent, wetting agent, preservative and pigment.
Preferably, the doping amount (mass percentage of the raw material soil) of each component of the base material is as follows:
preferably, the polyvinyl alcohol powder adopts the following specifications: the average polymerization degree is 1700-1800DP, the molecular weight is 84000-124000, and the alcoholysis degree is 87-99%.
Preferably, the PVA fibers are of 9mm grade (length), 15 μm or 24 μm in diameter, light yellow in appearance and 1.3g/cm in density3The tensile strength is 800-1600MPa, the tensile limit is 6-8%, the melting point is 230 ℃, the elastic modulus is 35GPa, and the single fiber fineness is 2.0 dtex.
Preferably, the gelling agent is borax.
Preferably, the filler has a particle size of 2-100 μm and a density of 40-60g/dm3The white carbon black.
Preferably, the pigment is phthalocyanine green.
Preferably, the raw material soil is riverway mucky soil.
Preferably, the curing agent is 42.5 grade Portland cement.
Preferably, the defoaming agent is modified silicon polydimethylsiloxane high-efficiency defoaming agent emulsion, the appearance of the defoaming agent is white emulsion-shaped liquid, the pH value is 7-8, the active matter content is 25wt%, the viscosity is 1000-1600mPa.s, and the defoaming agent is nonionic.
Preferably, the humectant is sterile 20wt% glycerol.
Preferably, the preservative is an isothiazolinone solution with an active content of 14 wt%.
In addition, the invention also claims a preparation method of the anti-cracking polyvinyl alcohol green ultra-light base material, the preparation method improves the crack resistance, the impermeability and the scouring resistance of the base material by adding high-polymerization degree polyvinyl alcohol powder and PVA fiber into raw material soil, and adds borax, white carbon black and other materials, so that the base material has the ultra-light characteristic, can reduce slope load, ensures that the self strength of soil body meets the requirement of slope ecological protection, and adds phthalocyanine green pigment to provide green elements for the slope before vegetation germination, so that the base material has landscape effect while avoiding visual fatigue caused by dark base material. The preparation process method comprises the following steps:
(1) taking raw material soil, placing the raw material soil in an oven for drying, and sieving by a sieve of 1mm to obtain dried and sieved raw material soil for later use;
(2) adding a curing agent into the raw material soil sieved in the step (1), and uniformly mixing;
(3) adding water into the mixture obtained in the step (2), and then uniformly stirring in a stirrer;
(4) and (4) sequentially adding polyvinyl alcohol powder, PVA fibers, a gelling agent, a filler, an antifoaming agent, a wetting agent, a preservative and a pigment into the mixture obtained in the step (3), and uniformly stirring in a stirrer at a constant speed to form the anti-crack polyvinyl alcohol green ultra-light base material.
Preferably, the stirring speed in the step (3) is set to be 105-120r/min, so that the soil body can be rapidly in a soft plastic-flow plastic state after being stirred by adding water.
Preferably, the speed of uniform stirring in the step (4) is 60-70r/min, and the stirring time is 15-20 min.
According to the anti-cracking polyvinyl alcohol green ultra-light base material, the raw material polyvinyl alcohol powder improves the cohesive force among soil particles of the base material, has remarkable effects on improving the bonding strength, integrity, bending toughness and abrasion resistance of a soil body and the cohesive force between the soil body and fibers, and can reduce permeability and contractibility.
According to the anti-cracking polyvinyl alcohol green ultra-light base material, the anti-cracking property, toughness and brittle failure mode of the base material are improved by the PVA fiber serving as the raw material, the soil body is prevented from being suddenly damaged, the water and soil loss of the side slope is effectively prevented, and the durability of the base material is improved.
According to the anti-cracking polyvinyl alcohol green ultra-light base material, the PVA fiber serving as the raw material is matched with the gelling agent, the filler, the defoaming agent and other materials, so that the quality of the base material is reduced, and the self weight of the base material is reduced.
