CN104194583A - Weather-resistant type powder paint capable of substituting aluminum profile chromating process and preparation method of weather-resistant type powder paint - Google Patents
Weather-resistant type powder paint capable of substituting aluminum profile chromating process and preparation method of weather-resistant type powder paint Download PDFInfo
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- CN104194583A CN104194583A CN201410428587.6A CN201410428587A CN104194583A CN 104194583 A CN104194583 A CN 104194583A CN 201410428587 A CN201410428587 A CN 201410428587A CN 104194583 A CN104194583 A CN 104194583A
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Abstract
The invention relates to the powder paint and particularly relates to weather-resistant type powder paint capable of substituting an aluminum profile chromating process and a preparation method of the weather-resistant type powder paint. The weather-resistant type powder paint capable of substituting the aluminum profile chromating process comprises polyether resin, a curing agent, a flatting agent, benzoin, a degassing agent, wax powder, filler, pigment and acrylic elastomer. The weather-resistant type powder paint is characterized in that a nano material is added into the polyether resin to modify, wherein the nano material is a combination of nano aluminum oxide, nano zirconium oxide, nano zinc oxide and nano silicon oxide. The powder paint disclosed by the invention can be used for improving adhesive force of a film to achieve the preservative effect, and also can be used for improving the weather resistance of the powder paint, remarkably improving the performances of the powder paint and increasing a new function. The powder paint disclosed by the invention has relatively high coating hardness, pencil hardness capable of reaching 3H, and relatively good abrasive resistance and toughness of the coating.
Description
Technical field
The present invention relates to powder coating, be specifically related to a kind of Weather-resisting powder coating that replaces aluminum section bar chromizing treatment process and preparation method thereof.
Background technology
Chromatedsolution and metal function, in the process of its Surface Creation trivalent or sexavalence chromizing layer, are called chromaking passivation.Be used for the processing of aluminium, magnesium and alloy thereof, to iron and steel, also can form chromizing layer, but use seldom separately, normal and phosphatization supports the use, and to seal the hole of phosphate coating, makes iron and steel passivation exposed in phosphate coating, to suppress the corrosive nature of remaining phosphatization accelerator, further increase protective capacities.Aluminium alloy extrusions chromaking Passivation Treatment is last processing step of matting in its Pretreatment Technology Before Finishing, is also most critical one step, its objective is in order to increase the sticking power of coating after material antiseptic erosion property and application.But if do not wash clean the surface that can remain in aluminium section bar just sexavalent chrome is main passivating solution punching, hexavalent chromium toxicity is very big, can cause great harm to human body and physical environment.Although trivalent chromium also can substitute sexavalent chrome, for passivating solution, it is chromic 1% that the toxicity of trivalent chromium solutions only has, but the corrosion resistance nature of its chromizing layer be also far not by far up to the mark, and finally exist equally the problem that chromate waste water is processed.
In order fundamentally to solve the pollution problem of chromium ion, exist now two kinds to solve thinking.Be to select the free of contamination pretreatment liquid of other nontoxicitys to replace a pretreatment liquid for chromic salt, by adopting different process method, reach the protective membrane with the same anticorrosion ability of chromaking.
As Chinese patent CN200610103829.X, a kind of no-chromium chemical converting agent is disclosed.This transforming agent is composited by the oxygenant of potassium permanganate or hydrogen peroxide and the activator of the membrane-forming agent of phosphoric acid and ammonium bifluoride and the promotor of zirconium chloride.This no-chromium chemical converting agent is not containing chromium ion, nontoxic, and the solidity to corrosion of rete is good, strong adhesion, can be used for the protection of aluminium and decorates and process.
Chinese patent CN201310212259.8, the invention discloses the corrosion proof cobalt-based Chrome-free of a kind of raising aluminium alloy chemical conversion processing method.First the present invention carries out respectively the pre-treatment of oil removing, etch, activation to aluminium alloy, then adopts cobalt salt chemical conversion solution to carry out chemical treatment to it.It is low that present method has cost, pollution-free; The features such as film layer structure is fine and close, and erosion resistance is strong.
