CN103160172B - Curable anticorrosion coating for teflon/polyethylene lining and coating method of curable anticorrosion coating - Google Patents
Curable anticorrosion coating for teflon/polyethylene lining and coating method of curable anticorrosion coating Download PDFInfo
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Abstract
The invention discloses a curable anticorrosion coating for a teflon/polyethylene lining and a coating method of the curable anticorrosion coating. The anticorrosion coating is composed of a component A and a component B at a ratio of (1:9)-(5:5), wherein the component A comprises the following components in parts by weight: 40-70 parts of linear low-density polyethylene, 60-30 parts of linear high-density polyethylene, 10-30 parts of polar elastomer, 0.1-0.5 part of antioxidant, 10-30 parts of polyethylene graft and 0-5 parts of efficient heat conducting packing; and the component B comprises the following components in parts by weight: 30-70 parts of linear high-density polyethylene, 70-30 parts of linear low-density polyethylene, 0-30 parts of teflon powder, 0-10 parts of nonpolar elastomer, 0.1-1 part of cross linking agent and 0.2-1.5 parts of assistant cross linking agent. Basic resin adopted by the curable anticorrosion coating is a composite material of high-density polyethylene and linear low-density polyethylene, so that the enough cross linking efficiency is ensured, meanwhile, the reduction degree of crystallinity is greatly reduced to the maximum extent, and the cross-linked material has excellent rigidity and hardness and also has excellent chemical corrosion resistance and barrier property.
Description
Technical field
The present invention relates to a kind of pipeline for delivering gas, liquid etc. and equipment, be specifically related to a kind of high abrasion, the multiple curable type tetrafluoroethylene/polyethylene kind inside lining anti-corrosive pipeline of high heat-resisting, heavy antisepsis and brushing method thereof.
Background technology
Along with expanding economy, to the requirement for anticorrosion such as pipeline, pump, day by day urgent and class improves constantly the every profession and trade such as chemical industry, oil, boats and ships, power plant, public utilities, it is also proposed more and more higher requirement to material antiseptic performance.In order to give pipeline more superior antiseptic property, once adopt plastics tubing to replace steel pipe, but in most of use occasion, because the intensity of plastics tubing, stiffness are inadequate, strongly limit its use range.Composite metal plastic corrosion-proof pipe is at the good plastic coating protective membrane of steel pipe walls surface application one deck; it not only overcomes the inadequate weakness of plastic tube intensity rigidity; and there are the good wear resistance of plastics, preservative property, the feature of dirt is not easily formed when carrying some media.Patent CN92239730.9 discloses the anti-corrosion pipeline of a kind of steel plastic integral bonding and the preparation method of container, and this pipeline and container are made up of steel body and plastic layer, has steel and moulds the advantage that bonding is firm, antiseptic property is good, can be used for the field such as chemical industry, metallurgy.Such as, but common monolayer thermoplastic's corrosion-proof lining, thermoplasticity rotation molding polyethylene, requiring harsh Application Areas (high temperature alkali corrosion, halogen system acid liquid corrosion), still can not meet the demands.Under height corrosion operating environment, the thermosetting material that antiseptic property is higher must be adopted.These materials generally adopted clinkery epoxy powder (FBE), coal tar enamel (CTE) and polyethylene composite structure (three layers of PE) in the past.These anticorrosion coating overall preservation performances can meet the requirement of oil-gas pipeline corrosion protection, but (clinkery epoxy powder preservative coat is thinner, resistant to mechanical damage intensity difference to still have respective defect; The pollution that coal tar enamel is cold short, hot-fluid drops down and may cause environment, makes its application surface more and more narrow; Polyethylene three-layer composite structure anticorrosive construction complex process).Patent CN101240134A discloses a kind of epoxy modifying polyethylene bi-component powdery paints, there is crosslinking reaction under appropriate circumstances in this material, form inierpeneirating network structure, there is excellent antiseptic property, but the material viscosity that the method adopts is larger, particularly epoxy resin, in order to obtain excellent mechanical property, general employing high viscosity epoxy, therefore tack of materials is large, be not suitable for roll moulding shaping technology, and, in the preparation method of this material, adding of inorganic particulate belongs to dry mixing process, disperse uneven, during for rotation molding, very easily be deposited between metallic conduit and inner lining material product, greatly reduce the cohesive force between inner lining material and metal, under subnormal ambient, easily cause shelling.Patent CN87100920A discloses the coating method of a kind of anti-corrosion wear resisting powder paint and this coating, with epoxy resin, nylon powder, Dyhard RU 100, glass-cermic powder is that protective system prepared by raw material, and this coating has effect that is anticorrosion, wear-resisting, strengthening concurrently, can be used for metallic conduit, anticorrosion in acid or alkali environment, but equally because tack of materials is comparatively large, be more suitable for spraying coating process.
