CN1831067A - Flame-retardant type polyurea anti-corrosion coating for chemical industry steel structure and its prepn. process - Google Patents
Flame-retardant type polyurea anti-corrosion coating for chemical industry steel structure and its prepn. process Download PDFInfo
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- CN1831067A CN1831067A CN 200510110358 CN200510110358A CN1831067A CN 1831067 A CN1831067 A CN 1831067A CN 200510110358 CN200510110358 CN 200510110358 CN 200510110358 A CN200510110358 A CN 200510110358A CN 1831067 A CN1831067 A CN 1831067A
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Abstract
This invention relates to inflaming retarding style polyurea anticorrosion paint used in toughening construction and its manufacturing technique, it belongs to anticorrosion technique field. Its features are that high viscosity half performed polymer synthesized by MDI polyisocyanate and polyether glycol and high content MDI polyisocyanate, fire retardant to make up A group, and A group with end amino group polyether, polyamine style enlarge chain agent, auxiliary agent, fire retardant, colorant make up R group. It is sprayed onto steel surface to form polyurea elastic painting with excellent mechanical property, fire retardant, acid and alkali corrosion resistant and long using life. Normal defect is avoided, it can be widely used to anti-corrosion of steel making equipment and steel configuration bracket of petrochemical, bio-chemical industry, also it can be used to ship inner cabin, shell, deck anticorrosion and anti-slip field.
Description
Technology neck city: belonging to the chemical anticorrosion technical field, exactly is a kind of flame retardant type protective system.
Background technology: chemical industry has corrodibility and flammable raw material in a large number owing to using in process of production, its employed equipment, pipeline, factory building, steel construction, according to the requirement of anti-diluted acid, diluted alkaline, salt, oil corrosion performance and flame retardant properties, select suitable material and anticorrosion process.At present, the impregnating material of selecting in the industry is mainly rubber lining in the equipment, the equipment exterior paint is anticorrosion, perhaps selects the protector of being made by the special nonmetal impregnating material for use, all there is variety of issue in these, are mainly: as using equipment liner rubber, because of rubber adopts splicing, just there is post cure, and complex process, though erosion resistance is strong, versatility is poor, splicing seams is arranged between rubber plate, also easy to leak, rubber plate and hardware be combined into adhesive bond, intensity is limited; As make to paint and anticorrosionly also exist: paint film is thin, is generally 20～50 μ m (dry film), and permeability resistance is poor; Acid-and base-resisting, brine corrosion protection period weak point need painting rotproofing again every year once, and be time-consuming costly again; As use the special nonmetal impregnating material, though the good complex manufacturing technology of antiseptic property, maintenance difficult, and use cost height, all there is the big defective of corrosive medium limitation in the above simultaneously impregnating material that adopts.
Summary of the invention: it is simple to the invention provides a kind of spraying coating process, and heat-transfer effect is good, does not have seam, can seepage yet, and bonding force is strong, a kind of flame-retardant type polyurea anti-corrosion coating of chemical industry steel structure and its manufacturing process of being used for that the anticorrosion cycle is long.
The technical scheme that the present invention takes: adopt by MDI polyisocyanates and polyether glycol synthetic semi-prepolymer and high-content MDI polyisocyanates, fire retardant to constitute the A component and constitute the R component by Amino Terminated polyether(ATPE), polyamines class chainextender, auxiliary agent, fire retardant, colorant;
Its weight ratio is:
A component: form by 50～80 parts of mixed aromatic polyisocyanates and 20～50 parts low functionality polyether glycols, viscosity-depression agent, fire retardants;
The R component: by 35～65 parts of Amino Terminated polyether(ATPE)s, 20～55 parts of amine chain extender, 10～20 parts of fire retardants, 5～15 parts of additives that auxiliary agent, oxidation inhibitor, flow agent, pigment, filler constitute; And coating material solidified with the bicomponent normal temperature of Resins, epoxy Ammonia solidifying agent composition, make anti-corrosion primer; Solidifying guarantor's look coating by acrylic resin, aliphatic isocyanates solidifying agent bicomponent normal temperature is finish paint.
