CN108264824B - Solvent-free epoxy coating for high-pressure airless spraying of outer wall of buried steel pipe and preparation method thereof - Google Patents
Solvent-free epoxy coating for high-pressure airless spraying of outer wall of buried steel pipe and preparation method thereof Download PDFInfo
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- CN108264824B CN108264824B CN201810145775.6A CN201810145775A CN108264824B CN 108264824 B CN108264824 B CN 108264824B CN 201810145775 A CN201810145775 A CN 201810145775A CN 108264824 B CN108264824 B CN 108264824B
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- 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
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention provides a solvent-free epoxy coating for high-pressure airless spraying of an outer wall of a buried steel pipe, which comprises a component A and a component B, wherein the component A is prepared from the following raw materials in parts by weight: epoxy resin: 35-45 parts of toughening auxiliary agent: 2-10 parts of a dispersant: 0.3-1.0 part of pigment: 8-15 parts of precipitated barium sulfate: 20-30 parts of wet mica powder: 10-20 parts of an anti-settling additive: 0.2-2.0 parts of defoaming agent: 0.1-1.0 part of glycidyl ether: 1-3 parts, component B: an alicyclic amine-modified polyamide polymer. The coating meets the construction mode of preheating double-pipe feeding high-pressure airless spraying, has the film-forming thickness of 300-2000 mu m by one-time spraying, and has excellent toughness and anti-sagging performance.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a solvent-free epoxy coating for high-pressure airless spraying of the outer wall of a buried steel pipe, and also relates to a preparation method of the coating.
Background
In recent years, with increasing perfection and perfection of environmental protection laws and regulations, countries and people pay more attention to environmental protection concepts, traditional solvent-based coatings are gradually eliminated by markets, and environment-friendly coatings such as water-based coatings, solvent-free coatings, powder coatings and the like gradually become great trends of industrial development. The solvent-free liquid epoxy coating has extremely low VOC content, excellent corrosion resistance and safe construction, conforms to the national development principle of high efficiency, economy, environmental protection, safety and energy conservation, and has very wide application prospect. The method is widely applied to the fields of outer walls of various pipelines, storage tanks, steel structures, chemical plant equipment and the like in the petrochemical industry.
Most of the existing solvent-free epoxy coating products have the problems of poor coating toughness and sagging resistance and the like when the thickness of one-time film forming is large, and domestic improvement methods of the coatings are rarely reported.
Disclosure of Invention
The invention provides a solvent-free epoxy coating for high-pressure airless spraying of the outer wall of a buried steel pipe, which has excellent toughness and sag resistance.
The solvent-free epoxy coating for high-pressure airless spraying of the outer wall of the buried steel pipe is characterized by comprising a component A and a component B, wherein the component A is prepared from the following raw materials in parts by weight:
epoxy resin: 35-45 parts of
Toughening auxiliary agent: 2-10 parts of
Dispersing agent: 0.3 to 1.0 portion
Pigment: 8-15 parts of
Precipitating barium sulfate: 20-30 parts of
Wet mica powder: 10-20 parts of
Anti-settling auxiliary agent: 0.2 to 2.0 portions of
Defoaming agent: 0.1 to 1.0 portion
Glycidyl ether: 1-3 parts of
And (B) component: an alicyclic amine-modified polyamide polymer.
Further, the mass ratio of the component A to the component B is 7: 1.
further, the anti-settling auxiliary agent is a mixture of fumed silica and polyamide wax powder.
Further, the weight portion of the fumed silica is 0.6 portion, and the weight portion of the polyamide wax powder is 0.6 portion.
Further, the epoxy resin is E-51 epoxy resin.
Further, the dispersant is AFCONA-PF 604.
Further, the toughening auxiliary agent is a mixture of SM604 and hydrocarbon petroleum resin.