In addition, application number be 201120454406.9,200520035161.0 and 200910198529.8 patent all adopt multilayer loop epoxy resins corrosion protection coating, the method first applies last layer epoxy powder on metallic conduit wall, and then applies last layer sizing agent, finally wraps up one deck polyolefine.Such anti-corrosion pipeline adopts multi-layer anticorrosion coating, not only effectively improves the antiseptic property of pipeline, and gives the cohesive force of material high.But this kind of material due to construction technology loaded down with trivial details, production control is more loaded down with trivial details, and cost is higher, and easily occurs in commissure extruding thinning phenomenon, causes tectum defect or produces hollowing, causing galvanic protection dead band.In addition, these class methods are mainly used in outside pipeline anticorrosion, for the pipeline that interior anticorrosion particularly bore is less, and inapplicable.
Meanwhile, due to the thermoplastics remaining polyolefins directly contacted with corrosive medium in above multilayer epoxy/polyethylene powder coating, therefore, anticorrosion, heat-resisting, the wear resisting property of pipeline can not meet harsh operating environment.Under this background, develop in time and be applicable to small-bore, interior rot-resistant heavy anticorrosive material and technique is very important.
In order to obtain higher production efficiency, revolving and mould (rotating showering, rotating fluidized bed) technique in recent years and being widely used in anticorrosion industry, achieving the heavy antisepsis of inner-walls of duct and small-bore pipeline.At present, state's inward turning ratio in the middle of raw material shared by linear low density polyethylene of moulding is 93%.In above-mentioned high corrosion-resistant field, because linear low density polyethylene is corrosion-resistant, wear-resisting, impermeable, the shortcoming of heat-resisting creep properties aspect, limits the application of linear low density polyethylene.
Crosslinked polyethylene rotational moulding material, with the superiority of high impact property, heat-resisting, resisting environmental stress and cracking, highly anticorrosion aspect, starts to be applied in corrosion-proof lining aspect.At present, the research of crosslinked polyethylene mainly concentrates on the silane crosslinking technology aspect of linear low density polyethylene.Patent CN 1876706A discloses the preparation method of silane crosslinked polyethylene plastic, the method is widely used in anti-crack tube, CABLE MATERIALS aspect, but the material of this technological forming has to pass through water-bath (or steam bath) aftertreatment, add technical process and cost, and the degree of crosslinking of material is not high, the requirement of height rot-resistant can not be met.Patent CN1524899A, CN1523052A is resin based on linear low density polyethylene and Low Density Polyethylene compounding ingredient, peroxide crosslinking technique is adopted to prepare crosslinked polyethylene rotational moulding PP Pipe Compound, crosslinked polyethylene prepared by this technique has good shock resistance and chemical resistance, but two kinds of raw materials are all Low Density Polyethylenes, the corrosion resistance nature of raw material is reported to the leadship after accomplishing a task relatively, after crosslinked, density reduces further, although material can not be corroded by solvability, but easily corroded by swelling property, in fact be not suitable for corrosion, barrier requires higher pipeline, in addition, patent CN1039039A adopts the method for radiation to prepare radial pattern crosslinked polyethylene, and material is used for the repaired mouth aspect of oil field gathering and transportation steel corrosion utilidor.But relative chemical is cross-linked, and radiation crosslinking efficiency is very low, and crosslink material degree is low, cannot meet requirement for anticorrosion, and due to device-restrictive, is difficult to realize the interior anticorrosion of caliber long tube road.Patent CN1524899A, CN1523052A is resin based on linear low density polyethylene and Low Density Polyethylene compounding ingredient, peroxide crosslinking technique is adopted to prepare crosslinked polyethylene rotational moulding PP Pipe Compound, crosslinked polyethylene prepared by this technique has good shock resistance and chemical resistance, but two kinds of raw materials are all Low Density Polyethylenes, the corrosion resistance nature of raw material is relatively poor, after crosslinked, density reduces further, although material can not be corroded by solvability, but easily corroded by swelling property, be not suitable for corrosion, barrier requires higher pipeline, and pipeline wear resisting property prepared by this method improves little, higher flyash is being required to wear resisting property, silt, grain transportation art, be not suitable for using.
