CN109880482A - A kind of preparation method and composite coating of polyamide/epoxide resin composite coating - Google Patents

A kind of preparation method and composite coating of polyamide/epoxide resin composite coating Download PDF

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CN109880482A
CN109880482A CN201910117294.9A CN201910117294A CN109880482A CN 109880482 A CN109880482 A CN 109880482A CN 201910117294 A CN201910117294 A CN 201910117294A CN 109880482 A CN109880482 A CN 109880482A
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polyamide
composite coating
preparation
epoxy resin
resin composite
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王文耕
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ANQING HONGTAI NEW MATERIAL Co Ltd
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ANQING HONGTAI NEW MATERIAL Co Ltd
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Abstract

The invention discloses a kind of preparation methods of polyamide/epoxide resin composite coating, specifically includes the following steps: the preparation of (1) modified manometer silicon dioxide;(2) preparation of conductive compounded mix;(3) pretreatment of epoxy resin;(4) compound pigments and fillers preparation;(5) divide three equal parts to be added portionwise in pretreatment epoxy resin solution the compound pigments and fillers of gained, 30-40min is then stirred using emulsification cutter;(6) polyamide curing agent is added and stirs 4-6min, and the viscosity of adjusting coating is 40~50s;The composite coating as made from the method is also disclosed, composite coating made from the method for the present invention has good antistatic property, preferable resistance to acid and alkali, water resistance, salt fog resistance, phenomena such as flexibility is preferable, and corrugation, decortication does not occur after high-temperature process, is suitble to industrialization operation.

Description

A kind of preparation method and composite coating of polyamide/epoxide resin composite coating
Technical field
The invention belongs to technical field of coatings, and in particular to a kind of preparation method of polyamide/epoxide resin composite coating And composite coating.
Background technique
The problems such as increasing bring environmental pollution, energy consumption with vehicle, energy-saving and environmental protection, lightweight gradually become pass The emphasis of note.Track transportation industry rapidly develops, and furthered intercity distance.Lightweight is the pass for reducing energy consumption in train journey Key index.And in the strategic system field for improving rolling stock project, one of prepreerence direction of scientific rersearch is exactly using new material. Dense atmosphere is the basic reason for limiting rail traffic development, and when speed per hour is greater than 400km/h, it is total that air drag accounts for train operation 70% or more of resistance, lightweighting materials are the important methods for solving the problems, such as this.Since carbon fiber density only has 1.6g/cm3It is left The right side, only the 2/3 of aluminium alloy can not only play the effect of obvious loss of weight using carbon fibre composite, but also have enhancing Effect, therefore be self-possessed to have the function that energy-saving and emission-reduction with vehicle body can be greatly lowered on the rail vehicle.But carbon fiber is multiple Condensation material self color is more single, is not able to satisfy the visual demand of people, needs to carry out coating to material surface.It is applied by surface Dress, can not only play a certain protective role material, and can improve the use and sales value of product.
There is no the coating of coating carbon fibre composite, commercially available general coating and metallic paint and carbon currently on the market The matching of fibrous plate is poor, not good enough so as to cause poor adhesive force or paint film property, therefore develops and be suitable for carbon fiber sheet Coating be of great significance.It is less to the research for being suitable for carbon fiber sheet coating both at home and abroad, the Wang Naxin etc. of a vapour company Pass through research epoxy base carbon fibre in " research of epoxy group carbon fibre reinforced composite body outer panel coating process " Enhance the coating of composite material, discovery can obtain optimal painting effect using 3C2B technique, and the epoxy primer prepared is attached Excellent effect, paint film property it is also preferable;Wu Linzhi of Harbin Institute of Technology etc. passes through in carbon fiber reinforced polyester composite wood Laminae surface coats the thermally conductive of graphite film (HOGF) Lai Gaishan polyacrylonitrile (PAN) base carbon fiber composite material of orientation Coefficient;Chen Xu et al. is in " epoxy coating and the research of carbon fibre composite paintability " using epoxy resin and polyamide as base Material passes through the modified Nano-meter SiO_2 of addition KH 5602, SiC micro mist, the substances such as talcum powder and pigment are prepared for one kind and are suitable for The epoxy coating of carbon fibre composite plate coating is coated on activating solution treated carbon fiber sheet, and paint film has fine Resistance to acid and alkali, water resistance and salt fog resistance, phenomena such as and flexibility is preferable, and corrugation, decortication do not occur for paint film after high-temperature process.
