CN116376366A - Preparation method of bi-component acrylic emulsion waterproof coating material - Google Patents
Preparation method of bi-component acrylic emulsion waterproof coating material Download PDFInfo
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- CN116376366A CN116376366A CN202310370157.2A CN202310370157A CN116376366A CN 116376366 A CN116376366 A CN 116376366A CN 202310370157 A CN202310370157 A CN 202310370157A CN 116376366 A CN116376366 A CN 116376366A
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- 239000000839 emulsion Substances 0.000 title claims abstract description 83
- 239000011248 coating agent Substances 0.000 title claims abstract description 73
- 238000000576 coating method Methods 0.000 title claims abstract description 73
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 239000000463 material Substances 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 32
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229920001909 styrene-acrylic polymer Polymers 0.000 claims abstract description 26
- 238000002156 mixing Methods 0.000 claims abstract description 24
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims abstract description 21
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims abstract description 21
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 16
- -1 alcohol ester Chemical class 0.000 claims abstract description 14
- 239000007787 solid Substances 0.000 claims abstract description 14
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 12
- 239000000080 wetting agent Substances 0.000 claims abstract description 12
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 238000005303 weighing Methods 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 238000012360 testing method Methods 0.000 description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 43
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 13
- 239000011575 calcium Substances 0.000 description 13
- 229910052791 calcium Inorganic materials 0.000 description 13
- 230000000694 effects Effects 0.000 description 12
- 230000000630 rising effect Effects 0.000 description 11
- 239000002245 particle Substances 0.000 description 10
- 230000009471 action Effects 0.000 description 6
- 239000004570 mortar (masonry) Substances 0.000 description 6
- 239000013530 defoamer Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 4
- 239000002518 antifoaming agent Substances 0.000 description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- 241000276489 Merlangius merlangus Species 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000007888 film coating Substances 0.000 description 2
- 238000009501 film coating Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000011256 inorganic filler Substances 0.000 description 2
- 229910003475 inorganic filler Inorganic materials 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 125000005396 acrylic acid ester group Chemical group 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000011258 core-shell material Substances 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
- C09D125/02—Homopolymers or copolymers of hydrocarbons
- C09D125/04—Homopolymers or copolymers of styrene
- C09D125/08—Copolymers of styrene
- C09D125/14—Copolymers of styrene with unsaturated esters
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a preparation method of a bi-component acrylic emulsion waterproof coating material, which comprises the steps of preparing a solid component, and mixing heavy calcium carbonate and talcum powder according to a mass ratio of 9:1, uniformly mixing and stirring for standby; weighing 92.55 parts of styrene-acrylic emulsion and pure acrylic emulsion which account for liquid components for standby; mixing the styrene-acrylic emulsion and the pure acrylic emulsion, and stirring for 1 minute at 400 revolutions per minute; adding a wetting agent and a sodium hexametaphosphate solution to disperse for 3 minutes at 600 revolutions per minute; then adding alcohol ester twelve to disperse for 1 minute at 400 revolutions per minute; adding a silane coupling agent and dispersing for 1 minute at 400 revolutions per minute; the solid component and the liquid component are mixed according to the mass ratio of 1:0.93 mix at 800 revolutions per minute for 3 minutes; finally, tributyl phosphate is added and dispersed for 1 minute at 200 revolutions per minute, and the preparation is completed.
Description
Technical Field
The invention relates to the field of waterproof coating materials, in particular to a preparation method of a bi-component acrylic emulsion waterproof coating material.
Background
The underground engineering has the characteristics of increasing the erosion effect of underground water along with the burial depth of the building and poor ventilation, and the waterproof coating material prepared from the aqueous acrylic emulsion has good physical and mechanical properties and waterproof and impervious properties, is different from other solvent-type and reactive waterproof coating materials, and has the characteristic of low organic volatile matters. Therefore, the acrylic emulsion waterproof coating material is widely used in underground engineering by virtue of good performance. However, with the development of long-time working of the acrylic emulsion waterproof coating material, the performance requirements of the actual engineering on the acrylic emulsion waterproof coating material are higher and higher. Research shows that the acrylic acid waterproof coating material prepared from the acrylic acid ester polymeric emulsion (pure acrylic emulsion) has good hydrophobicity, but the tensile strength is low due to the too high flexibility, and in addition, the cost of the pure acrylic emulsion in the acrylic acid emulsion is higher; the coating material prepared from the conventional styrene-acrylic ester copolymer emulsion (styrene-acrylic emulsion) has poor waterproof capability, is easy to swell under the erosion action of water and has no waterproof effect, but has better tensile strength than the coating material prepared from the pure acrylic emulsion. In order to enhance the performance of the acrylic emulsion waterproof coating material, the production cost of the acrylic emulsion waterproof coating material is higher and higher. Therefore, research on improvement of waterproof and impervious properties, physical and mechanical properties and reduction of production cost of the acrylic emulsion waterproof coating material is necessary. At present, modified acrylic emulsion, such as core-shell acrylic emulsion or acrylic emulsion with other groups introduced, is mainly used as the waterproof coating material for improving the acrylic emulsion.