Aromatic polyisocyanate is by 2, the 4-diphenylmethanediisocyanate, 4, the 4-diphenylmethanediisocyanate, the many phenyl isocyanate of polynary methyl, 4 of carbodiimide modification, 4-diphenylmethanediisocyanate, to the desirable usefulness of wherein mixing of tetramethyl-benzene methylene diisocyanate, its functionality is controlled to be 1.8～2.2.
Polyether glycol is an end hydroxy polyether, adopt polyoxytrimethylene ethoxylated polyhydric alcohol (PPG-series), polytetrahydrofuran polyvalent alcohol (PTHF-series), the poly-epsilon-caprolactone polyvalent alcohol, polybutadiene polyol and polyols that carry secondary oh compound, choose wherein to mix and use, hydroxyl equivalent is between 500～1000, and its functionality is between 1.8～2.5.
Auxiliary agent is a viscosity-depression agent, selects dibutyl phthalate, propylene carbonate, carbonic acid third ethyl ester for use.
Fire retardant is liquid organophosphorus, selects DMMP for use, polyphosphoric acid amine.
Amino Terminated polyether(ATPE) is the amino-terminated polyalkylene oxide hydrocarbon compounds of brothers, selects for use the trade mark to be:
T-3000、T-5000、D2000、T-403。
Amine chain extender is an aromatic liquid family diamine chain stretching agent, select diethyl toluene diamine (DETDA), diformazan sulfenyl tolylene diamine (DMTDA), 2 for use, 4-diamino-3,5-diformazan sulfenyl chlorobenzene, N, N-dialkyl methyl diamines (Unilink 4200), 3,3-diethyl-4,4-diaminodiphenylmethane, 4,4-diaminodiphenyl-methane.
Fire retardant is that organophosphorus is solid and liquid flame retardant, selects red phosphorus, tricresyl phosphate (2-chloroethene) ester (TCEP) tricresyl phosphate (2-chlorine different third) ester (TCPP), methyl-phosphoric acid dimethyl ester (PMMP), polyphosphoric acid amine for use.
Auxiliary agent is antioxidant, light absorber, flow agent.
The polyurea elastomer coating characteristics are:
In A, R two components, the ratio of isocyanate group and isocyanate-reactive group is 0.95～1.20; Volume ratio is 1: 1; By spray process, generation polyurea elastomer.
Manufacturing process is respectively:
The manufacturing process of A component:
(1) will add after the polyether glycol high-temperature vacuum dehydrated cooled in the scale tank;
(2) the mixed aromatic isocyanic ester with metering adds in the reactor, inflated with nitrogen protection in the still, and 60～80 ℃ of reactor heating drip the polyether glycol in the scale tank, 60～70 ℃ of temperature of reaction, 1～3 hour dropping time under the stirring at low speed state;
(3) dropwise, 65～80 ℃ of temperature of reaction are incubated 2.5～5 hours, and free isocyanate is surveyed in sampling, and (NCO) content is 10～15%, blowing after postcooling is lower than 60 ℃;
(4) add polyisocyanates, fire retardant, viscosity reduction auxiliary agent, (NCO) content is 13～22%, and it is 400～1500CPS that viscosity meets 25 ℃ of viscosity, makes A component semi-prepolymer, the barrelling nitrogen-filled packaging to make free isocyanate groups;
The worker of R component:
(1) Amino Terminated polyether(ATPE), pigment dispersing agent, pigment, filler, photometry amount are blended in levigate component color slurry in the sand mill;
(2) with polyamines chainextender, Amino Terminated polyether(ATPE), fire retardant, oxidation inhibitor, flow agent, pigment, filler, pour into after the metering stir in the pill tank survey after 30 minutes the amine value be 12～21%, 25 ℃ of viscosity less than 800CPS after barrelling, nitrogen-filled packaging.
The manufacturing process of coating:
A, R two components under the high-pressure spray gun effect, with 1: 1 volume ratio, under 65-75 ℃ temperature condition, to making the surface, form the polyureas corrosion protection coating at rifle formula mixing section inner impact mixing moment atomizing spraying by transferpump;
Wherein
(1) in A, R two components, the ratio of isocyanate group and isocyanate-reactive group is 0.95～1.20;
(2) volume ratio of A, the described composition of R two components is 1: 1;
(3) A, R two components are by spray process, generation polyurea elastomer.