Chinese patent CN201010139798.X, discloses a kind of refrigerator, ice chest evaporator chromium-free passivation method of aluminum pipe and passivating solution thereof.Its passivating solution is added the solvent composition of water by I vinyl three ('beta '-methoxy oxyethyl group) silane and II 1-isobutyl-3,5-dimethylhexylphosphoric acid passivator, benzotriazole or water glass auxiliary agent and ethanol, after passivation, aluminum pipe corrosion resistance nature improves, medicament and passivating process safety and environmental protection, with low cost, speed is fast.
Although above-mentioned these patents can make aluminium shape surface reach the anticorrosion ability same with chromaking, the feature such as environmentally safe, cost are lower, but these methods all need aluminium section bar to carry out liquid-soaked pre-treatment, can not simplify the pre-treating technology that saves passive film.
Solve another thinking that chromium ion pollutes and be the powder coating of aluminium shape surface application is carried out function modified, thereby replace aluminum section bar chromizing pre-treating technology.
Chinese patent CN201310363517.2, discloses a kind of powder coating that can replace aluminium alloy chromate treating and preparation method thereof.This powder coating has added tensio-active agent on the basis of conventional formulation, and phosphoric acid salt or nitrate, to reach the object that replaces chromate treating.But due to adding of phosphoric acid salt in formulation for coating material or nitrate, can have a strong impact on the appearance of filming, be difficult to the good powder coating of the high photosensitiveness levelling of preparation, so this patent have some limitations.
Chinese patent CN200510089870.1, discloses a kind of without chromaking phosphatization electrostatic spraying nanometer powder coating and preparation method.This patent is in resin particle, to add inorganic nano-particle, carries out melting, extrudes, film-making, fragmentation.Then it is prepared to powder coating by general formulation for coating material.Chinese patent CN03138136.7, discloses a kind of nano material of utilizing and traditional powder coating product has been carried out to the method for modification.The method be by nano TiO 2 and the pre-mixing of SiO2 powder body material in powder coating starting material, then melt extruded, compressing tablet powder process obtains modified powder coating products.
Above-mentioned two patents all take full advantage of the surface effects of nano material, small-size effect, and the properties such as macro quanta tunnel effect and Dielectric confinement effect are carried out modification to powder coating, and improve or increase the new function of powder coating.
There is two technical problems, the one, the dispersion insufficiency problem of nanoparticle in powder coating in above patent.Because having adopted the method simply melt extruding, it carries out the dispersion of nanoparticle, the nano particle that causes major part to reunite or reunited in advance can not be dispersed in powder coating fully, not only lost as the due effect of nano material, powder coating surface effect and use properties have been affected on the contrary, particularly, for the high light product of plane, be difficult to reach good levelling; The 2nd, add powder coating occurs after nano material the deterioration of impact resistance of filming, film coated surface weak effect, affected modified powder coating practical effect and batch stability.
Summary of the invention
The object of this invention is to provide a kind of Weather-resisting powder coating that replaces aluminum section bar chromizing treatment process, this powder coating is by nano-material modified vibrin, not only keep levelling property that powder coating is good, promoted the over-all properties of powder coating solidification rear surface coating, and the problem of environmental pollution of solution chromium ion heavy metal, reduced cost.
The Weather-resisting powder coating of replacement aluminum section bar chromizing treatment process of the present invention, comprise vibrin, solidifying agent, flow agent, st-yrax, air release agent, wax powder, filler, pigment, acrylic elastomer, be characterized in adding nano material and carry out modification in vibrin, described nano material is the combination of nano aluminium oxide, nano zircite, nano zine oxide and nano silicon oxide.
Wherein:
Described nano material particle diameter is between 10-100nm, and nano material consumption accounts for the 0.3-4% of powder coating total mass.
The mass ratio of described nano aluminium oxide, nano zircite, nano zine oxide and nano silicon oxide is 2-6:2-6:1:1.
Described vibrin is the saturated terminal carboxyl polyester resin of weather resistant.
Described solidifying agent is hydroxyalkyl amide or isocyanuric acid three-glycidyl ester.
Described modification is first nano material to be scattered in the vibrin of 130-160 ℃ of melting, and then under 1400-2200 rev/min, disperses 20-40 minute through stirring dispersion machine, finally molten polyester is cooling, compressing tablet, fragmentation again.
