CN102101964A - Organic silicon modified epoxy heat-resistant and anti-corrosive coating and preparation method thereof - Google Patents
Organic silicon modified epoxy heat-resistant and anti-corrosive coating and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an organic silicon modified epoxy resin coating and a preparation method thereof. The coating consists of a coating main agent A component and a curing agent B component, wherein a coating main agent consists of substrate resin, a pigment-filler, a solvent and an aid; the substrate resin is obtained by modifying epoxy resin E-20 by using a methyl phenyl organic silicon low polymer; the using amount of the substrate resin accounts for 50-55 percent of the weight of the coating main agent; the weight ratio of the methyl phenyl organic silicon low polymer to the epoxy resin E-20 is (11-20):(15-16); the curing agent is polyamide; and the weight ratio of the coating main agent to the curing agent is 100:(7-12). The method comprises the following steps of: undergoing a condensation copolymerization reaction on hydroxyl, amino and alkoxyl in organic silicon resin with hydroxyl in epoxy resin; and grafting organic silicon -Si-O-group into the epoxy resin to obtain the modified epoxy heat-resistant coating with high heat resistance, high corrosion resistance and high paint film property.
Description
Technical field
The invention belongs to the modification of epoxypaint, relate to a kind of modifying epoxy resin by organosilicon coating and preparation method thereof.
Background technology
In recent years, develop rapidly along with new and high technology, requirement to high-temperature-resistant structure material and heat resisting coating is more and more higher, and facts have proved, high-temperature structural material and heat resisting coating will be accomplished existing good hot strength, possess good anti-oxidant, corrosion resistance again and but compare difficulty, and the expense costliness.Though existing epoxypaint has and has many excellent properties, as good anti-oxidant, corrosion resistance, but its thermotolerance is good inadequately, continuous expansion along with the Resins, epoxy range of application, more and more higher to stable on heating requirement, adopting the organosilicon performed polymer that Resins, epoxy is carried out modification is to give one of stable on heating important method of epoxy coating.
Organosilicon comprises physically modified and chemical modification to the modification of Resins, epoxy, because molecular structure, consistency is bad when organosilicon and Resins, epoxy physical blending, and envrionment temperature is above the easy yellowing of Resins, epoxy after 150 ℃, paint film is easy to crack, is difficult to reach the modification purpose.
Summary of the invention
Be difficult to accomplish existing good hot strength in order to solve existing epoxypaint, possess good anti-oxidant, corrosion resistance again, organosilicon is to the problem of the difficult modification of Resins, epoxy.The invention provides a kind of not only high temperature resistant but also erosion-resisting modifying epoxy resin by organosilicon coating and preparation method thereof.
Technical scheme of the present invention is: a kind of organic-silicon-modified epoxy Heat and corrosion resistant coating, form by coating host A component and solidifying agent B component, described coating host is by binder resin, color stuffing, solvent and auxiliary agent are formed, it is characterized in that: described binder resin is got by aminomethyl phenyl organosilicon oligopolymer modified epoxy E-20, its consumption accounts for the 50-55% of coating host weight, the weight ratio of aminomethyl phenyl organosilicon oligopolymer and Resins, epoxy E-20 is 11-20: 15-16, described solidifying agent is a polymeric amide, and the weight ratio of described coating host and solidifying agent is 100: 7～12.
E-20 belongs to middle polymerization degree Resins, epoxy, has more-OH group, uses the organosilicon preformed polymer modification, and graft ratio is easier to, and synthetic back resin property is stable.The adding of auxiliary agent has certain effect for dispersiveness, levelling property, the stability of coating.
Preferably, the weight ratio of described coating host and solidifying agent is 10: 1.
