CN111793413A - Powder coating for lining plastic, composite master batch and lining plastic composite pipe - Google Patents
Powder coating for lining plastic, composite master batch and lining plastic composite pipe Download PDFInfo
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- CN111793413A CN111793413A CN202010644683.XA CN202010644683A CN111793413A CN 111793413 A CN111793413 A CN 111793413A CN 202010644683 A CN202010644683 A CN 202010644683A CN 111793413 A CN111793413 A CN 111793413A
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- 238000000576 coating method Methods 0.000 title claims abstract description 102
- 239000011248 coating agent Substances 0.000 title claims abstract description 97
- 239000000843 powder Substances 0.000 title claims abstract description 91
- 229920003023 plastic Polymers 0.000 title claims abstract description 56
- 239000004033 plastic Substances 0.000 title claims abstract description 56
- 239000002131 composite material Substances 0.000 title claims abstract description 50
- 239000004594 Masterbatch (MB) Substances 0.000 title claims abstract description 43
- 239000000463 material Substances 0.000 claims abstract description 74
- 229920005989 resin Polymers 0.000 claims abstract description 66
- 239000011347 resin Substances 0.000 claims abstract description 66
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 63
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 63
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims abstract description 31
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- 229920001225 polyester resin Polymers 0.000 claims abstract description 31
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- 238000000034 method Methods 0.000 claims abstract description 21
- -1 polyethylene Polymers 0.000 claims abstract description 15
- 239000004698 Polyethylene Substances 0.000 claims abstract description 14
- 239000000314 lubricant Substances 0.000 claims abstract description 14
- 229920000573 polyethylene Polymers 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 21
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 19
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- OUPZKGBUJRBPGC-UHFFFAOYSA-N 1,3,5-tris(oxiran-2-ylmethyl)-1,3,5-triazinane-2,4,6-trione Chemical group O=C1N(CC2OC2)C(=O)N(CC2OC2)C(=O)N1CC1CO1 OUPZKGBUJRBPGC-UHFFFAOYSA-N 0.000 claims description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 6
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to a powder coating for plastic lining, a composite master batch and a plastic lining composite pipe, wherein the powder coating for plastic lining at least comprises resin, filler and an auxiliary agent, the resin comprises a resin base material and a resin proportioning material, the filler comprises graphene, the graphene is prefabricated into the composite master batch by the graphene and the resin proportioning material and added into the powder coating, the resin is preferably carboxyl polyester resin, the auxiliary agent preferably comprises a lubricant polyethylene wax, the graphene and the resin proportioning material are mixed, dispersed and then crushed or granulated, or the graphene is firstly dispersed into the lubricant and then mixed, dispersed and then crushed or granulated with the resin proportioning material to obtain the composite master batch, and then the composite master batch, the resin base material and other raw materials are used for preparing the powder coating. According to the invention, by optimizing the coating components and optimizing the graphene addition process, on the basis of ensuring the optimal mechanical, chemical and thermal properties of the coating, the rapid batching is realized, the operation time is reduced, and a way is provided for the industrial application of the graphene in the plastic-lined powder coating.
Description
Technical Field
The invention relates to the technical field of powder coating, in particular to powder coating for plastic lining (comprising a preparation method thereof), composite master batch and a plastic lining composite pipe.
Background
At present, most of the anticorrosion of the steel-plastic pipeline still adopts the traditional paint coating process, so that the environment pollution is caused, the production efficiency is low, the waste of raw materials is serious, the anticorrosion effect is poor, the adhesion force is poor, the paint surface is easy to peel off, the coating needs to be carried out again at intervals, the powder coating has excellent anticorrosion performance, harmful substances cannot be generated in the production process and the actual use, the powder coating belongs to an environment-friendly anticorrosion material, the adsorption force with the pipeline is strong, the service life is long, the production process is simple, the anticorrosion efficiency is greatly improved, the powder coating has wide application in the pipeline industry, for example, the anticorrosion engineering of the steel-plastic pipeline mostly adopts powder coating to line plastic. The basic components of the powder coating for lining plastics generally comprise resin, pigment/filler and auxiliary agent, and the quality of a coating film depends on the formula composition, the processing method and the coating condition. The resin is one of the main components of the powder coating, and many thermoplastic resins such as polyamide, polyolefin, polyvinyl chloride, polyester, polyvinylidene fluoride, etc. and thermosetting resins such as epoxy, polyester, pure polyester, acrylic, polyurethane, etc. can be used as the binder, but the film forming and spreading effects need to be carefully selected according to the application conditions and the overall composition of the coating. The curing agent is a processing aid applied to thermosetting powder coating, and reacts with resin under a certain curing condition in the coating construction process to form a body-shaped structure, and the linear structure with stable resin chemical chain segments is converted into a criss-cross reticular chain segment structure, so that the mechanical strength and the chemical stability of the surface coating film are improved. Pigments are an important component of colored powder coatings and generally have optical protective and decorative effects. The filler is an additive which plays a skeleton role in the powder coating, enhances the steady-state supporting performance of a coating film and improves the chemical stability, and is usually an inorganic substance. Powder coating additives are chemicals added to powder coating binders to ensure the smooth production of the polymer binders and to obtain the desired application properties or to improve certain of the material's own use properties, and can generally be divided into two categories: one is to change only the physical properties of the polymer without changing the chemical structure of the polymer, such as defoaming agents, wetting agents, dry powder flow promoters, etc.; one is to change the chemical structure of the polymer more or less, such as curing agents, reactive matting agents, etc.