The phthalocyanine green pigment can provide green elements for the slope before vegetation germination, and the anti-crack polyvinyl alcohol green ultra-light base material has a landscape effect while avoiding visual fatigue caused by a dark base material.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the anti-cracking polyvinyl alcohol green ultra-light base material not only meets the strength requirement for ecological slope protection, but also has a series of advantages of crack resistance, impermeability, scouring resistance, ultra-light weight, attractive appearance and the like, can reduce slope load, can prevent slope protection plants from dying due to water and soil loss, provides green elements for the slope before vegetation germination, avoids visual fatigue caused by dark base materials, has a landscape effect, and is a novel green, environment-friendly, economical and applicable composite material.
Detailed Description
The applicant will now further describe the technical solution of the present invention in detail with reference to specific examples. It will be understood that the examples are for the purpose of further illustrating the subject invention and should not be construed in any way as limiting the scope of the invention.
In the following examples, the mixer was purchased from Longjun chemical machinery, Inc. of Laizhou, model 5L-1000L; the reading microscope is purchased from Beijing century science and instruments ltd, and has the model number of JC4-10 series; the impermeability instrument is purchased from Tianjin Xin Gaowei science and technology Limited and has the model of SS-15; the polyvinyl alcohol powder is purchased from Hebei Shenpeng chemical company Limited, the product brand is PVA17-88, the average polymerization degree is 1700-1800DP, the molecular weight is 88000, the alcoholysis degree is 88 percent, and the viscosity is 24 mPa.s; the PVA FIBER is purchased from Shenzhen Yizhen net engineering materials Limited, the model is PVA FIBER W1, 9mm grade (indicating length), the FIBER diameter is 15 mu m, and the density is 1.3g/cm3The tensile strength is 1200MPa, the elastic modulus is 35GPa, the tensile limit is 6-8%, the single fiber fineness is 2.0dtex, and the melting point is 230 ℃; the white carbon black is purchased from Yichanghui silicon-rich materials Co Ltd, and has model number of HB-135, average particle diameter of 45 μm, and tap density of 50g/dm3Carbon content 5%; the modified silicone polydimethylsiloxane high-efficiency defoaming agent emulsion is purchased from Defeng defoaming agent Co., Ltd, Dongguan, model DF-825; the glycerol is purchased from Biotechnology GmbH of Shanghai Yuanmu, with the product number of YM-C1861; the isothiazolinone solution is purchased from Yongbang water supply materials Co., Ltd, of which the model is 567891416666748253; the curing box is purchased from Hebei Kelai analysis instruments and equipment Co Ltd, and has model of YH-20B; the rest are conventional instruments and reagents.
Examples 1-8 are examples of methods for preparing substrates.
Example 1:
a preparation method of an anti-crack polyvinyl alcohol green ultra-light base material comprises the following steps:
(1) taking sludge raw material soil of the river channel of the Wuhan patrol department, placing the soil in an oven for drying, and sieving the soil by a sieve of 1mm for later use;
(2) taking 200g of the raw material soil sieved in the step (1), adding 30g of 42.5-grade ordinary portland cement (the mass fraction is 15%, which accounts for the mass fraction of the raw material soil, the same below) of a curing agent, and uniformly mixing;
(3) adding 140g of water (the mass fraction is 70%) into the mixture obtained in the step (2), and then uniformly stirring in a stirrer at the speed of 110 r/min;
(4) sequentially adding polyvinyl alcohol powder, PVA fiber, a gelling agent, a filler, a defoaming agent, a wetting agent, a preservative and pigment into the mixture obtained in the step (3) according to a certain mixing proportion, and then uniformly stirring for 15min at a speed of 70r/min in a stirrer to form an anti-crack polyvinyl alcohol green ultra-light base material; the polyvinyl alcohol powder adopts the specifications of the polymerization degree of 1700DP, the molecular weight of 88000, the alcoholysis degree of 88 percent and the viscosity of 24mPa.s, and the mixing amount is 6g (the mass fraction is 3 percent); the PVA fiber is 9mm grade, has the diameter of 15 mu m, is light yellow in appearance and has the density of 1.3g/cm3The elastic modulus is 35GPa, the tensile strength is 1200MPa, the tensile limit is 7 percent, the melting point is 230 ℃, the single fiber fineness is 2.0dtex, and the mixing amount is 4g (the mass fraction is 2 percent); the gelatinizer adopts borax, is white powder with colorless crystals in appearance, is easily soluble in water, and has a density of 1.69g/cm3The molecular weight is 381.37, the boiling point is 1575 ℃, and the mixing amount is 0.6g (the mass fraction is 0.3%); the filler has an average particle diameter of 45 μm and a tap density of 50g/dm312g of white carbon black with 5 percent of carbon content (the mass fraction is 6 percent); the defoaming agent is modified silicon polydimethylsiloxane high-efficiency defoaming agent emulsion, the appearance of the defoaming agent is white emulsion liquid, the pH value is 8, the active matter content is 25wt%, the viscosity is 1400mPa.s, the defoaming agent is non-ionic, and the mixing amount of the defoaming agent is 1.2g (the mass fraction is 0.6%); the wetting agent is sterile 20wt% glycerol, and has a relative density of 1.285g/cm392.09, the mixing amount is 4g (mass fraction is 2%); the antiseptic is isothiazolinone solution with active matter content of 14wt% and density of 1.25g/cm3The molecular weight is 115.15, the pH value is 3, the melting point is 255 ℃, and the mixing amount is 0.4g (the mass fraction is 0.2%); the pigment is phthalocyanine green with the density of 2.7g/cm3The mixing amount is 12g (mass fraction is 6%).