Preferably, described solidifying agent is polyamide curing agent NX2016.Because contain epoxide group in the modifying epoxy resin by organosilicon carbochain, the resin that has determined multiple amine, acid anhydrides and had some active group can make its crosslinking curing.The solidification effect of making solidifying agent with polymeric amide is superior, in film process, mainly open the epoxy group(ing) in the modifying epoxy resin by organosilicon and be cross-linked into macromolecule membrane by the reactive hydrogen on the secondary amine in the polyamide resin, both solidifying with polymeric amide can also can be under the condition of heating in room temperature (3～4 days), it and modifying epoxy resin by organosilicon have compatibility preferably, and pot-life is longer, and paint film has sticking power, impact resistance, elasticity, water tolerance and weathering resistance preferably.Polymeric amide is nontoxic in the film-forming process helps manual operation, and condition of cure is subjected to environment (as moisture, moisture) influence less.
Preferably, described color stuffing is made up of titanium dioxide and mica powder, and wherein the titanium dioxide consumption accounts for the 20-25% of coating host weight, and the mica powder consumption accounts for the 10-12% of coating host weight.The pigment of high-temperature resistant coating is based on metal oxide, and as TiO2, ZnO etc., the present invention also can add rust-stabilising pigment under particular requirement, as zinc phosphate, aluminium triphosphate etc.
Preferably, described solvent is made up of dimethylbenzene, butyl ester and anti-settling agent 201P, and wherein the consumption of dimethylbenzene accounts for 5% of coating host weight, and the consumption of fourth fat accounts for 2.5% of coating host weight, and the consumption of anti-settling agent 201P accounts for the 2-2.5% of coating host weight.
Preferably, described binder resin is by the preparation of following step and get: with dimethylbenzene and pimelinketone as mixed solvent, add organo-metallic salt catalyzer, Resins, epoxy E-20 and organosilicon oligopolymer are at 120～135 ℃ of reaction 3～5h, obtain light yellow transparent liquid, adding an amount of solvent again, to make solid content be 50% solution, promptly gets binder resin; The weight part consumption of each raw material is: aminomethyl phenyl organosilicon oligopolymer 110-200 part, Resins, epoxy E-20150-160 part, 140 parts of dimethylbenzene, 60 parts of pimelinketone, organo-metallic salt catalyzer 0.25-0.75 part.
Preferably, described organo-metallic salt catalyzer adopts zinc naphthenate.
A kind of preparation method of above-mentioned organic-silicon-modified epoxy Heat and corrosion resistant coating comprises the steps:
That 1) adopts that the methylphenyl siloxane monomer carries out prepolymer is synthesized into the organosilicon oligopolymer;
2) with dimethylbenzene and pimelinketone as mixed solvent, add organo-metallic salt catalyzer, Resins, epoxy E-20 and organosilicon oligopolymer obtain light yellow transparent liquid at 120～135 ℃ of reaction 3～5h, adding an amount of solvent again, to make solid content be 50% solution, promptly gets binder resin;
3) add color stuffing, solvent and auxiliary agent in the binder resin and promptly get coating host;
Step 2 wherein) the weight part consumption of each raw material is in: aminomethyl phenyl organosilicon oligopolymer
110-200 part, Resins, epoxy E-20150-160 part, 140 parts of dimethylbenzene, 60 parts of pimelinketone, organo-metallic salt catalyzer 0.25-0.75 part;
The weight percent consumption of each raw material is in the step 3): binder resin 50-55%, color stuffing 30-37%, solvent 9.5-10%, auxiliary agent 0.25-0.5%.
Preferably, solvent in the described step 3) is made up of dimethylbenzene, butyl ester and anti-settling agent 201P, wherein the consumption of dimethylbenzene accounts for 5% of coating host weight, and the consumption of fourth fat accounts for 2.5% of coating host weight, and the consumption of anti-settling agent 201P accounts for the 2-2.5% of coating host weight.
Preferably, described color stuffing is made up of following components by part by weight: titanium dioxide 20-25 part, mica powder 10-12 part; Described organo-metallic salt catalyzer adopts zinc naphthenate.
Above-mentioned steps 2) reactive group of methyl toluene organosilicon oligopolymer and Resins, epoxy reason is in:
The present invention utilizes the hydroxyl in hydroxyl, amino, alkoxyl group and the Resins, epoxy in the silicone resin to carry out the condensation copolymerization reaction, organosilicon-Si-O-group is grafted in the Resins, epoxy, obtain having better thermotolerance, preservative property, and the good modified epoxy heat resisting coating of paint film property.
