CN102492353A - Novel fast-set anticorrosion and wear-resistant epoxy powder coating and preparation process thereof - Google Patents
Novel fast-set anticorrosion and wear-resistant epoxy powder coating and preparation process thereof Download PDFInfo
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Abstract
The invention relates to the field of chemical coating, in particular to epoxy powder coating applied to material conveying steel belts in oilfield oil pumping pipelines or coal transportation in the oil industry. In a formula, the coating comprises the following components in percentage by weight: 32-56% of epoxy resin, 8-14% of curing agent, 30-50% of pigments and fillers, 2-10% of resin modifier and 2-6% of assistant, wherein the epoxy resin in the formula is bisphenol A type epoxy resin, a mixture of the bisphenol A type epoxy resin and phenolic aldehyde modified epoxy resin, and phenolic aldehyde modified epoxy resin, and the curing agent is phenolic hydroxyl resin. The epoxy powder coating disclosed by the invention belongs to fast-set anticorrosion and wear-resistant epoxy powder coating, has the granularity being 10-125 mu m, is applied under general curing conditions that the curing temperature is 180-200 DEG C and the curing time is 3-10min, can be regulated according to user needs and is superior to like products in anticorrosion performance, coating film mechanical performance and wear resistance, a preparation process is simple, the labour productivity can be obviously increased, and the epoxy powder coating is suitable for industrialized production.
Description
Technical field
The present invention relates to the chemistry painting industry field, especially a kind of novel fast setting anticorrosion antiwear epoxide powder coating that is used for mass transport steel band in petroleum industry oil field oil pick-up tube or the Coal Transport industry.
Background technology
Carry the anti-corrosion wear resisting powder paint kind of industry use many in oil production and coal at present; Powder coating on the market mainly can be divided into two big types of heat curing-type and thermoplastics types, and what in two big types, account for the principal status of public economy is respectively thermosetting epoxy resin anti-corrosion wear resisting powder paint and thermoplastic polymeric amide (nylon) toner coating.These two kinds of powder coating have certain application limitation, and the curing speed of epoxy powder coating is slow, and application production efficiency is low, and low temperature impact resistance of filming and resistance to bend(ing) can be undesirable; Polymeric amide (nylon) toner ADHESION OF PAINTS power and corrosion resistance nature a little less than.
The main resin kind that powder coating class related patent U.S. Patent No. such as CN87100920, CN1202508, CN1283660A, CN1483778, CN1511906, CN1746241 etc. mention is thermoset epoxy powder coating or polyamide thermoplastic (nylon) powder coating; The thermoset epoxy powder coating is bisphenol A type epoxy resin and Dyhard RU 100, replaces Dyhard RU 100 or sebacic dihydrazide curative systems that polyamide thermoplastic (nylon) toner coating is the film forming matter system of improving sticking power with redix.Aspect epoxide powder coating; It is still rarely known by the people that the better phenol aldehyde modified epoxy resin of antiseptic property, polyphenylene sulfide modified epoxy and antiseptic property, film performance better can quick-setting phenolic hydroxyl group resin curing agents; And pigment and filler generally adopt the good glass-cermic powder of tinting pigment and wear resistance, diopside, silicon carbide etc., and rust-stabilising pigment and hardness are high, the modification silicon powder and the nano-sized filler of good dispersivity also have only less application.
Summary of the invention
The present invention is antiseptic property and the curing speed that further improves and improve existing epoxide resin type anti-corrosion wear resisting powder paint and polymeric amide (nylon) resin type anti-corrosion wear resisting powder paint, the physical and mechanical properties of filming and wear resisting property and a kind of novel fast setting anticorrosion antiwear epoxide powder coating developed.
The technical solution adopted for the present invention to solve the technical problems is: a kind of novel fast setting anticorrosion antiwear epoxide powder coating, the quality percentage composition of each component is in its prescription: epoxy resin 32～56%, solidifying agent 8～14%, pigment and filler 30～50%, modifier 2～10%, auxiliary agent 2～6%.