Summary of the invention
Goal of the invention: the object of the invention is to make up the deficiencies in the prior art, provide a kind of curable type tetrafluoroethylene/polyethylene kind inside lining anti-corrosive coating, another object of the present invention, there is provided the brushing method of this protective system.
Technical scheme: a kind of curable type tetrafluoroethylene/polyethylene kind inside lining anti-corrosive coating, described protective system is made up of component A and B component, A: B=1: 9-5: 5, wherein, component A is made up of each component of following parts by weight: linear low density polyethylene: 40-70 part, linear high-density polyethylene 60-30 part, polar elastomers: 10-30 part, oxidation inhibitor: 0.1-0.5 part; Polycthylene grafted thing 10-30 part; High-efficiency heat conduction filler 0-5 part; B component: linear high-density polyethylene: 30-70 part, linear low density polyethylene: 70-30 part, tetrafluoroethylene class powder: 0-30 part, non-polar elastomer 0-10 part, linking agent: 0.1-1 part, additional crosslinker: 0.2-1.5 part.
As preferably, described linking agent is peroxide type linking agent, be 2, two (t-butyl peroxy) hexane of 5-dimethyl-2,5-, two 2 4-[two (2,4-dichloro-benzoyl) superoxide, peroxidation two (4-toluyl), dicumyl peroxide, two (t-butylperoxyisopropyl) benzene, 1,1-di-t-butyl methyl-3,5,5-trimethyl-cyclohexane, 1, one or more mixing in 1-di-t-butyl methyl-3,5,5-trimethyl-cyclohexane.
As preferably, described additional crosslinker is cyanacrylate, triallylcyanurate, one or more mixing in trimethylolpropane trimethacrylate.
As preferably, described oxidation inhibitor is the composite antioxidant of phosphite ester kind antioxidant and Hinered phenols antioxidant composition, and wherein phosphite ester kind antioxidant and Hinered phenols antioxidant are by weight 1: 0.3 ~ 1: 0.7 composition.
As preferably, described grafts be Research of Grafting Malaic Anhydride Onto Polyethylene, polypropylene grafted maleic anhydride, maleic anhydride grafted ABS one or more.
As preferably, described polar elastomers is one or more in ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, polyester type elastomer body.
As preferably, non-polar elastomer is one or several in SBS, SEP, SEBS.
As preferably, high-efficiency heat conduction filler is nanometer silicon carbide, aluminium nitride, boron nitride, magnesium oxide, aluminum oxide, one or several in powdered graphite.
As preferably, polytetrafluoro class powder is tetrafluoroethylene, tetrafluoroethylene and hexafluoropropylene copolymer, ethene and TFE copolymer, one or several in polyvinylidene difluoride (PVDF), poly-trifluoro-ethylene.
In order to realize another object of the present invention, provide following technical scheme: the brushing method of a kind of curable type tetrafluoroethylene/polyethylene kind inside lining anti-corrosive coating: comprise the following steps:
1) with sandblast machine to pipe surface to be sprayed rust cleaning, process of deoiling;
2) steel pipe or equipment are placed in horizontally rotate or the device of bidirectional rotation when temperature reaches 220 DEG C, start to inject protective system component A in pipeline, stop 2-4 minute, after treating the whole melting of powder, in pipeline, inject protective system B component, the rotating speed of pipeline is brought up to 40-80 rev/min simultaneously, and continue to add 220-300 DEG C, after treating the whole melting of powder, insulation 2-4 minute;
3) stop heating, by the self-heating of workpiece by powder levelling, be finally cooled to room temperature.
Beneficial effect: the present invention compared to the prior art, base resin of the present invention is the matrix material of high density polyethylene(HDPE) and linear low density polyethylene, namely ensure that enough cross-linking efficiencies, reduce the reduction of degree of crystallinity to the full extent simultaneously, make the material after being cross-linked have excellent rigidity and hardness, there is excellent resistance to chemical attack and barrier simultaneously.