Described powder coating is preferably made by the raw material with mass percent:
The preparation method of described powder coating, comprises the following steps:
(1) first nano material is scattered in the vibrin of 130-160 ℃ of melting, and then under 1400-2200 rev/min, disperses 20-40 minute through stirring dispersion machine, finally molten polyester is cooling, compressing tablet, fragmentation obtain modified polyester resin again;
(2) again modified polyester resin, solidifying agent, flow agent, st-yrax, air release agent, wax powder, filler, pigment, acrylic elastomer are mixed, through melting extrude, cooling compressing tablet, pulverizing, screening make.
The invention provides a kind of Weather-resisting powder coating that replaces aluminum section bar chromizing treatment process and preparation method thereof.This powder coating is used advanced reasonably nano material dispersing technology, by finely dispersed multiple composite nano material and interpolation, improve the acrylic elastomer of this performance powder coating, the vibrin that use weather resistance is good and solidifying agent, color stuffing, prepare the Weather-resisting powder coating that can replace aluminum section bar chromizing treatment process.This powder coating is except replacing aluminium section bar passivation process completely, also give the physicochemical property that coating itself is more excellent, and keep the levelling property that powder coating is good, improve the actual use properties of powder coating, therefore not only can solve the problem of environmental pollution of the heavy metals such as chromium ion, save technique and reduce the cost, and having promoted the over-all properties of its curing rear surface coating, the surface powder application of aluminium section bar is had very important significance.
Technical scheme of the present invention is comprised of following three part and parcels:
1, the dispersing technology of nano material
Nano material dispersing technology of the present invention is for to be scattered in the nano material of the specific compound proportion of certain particle size range in the pure polyester resin of 130-160 ℃ of melting, then through high-speed stirring dispersion machine high speed dispersion 20-40 minute under 1400-2200 rev/min of working parameter, nano material is fully disperseed in molten polyester, the molten polyester of this modification is cooling, compressing tablet, broken nano-material modified vibrin master batch.
2, composite nano material and film performance improve the selection of auxiliary agent
Nano material of the present invention is nano aluminium oxide, nano zircite, nano zine oxide and nano silicon oxide complex material.When preparation modification replaces aluminum section bar chromizing treatment process powder coating, according to the different requirements to film performance, the ratio of four kinds of nano materials in complex material will be adjusted.
Acrylic elastomer of the present invention is to adjust its adding proportion according to the kind of composite nano material in powder coating and consumption, and it can increase the snappiness of powder coating and the sticking power between powder coating and base material.
3, replace the preparation of the Weather-resisting powder coating of aluminum section bar chromizing treatment process
The formulating of recipe of the Weather-resisting powder coating of replacement aluminum section bar chromizing treatment process of the present invention is that nano-material modified vibrin master batch, solidifying agent, color stuffing and film performance improve auxiliary agent composition.Wherein the ratio of each component requires to adjust accordingly according to the difference to film performance.According to this formulating of recipe preparation powder coating raw material, through mixing, the melting of powder coating Preparation equipment, extrude, cooling compressing tablet, pulverizing, sieve and to obtain modification and replace aluminum section bar chromizing treatment process powder coating.
Principle of the present invention is as follows:
1, nano material dispersion principle
Nano material, because particle diameter is little, specific surface area is large, easily produces pre-reunion, if fail it to disperse fully in nano material is used, pre-nano material of reuniting can lose it as the nano material due effect of institute and result of use.In the present invention, adopt the molten resin that viscosity is lower to disperse nano material, and the shear action through high-speed stirring dispersion machine, nano material can be disperseed to be coated in resin more uniformly, thereby prepare nano-material modified vibrin master batch.
2, the mechanism of action of composite nano material in powder coating
The yardstick of nano material is between 1～100nm, and its modified Nano adding has surface effects mutually, small-size effect, and macro quanta tunnel effect, Dielectric confinement effect, is significantly improved coating property or has increased new function.Nano material is distributed in polymer coating film, because nanoparticle is large to the specific surface of fluoropolymer resin, bonding force is strong, larger length-to-diameter ratio particularly, coating is played to enhancing, toughening effect, can significantly improve the physical and mechanical properties of coating, nano coating can produce powerful and lasting interface interaction power with coatingsurface, improves cohesive strength.The filling of inorganic nano-particle, this interspersed nanostructure has been entered in the defect of high molecular polymer, effectively hindered the diffusion of oxygen to matrix, make the stress concentration of matrix that change occur, matrix resin crack propagation is obstructed and passivation, the final crack that suppresses, be unlikely to develop into destructive crack, and along with reducing of nano particle diameter, the specific surface area of particle increases, filler and substrate contact area increase, and produce more tiny crack when material is hit, and absorb more striking energys.In addition the coating macromolecular chain in matrix that is subject to filming after ultraviolet irradiation easily produces the phenomenons such as fracture, efflorescence.Nanometers etc. have good ageing resistance, can improve significantly the ageing-resistant performance of coating.Nano material particle diameter reduces, and specific surface energy is large, the serious mismatch of key state, thus occurring that many active centre cause the mechanism of nanoparticle chemical property, its wear resistance and compactness all improve a lot, and peeling resistance does not decline.
