CN102898924A - Automobile aluminium wheel hub powdery paint suitable for bonding counterbalances and preparation method thereof - Google Patents
Automobile aluminium wheel hub powdery paint suitable for bonding counterbalances and preparation method thereof Download PDFInfo
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- CN102898924A CN102898924A CN2012103721084A CN201210372108A CN102898924A CN 102898924 A CN102898924 A CN 102898924A CN 2012103721084 A CN2012103721084 A CN 2012103721084A CN 201210372108 A CN201210372108 A CN 201210372108A CN 102898924 A CN102898924 A CN 102898924A
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Abstract
The invention discloses an automobile aluminium wheel hub powdery paint suitable for bonding counterbalances, mainly comprising polyester resin, epoxy resin and surfactant. The paint disclosed herein forms a coating which has good ventilation effect on the automobile aluminium wheel hub with large thermal capacity, excellent performance of bonding counterbalances, and can effectively solve the problem that counterbalances are easily detached. The invention further discloses a preparation method of the powdery paint.
Description
Technical field
The present invention relates to a kind of powder coating, relate in particular to a kind of automobile aluminum wheel hub powder coating that counterbalance weight coheres that is suitable for, the invention still further relates to the preparation method of described powder coating.
Background technology
Powder coating developed rapidly along with a little years, the outside increasing powder coating and their application that uses of aluminium wheel hub.Become the most important standard of measurement automobile appearance except vehicle body because of the outward appearance of wheel hub, so in recent years, some important medium-to-high grade brand automobiles more and more pay attention to improving the outward appearance of automotive hub, the mounting means of counterbalance weight is become adhesive type by the mounting board formula, and all there is the low problem of counterbalance weight cohesiveness in various degree in powder at the bottom of the reaction powder coating supplier's of wheel hub company the wheel hub, and counterbalance weight also has in various degree easily obscission.
At present, mostly base material according to wheel hub is aluminium and alloy cast forging piece thereof, after powder coating is sprayed on these cast members, the casting hub of these coatings has small molecules and overflows in thermofixation, caused the leachy situation of coatingsurface meeting, mostly adopt and in the powder coating prescription, add ethylenebisstearamide (EBS) class material improves the permeability of coating as ventilating agent method, but because this material spills in the process of coating curing in the surface, form a kind of cere at coatingsurface, can change the surface tension of coatingsurface and make coating to the stickup degradation of counterbalance weight.In addition, because the thermal capacity of aluminum wheels of automobiles is large, the temperature transmission is fast not, cause easily powder to can not get fully breathing freely when the workpiece melting solidifying with regard to gel, coatingsurface generation pore and levelling property are poor.
Summary of the invention
One of purpose of the present invention is to provide a kind of automobile aluminum wheel hub powder coating that counterbalance weight coheres that is suitable for, this coating has good air permeable effect in the coating that large thermal capacity automobile aluminum wheel hub forms, and have excellent counterbalance weight and paste performance, can effectively solve the caducous problem of counterbalance weight.
Two of purpose of the present invention provides the preparation method of above-mentioned powder coating.
First purpose of the present invention is achieved through the following technical solutions: a kind ofly be suitable for the automobile aluminum wheel hub powder coating that counterbalance weight coheres, mainly be comprised of vibrin, Resins, epoxy and tensio-active agent.
The present invention adds tensio-active agent on the basis of vibrin and Resins, epoxy, the permeability with the coating that strengthens powder coating improves the stickup performance of powder coating particle, thereby strengthens the cohesiveness of counterbalance weight.Moreover, make powder coating when large thermal capacity automobile aluminum wheel hub application, have good flow leveling behind the interpolation tensio-active agent.
As an embodiment of the invention, describedly be suitable for the automobile aluminum wheel hub powder coating that counterbalance weight coheres and be prepared from by following parts by weight of component:
Tensio-active agent of the present invention is one or more amino modified compounds, and this tensio-active agent is improving the permeability that is coated with film system, but does not change the surface tension of filming.Particularly, comprise a kind of in amino modified phenol carbamide compound, amino modified phenolic compound and the amino modified aldehyde carbamide compound.