Crosslinking process of the present invention is peroxide crosslinking technique, and the degree of crosslinking of matrix material is higher, impact corresponding with it, and anticorrosion and barrier excellence, do not need follow-up steam or poach process, technique is simple simultaneously.Containing polar elastomers and high-efficiency heat conduction agent in component A, effectively can improve cohesiveness and the resistance to cracking energy of coating, and by heat conduction suffered by coating to metal tube, the resistance toheat of coating can be improved.B component belongs to olefines thermosetting resin, and compare epoxy resin and polyureas coating, have higher acid-proof alkaline, add polytetrafluoro resinoid simultaneously, the frictional coefficient of material is little, and wear resisting property is high.
Embodiment
Embodiment 1
A kind of curable type tetrafluoroethylene/polyethylene kind inside lining anti-corrosive coating, is made up of component A and B component, wherein, component A is made up of each component of following parts by weight: linear low density polyethylene: 40 parts, linear high-density polyethylene 60 parts, polar elastomers: 10 parts, oxidation inhibitor: 0.1 part; Polycthylene grafted thing 10 parts; High-efficiency heat conduction filler 1 part; B component: linear high-density polyethylene: 30 parts, linear low density polyethylene: 70 parts, tetrafluoroethylene class powder: 5 parts, non-polar elastomer 5 parts, linking agent: 1 part, additional crosslinker: 1.5 parts.In the present embodiment, polar elastomers is ethylene-vinyl acetate copolymer, oxidation inhibitor is the composite antioxidant of phosphite ester kind antioxidant and Hinered phenols antioxidant composition, wherein phosphite ester kind antioxidant and Hinered phenols antioxidant are by weight 1: 0.3, polycthylene grafted thing is Research of Grafting Malaic Anhydride Onto Polyethylene, high-efficiency heat conduction filler is nanometer silicon carbide, tetrafluoroethylene class powder is tetrafluoroethylene-ethylene copolymer, non-polar elastomer is SBS, linking agent is 2, 5-dimethyl-2, two (t-butyl peroxy) hexane of 5-, additional crosslinker is cyanacrylate.
High density polyethylene(HDPE) density is 0.95-0.97g/cm
3, melt flow rate (MFR) 5-10g/10min; Linear low density polyethylene density is 0.93-0.94g/cm
3, melt flow rate (MFR) 5-10g/10min.
Preparation method: the preparation of (1) component A: by linear low density polyethylene and high density polyethylene(HDPE) in advance drying treatment to moisture content lower than 600ppm, and weigh in proportion with polar elastomers, grafts and thermal conducting agent, in homogenizer, fully mix 5 minutes; Then extruding pelletization in twin screw extruder, extrusion temperature is 200 DEG C, and screw speed is 300rpm, after extruding pelletization, powder is also dried to moisture content lower than 600ppm by abrasive dust 70 order, and finally in Surface Treatment with Plasma instrument, surface treatment 20 minutes is for subsequent use;
(2) preparation of B component: by high density polyethylene(HDPE) and linear low density polyethylene in advance drying treatment to moisture content lower than 600ppm, abrasive dust 35 order; Linking agent and additional crosslinker are weighed in proportion, and fully mix 5 minutes in magnetic stirrer; By the linking agent mixed, additional crosslinker with the polyethylene of abrasive dust, polytetrafluoro class powder and non-polar elastomer are weighed in proportion in advance, and in mould in mixing machine mix 5 minutes, then at 280 DEG C, screw speed is after 200rpm extruding pelletization, and powder is also dried to moisture content lower than 600ppm by abrasive dust 35 order;
(3) preparation of composite coating: in proportion 2/8 take component A and B component after, be separately stored in packaging.
Brushing method: with sandblast machine to pipe surface rust cleaning, process of deoiling; Steel pipe or equipment are placed in the device (being placed in for the equipment of the complex structure such as tank body, elbow, small volume, parts can the rotational molding machine of bidirectional rotation) horizontally rotated, when temperature reaches 220 DEG C, start to inject protective system component A in pipeline, stop after 2 minutes, protective system B component is injected in pipeline, the rotating speed of pipeline is brought up to 40 revs/min simultaneously, and continue to add 290 DEG C, after treating the whole melting of powder, be incubated 3 minutes, stop heating afterwards, by the self-heating of workpiece by powder levelling, be finally cooled to room temperature.