Further, the mass ratio of the SM604 to the hydrocarbon petroleum resin is 4: 6.
further, the component A is composed of the following raw materials in parts by weight:
e-51 epoxy resin: 38 portions of
The SM 604: 3 portions of
Hydrocarbon petroleum resin: 4.5 parts of
Dispersing agent: 0.5 portion
Pigment: 10 portions of
Precipitating barium sulfate: 29.5 parts
Wet mica powder: 17 portions of
Fumed silica: 0.6 part
Polyamide wax powder: 0.6 part
Defoaming agent: 0.5 portion
Active diluent: 1.5 parts of
And (B) component: an alicyclic amine-modified polyamide polymer.
The preparation method of the solvent-free epoxy coating for high-pressure airless spraying of the outer wall of the buried steel pipe comprises the following steps: according to the raw material formula, sequentially adding epoxy resin, toughening auxiliary agent, dispersing agent, pigment, precipitated barium sulfate, wet mica powder, anti-settling auxiliary agent, defoaming agent and active diluent into a stirring tank, stirring at a high speed of 1200r/min for 30min, pouring into a three-roll grinder for grinding at the grinding temperature of 50-70 ℃, and filtering when the grinding fineness is 80 mu to obtain a component A, wherein the component B is alicyclic amine modified polyamide polymer.
The solvent-free epoxy coating for high-pressure airless spraying of the outer wall of the buried steel pipe has the following beneficial effects:
(1) according to the invention, different curing agents and additives for the coating are screened, and meanwhile, special toughening materials are adopted for compounding, so that the solvent-free epoxy coating for high-pressure airless spraying of the outer wall of the buried steel pipe is successfully prepared, the solvent-free epoxy coating meets the construction mode of preheating double-pipe feeding high-pressure airless spraying, the thickness of a film formed by one-time spraying can reach 300-.
(2) The invention adopts a compound system of polyamide wax powder and fumed silica to control the once film-forming thickness of the product and give consideration to the leveling property of the formed film. The polyamide wax belongs to an organic rheology modifier, a reticular structure is formed by mutual winding of macromolecular chains to have thixotropy, when the shear is applied, the wound molecules are pulled open, the viscosity is reduced, when the shear is stopped, the macromolecules are wound again to cause viscosity rise, as the speed of viscosity recovery is slower, the paint film can flow and level for a longer time, but the sagging is not out of control, so that the polyamide wax has better rheological property, and can still have better leveling property when the paint film is endowed with larger sagging limit thickness; the fumed silica belongs to an inorganic rheological modifier, thixotropy is generated mainly by depending on a hydrogen bond structure, the hydrogen bond is destroyed under the shearing force, the viscosity is reduced, the hydrogen bond structure is formed again after the shearing force is eliminated, the viscosity is recovered, good anti-sagging performance is provided, the hydrogen bond effect in the fumed silica can be weakened when the temperature is increased, and the viscosity is reduced. The two materials are compounded for use, so that good anti-sagging performance can be provided, the viscosity of the product is reduced after the product is heated to a certain temperature, and the effect of convenient construction is achieved. The fumed silica accounts for 0.6 part by weight, the polyamide wax powder has the best effect when the weight part is 0.6 part by weight, and finally the product can reach the thickness of one-time coating film of 300-2000 microns.
(3) Through a large number of dispersant screening tests, the invention finally determines that the polyester modified high molecular compound AFCONA-PF604 is used as the dispersing auxiliary agent, and the application of the dispersing auxiliary agent improves the grinding efficiency of the product, effectively reduces the viscosity of the product, increases the fluidity of the product and hardly influences the anti-sagging performance of the product, thereby ensuring that the good appearance of the product is ensured while the anti-sagging performance of the product reaches 300-2000 microns.