Some steel-plastic pipelines applied in petrochemical industry have higher requirements on mechanical wear resistance and heat conduction performance besides higher requirements on the coating quality and chemical stability of the plastic lining layer, and in the prior art, some inorganic fillers matched with corresponding performance are usually added to improve the performance of the plastic lining layer, but the increase of the amount of the fillers to a certain degree adversely affects the strength and chemical stability of the whole plastic lining layer. The graphene material has good mechanical strength and heat conduction performance, is widely applied in the industries of petrochemical industry and the like in recent years, some colleges and enterprises in China have developed research on the powder coating containing the graphene material, and the graphene material is preliminarily found to have a certain enhancement effect on the mechanical strength of a coating film, but no clear industrial application guidance is given, and no feasible process scheme is provided specially for steel-plastic pipelines.
Disclosure of Invention
The invention aims to provide a powder coating for lining plastic, which improves the mechanical wear-resisting strength and the heat conduction performance of a steel-plastic pipeline coating film on the basis of ensuring the integral strength and the chemical stability of the coating film by preferably selecting resin-based coating components and introducing a graphene material into the powder coating, and simultaneously solves the problem of time consumption of graphene material dispersion and improves the dispersion effect while realizing proportioning according to needs by optimizing the introduction and addition processes of the graphene.
The invention provides a powder coating for lining plastic, which has the technical scheme that:
a plastic-lined powder coating at least comprises resin, filler and an auxiliary agent, wherein the resin comprises a resin base material and a resin proportioning material, the filler comprises graphene, the graphene and the resin proportioning material are prefabricated into a composite master batch and added into the powder coating, and the mass ratio of the resin base material to the resin proportioning material is 1:0.1-10, preferably 1:0.2-5, more preferably 1: 0.5-2; the content of the graphene in the composite master batch is 0.05-20%, preferably 0.1-10%, and more preferably 0.2-5%.
The resin base material and the resin proportioning material both comprise carboxyl polyester resin, and the composite master batch is obtained by mixing, dispersing and crushing or granulating the graphene and the resin proportioning material, namely the carboxyl polyester resin.
According to the powder coating for lining plastic, the resin base material and the resin proportioning material both comprise carboxyl polyester resin, the auxiliary agent comprises a lubricant, the lubricant comprises polyethylene wax, and the graphene is firstly dispersed into the lubricant polyethylene wax, then is mixed with the resin proportioning material carboxyl polyester resin, and is crushed or granulated to obtain the composite master batch.
The powder coating for lining plastic comprises barium sulfate and quartz powder, wherein the mass ratio of the graphene to the barium sulfate to the quartz powder is 1:0.2-5:0.2-5, and preferably 1:0.5-2: 0.5-2.
The powder coating for lining plastic comprises a curing agent in the auxiliary agent, wherein the curing agent is triglycidyl isocyanurate.
A powder coating for lining plastics as described above, the adjuvant comprising a flow agent and/or an air release agent, the flow agent comprising an acrylate and the air release agent comprising a benzine.
The invention also provides a preparation method of the powder coating for plastic lining, which adopts the following technical scheme:
a preparation method of a powder coating for lining plastic comprises the following steps:
(1) preparing a composite master batch:
mixing, dispersing and then crushing or granulating the graphene filler and the resin proportioning material, or dispersing the graphene filler into an auxiliary lubricant, then mixing, dispersing and then crushing or granulating the graphene filler and the resin proportioning material to obtain a composite master batch;
(2) preparing a powder coating:
and (2) weighing the composite master batch prepared in the step (1) according to the set raw material proportion of the powder coating, fully mixing or kneading the composite master batch with the resin base material, other fillers and auxiliaries, and grinding or granulating to obtain the powder coating.