However existing epoxy resin composite coating antistatic property is poor, the filler of addition is all inorganic matter, with polymer knot Structure differs greatly, poor with the compatibility of resin, needs by complicated surface treatment, and adding proportion is big, to the attached of coating Put forth effort, the physical mechanical properties such as impact resistance, flexibility are affected.And antistatic agent is mostly low-molecular-weight organic compound, It is easy to happen migration in the polymer, antistatic property is influenced by the humidity of environment, and very big, thermal stability is poor.It is necessary to existing Epoxy resin composite coating in technology is improved, to solve the above problems.
Summary of the invention
Technical problem to be solved by the present invention lies in: a kind of preparation side of polyamide/epoxide resin composite coating is provided Method, thus the technical problem that the antistatic property for solving epoxy resin composite coating is poor, flexibility is bad, impact resistance is weak.
The present invention solves above-mentioned technical problem using following technical scheme:
A kind of preparation method of polyamide/epoxide resin composite coating, comprising the following steps:
(1) room temperature ultrasonic disperse 20-30min after mixing nano silica, dehydrated alcohol, distilled water, is added silane Coupling agent adjusts pH 8~9, is condensed back at 85-90 DEG C, stirs 5-6h, centrifugation, washing, vacuum drying 20-24h, then Freezing processing 6-8h, obtains modified manometer silicon dioxide;
(2) into silicon carbide micro-powder, talcum powder, addition paratoluenesulfonic acid sodium salt, distilled water are stirred and evenly mixed, and pyrroles side is added and stirs It mixes side and instills FeCl3Aqueous solution reacts 2-4h, stops stirring, by reactant centrifuge separation, washs, so repeatedly 3~5 times, institute The product obtained is dried under vacuum to constant weight at 80 DEG C and obtains conductive compounded mix;
(3) epoxide resin vacuum is dehydrated 2~3h, the first mixed solvent is then added while hot makes epoxy resin dissolve and stir It mixes uniformly, is cooled to room temperature, obtains pretreatment epoxy resin solution;
(4) step (1) modified manometer silicon dioxide, the conductive compounded mix of step (2), titanium dioxide mixing are put into ball mill Middle milled processed 20-30min, obtains compound pigments and fillers;
(5) divide three equal parts that step (3) pretreatment epoxy resin solution is added portionwise compound pigments and fillers obtained by step (4) In, 30-40min is then stirred using emulsification cutter;
(6) polyamide curing agent is added into step (5) resulting material and stirs 4-6min, stirring rate is 230~250r/ Min, and be 40~50s by the viscosity of the second mixed solvent adjusting coating.
Further, nano silica in the step (1): dehydrated alcohol: the mass ratio of distilled water is 1: 45: 5.
Further, silane coupling agent is one of KH560, KH550, methyltriethoxysilane in the step (1); Its additive amount is the 4-6% of nano silica quality.
Further, be dried in vacuo 60 DEG C in a vacuum drying oven in the step (1), under the conditions of 0.1MPa for 24 hours, then at- 10~-20 DEG C of freezing processing 8h.
Further, silicon carbide micro-powder in the step (2): the mass ratio of talcum powder is 3: 4;The FeCl3With pyrroles's The ratio between amount of substance is (2-3): 1;The pyrroles: the mass ratio of silicon carbide micro-powder and talc mixture is (0.2-0.4): 1; The p-methyl benzenesulfonic acid na concn is 0.01-0.03gmL-1
Further, epoxy resin is placed in a vacuum drying oven in the step (3), it is true under the conditions of 110 DEG C, 0.1MPa 2~3h of sky dehydration.
