CN107513334B - Low-temperature curing insulating epoxy powder coating - Google Patents
Low-temperature curing insulating epoxy powder coating Download PDFInfo
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- CN107513334B CN107513334B CN201710848822.9A CN201710848822A CN107513334B CN 107513334 B CN107513334 B CN 107513334B CN 201710848822 A CN201710848822 A CN 201710848822A CN 107513334 B CN107513334 B CN 107513334B
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- 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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
- B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
- B29B7/18—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft
- B29B7/20—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
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- 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
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- 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
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- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
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- 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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Abstract
A low-temperature curing insulating epoxy powder coating comprises the following components in parts by weight: epoxy resin: 30-40 parts of carboxyl end group polyester resin: 25-35 parts of low-temperature curing agent: 3-8 parts of titanium dioxide: 3-7 parts of a toughening agent: 3-5 parts of a curing accelerator: 1-3 parts of inorganic filler: 15-25 parts of a leveling agent: 0-5 parts of antistatic agent: 0-1 part of a silane coupling agent: 0.2-1 part. The preparation method of the coating comprises the following steps: comprises weighing, mixing, extruding granules, tabletting, crushing, sieving and packaging. Wherein the mixing adopts a double-cylinder conjoined mixer. The double-cylinder conjoined mixer comprises a main cylinder, a secondary cylinder and a base; the secondary cylinder is in the main cylinder, and the axis of the secondary cylinder coincides with the axis of the main cylinder. The coating disclosed by the invention has good insulating property and strength, is low in curing temperature, and can be suitable for a spraying substrate which is not high in temperature resistance.
Description
Technical Field
The invention relates to the field of electronic component powder coatings, in particular to a low-temperature curing insulating epoxy powder coating.
Background
In recent years, the international coating technology of epoxy insulation powder is widely applied to insulation of busbars, copper bars, circuit breakers, switch cabinets, insulators, bus ducts and other electrical elements needing high voltage resistance. The powder coating contains 100 percent of solid components, does not contain chemical solvents completely, does not pollute the environment, does not harm human bodies, is the most advanced and environment-friendly product at present, and is a development trend of the coating industry by replacing liquid coating with the coating coated in the powder industry. However, the development of the powder coating industry is still immature, especially for epoxy powder coatings, which have high curing temperature and are difficult to use for substrates that cannot be adapted to the high temperature, and furthermore, the insulation effect of the epoxy powder coatings on the market is limited, so that improvement and improvement of the existing epoxy powder coating formulation is required.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an insulating epoxy powder coating which has a good adhesion effect at low temperature. The specific scheme for realizing the purpose is as follows:
a low-temperature curing insulating epoxy powder coating comprises the following components in parts by weight: epoxy resin: 30-40 parts of carboxyl end group polyester resin: 25-35 parts of low-temperature curing agent: 3-8 parts of titanium dioxide: 3-7 parts of a toughening agent: 3-5 parts of a curing accelerator: 1-3 parts of inorganic filler: 15-25 parts of a leveling agent: 0-5 parts of antistatic agent: 0-1 part of a silane coupling agent: 0.2-1 part. Wherein, the main components are epoxy resin, carboxyl end-grade polyester resin and inorganic filler; the additive is low-temperature curing agent, titanium dioxide, toughening agent, curing accelerator, leveling agent antistatic agent and silane coupling agent.
The epoxy resin has an epoxy equivalent of 700-2500 (g/equivalent) and a softening point of 75-150 ℃; the epoxy resin is the main base material of the insulating powder coating and determines the adhesion of the coating to a substrate, so that the physical and chemical properties of the epoxy resin used for the formula are stable.
The carboxyl-terminated polyester resin has a curing temperature of 110-130 ℃ and a glass transition temperature of 50-100 ℃; the carboxyl-terminated polyester resin can be cured at a low temperature of about 125 ℃ and has good stability, so that the fluidity of the coating can be improved, and the curing temperature of the coating can be reduced.
The toughening agent is in-situ polymerized poly-p-benzamide; the coating is beneficial to enhancing the toughness and the dielectric breakdown resistance of the coating and has a supplementary effect on the edge coverage of the coating.
The low-temperature curing agent is N- (3, 4-dichlorophenyl); the low temperature curing agent is mainly used for curing epoxy resin.