Embodiment
Below by embodiment the present invention is made specific description, but protection scope of the present invention is not limited to this.
A kind of organic-silicon-modified epoxy Heat and corrosion resistant coating is made up of coating host A component and solidifying agent B component, and described coating host is made up of binder resin, color stuffing, solvent and auxiliary agent, and described coating host is got by following step preparation:
That 1) adopts that the methylphenyl siloxane monomer carries out prepolymer is synthesized into the organosilicon oligopolymer;
2) with dimethylbenzene and pimelinketone as mixed solvent, add the zinc naphthenate catalyzer, Resins, epoxy E-20 and organosilicon oligopolymer obtain light yellow transparent liquid at 130 ℃ of reaction 4h, adding an amount of solvent again, to make solid content be 50% solution, promptly gets binder resin;
Resin reaction is filled a prescription as following table 1:
Table 1: organic-silicon-modified epoxy heat stable resin composition of raw materials
| Material name | Weight part |
| Aminomethyl phenyl organosilicon oligopolymer | 150 |
| Resins, epoxy E-20 | 155 |
| Dimethylbenzene | 140 |
| Pimelinketone | 60 |
| The zinc naphthenate catalyzer | 0.50 |
3) add color stuffing, solvent and auxiliary agent in the binder resin and promptly get coating host; Coating host agent prescription such as following table 2:
Table 2, organic-silicon-modified epoxy Heat and corrosion resistant coating host agent prescription
| Material name | Mass percent % |
| Modifying epoxy resin by organosilicon | 52 |
| Titanium dioxide | 22 |
| Mica powder | 11 |
| Anti-settling agent 201P | 2.3 |
| Dimethylbenzene | 5 |
| Butyl ester | 2.5 |
| Auxiliary agent | 0.3 |
Annotate: solidifying agent adopts polyamide curing agent NX2016, host: solidifying agent=10: 1.
Coating of the present invention is two-pack, need do performance test after completely solidified, and its basic mechanical design feature index detects as follows:
A) time of drying: surface drying≤4h does solid work≤24h;
B) thermotolerance is 250 ℃: 4h passes through;
C) anti-40% sulfuric acid: 30 days no abnormal;
D) anti-5% sodium hydroxide: 30 days no abnormal;
E) viscosity (being coated with the 4# cup): 〉=80s;
F) impact strength: 50cm.
Annotate: coating heat resistance can test board for being of a size of the tinplate of 50mm * 120mm * 2mm, with paint spay-coating or brush on the tinplate test board, after the curing, at 250 ℃ of retort furnaces baking 4h down.
No abnormal-no bubble, wrinkling, crackle allow color and gloss that slight variation is arranged.
No abnormal-as not ftracture, do not come off, allow light discolouration.
Coating of the present invention has excellent thermotolerance and antiseptic property, can adapt to 250-400 ℃ hot environment, the painting anticorrosion that is widely used in surfaces such as iron and steel chimney, high-temperature pipe, High Temperature Furnaces Heating Apparatus, petroleum cracking device, high-temperature reaction equipment and military industry equipment, prevent metal thermooxidizing corrosion at high temperature such as iron and steel, guarantee the equipment life-time service, have good market outlook.
Claims (10)
1. organic-silicon-modified epoxy Heat and corrosion resistant coating, form by coating host A component and solidifying agent B component, described coating host is made up of binder resin, color stuffing, solvent and auxiliary agent, it is characterized in that: described binder resin is got by aminomethyl phenyl organosilicon oligopolymer modified epoxy E-20, its consumption accounts for the 50-55% of coating host weight, the weight ratio of aminomethyl phenyl organosilicon oligopolymer and Resins, epoxy E-20 is 11-20:15-16, described solidifying agent is a polymeric amide, and the weight ratio of described coating host and solidifying agent is 100:7～12.
2. organic-silicon-modified epoxy Heat and corrosion resistant coating according to claim 1 is characterized in that: the weight ratio of described coating host and solidifying agent is 10:1.