Described epoxy resin is mixture or the phenol aldehyde modified epoxy resin that bisphenol A type epoxy resin or bisphenol A type epoxy resin and phenol aldehyde modified epoxy resin are formed by mass ratio at 1: 1; Both epoxy systems of back can significantly increase with the former films cross-linking density and improves the film anticorrosion performance; The softening temperature of bisphenol A type epoxy resin is 90 ℃～100 ℃, and oxirane value is 0.09～0.12; This phenol aldehyde modified epoxy resin is resol and epichlorohydrin reaction dehydrochlorination and the multiple functionality epoxide resin that obtains, and softening temperature is 90 ℃～110 ℃, and oxirane value is 0.95～0.125.
Described solidifying agent is Dyhard RU 100, replacement Dyhard RU 100, sebacic dihydrazide cured resin or phenolic hydroxyl group resin; The fast setting of phenolic hydroxyl group resin, anticorrosion, low temperature is shock-resistant and anti-bending and film performance obviously are superior to former three; This phenolic hydroxyl group resin softening point is 80 ℃～100 ℃, and hydroxyl value is 0.30～0.60.
Described solidifying agent is a binary lipid acid chain extension phenolic hydroxyl group resin.
Described pigment comprises: used for powder coating tinting pigment or novel non-poisonous antirust pigment or its two or more mixture; Wherein novel non-poisonous antirust pigment is specially aluminium triphosphate or composite iron-titanium powder or both mixtures, and the novel non-poisonous antirust pigment of this kind can significantly improve the anticorrosion and rustless property of coating.
Described filler median size is 500nm; Specifically comprise: wollastonite, glass-cermic powder, diopside, carborundum powder, wear-resisting and antiseptic property better and Mohs' hardness be 7 modified superfine (more than 3000 orders) silicon powder or nano level HT618 abrasion-resistant powder or above-described two or more mixture; The interpolation of above-mentioned modified superfine silicon powder or nano level HT618 abrasion-resistant powder; Equipment attrition in the time of not only can reducing the preparation powder coating; And can increase the wear resisting property of filming, prolong service life of equipment.
Described modifier be softening temperature 130 ℃～175 ℃ polymeric amide (nylon) resin, viscosity scope 10～20 seconds and melt temperature be 150～180 ℃ polyvinyl butyral acetal, melt-flow speed at the polyvinyl resin of 10～20g/10min, film-forming temperature at 230～250 ℃ the polyvinylidene fluoride resin or the polyphenylene sulfide or the above-described two or more mixture of coating level, this resinoid can significantly improve preservative property, wear resistance, snappiness, rigidity and the appearance of film of filming.
Described auxiliary agent is flow agent, dispersion agent, air release agent, fluffy powder, curing catalyst and lubricant, and described lubricant is molybdenumdisulphide or graphite, can significantly reduce the coefficient of friction of filming, and improves the wear resisting property of filming, and prolongs the work-ing life of equipment.
Described flow agent is a Yodo Sol GH 28, and dispersion agent is methylacrylic acid and cinnamic multipolymer, and air release agent is st-yrax or amide waxe, and fluffy powder is an aerosil, and curing catalyst is glyoxal ethyline or 2-benzylimidazoline.
Novel fast setting anticorrosion antiwear epoxide powder coating of the present invention has the technology of being prepared as follows:
(1) by behind the prescription weighing material; Addition sequence with epoxy resin, solidifying agent, filler, modifier, pigment, auxiliary agent; Material through high-speed mixer pre-mixing 3～5min, is melt extruded mixing with melt extruding mixing machine again, and the mixing section temperature is controlled at 95 ℃～105 ℃;
(2) will melt extrude mixture cools off with cooling roller and cooling zone; With crusher with material be crushed to below the thick 2mm, below the long and wide 15mm; Carry out the broken and classification of fine powder with the air classifying mill again, sieve with the rotating screen classification at last and obtain product, sieve number is 120 orders.