Example 2:
a preparation method of an anti-crack polyvinyl alcohol green ultra-light base material is provided, except that no PVA fiber is added in the step (4); the rest is the same as in example 1.
Example 3:
a preparation method of an anti-crack PVA fiber green ultra-light base material is provided, except that no polyvinyl alcohol powder is added in the step (4); the rest is the same as in example 1.
Example 4:
a preparation method of an anti-crack polyvinyl alcohol green ultra-light base material is provided, except that the doping amount of polyvinyl alcohol powder added in the step (4) is 4g (mass fraction is 2%); the rest is the same as in example 1.
Example 5:
a preparation method of an anti-crack polyvinyl alcohol green ultra-light base material is provided, except that the mixing amount of polyvinyl alcohol powder added in the step (4) is 2g (mass fraction is 1%); the rest is the same as in example 1.
Example 6:
a preparation method of an anti-crack polyvinyl alcohol green ultra-light base material is provided, except that the blending amount of PVA fiber added in the step (4) is 2g (mass fraction is 1%); the rest is the same as in example 1.
Example 7:
a preparation method of anti-crack polyvinyl alcohol base material is provided, except that no gelling agent, filler, defoaming agent, wetting agent, preservative and pigment are added in the step (4); the rest is the same as in example 1.
Example 8:
a preparation method of a green base material is provided, except that polyvinyl alcohol powder and PVA fiber are not added in the step (4); the rest is the same as in example 1.
Tests 1-4 are performance tests of the substrates prepared in examples 1-8 above.
Test 1 is a cracking resistance test of the substrates prepared in the preparation method examples except example 7 (table 1 is a cracking resistance test data table).
TABLE 1 crack resistance test data
According to JC/T95-2005, the substrates prepared in seven preparation method examples except example 7 were divided into 3 layers, each layer was compacted by 25 strokes and loadedIn a sample applicator (610 mm. times.924 mm. times.19 mm). After the sample was poured, a 1000W iodine tungsten lamp was placed 1.5m above the sample, and the lamp was turned off after 4 hours of light irradiation, and an electric fan was used to blow the sample for 24 hours to allow rapid dehydration. And then measuring the width and the length of the crack of the sample by using a reading microscope, dividing the sample into four types of more than 3mm, 2-3 mm, 1-2 mm and 0-1 mm according to the width of the crack, defining the measurement indexes of the sample to be 3, 2, 1 and 0.5 respectively according to the width of the crack, and adding the measurement indexes multiplied by the corresponding length of the crack to obtain the shrinkage crack index of the sample. The crack index control rate is K ═ 1-m/m0) X 100% where m is the shrinkage crack index of the substrates prepared in the six preparation method examples except example 7 and example 8, and m is0The shrinkage crack index of the green substrate prepared for the preparation method of example 8. The shrinkage crack index of the base material of example 8 is 140, the shrinkage crack index and the crack index control rate of the base materials of examples 2 and 3 are 91, 35%, 56 and 60% respectively, and it can be seen that the crack index control rate of the base material of example 2 is improved compared with that of example 8 after polyvinyl alcohol powder is added; compared with example 8, the crack index control rate of the base material of example 3 is greatly improved after the PVA fiber is added. The shrinkage crack index and the crack index control rate of the samples 5, 4 and 1 are respectively 28, 80%, 14, 90%, 3 and 97%, and it can be seen that when the gradient mixing amount of the polyvinyl alcohol powder is 1%, 2% and 3%, compared with the sample 8, the crack index control rate and the mixing amount of the base material are in positive correlation and are greatly improved; the shrinkage crack index and crack index control rate of examples 6 and 1 were 46% and 67% respectively, and 3% and 97% respectively, and when the gradient blending amount of the PVA fiber was 1% and 2%, the crack index control rate and the blending amount of the substrate were in positive correlation and were greatly improved as compared with example 8. And the polyvinyl alcohol powder is matched with PVA fiber to be applied to the base material, and the crack resistance of the base material is obviously better than that of the base material in which the two materials are independently applied.