Embodiment 2:
A kind of curable type tetrafluoroethylene/polyethylene kind inside lining anti-corrosive coating, is made up of component A and B component, wherein, component A is made up of each component of following parts by weight: linear low density polyethylene: 70 parts, linear high-density polyethylene 30 parts, polar elastomers: 15 parts, oxidation inhibitor: 0.3 part; Polycthylene grafted thing 20 parts; High-efficiency heat conduction filler 5 parts; B component: linear high-density polyethylene: 70 parts, linear low density polyethylene: 30 parts, tetrafluoroethylene class powder: 10 parts, non-polar elastomer 10 parts, linking agent: 0.8 part, additional crosslinker: 1.2 parts.In the present embodiment, polar elastomers is ethylene-acrylic acid copolymer, oxidation inhibitor is the composite antioxidant of phosphite ester kind antioxidant and Hinered phenols antioxidant composition, wherein phosphite ester kind antioxidant and Hinered phenols antioxidant are by weight 1: 0.7, polycthylene grafted thing is polypropylene grafted maleic anhydride, high-efficiency heat conduction filler is aluminium nitride, tetrafluoroethylene class powder is ethene and TFE copolymer, non-polar elastomer is SEBS, linking agent is 2, two (t-butyl peroxy) hexane of 5-dimethyl-2,5-, additional crosslinker is triallylcyanurate.
High density polyethylene(HDPE) density is 0.95-0.97g/cm
3, melt flow rate (MFR) 5-10g/10min; Linear low density polyethylene density is 0.93-0.94g/cm
3, melt flow rate (MFR) 5-10g/10min.
Preparation method: the preparation of (1) component A: by linear low density polyethylene and high density polyethylene(HDPE) in advance drying treatment to moisture content lower than 600ppm, and weigh in proportion with polar elastomers, grafts and thermal conducting agent, in homogenizer, fully mix 5 minutes; Then extruding pelletization in twin screw extruder, extrusion temperature is 200 DEG C, and screw speed is 300rpm, after extruding pelletization, powder is also dried to moisture content lower than 600ppm by abrasive dust 70 order, and finally in Surface Treatment with Plasma instrument, surface treatment 20 minutes is for subsequent use;
(2) preparation of B component: by high density polyethylene(HDPE) and linear low density polyethylene in advance drying treatment to moisture content lower than 600ppm, abrasive dust 35 order; Linking agent and additional crosslinker are weighed in proportion, and fully mix 5 minutes in magnetic stirrer; By the linking agent mixed, additional crosslinker with the polyethylene of abrasive dust, polytetrafluoro class powder and non-polar elastomer are weighed in proportion in advance, and in mould in mixing machine mix 5 minutes, then at 280 DEG C, screw speed is after 200rpm extruding pelletization, and powder is also dried to moisture content lower than 600ppm by abrasive dust 35 order;
(3) preparation of composite coating: in proportion 1/9 take component A and B component after, be separately stored in packaging.
Brushing method: with sandblast machine to pipe surface rust cleaning, process of deoiling; Steel pipe or equipment are placed in the device (being placed in for the equipment of the complex structure such as tank body, elbow, small volume, parts can the rotational molding machine of bidirectional rotation) horizontally rotated, when temperature reaches 220 DEG C, start to inject protective system component A in pipeline, stop after 4 minutes, protective system B component is injected in pipeline, the rotating speed of pipeline is brought up to 50 revs/min simultaneously, and continue to add 300 DEG C, after treating the whole melting of powder, be incubated 2 minutes, stop heating afterwards, by the self-heating of workpiece by powder levelling, be finally cooled to room temperature.
Embodiment 3
A kind of curable type tetrafluoroethylene/polyethylene kind inside lining anti-corrosive coating, is made up of component A and B component, wherein, component A is made up of each component of following parts by weight: linear low density polyethylene: 50 parts, linear high-density polyethylene 50 parts, polar elastomers: 20 parts, oxidation inhibitor: 0.3 part; Polycthylene grafted thing 20 parts; High-efficiency heat conduction filler 4 parts; B component: linear high-density polyethylene: 50 parts, linear low density polyethylene: 50 parts, tetrafluoroethylene class powder: 20 parts, non-polar elastomer 6 parts, linking agent: 0.5 part, additional crosslinker: 1.2 parts.In the present embodiment, polar elastomers is ethylene-vinyl acetate copolymer, oxidation inhibitor is the composite antioxidant of phosphite ester kind antioxidant and Hinered phenols antioxidant composition, wherein phosphite ester kind antioxidant and Hinered phenols antioxidant are by weight 1: 0.5, polycthylene grafted thing is Research of Grafting Malaic Anhydride Onto Polyethylene, high-efficiency heat conduction filler is nanometer silicon carbide, tetrafluoroethylene class powder is tetrafluoroethylene, non-polar elastomer is SBS, linking agent is 2, two (t-butyl peroxy) hexane of 5-dimethyl-2,5-, additional crosslinker is cyanacrylate.