The coating developed by the method can obtain better effect on working performance, but the novel acrylic emulsion is complex to synthesize, has multiple related factors, large technical difficulty and poor economy, and simultaneously brings great challenges to large-scale popularization and application of the acrylic emulsion waterproof coating. Therefore, the low cost and high performance are key to the popularization and application of the acrylic emulsion waterproof coating material.
Disclosure of Invention
First, the technical problem to be solved
In order to overcome the defects of the prior art, the preparation method of the bi-component acrylic emulsion waterproof coating material is provided, the production cost is reduced, the waterproof and impervious performances are greatly improved, and the production technical difficulty of enterprises is reduced.
(II) technical scheme
The invention is realized by the following technical scheme: the invention provides a preparation method of a bi-component acrylic emulsion waterproof coating material, which is characterized by comprising the following steps of: the method comprises the following steps:
s1: preparing a solid component, namely mixing heavy calcium carbonate with talcum powder according to the mass ratio of 9:1, uniformly mixing and stirring for standby;
s2: weighing 92.55 parts of styrene-acrylic emulsion and pure acrylic emulsion which account for liquid components for standby;
s3: mixing the styrene-acrylic emulsion and the pure acrylic emulsion, and stirring for 1 minute at 400 revolutions per minute; adding a wetting agent and a sodium hexametaphosphate solution to disperse for 3 minutes at 600 revolutions per minute; then adding alcohol ester twelve to disperse for 1 minute at 400 revolutions per minute; adding a silane coupling agent and dispersing for 1 minute at 400 revolutions per minute;
s4: the solid component and the liquid component are mixed according to the mass ratio of 1:0.93 mix was dispersed at 800 revolutions per minute for 3 minutes
S5: finally, tributyl phosphate is added to disperse for 1 minute at 200 revolutions per minute, and the preparation is finished.
Further, the liquid component consists of pure acrylic emulsion, styrene acrylic emulsion, wetting agent 0.2 parts, sodium hexametaphosphate aqueous solution 3.75 parts, alcohol ester twelve 2.5 parts, silane coupling agent 0.3 parts and tributyl phosphate 0.7 parts in mass ratio.
(III) beneficial effects
Compared with the prior art, the invention has the following beneficial effects:
(1) When the composite use ratio of the pure acrylic emulsion and the styrene-acrylic emulsion which is not subjected to hydrophobic modification is 0.37, the prepared waterproof coating is watertight under the action of 0.3 megaPa water pressure by a watertight test, has stable physical and mechanical properties, and obviously reduces the production cost.
(2) When the proportion of the pure acrylic emulsion to the styrene acrylic emulsion in the liquid component is 0.37, the proportion of the alcohol ester twelve, the sodium hexametaphosphate solution (mass fraction 5%), the wetting agent, the silane coupling agent and the tributyl phosphate is 2.5 parts, 3.75 parts, 0.2 part, 0.3 part and 0.7 part respectively; the mass ratio of heavy calcium to 1250 mesh talcum powder in the solid component is 9:1, and the liquid-powder ratio is 1: at 0.93, the improvement of the mechanical property of the coating and the mesh number of the heavy calcium carbonate are in positive correlation, and the elongation at break and the tensile strength reach the maximum when 800 mesh heavy calcium carbonate is used, namely 316 percent and 1.11 megapascals respectively. The impermeability is not obvious in the changes of heavy calcium carbonate of 200 meshes, 325 meshes and 600 meshes, and the rising water pressure and the seepage water pressure are sharply improved when the heavy calcium carbonate of 800 meshes is used, namely 1.3 megapascals and 1.4 megapascals respectively.