Proportion optimization between described vibrin and the Resins, epoxy is 30:70～50:60.
Described vibrin is saturated carboxyl polyester resin, its acid number: 30～60mgKOH/g, and glass transition temperature Tg: 55～75 ℃, softening temperature: 90～120 ℃.
As one embodiment of the present invention, described saturated carboxyl polyester resin is prepared from by the monomer component melt polymerization of following weight part:
Terephthalic acid, m-phthalic acid or both mixtures are adopted in described acidolysis agent.
Described aromatic polycarboxylic acid is terephthalic acid or m-phthalic acid or both mixtures.
Described fatty polyprotonic acid is a kind of in maleic anhydride and the hexanodioic acid or two kinds.
Described branching agent is TriMethylolPropane(TMP).
Described polyvalent alcohol is a kind of or mixture in ethylene glycol, neopentyl glycol and the 1,4 cyclohexane dimethanol.
As an embodiment of the invention, above-mentioned saturated carboxyl polyester resin can get with following method preparation, may further comprise the steps:
1) in reactor, add polyvalent alcohol, branching agent and water, be heated to fusing;
2) add successively aromatic polycarboxylic acid, fatty polyprotonic acid and Dibutyltin oxide, pass into nitrogen and continue to be warming up to 130 ℃;
3) temperature is heated to 250 ℃ by 130 ℃, reach 14～16mgKOH/g to acid number, vacuumize for the first time and carry out polycondensation, when acid number reaches 4～6mgKOH/g, 100～105 ℃ of softening temperatures and 200 ℃ of melt viscosity 3000～3500mpa.s, add the acidolysis agent and carry out acidolysis reaction, when acid number reaches 40～45mgKOH/g, vacuumize for the second time and proceed acidolysis reaction, acid number to reaction product is 30～60mgKOH/g, hydroxyl value stopped reaction during less than 15mgKOH/g obtains saturated carboxyl polyester resin.The acid number of this saturated carboxyl polyester resin is at 30 ~ 60mgKOH/g, and softening temperature is 90～120 ℃, and second-order transition temperature is at 60～70 ℃.
Described Resins, epoxy is pressed powder Resins, epoxy, and its epoxy equivalent (weight) is 600～900g/ep, and melt viscosity is 150 ℃ of 600～900 cps@, and softening temperature (G, max.) is 70～100 ℃.
Described dulling and curing agent is one or both the mixture in ring amidine and the polynary hydrochlorate dulling and curing agent.As one embodiment of the present of invention, the weight proportion between described vibrin, Resins, epoxy and the dulling and curing agent is preferably 30: 70: 8～and 50: 60: 1.
Described auxiliary agent adopts conventional auxiliary agent to get final product, and for example adopts one or more the mixture in flow agent, st-yrax, ventilating agent, optical brightener, growth agent and the promotor.
Described filler is one or more the mixture in titanium dioxide, calcium carbonate, barium sulfate, mica powder, silicon powder and the superfine aluminium power.
Described pigment adopts the weather resistant mineral dye, one or more during, ultramarine blue or green such as: iron oxide black, carbon black, chrome yellow, iron oxide red, titanium indigo plant, titanium and titanium are green etc.