The curing accelerator is one of triphenyl ethyl phosphonium iodide or triphenyl ethyl phosphonium bromide; the curing accelerators are used primarily for curing carboxyl-terminated polyester resins.
The inorganic filler is one of precipitated barium sulfate or nano silicon dioxide. The leveling agent is an acrylate leveling agent. The antistatic agent is an oleamide antistatic agent.
The silane coupling agent has a wetting effect and can increase the adhesion of the coating to the substrate. The titanium dioxide is an excellent insulator and is also a pigment of the coating, has high resistivity and high dielectric strength, and can improve the insulating property of the coating.
A process for preparing low-temp solidifying epoxy powder paint includes such steps as weighing raw materials, mixing, extruding out particles, tabletting, breaking, pulverizing, sieving and packing. Wherein, the mixing is carried out by adopting a double-cylinder conjoined mixer, and main components are mixed by a main cylinder, wherein the main components comprise epoxy resin, carboxyl end-grade polyester resin and inorganic filler; mixing epoxy resin and carboxyl end group polyester resin for 1-3 min, then pouring inorganic filler and continuously mixing for 1-3 min; mixing additives, namely a low-temperature curing agent, titanium dioxide, a toughening agent, a curing accelerator, a leveling agent antistatic agent and a silane coupling agent, with secondary steel for 1-2 min; pouring the mixed additive into a main cylinder and mixing for 1-5 min; the temperature of the extruded particles is 95-105 ℃.
The invention also provides a double-cylinder conjoined mixer, which is used in the mixing step of the preparation method of the low-temperature curing epoxy powder coating and can simultaneously mix the additive and the main material, thereby improving the productivity on one hand and mixing the raw materials more fully in a layered manner on the other hand. A double-cylinder conjoined mixer comprises a main cylinder, a secondary cylinder and a base; the secondary cylinder is arranged in the main cylinder, and the axis of the secondary cylinder is coincident with the axis of the main cylinder; a spiral stirring shaft is arranged in the secondary cylinder, and spiral stirring blades are arranged on the outer side of the secondary cylinder body; the base comprises a support frame and a base body, wherein the support frame is arranged on the base body, the support frame is arranged on two sides of the main cylinder through a rotating shaft and connected with each other, and the base body is connected with the main cylinder body; the secondary cylinder is connected with the main cylinder through a rotating shaft. And the cylinder cover is arranged on the secondary cylinder body, and after the additives are mixed, the cylinder cover is opened to rotate the secondary cylinder, so that the additives can be introduced into the main cylinder.
The invention has the beneficial effects that:
1. the coating has good insulating property and strength, is low in curing temperature, and can be suitable for spraying base materials which cannot resist high temperature;
2. the production method of the coating is efficient, can be fully automatically controlled, can effectively eliminate the influence of human factors, enables the coating quality of the coating to be more stable and consistent, and integrates the integration of coating preparation and quality control;
3. the double-cylinder conjoined mixer used in the coating production can mix and stir in layers simultaneously, improve the stirring effect and improve the mixing efficiency.
Drawings
FIG. 1 is a schematic view of a twin cylinder mixer.
Detailed Description
Example 1
A low-temperature curing insulating epoxy powder coating comprises the following components in parts by weight: epoxy resin: 30 parts of carboxyl-terminated polyester resin: 28 parts of low-temperature curing agent: 4 parts of titanium dioxide: 4 parts of a toughening agent: 3 parts of curing accelerator: 3 parts of inorganic filler: 25 parts of antistatic agent: 0.2 part of silane coupling agent: 0.2 part. Wherein, the main components are epoxy resin, carboxyl end-grade polyester resin and inorganic filler; the additives are low-temperature curing agent, titanium dioxide, toughening agent, curing accelerator, antistatic agent and silane coupling agent.
A process for preparing low-temp solidifying epoxy powder paint includes such steps as weighing raw materials, mixing, extruding out particles, tabletting, breaking, pulverizing, sieving and packing. Wherein, the mixing is carried out by adopting a double-cylinder conjoined mixer, main components are mixed by a main cylinder, epoxy resin and carboxyl end group polyester resin are mixed for 1min, and then inorganic filler is poured into the mixture to be continuously mixed for 2 min; mixing the secondary steel with the additive for 2min, and pouring the mixed additive into the main cylinder for mixing for 2 min; the temperature of the extruded pellets was 95 ℃.