Positively effect behind enforcement the present invention is:
1) coated material is owing to introduce the special reaction group, and the outstanding and anti-anticorrosion kind of lifting antiseptic property is wide, and suitability is strong, and the anticorrosion cycle is long;
2) coating self has good water lubricating performance, can not increase the chemical reaction resistance to flow, is difficult for adherent fluid;
3) coat-thickness is than the thick 1.0～2.0mm/20 of coating～50 μ m, and the impermeabilisation ability is strong, good seal performance;
4) coated material intensity is good, has suitable rigidity and elasticity, and daily shock resistance, collision, scratch ability are strong;
5) with the bonding force of steel strong (middle adhesive-free);
6) directly spraying of construction, convenient, efficient is high, accidental damage also can be repaired;
7) coat-thickness is thinner than rubber plate, construction 1.5～2mm in the general device, and heat-transfer effect is better than rubber plate, and the anti-high and low temperature performance of temperature resistance sex change energy is good;
8) add fire retardant in the reaction system after, coating has flame retardant properties;
9) polyurea coating adopt primary coat, in be coated with, the effective supercoat color and luster of arrangement and method for construction that face is coated with.
Description of drawings:
Fig. 1: flame-retardant type polyurea anti-corrosion coating A component manufacturing process flow diagram
Fig. 2: flame-retardant type polyurea anti-corrosion coating R component manufacturing process flow diagram
Fig. 3: spraying coating process schema
Embodiment:
Spraying coating process:
1, primary coat
Batching: Resins, epoxy: amido solidifying agent: thinner=100: 23: 15
Mix: mixed in the pill tank 20 minutes
Construction: gas spray gun W-71 or WF-71 type are arranged, source of the gas 0.3～0.4Mpa; Or cylinder roller coating
Coating thickness: 10～20 μ m (dry film)
The dry overcoating time: 4～6 hours
2, polyurea elastomer spraying
Batching: A component (V): R component (V)=1: 1
Carry feed: air lift pump feed, pressure: 0.8～1.0Mpa
Supercharging: hydro-cylinder supercharging, pressure 1.6～2.0Mpa
Mix: the moment contact of High Pressure Gun formula mixing section mixes
65 ± 2 ℃ of A, R component and material temperature controls
Air pressure is carried: 0.8～1.0Mpa
Sprayed coating thickness: 1.0～3.0mm
Gel time: 2～10 seconds
Allow the surface layer overcoating time: 2～4 hours
Use complete spraying machine: Gusmer H20/35 main frame and GX-8 rifle
3, surface layer
Batching: acrylic resin paint: the different hydrogen acid ether of aliphatics=100: 11～12
Mix: mixed in the pill tank 10 minutes
Construction: gas spray gun W-71, bleed pressure: 0.3～0.4Mpa is arranged
Sprayed coating thickness: 20～40 μ m (dry film)
Surface drying time: 2 hours
Embodiment:
Example 1
1, A component:
1.1 aggressiveness
120 parts of N220
20 parts of N210
100 parts of MDI-100
Technology: 100 parts of addings of MDI-100 are filled in the reactor of nitrogen and heat to 60 ℃, in still, drip equivalent and be 500～1000 through 140 parts of the admixtured polyether polyvalent alcohols of high-temperature vacuum dehydration, 20～40 minutes time, dropwise the back 60～85 ℃ of insulations 3.5 hours, can obtain-NCO% is at 10.5～11.5% semi-prepolymer.
1.2 performed polymer
100 parts of accurate performed polymers
30 parts of liquefaction modification MDI
20 parts of MDI-100
20 parts of propylene carbonates
5 parts of fire retardant DMMP
Technology: will put into pill tank after the above-mentioned raw materials accurate measurement, high-speed stirring is disperseed after 30 minutes standby, and temperature is controlled at 40～60 ℃, and survey-NCO% is 15.94%
2, R component:
22 parts of E-100
50 parts of D-2000
4 parts of mill bases
1.0 parts of catalyzer
1.0 parts of auxiliary agents
7 parts of red phosphorus fire retardants
Technology: will put into pill tank after the above-mentioned raw materials accurate measurement, surveying the unhindered amina value after high-speed stirring is disperseed 30 minutes is 15%.