Second goal of the invention of the present invention is achieved through the following technical solutions: a kind of preparation method who is suitable for the automobile aluminum wheel hub powder coating that counterbalance weight coheres may further comprise the steps:
(1) in reactor, add polyvalent alcohol, branching agent and water, be heated to fusing;
(2) add successively aromatic polycarboxylic acid, fatty polyprotonic acid and Dibutyltin oxide, pass into nitrogen and continue to be warming up to 130 ℃;
(3) temperature is heated to 250 ℃ by 130 ℃, reach 14～16mgKOH/g to acid number, vacuumize for the first time and carry out polycondensation, when acid number reaches 4～6mgKOH/g, 100～105 ℃ of softening temperatures and 200 ℃ of melt viscosity 3000～3500mpa.s, add the acidolysis agent and carry out acidolysis reaction, when acid number reaches 40～45mgKOH/g, vacuumize for the second time and proceed acidolysis reaction, acid number to reaction product is 30～60mgKOH/g, hydroxyl value stopped reaction during less than 15mgKOH/g obtains saturated carboxyl polyester resin;
(4) take by weighing in proportion saturated carboxyl polyester resin, Resins, epoxy and polynary hydrochlorate, ring amidine dulling and curing agent composition, auxiliary agent, tensio-active agent, filler and pigment place compounding jar, fully mix and fragmentation, obtain mixing the premix material;
(5) mixing premix material is sent in the twin screw extruder and is extruded;
(6) material after extruding is packed after tabletting machine compressing tablet, cooling, pulverizing, screening and is got final product.
Select JFY-30 type track type twin screw extruder in the described step (5), extrusion temperature one district is 80～100 ℃, and preferred 85～95 ℃, two districts are 80～120 ℃, preferred 95～115 ℃.
Extrudate in the described step (6) through pulverizer pulverize and screening after diameter of particle be 1～200 μ m, preferred 1～180 μ m, more preferably 1～170 μ m, diameter of particle refers to the equivalent grain size D of powder
50
The coating process of the automobile aluminum wheel hub special bottom powder coating that the present invention adopts is: use high-pressure electrostatic spray gun, be coated on the surperficial treated automobile aluminum wheel hub ground material, thickness is generally 60～120 μ m, preferred 100 ~ 120 μ m, 180 ℃ of solidification values, be 10～25 minutes set time, adopts curing oven to be cured, and obtains powder powder coating at the bottom of the finished product automobile aluminum wheel hub.According to the present invention, the metal that powder coating applies is the cast member of aluminium and alloy thereof.And preferably the process of cleaning is pretreated, for example carries out pre-treatment with zinc phosphate or tertiary iron phosphate.Base material is aluminium wheel or automotive interior decoration part.
The present invention compared with prior art has the following advantages:
(1) the present invention is on the basis of vibrin and Resins, epoxy, added tensio-active agent, strengthened the sticking note performance of powder coating particle, can form at the forged hub spare of aluminium and alloy thereof the high powder coating of pasting performance, can make counterbalance weight stick on securely wheel hub, difficult drop-off.
(2) tensio-active agent has also improved the permeability that powder coating is coated with film system, but does not change the surface tension of filming, and has improved the levelling property of powder coating, makes the coating have highly air-permeable and smooth appearance of coat.
Embodiment
Unless otherwise indicated, all technique and all embodiment carry out gentle the depressing of standard temperature.
The listed scope of this paper all comprises end value and can mutually make up.
In this article, term " powder coating " expression powder paint compositions, the coating that term " powder coating " expression is formed by powder paint compositions.
The below enumerates some specific exampless, and the present invention will be described, is necessary to be pointed out that at this following specific embodiment only for the invention will be further described, does not represent limiting the scope of the invention.Some nonessential adjustment that other people make according to the present invention and modification still belong to protection scope of the present invention.
Embodiment 1
It is the saturated carboxyl polyester resin of 30～35mgKOH/g that present embodiment adopts resin to adopt acid number, and its preparation method is as follows:
1) in reactor, add 13Kg neopentyl glycol, 0.5kg TriMethylolPropane(TMP), 1kg 1,4 cyclohexane dimethanol and 3kg water, be heated to fusing;
2) add successively 27kg terephthalic acid, 10.5kg m-phthalic acid, 0.6kg hexanodioic acid and 0.1kg Dibutyltin oxide, pass into nitrogen and continue to be warming up to 130 ℃;
3) temperature is heated to 250 ℃ by 130 ℃, reach 13mgKOH/g to acid number, vacuumize for the first time and carry out polycondensation, when acid number reaches 4mgKOH/g, 100 ℃ of softening temperatures and 200 ℃ of melt viscosity 3000mpa.s, add acidolysis agent m-phthalic acid 0.05kg, carry out acidolysis reaction, when acid number reaches 40mgKOH/g, vacuumize for the second time and carry out acidolysis reaction, to the acid number of reaction product be 30～35mgKOH/g, hydroxyl value stopped reaction during less than 15mgKOH/g obtains saturated carboxyl polyester resin.The acid number of this saturated carboxyl polyester resin is at 30～35mgKOH/g, and softening temperature is 101 ℃, and second-order transition temperature is at 62 ℃.