(3) When the proportion of the pure acrylic emulsion to the styrene acrylic emulsion in the liquid phase component is 0.37, the alcohol ester twelve and sodium hexametaphosphate solution (mass fraction 5%), the wetting agent and the silane coupling agent are respectively 2.5 parts, 3.75 parts, 0.2 part and 0.3 part; the mass ratio of the 800-mesh heavy calcium to the 1250-mesh talcum powder in the solid component is 9:1, and the liquid-powder ratio is 1: and when the content of the tributyl phosphate is 0.93, the tributyl phosphate has an excellent defoaming effect on the waterproof coating of the bi-component acrylic emulsion, and the compactness of the waterproof coating after being dried is improved. The elongation at break of the waterproof coating is positively correlated with the tributyl phosphate with the increased dosage, and reaches 351% at the highest, the tensile strength of the waterproof coating is slightly reduced, and the impermeability is gradually reduced after the rapid increase.
(4) The characteristic of the bi-component acrylic emulsion waterproof coating in the anti-seepage test is that the surface of the waterproof coating bulges under the action of water pressure, and the waterproof coating is continuously pressurized to bulge and crack to permeate water. When the proportion of the pure acrylic emulsion to the styrene acrylic emulsion in the liquid phase component is 0.37, the alcohol ester twelve and sodium hexametaphosphate solution (mass fraction 5%), the wetting agent and the silane coupling agent are respectively 2.5 parts, 3.75 parts, 0.2 part and 0.3 part; the mass ratio of the 800-mesh heavy calcium to the 1250-mesh talcum powder in the solid component is 9:1, and the liquid-powder ratio is 1: when the water pressure for rising the drum is 0.93, the water pressure reaches the maximum value of 1.3 megapascals when the dosage of tributyl phosphate is 0.7 part; the water seepage pressure reaches the maximum at 0.35 part of tributyl phosphate, which is 1.5 megapascals. The coupling relation between the coating and the mortar in the anti-seepage test is different in different formulas, and when the dosage of tributyl phosphate is 1.05 parts and 1.4 parts, the difference between the water seepage pressure and the rising water pressure is the smallest, which is 0 megapascal; the amount of tributyl phosphate used was 0.35 part with the maximum time difference value of 0.8 MPa. When the difference between the water pressure of the bulge and the water pressure of the seepage is obvious, the early warning effect can be achieved for avoiding the occurrence of the water seepage accident of the underground engineering.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides a preparation method of a bi-component acrylic emulsion waterproof coating material, which is characterized by comprising the following steps of: the method comprises the following steps:
s1: preparing a solid component, namely mixing heavy calcium carbonate with talcum powder according to the mass ratio of 9:1, uniformly mixing and stirring for standby;
s2: weighing 92.55 parts of styrene-acrylic emulsion and pure acrylic emulsion which account for liquid components for standby;
s3: mixing the styrene-acrylic emulsion and the pure acrylic emulsion, and stirring for 1 minute at 400 revolutions per minute; adding a wetting agent and a sodium hexametaphosphate solution to disperse for 3 minutes at 600 revolutions per minute; then adding alcohol ester twelve to disperse for 1 minute at 400 revolutions per minute; adding a silane coupling agent and dispersing for 1 minute at 400 revolutions per minute;
s4: the solid component and the liquid component are mixed according to the mass ratio of 1:0.93 mix was dispersed at 800 revolutions per minute for 3 minutes
S5: finally, tributyl phosphate is added to disperse for 1 minute at 200 revolutions per minute, and the preparation is finished.
Further, the liquid component consists of pure acrylic emulsion, styrene acrylic emulsion, wetting agent 0.2 parts, sodium hexametaphosphate aqueous solution 3.75 parts, alcohol ester twelve 2.5 parts, silane coupling agent 0.3% and tributyl phosphate 0.7% in mass ratio.