The dispersion method in the step (1) is a melt dispersion method or a liquid phase dispersion method (chemical dissolution or oil liquid dispersion).
The invention also provides a composite master batch, which adopts the technical scheme as follows:
the composite master batch is obtained by mixing and dispersing graphene and a resin proportioning material and then crushing or granulating, and is used for the powder coating for plastic lining.
The invention also provides a plastic-lined composite pipe, which adopts the technical scheme as follows:
the plastic-lined composite pipe is obtained by carrying out single-layer or multi-layer plastic lining on a pretreated metal pipe, wherein the plastic lining adopts the powder coating.
The applied principle and the obtained technical effect of the invention are as follows:
the graphene is a high-efficiency wear-resistant heat conduction material, experiments prove that the wear resistance and the heat conductivity coefficient of a coating film can be improved by multiple times by adding the graphene material into a plastic lining material, so that the graphene dosage can be determined according to the working condition and the performance requirement of a steel-plastic pipeline in production, the scheme of the invention innovatively divides the resin material into a resin base material and a resin proportioning material, the graphene material and the resin proportioning material are prefabricated into a composite master batch according to a proportion, then the composite master batch is proportioned with the resin base material without the graphene material, variable and serial graphene proportioning can be obtained by regulating the resin base material dosage, the graphene is pre-dispersed in the resin proportioning material by a melt dispersion method or a liquid phase dispersion method, the problem that the graphene material is dispersed and consumed in time during online batching can be solved, and when a powder coating is prepared online, the composite master batch can be mixed and dispersed with resin and other raw materials according to a set production, the mixing and grinding time can be greatly shortened, and the production efficiency is improved; the carboxyl polyester resin which has good bonding property with graphene and lower cost is selected as a resin material, the acid value is moderate (about 35mgKOH/g), the resin material is cured by triglycidyl isocyanurate, the coating adhesion is high, the chemical property is stable, the polyethylene wax has a lubricating effect firstly in the invention, the scratch resistance of the coating and the slip property of powder can be improved, the more obvious effect is the dissociation effect on the graphene, the polyethylene wax is firstly used for dissociating and agglomerating the graphene lamellar structure, and then the semi-finished product proportioning material is prefabricated, the graphene can be dispersed more fully, the production period is further shortened, and the advantages of the graphene lamellar structure are played; in addition, the acrylic ester flow assistant selected by the invention is a homopolymer, can eliminate leveling defects such as shrinkage cavity, pockmarks and the like in the coating curing process, the selected barium sulfate has the functions of enhancing and light stabilizing, can protect a paint film from light aging, has a needle-shaped crystal structure to become a good flatting agent, can enhance the leveling property of a coating, and can improve the hardness of powder and increase the physical and mechanical properties of the powder coating.
In conclusion, the graphene material is introduced into the powder coating, the mechanical strength and the heat conduction performance of the steel-plastic pipeline coating are improved on the basis of ensuring the overall strength and the chemical stability of the coating by preferably selecting the components of the resin-based coating, the graphene is introduced and added according to the required proportion, the problem of time consumption for dispersing the graphene material during online batching is solved, the dispersion effect is improved, and a way is provided for the industrial application of the graphene in the plastic-lined powder coating.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The powder coating for lining plastic comprises, by weight, 30-120 parts of carboxyl polyester resin, 1-30 parts of filler and 1-30 parts of auxiliary agent, wherein the carboxyl polyester resin is distributed by a carboxyl polyester resin base material and a carboxyl polyester resin proportioning material according to a mass ratio of 1:0.1-10, the filler is composed of graphene, barium sulfate and quartz powder according to a mass ratio of 1:0.2-5:0.2-5, and the auxiliary agent is composed of curing agent triglycidyl isocyanurate, lubricant polyethylene wax, flow agent acrylate and degassing agent benzidine according to empirical dosage.
The preparation method of the powder coating for lining plastic comprises the following steps:
(1) preparing a composite master batch:
mixing and dispersing graphene and carboxyl polyester resin serving as a resin proportioning material, and crushing or granulating to prepare a composite master batch;
(2) preparing a powder coating:
and (2) weighing the composite master batch prepared in the step (1) according to the set raw material proportion of the powder coating, fully mixing or kneading the composite master batch with the resin base material, other fillers and auxiliaries, and grinding or granulating to obtain the powder coating.