Test 2 is a permeation resistance test of the substrates prepared in the preparation method examples except example 7 (table 2 is a permeation resistance test data table).
Table 2 impermeability test data.
According to GBJ82-85, the base materials prepared in seven preparation method examples except example 7 are divided into 3 layers, each layer is compacted by 25 strokes and is loaded into a sample preparation device (the upper opening diameter is 70mm, the lower opening diameter is 80mm, and the height is 30mm), the prepared sample and the sample preparation device are put into a standard curing box for curing, the curing temperature is (20 +/-2) DEG C, the relative humidity is more than 95%, and the demolding is carried out for continuous curing after 24 hours of curing; and curing to 28 days of the design age, taking out, airing the surface, coating a layer of molten sealing material on the side surface of the sample, pressing the sample into a sample sleeve preheated by an oven on a screw or other pressurizing devices, slightly cooling, releasing the pressure, and sleeving the sample and the sample on an impermeability instrument. The impervious water pressure is adjusted to 0.8MPa, and the test is stopped after stabilizing the pressure for 24 hours. The samples were taken out separately and the water penetration height of the substrate was measured. The water penetration height of the substrate in example 8 is 20mm, and the water penetration heights of the substrates in examples 2 and 3 are 16mm and 10mm respectively, so that compared with example 8, the water penetration height of the substrate in example 2 is reduced by 20% and the water penetration height is reduced to a certain extent after polyvinyl alcohol powder is added; compared with example 8, the water seepage height of the base material in example 3 is reduced by 50% after the PVA fiber is added, and the water seepage height is greatly reduced. The water seepage heights of the substrates of examples 5, 4 and 1 are respectively 8mm, 5mm and 3mm, and it can be seen that when the gradient doping amount of the polyvinyl alcohol powder is 1%, 2% and 3%, the water seepage heights of the substrates of examples 5, 4 and 1 are respectively reduced by 60%, 75% and 85% compared with example 8, and the water seepage heights are inversely related to the doping amount and are greatly reduced; the water penetration heights of the base materials of the examples 6 and 1 are respectively 9mm and 3mm, when the gradient doping amount of the PVA fiber is 1 percent and 2 percent, compared with the example 8, the water penetration heights of the base materials of the examples 6 and 1 are respectively reduced by 55 percent and 85 percent, and the water penetration heights are inversely related to the doping amount and are greatly reduced. And the PVA fiber matched with the polyvinyl alcohol is applied to the base material, and the impermeability of the base material is obviously better than that of the two materials which are independently applied to the base material.
Test 3 is an example of the anti-scour test of the substrates prepared in the preparation method examples except example 7 (table 3 is an anti-scour test data table).
Table 3 anti-scour test data.