Be suitable for the automobile aluminum wheel hub powder coating that counterbalance weight coheres, its component and weight part proportioning are:
The preparation method:
(1) taking by weighing in proportion saturated carboxyl polyester resin, the epoxy equivalent (weight) that acid number is 30～35KOH/kg is that 600～750g/ep Resins, epoxy, ring amidine and polyprotonic acid dulling and curing agent, titanium dioxide, barium sulfate, flow agent, st-yrax, amino modified phenol carbamide compound and pigment place compounding jar, fully mixes and broken 1～10 minute;
(2) material after the pre-mixing enters twin screw extruder and extrudes; The forcing machine heating and temperature control is at 80～120 ℃;
(3) to be ground into particle diameter (equivalent grain size D50) through compressing tablet, cooling, pulverizer be the powder of 30～45 μ m to the material after extruding, then packing after the screening.
Film performance after the product painting that is obtained by above-described embodiment solidifies is as follows:
| Test item | Inspecting standard or method | Test rating |
| Outward appearance | / | Smooth smooth, pore-free |
| Gloss | / | 35-50Gu |
| Shock strength | GB/T?1732-1993 | Pass through 50Kg.cm |
| Snappiness | GB/T?1731-1993 | ≤2mm |
| Pencil hardness | GB/T?6739-2006 | ≥1H |
| Sticking power (cross-hatching) | GB/T?9286-1998 | 0 grade |
| The counterbalance weight adherence force | Popular TL-239 standard | 50N/mm 2 |
Embodiment 2
The vibrin of present embodiment adopts the saturated carboxyl polyester resin of 30～35KOH/kg of embodiment 1.
Be suitable for the automobile aluminum wheel hub powder coating that counterbalance weight coheres, its component and weight part proportioning are:
The preparation method:
(1) taking by weighing in proportion saturated carboxyl polyester resin, the epoxy equivalent (weight) that acid number is 30～35KOH/kg is that 600～750g/ep Resins, epoxy, ring amidine and polyprotonic acid dulling and curing agent, titanium dioxide, barium sulfate, flow agent, st-yrax, amino modified phenol carbamide compound and pigment place compounding jar, fully mixes and broken 1～10 minute;
(2) material after the pre-mixing enters twin screw extruder and extrudes; The forcing machine heating and temperature control is at 80～120 ℃;
(3) to be ground into particle diameter (equivalent grain size D50) through compressing tablet, cooling, pulverizer be the powder of 30～45 μ m to the material after extruding, then packing after the screening.
Film performance after the product painting that is obtained by above-described embodiment solidifies is as follows:
| Test item | Inspecting standard or method | Test rating |
| Outward appearance | / | Smooth smooth, pore-free |
| Gloss | / | 35-50Gu |
| Shock strength | GB/T?1732-1993 | Pass through 50Kg.cm |
| Snappiness | GB/T?1731-1993 | ≤2mm |
| Pencil hardness | GB/T?6739-2006 | ≥1H |
| Sticking power (cross-hatching) | GB/T?9286-1998 | 0 grade |
| The counterbalance weight adherence force | Popular TL-239 standard | 50N/mm 2 |
Embodiment 3
It is the saturated carboxyl polyester resin of 30～60mgKOH/g that present embodiment adopts resin to adopt acid number, and its preparation method is as follows:
1) in reactor, add 14kg neopentyl glycol, 1.0kg TriMethylolPropane(TMP), 2.0kg1,4-cyclohexanedimethanol and 4.0 water are heated to fusing;
2) add successively 30kg terephthalic acid, 12kg m-phthalic acid, 1.0kg hexanodioic acid and 0.5kg Dibutyltin oxide, pass into nitrogen and continue to be warming up to 130 ℃;
3) temperature is heated to 250 ℃ by 130 ℃, reach 15mgKOH/g to acid number, vacuumize for the first time and carry out polycondensation, when acid number reaches 5mgKOH/g, 103 ℃ of softening temperatures and 200 ℃ of melt viscosity 3200mpa.s, add acidolysis agent m-phthalic acid 0.5kg and carry out acidolysis reaction, when acid number reaches 42mgKOH/g, vacuumize for the second time acidolysis reaction, acid number to reaction product is 30～60mgKOH/g, and hydroxyl value stopped reaction during less than 15mgKOH/g obtains saturated carboxyl polyester resin.The acid number of this saturated carboxyl polyester resin is at 30～60mgKOH/g, and softening temperature is 110 ℃, and second-order transition temperature is at 65 ℃.