As shown in fig. 1, a twin cylinder twin mixer used in the mixing step of the above preparation method comprises a main cylinder 1, a secondary cylinder 2, and a base 3; the secondary cylinder is arranged in the main cylinder, and the axis of the secondary cylinder is coincident with the axis of the main cylinder; a spiral stirring shaft 2.1 is arranged in the secondary cylinder, and spiral stirring blades 2.2 are arranged outside the cylinder body of the secondary cylinder; the base comprises a support frame 3.1 and a base body 3.2, wherein the support frame is arranged on the base body, the support frame is arranged on two sides of the main cylinder through a rotating shaft 1.1 and connected with each other, and the base body is connected with a main cylinder body; the secondary cylinder is connected with the main cylinder through a rotating shaft. And the cylinder body of the secondary cylinder is provided with a cylinder cover 2.3, and after the additives are mixed, the cylinder cover is opened to rotate the secondary cylinder, so that the additives can be introduced into the main cylinder.
Example 2
A low-temperature curing insulating epoxy powder coating comprises the following components in parts by weight: epoxy resin: 35 parts of carboxyl end group polyester resin: 35 parts of low-temperature curing agent: 3 parts of titanium dioxide: 5 parts of a toughening agent: 3 parts of curing accelerator: 3 parts of inorganic filler: 20 parts of leveling agent: 2 parts of a silane coupling agent: 1. wherein, the main components are epoxy resin, carboxyl end-grade polyester resin and inorganic filler; the additive is low-temperature curing agent, titanium dioxide, toughening agent, curing accelerator, leveling agent antistatic agent and silane coupling agent.
A process for preparing low-temp solidifying epoxy powder paint includes such steps as weighing raw materials, mixing, extruding out particles, tabletting, breaking, pulverizing, sieving and packing. Wherein, the mixing is carried out by adopting the double-cylinder conjoined mixer in the embodiment 1, main components are mixed by a main cylinder, epoxy resin and carboxyl end group polyester resin are mixed for 2min, and then inorganic filler is poured into the mixture to be continuously mixed for 1 min; mixing the secondary steel with the additive for 1.5min, and pouring the mixed additive into the main cylinder for mixing for 3 min; the temperature of the extruded pellets was 99 ℃.
Example 3
A low-temperature curing insulating epoxy powder coating comprises the following components in parts by weight: epoxy resin: 40 parts of carboxyl-terminated polyester resin: 25 parts of low-temperature curing agent: 8 parts of titanium dioxide: 7 parts of a toughening agent: 5 parts of curing accelerator: 1 part of inorganic filler: 15 parts of leveling agent: 1 part of antistatic agent: 1 part of silane coupling agent: 0.4. wherein, the main components are epoxy resin, carboxyl end-grade polyester resin and inorganic filler; the additive is low-temperature curing agent, titanium dioxide, toughening agent, curing accelerator, leveling agent antistatic agent and silane coupling agent.
A process for preparing low-temp solidifying epoxy powder paint includes such steps as weighing raw materials, mixing, extruding out particles, tabletting, breaking, pulverizing, sieving and packing. Wherein, the mixing is carried out by adopting the double-cylinder conjoined mixer in the embodiment 1, main components are mixed by a main cylinder, epoxy resin and carboxyl end group polyester resin are mixed for 3min, and then inorganic filler is poured into the mixture to be continuously mixed for 2 min; mixing the secondary steel with the additive for 1min, and pouring the mixed additive into the main cylinder for mixing for 5 min; the temperature of the extruded pellets was 105 ℃.
The detection data of the coating prepared by the three methods are as follows:
from the above data, it can be seen that the present invention satisfies the standard requirements, with example 3 having the highest hardness and impact strength, example 2 having the best insulation and leveling properties, and the lowest curing temperature. In conclusion, the coating produced by the ratio of the components in example 2 is the best.