The invention has the beneficial effects as follows: it is solidifying agent that the present invention adopts the phenolic hydroxyl group resin, and under the effect of curing catalyst, the phenolic hydroxyl group of phenolic hydroxyl group resin and the epoxy group(ing) of epoxy resin are reacted film-forming.The gained powder coating belongs to fast setting anticorrosion antiwear epoxide powder coating, and the granularity of coating is 10～125 μ m, and general condition of cure is 180～200 ℃; 3～10min can adjust set time according to customer requirements, and the impact strength of filming can reach 50kg/cm; Snappiness 1mm, 0 grade of sticking power, the wear resisting property of filming≤30mg/1000 time; Salt fog resistance can reach more than the 3000h, and anticorrosion with coat performance, the physical and mechanical properties of filming and wear resisting property are superior to like product, and preparation technology is simple; Can significantly improve labor productivity, be fit to suitability for industrialized production.
Specific embodiment
Embodiment 1
A kind of novel fast setting anticorrosion antiwear epoxide powder coating; Have following prescription (each component is the quality percentage composition): 43 parts of bisphenol A type epoxy resins, 9 parts of binary lipid acid chain extension phenolic hydroxyl group resin curing agents, 5 parts of tinting pigments, 3.2 parts of aluminium triphosphates, 21.5 parts of silicon powders, 5 parts of nano level HT618 abrasion-resistant powders, 4 parts of polyvinyl resins, 3 parts of polymeric amide (nylon) resins, 2.0 parts of flow agents, 1.0 parts of dispersion agents, 0.5 part of st-yrax air release agent, 0.2 part of fluffy powder, 0.6 part of glyoxal ethyline curing catalyst, 2 parts of oildags, preparation technology is following:
(1) by behind the prescription weighing material; Addition sequence with epoxy resin, solidifying agent, filler, modifier, pigment, auxiliary agent; Material through high-speed mixer pre-mixing 3min, is melt extruded mixing with melt extruding mixing machine again, and the mixing section temperature is controlled at 95 ℃;
(2) will melt extrude mixture cools off with cooling roller and cooling zone; With crusher with material be crushed to below the thick 2mm, below the long and wide 15mm; Carry out the broken and classification of fine powder with air classifying mill again, at last with the rotating screen classification sieve product, sieve number is 120 orders.
Embodiment 2
A kind of novel fast setting anticorrosion antiwear epoxide powder coating; Have following prescription (each component is the quality percentage composition): 30 parts of bisphenol A type epoxy resins, 15 parts of phenol aldehyde modified epoxy resin, 8 parts of phenolic hydroxyl group resin curing agents, 5 parts of tinting pigments, 3.2 parts of composite iron-titanium powders, 25.5 parts of silicon powders, 4 parts of polyphenylene sulfides, 3 parts of polymeric amide (nylon) resins, 2.0 parts of flow agents, 1.0 parts of dispersion agents, 0.5 part of amide waxe air release agent, 0.2 part of fluffy powder, 0.6 part of 2-benzylimidazoline curing catalyst, 2 parts of oildags, preparation technology is following:
(1) by behind the prescription weighing material; Addition sequence with epoxy resin, solidifying agent, filler, modifier, pigment, auxiliary agent; Material through high-speed mixer pre-mixing 5min, is melt extruded mixing with melt extruding mixing machine again, and the mixing section temperature is controlled at 105 ℃;
(2) will melt extrude mixture cools off with cooling roller and cooling zone; With crusher with material be crushed to below the thick 2mm, below the long and wide 15mm; Carry out the broken and classification of fine powder with air classifying mill again, at last with the rotating screen classification sieve product, sieve number is 120 orders.
Embodiment 3
A kind of novel fast setting anticorrosion antiwear epoxide powder coating; Has following prescription (each component is the quality percentage composition): 40 parts of phenol aldehyde modified epoxy resin, 12 parts of phenolic hydroxyl group resin curing agents, 5 parts of tinting pigments, 3.2 parts of composite iron-titanium powders, 26.5 parts of silicon powders, 4 parts of pvdf resins, 3 parts of polymeric amide (nylon) resins, 2.0 parts of flow agents, 1.0 parts of dispersion agents, 0.5 part of amide waxe air release agent, 0.2 part of fluffy powder; 0.6 part of glyoxal ethyline curing catalyst, 2 parts of molybdenum disulfide lubricants, preparation technology is with embodiment 2.