High density polyethylene(HDPE) density is 0.95-0.97g/cm
3, melt flow rate (MFR) 5-10g/10min; Linear low density polyethylene density is 0.93-0.94g/cm
3, melt flow rate (MFR) 5-10g/10min.
Preparation method: the preparation of (1) component A: by linear low density polyethylene and high density polyethylene(HDPE) in advance drying treatment to moisture content lower than 600ppm, and weigh in proportion with polar elastomers, grafts and thermal conducting agent, in homogenizer, fully mix 5 minutes; Then extruding pelletization in twin screw extruder, extrusion temperature is 200 DEG C, and screw speed is 300rpm, after extruding pelletization, powder is also dried to moisture content lower than 600ppm by abrasive dust 70 order, and finally in Surface Treatment with Plasma instrument, surface treatment 20 minutes is for subsequent use;
(2) preparation of B component: by high density polyethylene(HDPE) and linear low density polyethylene in advance drying treatment to moisture content lower than 600ppm, abrasive dust 35 order; Linking agent and additional crosslinker are weighed in proportion, and fully mix 5 minutes in magnetic stirrer; By the linking agent mixed, additional crosslinker with the polyethylene of abrasive dust, polytetrafluoro class powder and non-polar elastomer are weighed in proportion in advance, and in mould in mixing machine mix 5 minutes, then at 280 DEG C, screw speed is after 200rpm extruding pelletization, and powder is also dried to moisture content lower than 600ppm by abrasive dust 35 order;
(3) preparation of composite coating: in proportion 5/5 take component A and B component after, be separately stored in packaging.
Brushing method: with sandblast machine to pipe surface rust cleaning, process of deoiling; Steel pipe or equipment are placed in the device (being placed in for the equipment of the complex structure such as tank body, elbow, small volume, parts can the rotational molding machine of bidirectional rotation) horizontally rotated, when temperature reaches 220 DEG C, start to inject protective system component A in pipeline, stop after 3 minutes, protective system B component is injected in pipeline, the rotating speed of pipeline is brought up to 60 revs/min simultaneously, and continue to add 300 DEG C, after treating the whole melting of powder, be incubated 4 minutes, stop heating afterwards, by the self-heating of workpiece by powder levelling, be finally cooled to room temperature.
Embodiment 4:
Substantially the same manner as Example 1, difference is polar elastomers is polyester type elastomer body.
Embodiment 5:
Substantially the same manner as Example 1, difference is high-efficiency heat conduction filler is magnesium oxide or aluminum oxide.
Embodiment 6:
Substantially the same manner as Example 1, difference be component A wherein, component A is made up of each component of following parts by weight: linear low density polyethylene: 60 parts, linear high-density polyethylene 40 parts, polar elastomers: 30 parts, oxidation inhibitor: 0.5 part; Polycthylene grafted thing 30 parts; High-efficiency heat conduction filler 5 parts; B component: linear high-density polyethylene: 60 parts, linear low density polyethylene: 40 parts, tetrafluoroethylene class powder: 30 parts, linking agent: 0.1 part, additional crosslinker: 0.2 part.
Embodiment 7:
Substantially the same manner as Example 1, difference be component A wherein, component A is made up of each component of following parts by weight: linear low density polyethylene: 50 parts, linear high-density polyethylene 50 parts, polar elastomers: 25 parts, oxidation inhibitor: 0.3 part; Polycthylene grafted thing 25 parts; B component: linear high-density polyethylene: 50 parts, linear low density polyethylene: 50 parts, linking agent: 0.7 part, additional crosslinker: 1 part.
Embodiment 8:
Substantially the same manner as Example 1, difference is polytetrafluoro class powder is tetrafluoroethylene and hexafluoroethylene copolymer.