Example 2
The powder coating for lining plastic comprises, by weight, 30-120 parts of carboxyl polyester resin, 1-30 parts of filler and 1-30 parts of auxiliary agent, wherein the carboxyl polyester resin is prepared from a carboxyl polyester resin base material and a carboxyl polyester resin proportioning material in a mass ratio of 1:0.1-10, the filler is prepared from graphene, barium sulfate and quartz powder in a mass ratio of 1:0.2-5:0.2-5, and the auxiliary agent is prepared from curing agent triglycidyl isocyanurate, lubricant polyethylene wax, flow agent acrylate and degassing agent benzidine in empirical amount, wherein the amount of the lubricant polyethylene wax is not less than that of the graphene filler.
The preparation method of the powder coating for lining plastic comprises the following steps:
(1) preparing a composite master batch:
dispersing graphene into lubricant polyethylene wax, mixing with carboxyl polyester resin serving as a resin proportioning material, dispersing, and then crushing or granulating to prepare a composite master batch;
(2) preparing a powder coating:
and (2) weighing the composite master batch prepared in the step (1) according to the set raw material proportion of the powder coating, fully mixing or kneading the composite master batch with the resin base material, other fillers and auxiliaries, and grinding or granulating to obtain the powder coating.
In the above examples 1 and 2, the carboxyl polyester resin is preferably distributed by the carboxyl polyester resin base material and the carboxyl polyester resin mixture according to the mass ratio of 1:0.2-5, more preferably by the carboxyl polyester resin base material and the carboxyl polyester resin mixture according to the mass ratio of 1:0.5-2, the content ratio of graphene in the composite master batch is 0.05-20%, preferably 0.1-10%, more preferably 0.2-5%, and the filler is preferably composed of graphene, barium sulfate and quartz powder according to the mass ratio of 1:0.5-2: 0.5-2.
Example 3
The powder coating for lining plastic comprises, by weight, 20 parts of a carboxyl polyester resin base material, 70 parts of a carboxyl polyester resin proportioning material, 3 parts of graphene, 4 parts of barium sulfate, 4 parts of quartz powder, 7 parts of triglycidyl isocyanurate, 2 parts of polyethylene wax, 2 parts of acrylate and 2 parts of benzyl factors. Mixing 3 parts of graphene and 70 parts of carboxyl polyester resin serving as a resin proportioning material by a melting method, granulating, crushing to obtain a uniform particle size to prepare a composite master batch, treating the prepared composite master batch and the rest raw materials in a high-speed premixer for 25min, uniformly mixing, performing melt extrusion by a screw extruder, and performing graded crushing to obtain the powder coating.
Example 4
The powder coating for lining plastic comprises, by weight, 30 parts of a carboxyl polyester resin base material, 80 parts of a carboxyl polyester resin proportioning material, 2 parts of graphene, 4 parts of barium sulfate, 4 parts of quartz powder, 8 parts of triglycidyl isocyanurate, 5 parts of polyethylene wax, 2.5 parts of acrylate and 2.5 parts of benzidine. Carrying out ultrasonic dispersion on 2 parts of graphene in molten polyethylene wax, adding 80 parts of carboxyl polyester resin serving as a resin proportioning material, continuously mixing, carrying out crushing processing after granulation to obtain a composite master batch, treating the prepared composite master batch and the rest raw materials in a high-speed premixer for 20min, uniformly mixing, carrying out melt extrusion by using a screw extruder, and carrying out graded crushing to obtain the powder coating.
Verification example 1
Powder coating injection molding samples are respectively manufactured according to the processes of the embodiment 3 and the embodiment 4, 15-20 samples in each batch are verified, strength detection, hydrostatic pressure test and thermal conductivity detection are carried out according to ISO and GBT standards, the average tensile strength is more than or equal to 48MPa, the average tensile strength exceeds the same powder coating sample which is used before and is not added with graphene by more than 20%, the powder coating sample does not have crack penetration at 100% under the condition of 95 ℃/165h, and the average thermal conductivity is more than or equal to 4.0W/(m.k).