Further, the first mixed solvent is dimethylbenzene-n-butanol mixed solvent in the step (3), wherein described two Toluene: the volume ratio of n-butanol is 5: 1.
Further, the second mixed solvent is butyl glycol ether-acetone mixed solvent in the step (6), wherein the second Glycol butyl ether: the volume ratio of acetone is 6: 1.
Further, by weight percentage, the epoxy resin composite coating is mainly prepared from the following materials: ring Oxygen resin 30-40%, polyamide 12-35%, modified manometer silicon dioxide 1-2%, conductive compounded mix 13-15%, titanium dioxide 8-10%, the first mixed solvent 20-35%;The epoxy resin be bisphenol A type epoxy resin E-44, epoxide number be 0.41~ 0.45;The polyamide is polyamide 6 50 or polyamide 221X-70.
Further, the invention also discloses the polyamide/epoxide resin composite coatings by the method preparation.
The technology of the present invention the present invention provides a kind of the utility model has the advantages that prepare with good antistatic property, with preferably soft Toughness, impact resistance, heat-resisting, moisture-proof polyamide/epoxide resin composite coating method, nano silica is even by silane Join agent modification, surface grafting organic long-chain, the enhancing of oleophylic ability, dispersion effect is improved in oleaginous system, right Epoxy paint film adhesion is improved to play an important role;By silicon carbide micro-powder, talcum powder existing for the dopant paratoluenesulfonic acid sodium salt Under the conditions of, make pyrrole monomer that chemical oxidising polymerisation reaction occur in compounded mix particle surface by oxidant of ferric trichloride, mentions The high electric conductivity of compounded mix, so as to improve the antistatic property of composite coating;Composite coating made from the method for the present invention With preferable resistance to acid and alkali, water resistance, salt fog resistance, flexibility is preferable, and it is existing that corrugation, decortication etc. does not occur after high-temperature process As being suitble to industrialization operation.
Specific embodiment
For convenient for those skilled in the art understand that technical solution of the present invention, now in conjunction with specific embodiment to the technology of the present invention side Case is described further.
Embodiment 1
A kind of preparation method of polyamide/epoxide resin composite coating, comprising the following steps:
(1) it after mixing 2g nano silica, 90g dehydrated alcohol, 10g distilled water, places it in ultrasonic dispersers Room temperature disperses 20min, and 0.08g Silane coupling agent KH550 is added, and is 8~9 with the pH that ammonium hydroxide adjusts solution, condenses at 85 DEG C 5h is stirred in reflux, 20h is dried in vacuo under the conditions of centrifugation, washing and then 60 DEG C in a vacuum drying oven, 0.1MPa, then at -10 DEG C freezing processing 6h, obtains modified manometer silicon dioxide;
(2) into silicon carbide micro-powder, talcum powder, addition paratoluenesulfonic acid sodium salt, distilled water are stirred and evenly mixed, and pyrroles side is added and stirs It mixes side and instills FeCl3Aqueous solution reacts 2h, stops stirring, by reactant centrifuge separation, washs, so repeatedly 3~5 times, gained Product be dried under vacuum to constant weight at 80 DEG C and obtain conductive compounded mix;
(3) epoxy resin is placed in a vacuum drying oven, the vacuum dehydration 2h under the conditions of 110 DEG C, 0.1MPa, then while hot The first mixed solvent of dimethylbenzene-n-butanol, which is added, makes epoxy resin dissolve and stir evenly, wherein the dimethylbenzene: n-butanol Volume ratio be 5: 1, be cooled to room temperature, obtain pretreatment epoxy resin solution;
(4) step (1) modified manometer silicon dioxide, the conductive compounded mix of step (2), titanium dioxide mixing are put into ball mill Middle milled processed 20min, obtains compound pigments and fillers;
(5) divide three equal parts that step (3) pretreatment epoxy resin solution is added portionwise compound pigments and fillers obtained by step (4) In, 30min is then stirred using emulsification cutter;
(6) 50 curing agent of polyamide 6 is added into step (5) resulting material and stirs 4min, stirring rate 230r/min, And the viscosity for passing through the second mixed solvent of butyl glycol ether-acetone adjusting coating is 40~50s, wherein the butyl glycol ether : the volume ratio of acetone is 6: 1.