In the test, the initial proportion is determined by a three-factor four-level orthogonal test, and the water impermeability, tensile strength and elongation at break of each proportion are examined by taking the proportion of the styrene-acrylic emulsion to the pure acrylic emulsion, the percentage of the film forming additive to the liquid component and the percentage of the sodium hexametaphosphate aqueous solution (mass fraction 40%) to the liquid component as three factors of the orthogonal test. The percentages of the wetting agent, the silane coupling agent and the tributyl phosphate in the liquid component are fixed and are respectively 0.2 part, 0.3 part and 0.7 part. The solid components are coarse whiting with 325 meshes and talcum powder with 1250 meshes, and the mass ratio of the coarse whiting to the talcum powder with 9 is as follows: 1. the mass ratio of the liquid component to the solid component (hereinafter referred to as liquid-powder ratio) at this stage is 1:1.
orthogonal test protocol table:
accordingly, the test shows that:
orthogonal test results table:
investigation of tensile strength and elongation at break refers to a China building industry standard polymer emulsion building waterproof coating. Tests are carried out under the standard state (23 ℃ C., relative humidity 50%), and the weight ratio of heavy calcium to talcum powder is 9:1, uniformly mixing for standby; mixing the styrene-acrylic emulsion and the pure acrylic emulsion, and stirring for 1 minute at 400 revolutions per minute; adding a wetting agent and a sodium hexametaphosphate solution to disperse for 3 minutes at 600 revolutions per minute; then adding alcohol ester twelve to disperse for 1 minute at 400 revolutions per minute; then adding a silane coupling agent and dispersing for 1 minute at the rotating speed of 400 revolutions per minute; mixing the solid component with the liquid component for 3 minutes at 800 revolutions per minute; tributyl phosphate was finally added and dispersed for 1 minute at 200 revolutions per minute. The prepared samples were applied to a film frame at two intervals of 24 hours, and the final film thickness was 1.5 mm. Cutting the test piece maintained for 168 hours into a dumbbell shape by using a cutter and a sheet punching machine, measuring the thickness of the test piece by using a thickness gauge, drawing parallel marked lines with a distance of 35 mm on the test piece, and keeping the test piece to be 6 mm wide. The test piece is fixed on a tensile testing machine for testing, and the maximum tensile force and the mark line distance during fracture are recorded. The tensile strength is calculated by dividing the maximum tensile force of the tensile zone by the cross-sectional area of the tensile zone in megapascals. The elongation at break of the test piece is calculated by subtracting the pre-test performance length from the length of the marked line at break of the tensile zone and dividing the calculated length by the pre-test performance length. The waterproof property test and the impermeability test are respectively measured by a waterproof roll impermeability instrument and a mortar impermeability instrument.
Tensile strength limit analysis table for orthogonal test:
orthogonal test elongation at break limit analysis table:
the orthogonal test results are subjected to extremely poor analysis, and the primary and secondary orders of factors affecting the tensile strength and the elongation at break of the waterproof coating are as follows: alcohol ester twelve > pure acrylic emulsion and styrene acrylic emulsion ratio > sodium hexametaphosphate solution.
The analysis shows that the ratio of the pure acrylic emulsion to the styrene acrylic emulsion has obvious influence on the mechanical property of the coating, which is inferior to alcohol ester twelve. When the proportion of the pure acrylic emulsion and the styrene acrylic emulsion is increased, the tensile strength is reduced, and the elongation at break is increased. When the ratio of the pure acrylic emulsion to the styrene acrylic emulsion is too low, the water impermeability test fails. Under the action of water pressure, the coating added with more styrene-acrylic emulsion is easier to swell and is broken by water penetration. When a proper amount of pure acrylic emulsion is added, particles of the pure acrylic emulsion can be stacked among particles of the styrene acrylic emulsion in the drying process of the waterproof coating, so that a good waterproof effect is achieved.
The influence of the sodium hexametaphosphate aqueous solution on the tensile strength and the elongation at break of the waterproof coating is smaller than the proportion of the film forming additive and the pure acrylic emulsion styrene-acrylic emulsion. And one end of the active group of the sodium hexametaphosphate is used as a dispersing agent and can be adsorbed on the surface of the inorganic filler particles, and the other end of the active group of the sodium hexametaphosphate is adsorbed on the emulsion particles to form an adsorption layer, so that charge repulsive force is generated, the inorganic filler is dispersed and suspended to avoid flocculation, and the internal defects of the coating film after drying are reduced.
Finally, considering the comprehensive properties of the waterproof coating material, the 7 th group and the 8 th group have excellent effects on physical and mechanical properties and waterproof properties in the orthogonal test.