Claims (3)
1. A preparation method of low-temperature curing insulating epoxy powder coating comprises the steps of weighing materials, mixing, extruding particles, tabletting, crushing, sieving and packaging, and is characterized in that,
mixing by adopting a double-cylinder conjoined mixer, and mixing main components by using a main cylinder, wherein the main components comprise epoxy resin, carboxyl end group polyester resin and inorganic filler; mixing epoxy resin and carboxyl end group polyester resin for 1-3 min, then pouring inorganic filler and continuously mixing for 1-3 min; mixing additives with a secondary cylinder for 1-2 min, wherein the additives are a low-temperature curing agent, titanium dioxide, a toughening agent, a curing accelerator, a leveling agent, an antistatic agent and a silane coupling agent; pouring the mixed additive into a main cylinder and mixing for 1-5 min; the temperature of the extruded particles is 95-105 ℃; the double-cylinder conjoined mixer comprises a main cylinder, a secondary cylinder and a base; the secondary cylinder is arranged in the main cylinder, and the axis of the secondary cylinder is coincident with the axis of the main cylinder; a spiral stirring shaft is arranged in the secondary cylinder, and stirring blades are arranged on the outer side of the secondary cylinder body; the base comprises a support frame and a base body, wherein the support frame is arranged on the base body, the support frame is arranged on two sides of the main cylinder through a rotating shaft and connected with each other, and the base body is connected with the main cylinder body; the secondary cylinder is connected with the main cylinder through a rotating shaft; wherein the weighing materials comprise the following components in parts by weight: epoxy resin: 30-40 parts of carboxyl end group polyester resin: 25-35 parts of low-temperature curing agent: 3-8 parts of titanium dioxide: 3-7 parts of a toughening agent: 3-5 parts of a curing accelerator: 1-3 parts of inorganic filler: 15-25 parts of a leveling agent: 0-5 parts of antistatic agent: 0-1 part of a silane coupling agent: 0.2-1 part.
2. The method for preparing low-temperature curing insulating epoxy powder coating as claimed in claim 1, wherein a cylinder cover is provided on the secondary cylinder body.
3. The method for preparing a low temperature curing insulating epoxy powder coating as claimed in claim 1, wherein the outside of the secondary cylinder is a spiral stirring blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710848822.9A CN107513334B (en) | 2017-09-20 | 2017-09-20 | Low-temperature curing insulating epoxy powder coating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710848822.9A CN107513334B (en) | 2017-09-20 | 2017-09-20 | Low-temperature curing insulating epoxy powder coating |
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| CN107513334A CN107513334A (en) | 2017-12-26 |
| CN107513334B true CN107513334B (en) | 2020-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN112759971A (en) * | 2021-02-05 | 2021-05-07 | 苏州大乘环保新材有限公司 | Colored spar paste anti-formaldehyde putty decorative material and construction process thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5498663A (en) * | 1991-05-28 | 1996-03-12 | Nippon Oil And Fats Co., Ltd. | Powder coating materials for producing crepe-like coatings, preparation and use thereof |
| CN104497797A (en) * | 2014-12-31 | 2015-04-08 | 山东朗法博粉末涂装科技有限公司 | Super-levelling low-temperature curing powder coating for MDF |
| CN104513591A (en) * | 2014-12-29 | 2015-04-15 | 浙江明泉工业涂装有限公司 | Medium-and-low temperature cured thinly-coated powder coating for household electrical appliance and preparation method for medium-and-low temperature cured thinly-coated powder coating |
| CN104530922A (en) * | 2014-12-31 | 2015-04-22 | 天津盛达粉末涂料有限公司 | Powder coating capable of eliminating static electricity |
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- 2017-09-20 CN CN201710848822.9A patent/CN107513334B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5498663A (en) * | 1991-05-28 | 1996-03-12 | Nippon Oil And Fats Co., Ltd. | Powder coating materials for producing crepe-like coatings, preparation and use thereof |
| CN104513591A (en) * | 2014-12-29 | 2015-04-15 | 浙江明泉工业涂装有限公司 | Medium-and-low temperature cured thinly-coated powder coating for household electrical appliance and preparation method for medium-and-low temperature cured thinly-coated powder coating |
| CN104497797A (en) * | 2014-12-31 | 2015-04-08 | 山东朗法博粉末涂装科技有限公司 | Super-levelling low-temperature curing powder coating for MDF |
| CN104530922A (en) * | 2014-12-31 | 2015-04-22 | 天津盛达粉末涂料有限公司 | Powder coating capable of eliminating static electricity |
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