According to the research on scouring resistance of semi-rigid base material of Saxietian, Huli group and the laboratory of the scouring resistance of the semi-rigid base material [ J ]. Chinese Highway school newspaper, 2002 (2) ", the base materials prepared by seven preparation method examples except the example 7 are divided into 3 layers respectively, each layer is compacted by 25 strikes and is loaded into a sample preparation device (the diameter is 150mm, the height is 150mm), the prepared sample and the sample preparation device are put into a standard curing box for curing, the curing temperature is (20 +/-2) DEG C, the relative humidity is more than 95%, and the demolding is carried out for continuous curing after 24 hours; and after the mixture is maintained for 28 days of the design age, the mixture is taken out and placed in a container full of water for soaking for 24 hours. For antiskid and buffering, the bottom of the round container is polished once by coarse sand paper, double-layer geotextile is padded, and the double-layer geotextile is placed in the middle of the concrete vibration table. Then the sample is put into a container, water is added into the container, the water level is just over the top of the sample, and if the water level is lower than the top of the sample in the vibration process, water can be supplemented properly. Vibrating for 1min after the water temperature in the container is 22 deg.C, and repeating for 30 times intermittently. The frequency of the vibration table is 2860 times/min, and the amplitude is 0.3-0.6 mm. And (3) after the sample subjected to the scouring test is suspended and rinsed in water in the container, filtering the water in the container by using the geotextile which is cut, dried and weighed in advance, and keeping the base material obtained by scouring on the geotextile for drying. And placing the filtered geotextile and the scoured base material in a drying vessel, drying and weighing in a drying oven, wherein the difference between the mass of the geotextile and the mass of the geotextile dried and weighed originally is the mass of the scoured material. The mass of the material for brushing the base material in example 8 is 40g, and the mass of the material for brushing the base materials in examples 2 and 3 is 27g and 20g respectively, so that compared with example 8, the mass of the material for brushing the base material is reduced by 32% and the mass of the material for brushing is greatly reduced after polyvinyl alcohol powder is added; compared with example 8, the mass of the material of the base material which is washed is reduced by 50% after the PVA fiber is added, and the mass of the material which is washed is greatly reduced. The mass of the material for washing the base material in examples 5, 4 and 1 is 14g, 11g and 7g respectively, and it can be seen that when the gradient mixing amount of the polyvinyl alcohol powder is 1%, 2% and 3%, the mass of the material for washing the base material in examples 5, 4 and 1 is respectively reduced by 65%, 72.5% and 82.5% compared with that in example 8, the mass of the material for washing is in negative correlation with the mixing amount and is greatly reduced; the mass of the material of the base material washed in examples 6 and 1 was 13g and 7g, respectively, and when the gradient blending amount of the PVA fiber was 1% and 2%, the mass of the material of the base material washed in examples 6 and 1 was reduced by 67.5% and 82.5%, respectively, compared with that of example 8, and the mass of the material washed was negatively correlated with the blending amount and was greatly reduced. And the polyvinyl alcohol is matched with PVA fiber to be applied to the base material, and the scouring resistance of the polyvinyl alcohol-PVA fiber is obviously superior to that of the two materials which are independently applied to the base material.
Test 4 is an example of unconfined compressive strength testing of substrates prepared according to preparation method examples 1-8 (Table 4 is a table of unconfined compressive strength testing data).
Table 4 unconfined compressive strength test data.