Specifically, the heavy calcium carbonate with different mesh numbers affects the performance of the waterproof coating material
Based on the test method, the influence of heavy calcium carbonate of 200 meshes, 325 meshes, 600 meshes and 800 meshes on the tensile strength, the elongation at break, the water impermeability and the impermeability of the heavy calcium carbonate is examined by selecting the 7 th group and the 8 th group which have better physical and mechanical properties and water impermeability in the orthogonal test.
The film coating test is carried out by adopting sodium hexametaphosphate solutions with different mass fractions, whether the film is cracked or not is observed, and the influence of the sodium hexametaphosphate solution on the waterproof coating is small by the orthogonal test range analysis, so that the performance of the film coating of the sodium hexametaphosphate solutions with different mass fractions is not examined. Finally, changing the sodium hexametaphosphate solution with the mass fraction of 40% into the sodium hexametaphosphate solution with the mass fraction of 5%, and changing the liquid-powder ratio into 1:0.93 to reduce certain consistencies.
Tensile strength, elongation at break, water impermeability and permeation resistance were examined for group 7 and group 8 after the formulation was modified by using 200 mesh, 325 mesh, 600 mesh, 800 mesh heavy calcium carbonate.
The test results show that the tensile strength of the coating film is positively correlated with the increase of the mesh number of the heavy calcium, wherein the 7 th group is most obvious in change, the tensile strength is increased from 0.84 megapascals to 1.11 megapascals, and the 8 th group is increased from 0.79 megapascals to 1 megapascals. The elongation at break of the coating film and the improvement of the mesh number of the heavy calcium are in a positive correlation, the maximum change of the 7 th group is obviously improved from 248% to 316%, and the elongation at break of the 8 th group is only 27% different from that of the 800 mesh heavy calcium by using 200 mesh heavy calcium. The tensile strength and the elongation at break of the 7 th group and the 8 th group generally increase, because when the corresponding mesh number of the filler is low, the particle size of the heavy calcium particles is relatively large, the heavy calcium particles cannot be fully wrapped after being mixed with the liquid phase material, and after the water is dried, the emulsion particles are contacted and coalesced to form a loose network structure, so that the tensile strength and the elongation at break are low. When the mesh number of the heavy calcium carbonate becomes high, the dispersed phase heavy calcium carbonate particles can be uniformly dispersed in the liquid phase material to form a compact coating film, so that internal microscopic defects of the polymer after film formation are reduced, and the tensile strength and the elongation at break are improved.
According to the test results, the mechanical properties of the 7 th group coating film are better than those of the 8 th group coating film, so that the 7 th group waterproof test fails except that 800-mesh heavy calcium carbonate is adopted, and the waterproof test results are as follows:
the anti-permeability test results of the 7 th group show that the surface of the waterproof coating bulges under the action of water pressure, and the continuous pressurization bulge breaks the coating to permeate water. With the increase of the mesh number of the heavy calcium, the water-proof coating has the rising water pressure and the seepage water pressure which are generally in the rising trend, the rising water pressure and the seepage water pressure of the coating are not changed greatly when the heavy calcium with 200 meshes, 325 meshes and 600 meshes are used, the maximum rising is 0.3 megapascal, the seepage resistance effect is sharply improved when the heavy calcium with 800 meshes is used, the rising water pressure is increased from 0.5 megapascal to 1.3 megapascal, and the seepage water pressure is increased from 0.8 megapascal to 1.4 megapascal. Because the particle size of the heavy calcium carbonate is continuously reduced, the immersion liquid is increased in the depth of the coating immersed in the mortar before the water is evaporated, the waterproof coating is crosslinked into a film in a certain depth of the mortar, the internal gaps of the mortar surface layer systems which are mutually communicated are reduced, and the caulking and leakage stopping effect of the waterproof coating on the mortar base layer is improved.
Specifically, tributyl phosphate affects the performance of the waterproof coating material
Based on the test method, a single factor test was set with tributyl phosphate blending amount of 0 part, 0.35 part, 0.7 part, 1.05 part, 1.4 parts.