Verification example 2
The powder coating prepared in the embodiment 3 and the embodiment 4 is adopted to prepare a steel-plastic pipeline sample according to a set process flow, and the specific process comprises the following steps: polishing the inner surface and the outer surface of a steel-plastic pipe fitting, removing rust, oil stains and stains on the surface of the pipe fitting, and improving the surface roughness, so as to increase the adhesive force in the plastic lining process of the powder coating, placing the pipe fitting in a heating furnace for heating, taking out the pipe fitting, placing the powder coatings prepared in the embodiment 3 and the embodiment 4 on the surface of the heated pipe fitting, continuously rotating the pipe fitting to enable the powder coatings to be continuously and uniformly melted on the surface of the pipe fitting, placing the pipe fitting with the plastic lining in a fluidized bed, continuously rotating the pipe fitting at a constant speed until the temperature is reduced below the melting point of the powder coatings, solidifying the plastic lining layer, heating the outer wall of the pipe fitting by using a heating device, completely fusing the plastic lining layer which is not completely fused, increasing the compactness and the hardness of the plastic lining layer, and hanging the pipe fitting with the solidified plastic lining layer in the air for. The steel-plastic pipeline samples prepared by the process are detected, the appearance of the plastic lining layer is smooth and flat, no impurities or bubbles exist, and the adhesive force of the plastic lining layer reaches the GB1720 standard level 1.
Claims (10)
1. A powder coating for plastic lining at least comprises resin, filler and auxiliaries, and is characterized in that the resin comprises a resin base material and a resin proportioning material, the filler comprises graphene, the graphene and the resin proportioning material are prefabricated into a composite master batch and added into the powder coating, and the mass ratio of the resin base material to the resin proportioning material is 1:0.1-10, preferably 1:0.2-5, and more preferably 1: 0.5-2; the content of the graphene in the composite master batch is 0.05-20%, preferably 0.1-10%, and more preferably 0.2-5%.
2. A plastic-lined powder coating as claimed in claim 1, wherein the resin base material and the resin matching material both comprise carboxyl polyester resin, and the composite masterbatch is obtained by mixing, dispersing and crushing or granulating the graphene and the resin matching material carboxyl polyester resin.
3. A plastic-lined powder coating as claimed in claim 1, wherein the resin base material and the resin formulation comprise carboxyl polyester resin, the adjuvant comprises a lubricant, the lubricant comprises polyethylene wax, and the graphene is dispersed in the polyethylene wax as the lubricant, and then the graphene is mixed with the carboxyl polyester resin as the resin formulation, dispersed, and crushed or granulated to obtain the composite masterbatch.
4. A lining plastic powder coating as claimed in claim 1, wherein the filler further comprises barium sulfate and quartz powder, and the mass ratio of the graphene to the barium sulfate to the quartz powder is 1:0.2-5:0.2-5, preferably 1:0.5-2: 0.5-2.
5. A lining powder coating as claimed in claim 2 or claim 3, wherein the adjuvant includes a curing agent, and the curing agent is triglycidyl isocyanurate.
6. A lining powder coating as claimed in claim 1, wherein said adjuvant includes a flow agent and/or an air release agent, said flow agent includes an acrylate, and said air release agent includes a benzine.
7. A method for preparing a powder coating for lining plastics, which is characterized in that the powder coating is the powder coating of any one of claims 1 to 6, and the preparation method comprises the following steps:
(1) preparing a composite master batch:
mixing, dispersing and then crushing or granulating the graphene filler and the resin proportioning material, or dispersing the graphene filler into an auxiliary lubricant, then mixing, dispersing and then crushing or granulating the graphene filler and the resin proportioning material to obtain a composite master batch;
(2) preparing a powder coating:
weighing the composite master batch prepared in the step (1) according to the set raw material proportion of the powder coating, fully mixing or kneading the composite master batch with the resin base material, other fillers and auxiliaries, and grinding or granulating to obtain the powder coating as claimed in any one of claims 1 to 6.
8. A method for preparing a powder coating for lining plastics according to claim 7, wherein the dispersion method in the step (1) is a melt dispersion method or a liquid phase dispersion method.
9. A composite masterbatch obtained by mixing, dispersing and crushing or granulating graphene and a resin batch, wherein the composite masterbatch is used for the powder coating of any one of claims 1 to 6.
10. A plastic-lined composite pipe obtained by single-layer or multi-layer plastic lining of a pretreated metal pipe, characterized in that the plastic lining uses the powder coating as claimed in any one of claims 1 to 6.
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Denomination of invention: Powder coatings, composite masterbatches, and composite pipes for plastic lining Granted publication date: 20220222 Pledgee: Rizhao Bank Co.,Ltd. Jining Rencheng sub branch Pledgor: SHANDONG SHANGHE POWER TECHNOLOGY Co.,Ltd. Registration number: Y2024980000384 |