According to JTJ051-93, dividing the base materials prepared by the preparation method examples 1-8 into 3 layers respectively, compacting each layer by 25 strokes and filling the layers into a sample preparation device (the diameter is 39.1mm, the height is 80.0mm), putting the prepared sample and the sample preparation device into a standard curing box for curing, wherein the curing temperature is (20 +/-2) DEG C, the relative humidity is more than 95 percent, demolding and continuing curing after curing for 24 hours; and after the mixture is maintained for 28 days of the design age, the mixture is taken out and weighed respectively. The mass of the substrates in examples 1 and 7 was 53g and 90g, respectively. The quality of the base material is improved by 70 percent due to the lack of gelling agent, filler, defoaming agent, wetting agent, preservative and pigment material; the mass of the base materials in examples 1, 2 and 3 was 53g, 63g and 55g, respectively, and it can be seen that the mass of the base material remained substantially unchanged compared with example 8 after the polyvinyl alcohol powder was added; after the PVA fibers were added, the mass of the substrate was reduced by 14% and the mass of the substrate was slightly reduced compared to example 8. The base materials of examples 5, 4 and 1 have mass of 52g, 54g and 53g respectively, and it can be seen that when the gradient doping amount of the polyvinyl alcohol powder is 1%, 2% and 3%, the base material has no relation with the doping amount compared with example 8; the mass of the substrates in examples 6 and 1 was 58g and 53g, respectively, and when the gradient blending amount of the PVA fibers was 1% and 2%, the mass of the substrates in examples 6 and 1 was reduced by 9% and 17%, respectively, as compared with that in example 8, and the mass of the substrate and the blending amount were in a negative correlation, and the mass of the substrate was slightly reduced. Unconfined compressive strength tests were conducted and the substrates prepared in examples 1-8 were measured to have unconfined compressive strengths of 480kPa, 484kPa, 486kPa, 482kPa, 481kPa, 483kPa, 650kPa, 490kPa, in that order. Compared with the example 1, the unconfined compressive strength of the base material is improved by 35 percent and the strength of the base material is greatly improved after the base material lacks the gelling agent, the filler, the defoaming agent, the wetting agent, the preservative and the pigment material; and whether the polyvinyl alcohol powder and the PVA fiber are applied to the base material has little influence on the unconfined compressive strength of the base material, and the influence can be almost ignored.
It should be noted that the above-described embodiments may enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way. Thus, it will be appreciated by those skilled in the art that the invention may be modified and equivalents may be substituted; all technical solutions and modifications thereof which do not depart from the spirit and technical essence of the present invention should be covered by the scope of the present patent.
Claims (1)
1. The anti-cracking polyvinyl alcohol green ultra-light base material is characterized by comprising the following components: polyvinyl alcohol powder, PVA fiber, a gelling agent, a filler, a defoaming agent, a wetting agent, a preservative, a pigment, raw material soil, a curing agent and water; wherein, the mixing amount is calculated by the mass percentage of the raw material soil, the mixing amount of the polyvinyl alcohol powder is 1-3%, the mixing amount of the PVA fiber is 1-2%, the mixing amount of the gelling agent is 0.05-0.3%, the mixing amount of the filler is 2-6%, the mixing amount of the defoaming agent is 0.3-0.6%, the mixing amount of the wetting agent is 1-2%, the mixing amount of the preservative is 0.05-0.2%, the mixing amount of the pigment is 4-6%, the mixing amount of the curing agent is 5-15%, and the mixing amount of the water is 65-80%;
the polyvinyl alcohol powder adopts the following specifications: the average polymerization degree is 1700-1800DP, the molecular weight is 84000-124000, and the alcoholysis degree is 87-99 percent;
the PVA fiber is of 9mm grade;
the gelling agent adopts borax;
the filler has a particle size of 2-100 μm and a density of 40-60g/dm3The white carbon black of (1);
the defoaming agent is a modified silicon polydimethylsiloxane high-efficiency defoaming agent emulsion with the active matter content of 25 wt%;
the wetting agent adopts sterile 20wt% of glycerol;
the preservative adopts isothiazolinone solution with 14wt% of active matter content;
the pigment adopts phthalocyanine green;
the raw material soil is riverway mucky soil;
the curing agent is 42.5-grade portland cement;
the preparation method of the anti-crack polyvinyl alcohol green ultra-light base material comprises the following steps:
(1) taking raw soil, placing the raw soil in an oven for drying, and sieving the raw soil by a 1mm sieve for later use;
(2) adding a curing agent into the raw material soil sieved in the step (1), and uniformly mixing;
(3) adding water into the mixture obtained in the step (2), and then uniformly stirring in a stirrer;
(4) sequentially adding polyvinyl alcohol powder, PVA fibers, a gelling agent, a filler, a defoaming agent, a wetting agent, a preservative and a pigment into the mixture obtained in the step (3), and uniformly stirring in a stirrer at a constant speed to form an anti-crack polyvinyl alcohol green ultra-light base material;
the stirring speed in the step (3) is 105-120 r/min;
the speed of uniform stirring in the step (4) is 60-70r/min, and the stirring time is 15-20 min.
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| CN101648789A (en) * | 2008-08-15 | 2010-02-17 | 宁波松鹤文具有限公司 | Light color clay and production method thereof |
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