In addition, because zirconium white, zinc oxide, silicon oxide and aluminum oxide are except all having the characteristic of nano material itself, also there is the Some features of self.Nano zircite good dispersity, has good thermo-chemical stability and higher intensity and toughness; Nano zine oxide has UV-light bridging effect and anti-microbial effect, and is reasonable chemical catalyst, can promote powder coating solidification speed of response; Nano silicon, nano aluminium oxide can be used as thickening material and the thixotropic agent of powder coating and saturated resin, and the effects such as anti-caking, sag prevention and extinction are provided.In the formulating of recipe of modification replacement aluminum section bar chromizing treatment process powder coating, according to the different requirements to film performance, adjust the ratio of four kinds of nano materials in complex material, thereby reach the powder coating of other different use propertieies.
Beneficial effect of the present invention is as follows:
1, modification of the present invention replaces the antiseptic property that aluminum section bar chromizing treatment process powder coating has improved powder coating, improved the sticking power of filming, in the process of surface treatment of aluminium section bar, save chromaking passivation technology, both simplified production technique, avoid again the pollution of chromium metal to environment.
2, in the present invention, adopted advanced rational nano material dispersing technology, make used composite nano material can give full play to its due effect of institute and result of use, not only reached preservative effect, improved the weathering resistance of powder coating simultaneously, and performance powder coating has been significantly improved and has increased new function.
3, powder coating of the present invention has higher coating hardness, and its pencil hardness can reach 3H, and the wear resistance of coating and toughness better.
4, powder coating of the present invention has shielding ultraviolet rays, aging-resistant function, has greatly improved its weather resistance.
5, in powder coating electrostatic spraying construction of the present invention, charging property is better, has improved the powder utilization of powder coating, has saved cost, and has improved working efficiency.
6, powder coating of the present invention has the specific function of antibacterial and photocatalytic self-cleaning, has given this powder coating more functional.
Embodiment
Below in conjunction with embodiment, the present invention is described further.
Embodiment 1
The preparation technology of the Weather-resisting powder coating of described replacement aluminum section bar chromizing treatment process is as follows:
(1) nano-material modified vibrin preparation, the median size of nano material is 18nm:
Nano aluminium oxide, nano zircite, nano zine oxide, nano silicon oxide are undertaken composite by the mass ratio of 2:2:1:1, nano material is scattered in the vibrin of DSM P5240 model of 140 ℃ of meltings, then through high-speed stirring dispersion machine high speed dispersion 30 minutes under 1800 revs/min of working parameters, the molten polyester of this modification is cooling, compressing tablet, broken nano-material modified vibrin.
(2) replace Weather-resisting powder coating formula and the preparation of aluminum section bar chromizing treatment process:
In the present embodiment, nano material addition accounts for 2% of powder coating total mass, and it is as follows that modification replaces aluminum section bar chromizing treatment process Weather-resisting powder coating formula:
| Formula starting material | Weight (g) |
| Modified polyester resin | 624 |
| Solidifying agent TGIC | 46 |
| Flow agent 588 | 10 |
| St-yrax | 3 |
| Air release agent | 4 |
| Wax powder | 2 |
| Barium sulfate filler | 71 |
| Titanium dioxide pigment | 230 |
| Acrylic elastomer | 10 |
| Total amount (g) | 1000 |
According to formulating of recipe system, formula starting material are mixed in sealing mixing tank, using powder coating melting extrusion equipment to carry out melting to it extrudes, cooling compressing tablet, then use powder coating sheet stock pulverizing mill to prepare modification and replace aluminum section bar chromizing treatment process Weather-resisting powder coating, control its meso-position radius particle diameter between 25-40 μ m, the powder of preparation is carried out to loading packing and both must replace the Weather-resisting powder coating of aluminum section bar chromizing treatment process.