In order to prove beneficial effect of the present invention further: enumerate following test example: as table one:
Table 1 double layer anticorrosive coating property data
Claims (5)
1. curable type tetrafluoroethylene/polyethylene kind inside lining anti-corrosive coating, it is characterized in that: described protective system is made up of component A and B component, A: B=1: 9-5: 5, wherein, component A is made up of each component of following parts by weight: linear low density polyethylene: 40-70 part, linear high-density polyethylene 60-30 part, polar elastomers: 10-30 part, oxidation inhibitor: 0.1-0.5 part, polycthylene grafted thing 10-30 part, high-efficiency heat conduction filler 0-5 part, B component: linear high-density polyethylene: 30-70 part, linear low density polyethylene: 70-30 part, tetrafluoroethylene class powder: 0-30 part, non-polar elastomer 0-10 part, linking agent: 0.1-1 part, additional crosslinker: 0.2-1.5 part, described polycthylene grafted thing is Research of Grafting Malaic Anhydride Onto Polyethylene, described polar elastomers is ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, one or more in polyester type elastomer body, non-polar elastomer is SBS, SEP, one or several in SEBS, high-efficiency heat conduction filler is nanometer silicon carbide, aluminium nitride, boron nitride, magnesium oxide, aluminum oxide, one or several in powdered graphite, the brushing method of foregoing curable type tetrafluoroethylene/polyethylene kind inside lining anti-corrosive coating: comprise the following steps:
1) with sandblast machine to pipe surface to be sprayed rust cleaning, process of deoiling;
2) steel pipe or equipment are placed in horizontally rotate or the device of bidirectional rotation when temperature reaches 220 DEG C, start to inject protective system component A in pipeline, stop 2-4 minute, after treating the whole melting of powder, in pipeline, inject protective system B component, the rotating speed of pipeline is brought up to 40-80 rev/min simultaneously, and continue to add 220-300 DEG C, after treating the whole melting of powder, insulation 2-4 minute;
3) stop heating, by the self-heating of workpiece by powder levelling, be finally cooled to room temperature.
2. curable type tetrafluoroethylene/polyethylene kind inside lining anti-corrosive coating as claimed in claim 1, it is characterized in that: described linking agent is peroxide type linking agent, be 2, 5-dimethyl-2, two (t-butyl peroxy) hexane of 5-, two 2 4-[two (2, 4-dichloro-benzoyl) superoxide, peroxidation two (4-toluyl), dicumyl peroxide, two (t-butylperoxyisopropyl) benzene, 1, 1-di-t-butyl methyl-3, 5, 5-trimethyl-cyclohexane, 1, 1-di-t-butyl methyl-3, 5, one or more mixing in 5-trimethyl-cyclohexane.
3. curable type tetrafluoroethylene/polyethylene kind inside lining anti-corrosive coating as claimed in claim 1, it is characterized in that: described additional crosslinker is cyanacrylate, triallylcyanurate, one or more mixing in trimethylolpropane trimethacrylate.
4. curable type tetrafluoroethylene/polyethylene kind inside lining anti-corrosive coating as claimed in claim 1, it is characterized in that: described oxidation inhibitor is the composite antioxidant of phosphite ester kind antioxidant and Hinered phenols antioxidant composition, wherein phosphite ester kind antioxidant and Hinered phenols antioxidant are by weight 1: 0.3 ~ 1: 0.7 composition.
5. curable type tetrafluoroethylene/polyethylene kind inside lining anti-corrosive coating as claimed in claim 1, is characterized in that: described tetrafluoroethylene class powder is one or several in tetrafluoroethylene, tetrafluoroethylene and hexafluoropropylene copolymer, ethene and TFE copolymer.
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| CN107474654A (en) * | 2017-09-29 | 2017-12-15 | 安徽德全新型建材科技有限公司 | A kind of cold water water pipe heat insulation coating |
| CN111826014B (en) * | 2020-07-17 | 2021-09-03 | 浙江乐酷厨具有限公司 | Non-stick pan with modified tetrafluoroethylene coating and preparation method thereof |
| CN112521645A (en) * | 2020-12-10 | 2021-03-19 | 单县兴源塑胶阀门有限公司 | High-strength wear-resistant plastic valve pipe fitting and preparation method thereof |
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| CN101929155B (en) * | 2010-08-30 | 2013-03-13 | 浙江中隧桥波形钢腹板有限公司 | Heavy-duty anticorrosion protection process of hollow steel pipe pile |
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