Be suitable for the automobile aluminum wheel hub powder coating that counterbalance weight coheres, its component and weight part proportioning are:
The preparation method:
(a) taking by weighing in proportion saturated carboxyl polyester resin, the epoxy equivalent (weight) that acid number is 30～60KOH/kg is that 600～750g/ep Resins, epoxy, titanium dioxide, barium sulfate, esters of acrylic acid flow agent PLP-100, st-yrax and pigment place compounding jar, fully mixes and broken 1～10 minute;
(b) material after the fragmentation enters twin screw extruder and extrudes; The forcing machine heating and temperature control is at 80～120 ℃;
(c) to be ground into particle diameter (equivalent grain size D50) through compressing tablet, cooling, pulverizer be the powder of 30～45 um to the material after extruding, then packing and get final product after the screening.
Film performance after the product painting that is obtained by above-described embodiment solidifies is as follows:
| Test item | Inspecting standard or method | Test rating |
| Outward appearance | / | Smooth smooth, pore-free |
| Gloss | / | ＞80Gu |
| Shock strength | GB/T?1732-1993 | Pass through 50Kg.cm |
| Snappiness | GB/T?1731-1993 | ≤2mm |
| Pencil hardness | GB/T?6739-2006 | ≥1H |
| Sticking power (cross-hatching) | GB/T?9286-1998 | 0 grade |
| The counterbalance weight adherence force | Popular TL-239 standard | 50N/mm 2 |
Embodiment 4
The vibrin of present embodiment adopts the saturated carboxyl polyester resin of 30～60KOH/kg of embodiment 3.
Be suitable for the automobile aluminum wheel hub powder coating that counterbalance weight coheres, its component and weight part proportioning are:
The preparation method:
(a) taking by weighing in proportion saturated carboxyl polyester resin, the epoxy equivalent (weight) that acid number is 30～60KOH/kg is that 600～750g/ep Resins, epoxy, titanium dioxide, barium sulfate, esters of acrylic acid flow agent PLP-100, st-yrax and pigment place compounding jar, fully mixes and broken 1～10 minute;
(b) material after the fragmentation enters twin screw extruder and extrudes; The forcing machine heating and temperature control is at 80～120 ℃;
(c) to be ground into particle diameter (equivalent grain size D50) through compressing tablet, cooling, pulverizer be the powder of 30～45 um to the material after extruding, then packing and get final product after the screening.