Modification prepared by the present embodiment replaces aluminum section bar chromizing treatment process Weather-resisting powder coating except possessing good weathering resistance, preservative property and sticking power, pencil hardness reaches 3H grade, also there is good ultraviolet screener, automatically cleaning and anti-microbial effect, and other performance of filming all promotes to some extent than unmodified.
Embodiment 2
It is as follows that the present embodiment modification replaces aluminum section bar chromizing treatment process Weather-resisting powder coating preparation technology:
(1) nano-material modified vibrin preparation, the median size of nano material is 24nm:
Nano aluminium oxide, nano zircite, nano zine oxide, nano silicon oxide are undertaken composite by the mass ratio of 6:2:1:1, nano material is scattered in the vibrin of new 2441 models of Zhan of 130 ℃ of meltings, then through high-speed stirring dispersion machine high speed dispersion 30 minutes under 1600 revs/min of working parameters, the molten polyester of this modification is cooling, compressing tablet, broken nano-material modified vibrin.
(2) replace Weather-resisting powder coating formula and the preparation of aluminum section bar chromizing treatment process:
In the present embodiment, nano material addition accounts for 1% of powder coating total mass, and it is as follows that modification replaces aluminum section bar chromizing treatment process Weather-resisting powder coating formula:
| Formula starting material | Weight (g) |
| Modified polyester resin | 568 |
| Solidifying agent HAA | 42 |
| Flow agent 588 | 10 |
| St-yrax | 3 |
| Air release agent | 4 |
| Wax powder | 2 |
| Barium sulfate filler | 133 |
| Titanium dioxide pigment | 230 |
| Acrylic elastomer | 8 |
| Total amount (g) | 1000 |
According to formulating of recipe system, formula starting material are mixed in sealing mixing tank, using powder coating melting extrusion equipment to carry out melting to it extrudes, cooling compressing tablet, then use powder coating sheet stock pulverizing mill to prepare modification and replace aluminum section bar chromizing treatment process Weather-resisting powder coating, control its meso-position radius particle diameter between 25-40 μ m, the powder of preparation is carried out to loading packing and both obtained modification replacement aluminum section bar chromizing treatment process Weather-resisting powder coating.
Modification prepared by the present embodiment replaces aluminum section bar chromizing treatment process Weather-resisting powder coating except possessing good weathering resistance, preservative property and sticking power, pencil hardness reaches 3H grade, also there is good ultraviolet screener and self-cleaning function, and other performance of filming all promotes to some extent than unmodified.
Embodiment 3
It is as follows that the present embodiment modification replaces aluminum section bar chromizing treatment process Weather-resisting powder coating preparation technology:
(1) nano-material modified vibrin preparation, the median size of nano material is 20nm:
Nano aluminium oxide, nano zircite, nano zine oxide, nano silicon oxide are undertaken composite by the mass ratio of 3:6:1:1, nano material is scattered in the vibrin of refreshing sword SJ4E model of 140 ℃ of meltings, then through high-speed stirring dispersion machine high speed dispersion 30 minutes under 1600 revs/min of working parameters, the molten polyester of this modification is cooling, compressing tablet, broken nano-material modified vibrin.
(2) replace Weather-resisting powder coating formula and the preparation of aluminum section bar chromizing treatment process:
In the present embodiment, nano material addition accounts for 4% of powder coating total mass, and it is as follows that modification replaces aluminum section bar chromizing treatment process Weather-resisting powder coating formula:
| Formula starting material | Weight (g) |
| Modified polyester resin | 691 |
| Solidifying agent TGIC | 49 |
| Flow agent 588 | 12 |
| St-yrax | 4 |
| Air release agent | 4 |
| Wax powder | 2 |
| Barium sulfate filler | 11 |
| Titanium dioxide pigment | 220 |
| Acrylic elastomer | 7 |
| Total amount (g) | 1000 |
According to formulating of recipe system, formula starting material are mixed in sealing mixing tank, using powder coating melting extrusion equipment to carry out melting to it extrudes, cooling compressing tablet, then use powder coating sheet stock pulverizing mill to prepare modification and replace aluminum section bar chromizing treatment process Weather-resisting powder coating, control its meso-position radius particle diameter between 28-34 μ m, the powder of preparation is carried out to loading packing and both obtained modification replacement aluminum section bar chromizing treatment process Weather-resisting powder coating.