3. organic-silicon-modified epoxy Heat and corrosion resistant coating according to claim 1 is characterized in that: described solidifying agent is polyamide curing agent NX2016.
4. organic-silicon-modified epoxy Heat and corrosion resistant coating according to claim 1, it is characterized in that: described color stuffing is made up of titanium dioxide and mica powder, wherein the titanium dioxide consumption accounts for the 20-25% of coating host weight, and the mica powder consumption accounts for the 10-12% of coating host weight.
5. the preparation method of organic-silicon-modified epoxy Heat and corrosion resistant coating according to claim 1, it is characterized in that: described solvent is made up of dimethylbenzene, butyl ester and anti-settling agent 201P, wherein the consumption of dimethylbenzene accounts for 5% of coating host weight, the consumption of fourth fat accounts for 2.5% of coating host weight, and the consumption of anti-settling agent 201P accounts for the 2-2.5% of coating host weight.
6. the preparation method of organic-silicon-modified epoxy Heat and corrosion resistant coating according to claim 1, it is characterized in that: described binder resin is by the preparation of following step and get: with dimethylbenzene and pimelinketone as mixed solvent, add organo-metallic salt catalyzer, Resins, epoxy E-2O and organosilicon oligopolymer are at 120～135 ℃ of reaction 3～5h, obtain light yellow transparent liquid, adding an amount of solvent again, to make solid content be 50% solution, promptly gets binder resin; The weight part consumption of each raw material is: aminomethyl phenyl organosilicon oligopolymer 110-200 part, Resins, epoxy E-20 150-160 part, 140 parts of dimethylbenzene, 60 parts of pimelinketone, organo-metallic salt catalyzer 0.25-0.75 part.
7. organic-silicon-modified epoxy Heat and corrosion resistant coating according to claim 6 is characterized in that: described organo-metallic salt catalyzer adopts zinc naphthenate.
8. the preparation method of the described organic-silicon-modified epoxy Heat and corrosion resistant coating of claim 1 is characterized in that comprising the steps:
That 1) adopts that the methylphenyl siloxane monomer carries out prepolymer is synthesized into the organosilicon oligopolymer;
2) with dimethylbenzene and pimelinketone as mixed solvent, add organo-metallic salt catalyzer, Resins, epoxy E-2O and organosilicon oligopolymer obtain light yellow transparent liquid at 120～135 ℃ of reaction 3～5h, adding an amount of solvent again, to make solid content be 50% solution, promptly gets binder resin;
3) add color stuffing, solvent and auxiliary agent in the binder resin and promptly get coating host;
Step 2 wherein) the weight part consumption of each raw material is in: aminomethyl phenyl organosilicon oligopolymer 110-200 part, Resins, epoxy E-20 150-160 part, 140 parts of dimethylbenzene, 60 parts of pimelinketone, organo-metallic salt catalyzer 0.25-0.75 part;
The weight percent consumption of each raw material is in the step 3): binder resin 50-55%, color stuffing 30-37%, solvent 9.5-10%, auxiliary agent 0.25-0.5%.
9. the preparation method of organic-silicon-modified epoxy Heat and corrosion resistant coating according to claim 8, it is characterized in that: the solvent in the described step 3) is made up of dimethylbenzene, butyl ester and anti-settling agent 201P, wherein the consumption of dimethylbenzene accounts for 5% of coating host weight, the consumption of fourth fat accounts for 2.5% of coating host weight, and the consumption of anti-settling agent 201P accounts for the 2-2.5% of coating host weight.
10. the preparation method of organic-silicon-modified epoxy Heat and corrosion resistant coating according to claim 8 is characterized in that: described color stuffing is made up of following components by part by weight: titanium dioxide 20-25 part, mica powder 10-12 part; Described organo-metallic salt catalyzer adopts zinc naphthenate.
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Address after: 313201 No. 3 Hedong Road, Deqing County New Town Industrial Park, Zhejiang, Huzhou Patentee after: Zhejiang bridge paint Co., Ltd. Address before: Hangzhou City, Zhejiang province 310011 Gongshu District Dengyun Road No. 555 Patentee before: Hangzhou Paint Co., Ltd. |