Further, silicon carbide micro-powder in the step (2): the mass ratio of talcum powder is 3: 4;The FeCl3With pyrroles's The ratio between amount of substance is 2: 1;The pyrroles: the mass ratio of (silicon carbide micro-powder+talcum powder) is 0.2: 1;The p-methyl benzenesulfonic acid Na concn is 0.01gmL-1
Further, by weight percentage, a kind of polyamide/epoxide resin composite coating master prepared according to the method described above To include following raw material: epoxy resin 30%, polyamide 12%, modified manometer silicon dioxide 2%, conductive compounded mix 15%, Titanium dioxide 10%, the first mixed solvent 30%.
Further, the epoxy resin is bisphenol A type epoxy resin E-44, and epoxide number is 0.41~0.45.
Embodiment 2
A kind of preparation method of polyamide/epoxide resin composite coating, comprising the following steps:
(1) it after mixing 2g nano silica, 90g dehydrated alcohol, 10g distilled water, places it in ultrasonic dispersers Room temperature disperses 25min, and 0.1g silane coupling agent KH560 is added, and is 8~9 with the pH that ammonium hydroxide adjusts solution, is condensed back at 90 DEG C Stream stirs 5.5h, is dried in vacuo for 24 hours under the conditions of centrifugation, washing and then 60 DEG C in a vacuum drying oven, 0.1MPa, then at -20 DEG C freezing processing 8h, obtains modified manometer silicon dioxide;
(2) into silicon carbide micro-powder, talcum powder, addition paratoluenesulfonic acid sodium salt, distilled water are stirred and evenly mixed, and pyrroles side is added and stirs It mixes side and instills FeCl3Aqueous solution reacts 4h, stops stirring, by reactant centrifuge separation, washs, so repeatedly 3~5 times, gained Product be dried under vacuum to constant weight at 80 DEG C and obtain conductive compounded mix;
(3) epoxy resin is placed in a vacuum drying oven, vacuum dehydration 2.5h, then takes advantage of under the conditions of 110 DEG C, 0.1MPa The first mixed solvent of dimethylbenzene-n-butanol, which is added, in heat makes epoxy resin dissolve and stir evenly, wherein the dimethylbenzene: positive fourth The volume ratio of alcohol is 5: 1, is cooled to room temperature, obtains pretreatment epoxy resin solution;
(4) step (1) modified manometer silicon dioxide, the conductive compounded mix of step (2), titanium dioxide mixing are put into ball mill Middle milled processed 30min, obtains compound pigments and fillers;
(5) divide three equal parts that step (3) pretreatment epoxy resin solution is added portionwise compound pigments and fillers obtained by step (4) In, 40min is then stirred using emulsification cutter;
(6) polyamide 221X-70 curing agent is added into step (5) resulting material and stirs 5min, stirring rate 250r/ Min, and be 40~50s by the viscosity of the second mixed solvent of butyl glycol ether-acetone adjusting coating, wherein the ethylene glycol Butyl ether: the volume ratio of acetone is 6: 1.
Further, silicon carbide micro-powder in the step (2): the mass ratio of talcum powder is 3: 4;The FeCl3With pyrroles's The ratio between amount of substance is 3: 1;The pyrroles: the mass ratio of (silicon carbide micro-powder+talcum powder) is 0.4: 1;The p-methyl benzenesulfonic acid Na concn is 0.03gmL-1
Further, by weight percentage, a kind of polyamide/epoxide resin composite coating master prepared according to the method described above It to include following raw material: epoxy resin 39%, polyamide 13%, modified manometer silicon dioxide 1.5%, conductive compounded mix 13%, titanium dioxide 9%, the first mixed solvent 25%.