Film performance after the product painting that is obtained by above-described embodiment solidifies is as follows:
| Test item | Inspecting standard or method | Test rating |
| Outward appearance | / | Smooth smooth, pore-free |
| Gloss | / | ＞80Gu |
| Shock strength | GB/T?1732-1993 | Pass through 50Kg.cm |
| Snappiness | GB/T?1731-1993 | ≤2mm |
| Pencil hardness | GB/T?6739-2006 | ≥1H |
| Sticking power (cross-hatching) | GB/T?9286-1998 | 0 grade |
| The counterbalance weight adherence force | Popular TL-239 standard | 50N/mm 2 |
Embodiment 5
It is the saturated carboxyl polyester resin of 40～60mgKOH/g that the resin of present embodiment adopts acid number, and its preparation method is as follows:
1) in reactor, add 20Kg neopentyl glycol, 1.5kg TriMethylolPropane(TMP), 2kg 1,4 cyclohexane dimethanol and 5kg water, be heated to fusing;
2) add successively 30kg terephthalic acid, 5kg m-phthalic acid, 1.9kg hexanodioic acid and 0.5kg Dibutyltin oxide, pass into nitrogen and continue to be warming up to 130 ℃;
3) temperature is heated to 250 ℃ by 130 ℃, reach 13mgKOH/g to acid number, vacuumize for the first time and carry out polycondensation, when acid number reaches 4mgKOH/g, 100 ℃ of softening temperatures and 200 ℃ of melt viscosity 3000mpa.s, add acidolysis agent m-phthalic acid 0.05kg, carry out acidolysis reaction, when acid number reaches 40mgKOH/g, vacuumize for the second time and carry out acidolysis reaction, to the acid number of reaction product be 40～60mgKOH/g, hydroxyl value stopped reaction during less than 15mgKOH/g obtains saturated carboxyl polyester resin.The acid number of this saturated carboxyl polyester resin is at 40～60mgKOH/g, and softening temperature is 115 ℃, and second-order transition temperature is at 70 ℃.
Be suitable for the automobile aluminum wheel hub powder coating that counterbalance weight coheres, its component and weight part proportioning are:
The preparation method:
(1) taking by weighing in proportion saturated carboxyl polyester resin, the epoxy equivalent (weight) that acid number is 40～60KOH/kg is that 600～750g/ep Resins, epoxy, ring amidine and polyprotonic acid dulling and curing agent, titanium dioxide, barium sulfate, flow agent, st-yrax, amino modified phenol carbamide compound and pigment place compounding jar, fully mixes and broken 1～10 minute;
(2) material after the pre-mixing enters twin screw extruder and extrudes; The forcing machine heating and temperature control is at 80～120 ℃;
(3) to be ground into particle diameter (equivalent grain size D50) through compressing tablet, cooling, pulverizer be the powder of 30～45 μ m to the material after extruding, then packing after the screening.
Film performance after the product painting that is obtained by above-described embodiment solidifies is as follows:
| Test item | Inspecting standard or method | Test rating |
| Outward appearance | / | Smooth smooth, pore-free |
| Gloss | / | 35-50Gu |
| Shock strength | GB/T?1732-1993 | Pass through 50Kg.cm |
| Snappiness | GB/T?1731-1993 | ≤2mm |
| Pencil hardness | GB/T?6739-2006 | ≥1H |
| Sticking power (cross-hatching) | GB/T?9286-1998 | 0 grade |
| The counterbalance weight adherence force | Popular TL-239 standard | 50N/mm 2 |
In above-described embodiment 1 to 5, the acidolysis agent also can be adopted terephthalic acid.Filler can also adopt one or more the mixture in calcium carbonate, silicon powder, mica powder and the superfine aluminium power.The mixture of one or more during pigment can also chrome yellow, titanium green grass or young crops, iron oxide red, iron oxide black, titanium indigo plant, carbon black ultramarine and titanium are green etc.
Claims (8)
1. one kind is suitable for the automobile aluminum wheel hub powder coating that counterbalance weight coheres, and it is characterized in that, mainly is comprised of vibrin, Resins, epoxy and tensio-active agent.
2. according to claim 1ly be suitable for the automobile aluminum wheel hub powder coating that counterbalance weight coheres, it is characterized in that, be prepared from by following parts by weight of component:
3. according to claim 2ly be suitable for the automobile aluminum wheel hub powder coating that counterbalance weight coheres, it is characterized in that, described tensio-active agent is a kind of in amino modified phenol carbamide compound, amino modified phenolic compound and the amino modified aldehyde carbamide compound.