(4) The invention adopts a compounding system of hydrocarbon petroleum resin and SM604 macromolecular bisphenol A epoxy resin to improve the flexibility of the product so as to meet the requirement of bending resistance. The SM604 macromolecular epoxy resin can provide good flexibility due to the characteristics of the molecular structure, has a low epoxy value and low consumption of a curing agent, and can completely participate in a curing reaction so as to achieve good chemical resistance and excellent bending resistance; after being added, the hydrocarbon petroleum resin can be uniformly dispersed in an epoxy matrix to form a molecular composite material, and the whole system is similar to a semi-interpenetrating network, so that the matrix is enhanced, and the flexibility of the matrix is improved. The compounding of the two materials avoids the brittleness of the system caused by the excessive addition of the hydrocarbon petroleum resin, reduces the consumption of the curing agent and saves the cost. Finally, the product can meet the requirement of bending resistance and simultaneously meet good chemical resistance.
Detailed Description
Based on the design idea of the invention, the following will describe in detail the solvent-free epoxy paint for high-pressure airless spraying of the outer wall of the buried steel pipe in combination with specific embodiments:
examples 1 to 3
The solvent-free epoxy coating for high-pressure airless spraying of the outer wall of the buried steel pipe comprises the following raw materials in parts by weight:
the solvent-free epoxy coating for high-pressure airless spraying of the outer wall of the buried steel pipe comprises the following raw materials in parts by weight:
the solvent-free epoxy coating for high-pressure airless spraying of the outer wall of the buried steel pipe in the embodiment 1-3 is prepared by the following method:
adding E-51 epoxy resin, SM604, hydrocarbon petroleum resin, a dispersing agent, titanium dioxide, precipitated barium sulfate, wet mica powder, an anti-settling auxiliary agent, a defoaming agent and an active diluent into a stirring tank in sequence according to a raw material formula, stirring at a high speed of 1200r/min for 30min, pouring into a three-roll grinder for grinding at the grinding temperature of 50-70 ℃, and filtering when the grinding fineness is 80 mu to obtain the component A.
And uniformly mixing the component A and the component B alicyclic amine modified polyamide polymer (Shanghai Junjiang D6640) according to the mass ratio of 7: 1.
The solvent-free epoxy coating for high-pressure airless spraying of the outer wall of the buried steel pipe prepared in examples 1 to 3 was subjected to performance testing, and the test results are shown in the following table:
Claims (8)
1. the solvent-free epoxy coating for high-pressure airless spraying of the outer wall of the buried steel pipe is characterized by comprising a component A and a component B, wherein the component A is prepared from the following raw materials in parts by weight:
epoxy resin: 35-45 parts of
Toughening auxiliary agent: 2-10 parts of
Dispersing agent: 0.3 to 1.0 portion
Pigment: 8-15 parts of
Precipitating barium sulfate: 20-30 parts of
Wet mica powder: 10-20 parts of
Anti-settling auxiliary agent: 0.2 to 2.0 portions of
Defoaming agent: 0.1 to 1.0 portion
Glycidyl ether: 1-3 parts of
And (B) component: an alicyclic amine-modified polyamide polymer;
the anti-settling auxiliary agent is a mixture of fumed silica and polyamide wax powder;
the toughening auxiliary agent is a mixture of SM604 and hydrocarbon petroleum resin.
2. The solvent-free epoxy coating for high-pressure airless spraying of the outer wall of the buried steel pipe as claimed in claim 1, wherein the mass ratio of the component A to the component B is 7: 1.
3. the solvent-free epoxy coating for high-pressure airless spraying of the outer wall of the buried steel pipe as claimed in claim 2, wherein the fumed silica is 0.6 part by weight, and the polyamide wax powder is 0.6 part by weight.
4. The solvent-free epoxy coating for high-pressure airless spraying on the outer wall of the buried steel pipe as claimed in claim 3, wherein the epoxy resin is E-51 epoxy resin.
5. The solvent-free epoxy coating for high-pressure airless spraying on the outer wall of the buried steel pipe as claimed in claim 1, wherein the dispersant is AFCONA-PF 604.