Modification prepared by the present embodiment replaces aluminum section bar chromizing treatment process Weather-resisting powder coating except possessing good weathering resistance, preservative property and sticking power, and its pencil hardness reaches 3H, and other performance of filming all promotes to some extent than unmodified.
Wherein, the preparation of unmodified powder coating: except do not add nano material all the other as embodiment 1.
Embodiment 1-3 gained powder coating and unmodified powder coating are carried out to performance test, and result is as follows:
The performance test results table that table 1 powder coating is filmed
The powder coating of Weather-resisting powder coating of the replacement aluminum section bar chromizing treatment process the present invention relates to and the powder coating of unmodified powder coating are accelerated to contrast burn-in test.Test event is QUV-B test, and test condition is 50 ℃ of UV illumination 4 hours, and in 40 ℃ of Water, steam circulation tests 4 hours, test sample plate, for the curing aluminium material model of spraying, the results are shown in Table 2.
Table 2 accelerated deterioration test result contrast table
Data by table 2 test duration and total color difference can find out, its weathering resistance of powder coating of the Weather-resisting powder coating of replacement aluminum section bar chromizing treatment process of the present invention is obviously better than the powder coating of unmodified powder coating.
By embodiment 1-3 gained powder coating and unmodified powder coating, by corona spray gun, be sprayed on the aluminium sheet without chromate treating, through the acid salt fog contrast test (according to ISO 9227 standard tests) of the laggard row of overcuring, and increased unmodified powder coating and be sprayed at the model through the aluminium sheet of chromate treating, carry out parallel laboratory test simultaneously, observe at the appointed time surface and change and test sticking power (GB/T 9286-1998), result is as follows:
The acid resistance salt fog the performance test results table that table 3 powder coating is filmed
From table 3, we may find, the Weather-resisting powder coating of the replacement aluminum section bar chromizing treatment process that this patent is mentioned, in acid resistance salt fog performance, arrive through chromaking pre-treatment effect, like this saving and technique and the heavy metal contamination of having avoided chromaking to bring.
The embodiment gonosome of being hit by a bullet is the TPE-V (PP/EPDM) 4000 that DSM N. V. produces; Preferred German Bi Ke CERAFLOUR 961 air release agents of air release agent, by Guangzhou, Yi Tong polymer Science and Technology Ltd. provides.
Claims (8)
1. a Weather-resisting powder coating that replaces aluminum section bar chromizing treatment process, comprise vibrin, solidifying agent, flow agent, st-yrax, air release agent, wax powder, filler, pigment, acrylic elastomer, it is characterized in that: in vibrin, add nano material and carry out modification, described nano material is the combination of nano aluminium oxide, nano zircite, nano zine oxide and nano silicon oxide.
2. powder coating according to claim 1, is characterized in that: nano material particle diameter is between 10-100nm, and nano material consumption accounts for the 0.3-4% of powder coating total mass.
3. powder coating according to claim 1, is characterized in that: the mass ratio of nano aluminium oxide, nano zircite, nano zine oxide and nano silicon oxide is 2-6:2-6:1:1.
4. powder coating according to claim 1, is characterized in that: vibrin is the saturated terminal carboxyl polyester resin of weather resistant.
5. powder coating according to claim 1, is characterized in that: solidifying agent is hydroxyalkyl amide or isocyanuric acid three-glycidyl ester.
6. powder coating according to claim 1, it is characterized in that: modification is first nano material to be scattered in the vibrin of 130-160 ℃ of melting, and then through stirring dispersion machine, under 1400-2200 rev/min, disperse 20-40 minute, finally molten polyester is cooling, compressing tablet, fragmentation again.
7. powder coating according to claim 1, is characterized in that: by the raw material with mass percent, made:
8. a preparation method for the arbitrary described powder coating of claim 1-7, is characterized in that comprising the following steps:
(1) first nano material is scattered in the vibrin of 130-160 ℃ of melting, and then under 1400-2200 rev/min, disperses 20-40 minute through stirring dispersion machine, finally molten polyester is cooling, compressing tablet, fragmentation obtain modified polyester resin again;
(2) again modified polyester resin, solidifying agent, flow agent, st-yrax, air release agent, wax powder, filler, pigment, acrylic elastomer are mixed, through melting extrude, cooling compressing tablet, pulverizing, screening make.
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