Further, the epoxy resin is bisphenol A type epoxy resin E-44, and epoxide number is 0.41~0.45.
Embodiment 3
A kind of preparation method of polyamide/epoxide resin composite coating, comprising the following steps:
(1) it after mixing 2g nano silica, 90g dehydrated alcohol, 10g distilled water, places it in ultrasonic dispersers Room temperature disperses 25min, and 0.12g silane coupling agent KH560 is added, and is 8~9 with the pH that ammonium hydroxide adjusts solution, condenses at 90 DEG C 6h is stirred in reflux, 22h is dried in vacuo under the conditions of centrifugation, washing and then 60 DEG C in a vacuum drying oven, 0.1MPa, then at -15 DEG C freezing processing 7h, obtains modified manometer silicon dioxide;
(2) into silicon carbide micro-powder, talcum powder, addition paratoluenesulfonic acid sodium salt, distilled water are stirred and evenly mixed, and pyrroles side is added and stirs It mixes side and instills FeCl3Aqueous solution reacts 3h, stops stirring, by reactant centrifuge separation, washs, so repeatedly 3~5 times, gained Product be dried under vacuum to constant weight at 80 DEG C and obtain conductive compounded mix;
(3) epoxy resin is placed in a vacuum drying oven, the vacuum dehydration 3h under the conditions of 110 DEG C, 0.1MPa, then while hot The first mixed solvent of dimethylbenzene-n-butanol, which is added, makes epoxy resin dissolve and stir evenly, wherein the dimethylbenzene: n-butanol Volume ratio be 5: 1, be cooled to room temperature, obtain pretreatment epoxy resin solution;
(4) step (1) modified manometer silicon dioxide, the conductive compounded mix of step (2), titanium dioxide mixing are put into ball mill Middle milled processed 25min, obtains compound pigments and fillers;
(5) divide three equal parts that step (3) pretreatment epoxy resin solution is added portionwise compound pigments and fillers obtained by step (4) In, 35min is then stirred using emulsification cutter;
(6) polyamide 221X-70 curing agent is added into step (5) resulting material and stirs 6min, stirring rate 240r/ Min, and be 40~50s by the viscosity of the second mixed solvent of butyl glycol ether-acetone adjusting coating, wherein the ethylene glycol Butyl ether: the volume ratio of acetone is 6: 1.
Further, silicon carbide micro-powder in the step (2): the mass ratio of talcum powder is 3: 4;The FeCl3With pyrroles's The ratio between amount of substance is 2.5: 1;The pyrroles: the mass ratio of (silicon carbide micro-powder+talcum powder) is 0.3: 1;It is described to toluene sulphur Sour na concn is 0.02gmL-1
Further, by weight percentage, a kind of polyamide/epoxide resin composite coating master prepared according to the method described above To include following raw material: epoxy resin 35%, polyamide 20%, modified manometer silicon dioxide 1%, conductive compounded mix 14%, Titanium dioxide 10%, the first mixed solvent 20%.
Further, the epoxy resin is bisphenol A type epoxy resin E-44, and epoxide number is 0.41~0.45.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations;Although with reference to the foregoing embodiments Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation Technical solution documented by example is modified or equivalent replacement of some of the technical features;And these modification or Replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.