The bubbles in the coating film are obviously reduced along with the increase of the tributyl phosphate dosage. The test pieces with different tributyl phosphate mixing amounts are cut into the sizes of 10 mm multiplied by 10 mm, and the sections of the test pieces are cut by a knife to observe, so that the air bubbles are obviously reduced after the waterproof coating is dried along with the increase of the proportion of the defoamer, and the sections of the coating film have no obvious air bubbles when the defoamer accounts for 1.05 parts and 1.4 parts of the liquid component. Since tributyl phosphate can rapidly diffuse at the interface of the foam, the surface tension of the tributyl phosphate is reduced, and the foam is thinned and finally destroyed. Therefore, when no defoamer is added, the coating has a porous internal structure, and a water seepage channel is generated under the action of water pressure, so that the test piece is water-permeable. Thus, the water-tightness test failed without the addition of defoamer, and the water-tightness test results were as follows:
as a result of the test, the tensile strength of the coating film increases and then decreases with the increase of the blending amount of the antifoaming agent, and when the blending amount of the phosphotriester is 1.4 parts, the tensile strength is the lowest and 0.76 MPa, and when the blending amount of the tributyl phosphate is 0.7 parts, the tensile strength is the highest and 1.11 MPa; the elongation at break of the coating film increased with the amount of tributyl phosphate, and was found to be 256% at a minimum elongation at break when tributyl phosphate was not used, and 351% at a maximum elongation at break when tributyl phosphate was incorporated in an amount of 1.4 parts. When the blending amount of tributyl phosphate is less than 0.7 part, the tensile strength of the coating is mainly determined by the defoaming effect of tributyl phosphate, and the internal microscopic cavities of the coating are reduced, so that the compactness of the coating is improved, and the tensile strength is enhanced. When the blending amount of tributyl phosphate is more than 0.7 part, the tensile strength of the coating film is determined by the effect of tributyl phosphate on increasing plasticity, and the flexibility of the waterproof coating layer is increased and the tensile strength is correspondingly reduced. The compactness of the waterproof coating film is improved while the consumption of the defoaming agent is increased, and the breaking process of the coating test piece at constant-speed stretching is characterized in that the test piece gradually changes into a honeycomb shape from a compact state until the test piece breaks, so that the breaking elongation of the test piece is improved when the internal defects of the coating film are reduced.
In the impermeability test result, the rising water pressure is slightly reduced to 1.1 megapascals after being increased from 0.5 megapascals to 1.3 megapascals, and the seepage water pressure is increased to 1.5 megapascals along with the mixing amount of the antifoaming agent and then gradually reduced to 1.1 megapascals. When the difference between the rising water pressure and the seepage water pressure is large, the waterproof coating has an early warning effect in underground engineering. When the mixing amount of the defoamer is 0.35 part, the rising water pressure of the two-component water-based acrylic ester waterproof coating studied herein is 0.7 megapascal, the water seepage water pressure is 1.5 megapascal, and long early warning time is reserved before the underground engineering encounters a water seepage accident so as to avoid the accident.
The above examples are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the spirit and scope of the present invention. Various modifications and improvements of the technical scheme of the present invention will fall within the protection scope of the present invention without departing from the design concept of the present invention, and the technical content of the present invention is fully described in the claims.
Claims (2)
1. A preparation method of a bi-component acrylic emulsion waterproof coating material is characterized by comprising the following steps: the method comprises the following steps:
s1: preparing a solid component, namely mixing heavy calcium carbonate with talcum powder according to the mass ratio of 9:1, uniformly mixing and stirring for standby;
s2: weighing 92.55 parts of styrene-acrylic emulsion and pure acrylic emulsion which account for liquid components for standby;
s3: mixing the styrene-acrylic emulsion and the pure acrylic emulsion, and stirring for 1 minute at 400 revolutions per minute; adding a wetting agent and a sodium hexametaphosphate solution to disperse for 3 minutes at 600 revolutions per minute; then adding alcohol ester twelve to disperse for 1 minute at 400 revolutions per minute; adding a silane coupling agent and dispersing for 1 minute at 400 revolutions per minute;
s4: the solid component and the liquid component are mixed according to the mass ratio of 1:0.93 mix was dispersed at 800 revolutions per minute for 3 minutes
S5: finally, tributyl phosphate is added to disperse for 1 minute at 200 revolutions per minute, and the preparation is finished.
2. The method for preparing a two-component acrylic emulsion waterproof coating material according to claim 1, characterized in that: the liquid component consists of pure acrylic emulsion and styrene acrylic emulsion with the mass ratio of 0.37, 0.2 part of wetting agent, 3.75 parts of sodium hexametaphosphate aqueous solution, 2.5 parts of alcohol ester twelve, 0.3 part of silane coupling agent and 0.7 part of tributyl phosphate.
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