4. according to claim 2ly be suitable for the automobile aluminum wheel hub powder coating that counterbalance weight coheres, it is characterized in that the proportioning between described vibrin and the Resins, epoxy is 30:70～50:60.
5. according to claim 2ly be suitable for the automobile aluminum wheel hub powder coating that counterbalance weight coheres, it is characterized in that, when containing dulling and curing agent in the described powder coating, the weight proportion between described vibrin, Resins, epoxy and the dulling and curing agent is preferably 30: 70: 8～and 50: 60: 1.
6. according to claim 2ly be suitable for the automobile aluminum wheel hub powder coating that counterbalance weight coheres, it is characterized in that, described vibrin is saturated carboxyl polyester resin, its acid number 30～60 mgKOH/g, 55～75 ℃ of glass transition temperature Tg, 90～120 ℃ of softening temperatures, its monomer component melt polymerization by following weight part is prepared from:
7. according to claim 2ly be suitable for the automobile aluminum wheel hub powder coating that counterbalance weight coheres, it is characterized in that, described dulling and curing agent is one or both the mixture in ring amidine and the polynary hydrochlorate dulling and curing agent; Described auxiliary agent is one or more the mixture in flow agent, st-yrax, ventilating agent, optical brightener, growth agent and the promotor; Described filler is one or more the mixture in titanium dioxide, calcium carbonate, barium sulfate, mica powder, silicon powder and the superfine aluminium power.
8. each described preparation method who is suitable for the automobile aluminum wheel hub powder coating that counterbalance weight coheres according to claim 2-7 is characterized in that, may further comprise the steps:
(1) in reactor, add polyvalent alcohol, branching agent and water, be heated to fusing;
(2) add successively aromatic polycarboxylic acid, fatty polyprotonic acid and Dibutyltin oxide, pass into nitrogen and continue to be warming up to 130 ℃;
(3) temperature is heated to 250 ℃ by 130 ℃, reach 14～16mgKOH/g to acid number, vacuumize for the first time and carry out polycondensation, when acid number reaches 4～6mgKOH/g, 100～105 ℃ of softening temperatures and 200 ℃ of melt viscosity 3000～3500mpa.s, add the acidolysis agent and carry out acidolysis reaction, when acid number reaches 40～45mgKOH/g, vacuumize for the second time and proceed acidolysis reaction, acid number to reaction product is 30～60mgKOH/g, hydroxyl value stopped reaction during less than 15mgKOH/g obtains saturated carboxyl polyester resin;
(4) take by weighing in proportion saturated carboxyl polyester resin, Resins, epoxy and polynary hydrochlorate, ring amidine dulling and curing agent composition, auxiliary agent, tensio-active agent, filler and pigment place compounding jar, fully mix and fragmentation, obtain mixing the premix material;
(5) mixing premix material is sent in the twin screw extruder and is extruded;
(6) material after extruding is packed after tabletting machine compressing tablet, cooling, pulverizing, screening and is got final product.
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| CN107129751A (en) * | 2017-05-05 | 2017-09-05 | 霍文波 | A kind of thermosetting fluorocarbon powder coatings and preparation method thereof |
| CN107177300A (en) * | 2017-05-05 | 2017-09-19 | 霍文波 | A kind of stain resistant thermosetting powder coating and preparation method thereof |
| CN109535922A (en) * | 2018-10-16 | 2019-03-29 | 广州擎天材料科技有限公司 | A kind of high levelling low brightness paint powder of automobile parts low-temperature setting and preparation method thereof |
| CN109535922B (en) * | 2018-10-16 | 2021-05-04 | 擎天材料科技有限公司 | Low-temperature curing high-leveling low-gloss powder coating for automobile parts and preparation method thereof |
| CN109590198A (en) * | 2018-12-19 | 2019-04-09 | 昆山金百辰金属科技有限公司 | For the technique in automobile wheel hub surface plating aluminum or aluminum alloy |
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| CN111892860A (en) * | 2020-08-05 | 2020-11-06 | 陕西蓝晟新材料研发有限公司 | Energy-storage luminous powder coating and production construction method |
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