3, the Main physical performance of polyurea elastomer
| Project | Test value |
| Gel time | 2～6 seconds |
| Tensile strength | More than or equal to 8.5Mpa |
| Elongation at break | 250％ |
| Tear strength | 45KN/mm 2 |
| Hardness Shao A | 85±2 |
| Oxygen index | 28 |
Example 2
1, A component:
1.1 accurate performed polymer
100 parts of N210
100 parts of MDI-100
Technology: 100 parts of addings of MDI-100 are filled in the reactor of nitrogen and heat to 60 ℃, in still, drip equivalent and be 500～1000 through 100 parts of the admixtured polyether polyvalent alcohols of high-temperature vacuum dehydration, 20～40 minutes time, dropwise the back 60～85 ℃ of insulations 3.5 hours, can obtain-NCO% is 12.3% accurate performed polymer.
1.2 performed polymer
100 parts of accurate performed polymers
50 parts of liquefaction modification MDI
6 parts of propylene carbonates
Technology: will put into pill tank after the above-mentioned raw materials accurate measurement, high-speed stirring is disperseed after 30 minutes standby, and temperature is controlled at 40～60 ℃, and survey-NCO% is 17.4%
2, R component:
21 parts of E-100
48 parts of D-2000
15 parts of HT-4200
1.5 parts in pigment powder
1.0 parts of catalyzer
1.0 parts of auxiliary agents
14 parts of DMMP
Technology: will put into pill tank after the above-mentioned raw materials accurate measurement, sampling survey unhindered amina value is 16.11% after high-speed stirring is disperseed 30 minutes.
3, the Main physical performance of polyurea elastomer
| Project | Test value |
| Gel time | 1～5 second |
| Tensile strength | More than or equal to 1gMPa |
| Elongation at break | More than or equal to 150% |
| Tear strength | 70KN/mm |
| Hardness Shao D | 50±2 |
| Oxygen index | 28 |
Claims (10)
1, a kind of flame-retardant type polyurea anti-corrosion coating that is used for chemical industry steel structure comprises and can form polyurea elastomer coating, priming paint, and finish paint is characterized in that:
(1) polyurea elastomer coating of Xing Chenging is: constituted the A component and constituted the R component by Amino Terminated polyether(ATPE), polyamines class chainextender, auxiliary agent, fire retardant, colorant by MDI polyisocyanates and polyether glycol synthetic semi-prepolymer and high-content MDI polyisocyanates, fire retardant;
Its weight ratio is:
The A component: by 50～80 parts of mixed aromatic polyisocyanates and 20～50 parts low functionality polyether glycols, viscosity-depression agent, fire retardant,
The R component: by 35～65 parts of Amino Terminated polyether(ATPE)s, 20～55 parts of amine chain extender, 10～20 parts of fire retardants, 5～15 parts of additives that auxiliary agent, oxidation inhibitor, flow agent, pigment, filler constitute;
(2) priming paint: the bicomponent normal temperature that epoxy curing agent is formed solidifies, anti-corrosion primer;
(3) finish paint: solidify guarantor's look coating by acrylic resin, isocyanate-modified bicomponent normal temperature.
2. according to claims 1 described a kind of flame-retardant type polyurea anti-corrosion coating that is used for chemical industry steel structure, it is characterized in that: described aromatic polyisocyanate is by 2, the 4-diphenylmethanediisocyanate, 4,4-diphenylmethanediisocyanate, the many phenyl isocyanate of polynary methyl, 4 of carbonization diamines modification, the 4-diphenylmethanediisocyanate, to using desirable wherein mixing of tetramethyl-benzene methylene diisocyanate, its functionality is controlled to be 1.8～2.2.
3, according to claims 1 described a kind of flame-retardant type polyurea anti-corrosion coating that is used for chemical industry steel structure, it is characterized in that: described polyether glycol is an end hydroxy polyether, adopt the polyoxytrimethylene ethoxylated polyhydric alcohol, the polytetrahydrofuran polyvalent alcohol, the poly-epsilon-caprolactone polyvalent alcohol, polybutadiene polyol and polyols that carry secondary oh compound are chosen wherein to mix and are used, hydroxyl equivalent is between 500～1000, and its functionality is between 1.8～2.5.