6. The solvent-free epoxy coating for high-pressure airless spraying of the outer wall of the buried steel pipe as claimed in claim 5, wherein the mass ratio of SM604 to hydrocarbon petroleum resin is 4: 6.
7. the solvent-free epoxy coating for high-pressure airless spraying on the outer wall of the buried steel pipe as claimed in claim 6, wherein the component A is prepared from the following raw materials in parts by weight:
e-51 epoxy resin: 38 portions of
The SM 604: 3 portions of
Hydrocarbon petroleum resin: 4.5 parts of
Dispersing agent: 0.5 portion
Pigment: 10 portions of
Precipitating barium sulfate: 29.5 parts
Wet mica powder: 17 portions of
Fumed silica: 0.6 part
Polyamide wax powder: 0.6 part
Defoaming agent: 0.5 portion
Glycidyl ether: 1.5 parts of
And (B) component: an alicyclic amine-modified polyamide polymer.
8. A preparation method of the solvent-free epoxy coating for high-pressure airless spraying of the outer wall of the buried steel pipe as claimed in any one of claims 1 to 7 is characterized in that epoxy resin, toughening aid, dispersant, pigment, precipitated barium sulfate, wet mica powder, anti-settling aid, defoamer and active diluent are sequentially added into a stirring tank according to a raw material formula, stirred at a high speed of 1200r/min for 30min, poured into a three-roll grinder for grinding at a grinding temperature of 50 ℃ to 70 ℃, and filtered when the grinding fineness reaches 80 μm, so that a component A is obtained, and a component B is alicyclic amine modified polyamide polymer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810145775.6A CN108264824B (en) | 2018-02-12 | 2018-02-12 | Solvent-free epoxy coating for high-pressure airless spraying of outer wall of buried steel pipe and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810145775.6A CN108264824B (en) | 2018-02-12 | 2018-02-12 | Solvent-free epoxy coating for high-pressure airless spraying of outer wall of buried steel pipe and preparation method thereof |
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| CN108264824A CN108264824A (en) | 2018-07-10 |
| CN108264824B true CN108264824B (en) | 2020-01-14 |
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| CN109321126B (en) * | 2018-10-17 | 2021-03-30 | 成都天合宏业科技发展有限公司 | Solvent-free heavy-duty anticorrosive paint and preparation method thereof |
| CN114213938A (en) * | 2021-12-30 | 2022-03-22 | 雅涂科技(张家港)有限公司 | Double-component high-film-thickness solvent-free epoxy coating and preparation method and application thereof |
| CN116731592A (en) * | 2023-06-20 | 2023-09-12 | 江苏玉龙泰祜新材料科技有限公司 | Phenolic epoxy paint for welded pipeline and preparation method thereof |
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| US7771468B2 (en) * | 2001-03-16 | 2010-08-10 | Angiotech Biocoatings Corp. | Medicated stent having multi-layer polymer coating |
| CN101987937A (en) * | 2009-08-04 | 2011-03-23 | 海洋化工研究院 | Super-thick film anticorrosion coating of splash zone marine steel structure |
| CN102382553A (en) * | 2011-08-26 | 2012-03-21 | 江苏达胜热缩材料有限公司 | Solvent-free epoxy primer for high temperature corrosion prevention of steel pipeline welded junction position |
| CN102367354A (en) * | 2011-08-26 | 2012-03-07 | 江苏达胜热缩材料有限公司 | Solvent-free epoxy primer for corrosion protection of 3 polypropylene (PP) at craters of steel pipelines |
| CN103254723B (en) * | 2013-05-16 | 2015-08-19 | 华东理工大学 | A kind of no-solvent type natural gas line drag reduction inside courtyard and preparation method thereof |
| CN105017938B (en) * | 2015-07-29 | 2018-05-22 | 洛阳双瑞防腐工程技术有限公司 | It is a kind of for anticorrosive paint of drinking water pipeline and preparation method thereof |
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