Claims (10)

1. a kind of preparation method of polyamide/epoxide resin composite coating, which comprises the following steps:
(1) room temperature ultrasonic disperse 20-30min after mixing nano silica, dehydrated alcohol, distilled water, is added silane coupled Agent adjusts pH 8~9, is condensed back at 85-90 DEG C, stirs 5-6h, centrifugation, washing, vacuum drying 20-24h, then freezes 6-8h is handled, modified manometer silicon dioxide is obtained;
(2) into silicon carbide micro-powder, talcum powder, addition paratoluenesulfonic acid sodium salt, distilled water are stirred and evenly mixed, and pyrroles is added while stirring Instill FeCl3Aqueous solution reacts 2-4h, stops stirring, so repeatedly 3~5 times, resulting by reactant centrifuge separation, washing Product is dried under vacuum to constant weight at 80 DEG C and obtains conductive compounded mix;
(3) epoxide resin vacuum is dehydrated 2~3h, the first mixed solvent is then added while hot to be dissolved epoxy resin and stir It is even, it is cooled to room temperature, obtains pretreatment epoxy resin solution;
(4) step (1) modified manometer silicon dioxide, the conductive compounded mix of step (2), titanium dioxide mixing are put into ball mill and are ground Mill processing 20-30min, obtains compound pigments and fillers;
(5) three equal parts are divided to be added portionwise in step (3) pretreatment epoxy resin solution compound pigments and fillers obtained by step (4), Then 30-40min is stirred using emulsification cutter;
(6) polyamide curing agent is added into step (5) resulting material and stirs 4-6min, stirring rate is 230~250r/min, And the viscosity for passing through the second mixed solvent adjusting coating is 40~50s.
2. a kind of preparation method of polyamide/epoxide resin composite coating according to claim 1, which is characterized in that institute State nano silica in step (1): dehydrated alcohol: the mass ratio of distilled water is 1: 45: 5.
3. a kind of preparation method of polyamide/epoxide resin composite coating according to claim 1, which is characterized in that institute Stating silane coupling agent in step (1) is one of KH560, KH550, methyltriethoxysilane;Its additive amount is nanometer two The 4-6% of siliconoxide mass.
4. a kind of preparation method of polyamide/epoxide resin composite coating according to claim 1, which is characterized in that institute It states in step (1) 60 DEG C in a vacuum drying oven, be dried in vacuo for 24 hours under the conditions of 0.1MPa, then at -10~-20 DEG C of freezing processings 8h。
5. a kind of preparation method of polyamide/epoxide resin composite coating according to claim 1, which is characterized in that institute State silicon carbide micro-powder in step (2): the mass ratio of talcum powder is 3: 4;The FeCl3It is (2- with the ratio between the amount of substance of pyrroles 3):1;The pyrroles: the mass ratio of silicon carbide micro-powder and talc mixture is (0.2-0.4): 1;The paratoluenesulfonic acid sodium salt Concentration is 0.01-0.03gmL-1
6. a kind of preparation method of polyamide/epoxide resin composite coating according to claim 1, which is characterized in that institute It states and is placed in a vacuum drying oven epoxy resin in step (3), 2~3h of vacuum dehydration under the conditions of 110 DEG C, 0.1MPa.
7. a kind of preparation method of polyamide/epoxide resin composite coating according to claim 1, which is characterized in that institute Stating the first mixed solvent in step (3) is dimethylbenzene-n-butanol mixed solvent, wherein the dimethylbenzene: the volume of n-butanol Than being 5: 1.
8. a kind of preparation method of polyamide/epoxide resin composite coating according to claim 1, which is characterized in that institute Stating the second mixed solvent in step (6) is butyl glycol ether-acetone mixed solvent, wherein the butyl glycol ether: the body of acetone Product is than being 6: 1.
9. a kind of preparation method of polyamide/epoxide resin composite coating according to claim 7, which is characterized in that press Weight percent meter, the epoxy resin composite coating are mainly prepared from the following materials: epoxy resin 30-40%, being gathered Amide 12-35%, modified manometer silicon dioxide 1-2%, conductive compounded mix 13-15%, titanium dioxide 8-10%, the first mixing are molten Agent 20-35%;Wherein the epoxy resin is bisphenol A type epoxy resin E-44, and epoxide number is 0.41~0.45;The polyamides Amine is polyamide 6 50 or polyamide 221X-70.
10. the polyamide/epoxide resin composite coating prepared by method described in any one of claim 1-9.
CN201910117294.9A 2019-02-15 2019-02-15 A kind of preparation method and composite coating of polyamide/epoxide resin composite coating Withdrawn CN109880482A (en)

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