Through detecting, the foregoing description one gained powder coating can be at 180 ℃, completely solidified film forming during 3min; Embodiment two and three gained powder coating can be at 180 ℃, completely solidified film forming in the 5min, and the granularity of three routine embodiment gained powder coating is 10～125 μ m; The impact strength of filming can reach 50kg/cm, snappiness 1mm, 0 grade of sticking power; The wear resisting property of filming≤30mg/1000 time, the salt spray resistance of filming reaches more than the 3000h.
Claims (8)
1. novel fast setting anticorrosion antiwear epoxide powder coating, it is characterized in that: the quality percentage composition of each component is in the prescription: epoxy resin 32～56%, solidifying agent 8～14%, pigment and filler 30～50%, modifier 2～10%, auxiliary agent 2～6%.
2. a kind of novel fast setting anticorrosion antiwear epoxide powder coating according to claim 1 is characterized in that: described epoxy resin is the mixture that bisphenol A type epoxy resin or phenol aldehyde modified epoxy resin or bisphenol A type epoxy resin and phenol aldehyde modified epoxy resin are formed by mass ratio at 1: 1; The softening temperature of described bisphenol A type epoxy resin is 90 ℃～100 ℃, and oxirane value is 0.09～0.12; Phenol aldehyde modified epoxy resin is resol and epichlorohydrin reaction dehydrochlorination and the multiple functionality epoxide resin that obtains; Softening temperature is 90 ℃～110 ℃, and oxirane value is 0.95～0.125, and solidifying agent is the phenolic hydroxyl group resin; Resin softening point is 80 ℃～100 ℃, and hydroxyl value is 0.30～0.60.
3. a kind of novel fast setting anticorrosion antiwear epoxide powder coating according to claim 1 and 2 is characterized in that: described solidifying agent is a binary lipid acid chain extension phenolic hydroxyl group resin.
4. a kind of novel fast setting anticorrosion antiwear epoxide powder coating according to claim 1, it is characterized in that: described pigment comprises aluminium triphosphate or composite iron-titanium powder or both mixtures.
5. a kind of novel fast setting anticorrosion antiwear epoxide powder coating according to claim 1, it is characterized in that: the median size of described filler is 500nm, comprises that specifically Mohs' hardness is 7 modification silicon powder and nano level HT618 abrasion-resistant powder.
6. a kind of novel fast setting anticorrosion antiwear epoxide powder coating according to claim 1 is characterized in that: described modifier is a softening temperature at 130 ℃～175 ℃ polyamide resin, viscosity scope is 150～180 ℃ polyvinyl butyral acetal, ldpe resin that melt flow rate is 10～20g/10min, film-forming temperature at 230～250 ℃ polyvinylidene fluoride resin or coating level polyphenylene sulfide or above-described two or more mixture 10～20 seconds and melt temperature.
7. a kind of novel fast setting anticorrosion antiwear epoxide powder coating according to claim 1, it is characterized in that: described auxiliary agent comprises molybdenumdisulphide or graphite.
8. the preparation technology of a novel fast setting anticorrosion antiwear epoxide powder coating is characterized in that: have following steps:
(1) by behind the prescription weighing material; Addition sequence with epoxy resin, solidifying agent, filler, modifier, pigment, auxiliary agent; Material through high-speed mixer pre-mixing 3～5min, is melt extruded mixing with melt extruding mixing machine again, and the mixing section temperature is controlled at 95 ℃～105 ℃;
(2) will melt extrude mixture cools off with cooling roller and cooling zone; With crusher with material be crushed to below the thick 2mm, below the long and wide 15mm; Carry out the broken and classification of fine powder with air classifying mill again, at last with the rotating screen classification sieve product, sieve number is 120 orders.
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