4. according to claims 1 described a kind of flame-retardant type polyurea anti-corrosion coating that is used for chemical industry steel structure, it is characterized in that: described auxiliary agent is a viscosity-depression agent, selects dibutyl phthalate, propylene carbonate, carbonic acid third ethyl ester for use.
5. according to claims 1 described a kind of flame-retardant type polyurea anti-corrosion coating that is used for chemical industry steel structure, it is characterized in that: described fire retardant is liquid organophosphorus, selects DMMP for use.
6. according to claims 1 described a kind of flame-retardant type polyurea anti-corrosion coating that is used for chemical industry steel structure, it is characterized in that: described Amino Terminated polyether(ATPE) is the amino-terminated polyalkylene oxide hydrocarbon compounds of brothers, selects for use the trade mark to be: T-3000, T-5000, D2000, T-403.
7. according to claims 1 described a kind of flame-retardant type polyurea anti-corrosion coating that is used for chemical industry steel structure, it is characterized in that: described amine chain extender is an aromatic liquid family diamine chain stretching agent, select diethyl toluene diamine, diformazan sulfenyl tolylene diamine, 2 for use, 4-diamino-3,5-diformazan sulfenyl chlorobenzene, N, N-dialkyl methyl diamines, 3,3-diethyl-4,4-diaminodiphenylmethane, 4, the 4-diaminodiphenyl-methane.
8. according to claims 1 described a kind of flame-retardant type polyurea anti-corrosion coating that is used for chemical industry steel structure, it is characterized in that: described fire retardant is that organophosphorus is solid and liquid flame retardant, selects red phosphorus, tricresyl phosphate (2-chloroethene) ester, tricresyl phosphate (2-chlorine different third) ester, methyl-phosphoric acid dimethyl ester (PMMP), polyphosphoric acid amine for use.
9. according to claims 1 described a kind of flame-retardant type polyurea anti-corrosion coating that is used for chemical industry steel structure, it is characterized in that: described auxiliary agent is antioxidant, light absorber, flow agent.
10, a kind of manufacturing process that is used for the flame-retardant type polyurea anti-corrosion coating of chemical industry steel structure is characterized in that:
The manufacturing process of A component:
(1) will add after the polyether glycol high-temperature vacuum dehydrated cooled in the scale tank;
(2) the mixed aromatic isocyanic ester with metering adds in the reactor, inflated with nitrogen protection in the still, and 60～80 ℃ of reactor heating drip the polyether glycol in the scale tank, 60～70 ℃ of temperature of reaction, 1～3 hour dropping time under the stirring at low speed state;
(3) dropwise, 65～80 ℃ of temperature of reaction are incubated 2.5～5 hours, and free isocyanate is surveyed in sampling, and (NCO) content is 10～15%, blowing after postcooling is lower than 60 ℃;
(4) add polyisocyanates, fire retardant, viscosity reduction auxiliary agent, (NCO) content is 13～22%, and it is 400～1500CPS that viscosity meets 25 ℃ of viscosity, makes A component performed polymer, the barrelling nitrogen-filled packaging to make free isocyanate groups;
The manufacturing process of R component:
(1) Amino Terminated polyether(ATPE), pigment dispersing agent, pigment, filler, photometry amount are blended in levigate component color slurry in the sand mill;
(2) with pour into after polyamines chainextender, Amino Terminated polyether(ATPE), fire retardant, oxidation inhibitor, flow agent, the metering of mill base material stir in the pill tank survey after 30 minutes the amine value be 12～21%, 25 ℃ of viscosity less than 800CPS after barrelling, nitrogen-filled packaging.
The manufacturing process of coating:
A, R two components under the high-pressure spray gun effect, with 1: 1 volume ratio, under 65-75 ℃ temperature condition, to making the surface, form the polyureas corrosion protection coating at rifle formula mixing section inner impact mixing moment atomizing spraying by transferpump;
Wherein:
(1) in A, R two components, the ratio of isocyanate group and isocyanate-reactive group is 0.95～1.20;
(2) volume ratio of A, the described composition of R two components is 1: 1;
(3) A, R two components are by spray process, generation polyurea elastomer.
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