CN1053686C - Water depainting method for plastic surface paint and its depainting composition - Google Patents
Water depainting method for plastic surface paint and its depainting composition Download PDFInfo
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- CN1053686C CN1053686C CN95119028A CN95119028A CN1053686C CN 1053686 C CN1053686 C CN 1053686C CN 95119028 A CN95119028 A CN 95119028A CN 95119028 A CN95119028 A CN 95119028A CN 1053686 C CN1053686 C CN 1053686C
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- 239000000203 mixture Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229920003023 plastic Polymers 0.000 title claims abstract description 34
- 239000004033 plastic Substances 0.000 title claims abstract description 34
- 239000003973 paint Substances 0.000 title claims abstract description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000003513 alkali Substances 0.000 claims abstract description 5
- 238000000576 coating method Methods 0.000 claims description 127
- 239000011248 coating agent Substances 0.000 claims description 126
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 claims description 27
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000001914 filtration Methods 0.000 claims description 13
- 239000000206 moulding compound Substances 0.000 claims description 13
- 229920003002 synthetic resin Polymers 0.000 claims description 13
- 239000000057 synthetic resin Substances 0.000 claims description 13
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 12
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 10
- BTANRVKWQNVYAZ-UHFFFAOYSA-N butan-2-ol Chemical compound CCC(C)O BTANRVKWQNVYAZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 7
- 229920002678 cellulose Polymers 0.000 claims description 6
- 239000001913 cellulose Substances 0.000 claims description 6
- 150000001298 alcohols Chemical class 0.000 claims description 5
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 5
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 4
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 claims description 4
- 238000004821 distillation Methods 0.000 claims description 4
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical group C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims 4
- 239000004793 Polystyrene Substances 0.000 claims 4
- 239000004800 polyvinyl chloride Substances 0.000 claims 4
- 229920000915 polyvinyl chloride Polymers 0.000 claims 4
- 239000004698 Polyethylene Substances 0.000 claims 3
- 239000004743 Polypropylene Substances 0.000 claims 3
- 229920001577 copolymer Polymers 0.000 claims 3
- -1 polyethylene Polymers 0.000 claims 3
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims 2
- 229920000573 polyethylene Polymers 0.000 claims 2
- 229920002223 polystyrene Polymers 0.000 claims 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Natural products C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims 1
- 229920001155 polypropylene Polymers 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 34
- 239000002699 waste material Substances 0.000 abstract description 3
- 239000002585 base Substances 0.000 abstract description 2
- 230000008929 regeneration Effects 0.000 abstract description 2
- 238000011069 regeneration method Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- 230000000704 physical effect Effects 0.000 abstract 1
- 230000035939 shock Effects 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 15
- 238000010298 pulverizing process Methods 0.000 description 10
- 230000002742 anti-folding effect Effects 0.000 description 9
- 238000004587 chromatography analysis Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- 238000005469 granulation Methods 0.000 description 8
- 230000003179 granulation Effects 0.000 description 8
- 239000013502 plastic waste Substances 0.000 description 8
- 238000003756 stirring Methods 0.000 description 7
- 238000001149 thermolysis Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000003137 locomotive effect Effects 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 229920000426 Microplastic Polymers 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- 206010013786 Dry skin Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000013011 aqueous formulation Substances 0.000 description 1
- 229940043232 butyl acetate Drugs 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
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- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The present invention relates to a water depainting method for plastic surface paints and a depainting composition thereof. A plastic surface paint is removed by using a water solution of the depainting composition comprising specific alcohol and alkali. The water solution of the depainting composition is mixed with a pulverized material of waste plastics whose surfaces have paints first, and then the mixture is stirred and heated to 60 to 130 DEG C. The depainting rate of the method of the present invention is approximately as high as 95%; a regeneration material is high in purity and favorable in physical properties, particularly in shock resistant properties; in addition, as the water base depainting composition is used, the method conforms to the requirements of environmental protection and industrial safety.
Description
The coating removal composition that present invention is directed to a kind of frosting coating coating removal method and used is particularly relevant for the coating removal technology of using with the aqueous formulation of specific alcohols and alkali.
The method of tradition plastic waste topcoating removal has the filtration of extrusion, organic solvent removal, sandblast coating removal method and low temperature coating removal method etc.
See also the 1st figure.The 1st figure is the synoptic diagram that extrudes filtration method.Its method is passed through filter screen for the filtering net of the different meshes of packing into the plastics fusion in extruding machine.Because dope layer is difficult for fusion and is denial in outside the filter screen, reaches the effect of filtering separation.Yet this kind method is because the filter screen hole is limited, and some coating also can fusion along with plastics together by filter screen, make the quality of reworked material to promote and be its shortcoming.
Organic solvent coating removal method is to use methylene dichloride, toluene, dimethylbenzene, dimethyl formamide, butylacetate and commercially available paint remover that the coating of frosting is removed.Yet these organic solvents also can corrode plastics except the meeting dissolution of coatings, influence the rerum natura of reworked material, and organic solvent has very big harm for HUMAN HEALTH.
Sandblast coating removal method be sandblast in frosting to reach the effect of coating removal.But because song of plastic component is in the wrong, uneven, thus can only operate in a small amount, can't mass production, so can't bring into play the economic benefit that waste plastics recovery utilizes again.
Low temperature coating removal method is in liquid nitrogen low temperature (approximately-150 ℃) operation, and it makes the high score of enamelled coating
Sub-material is when Tg (glass transition temp) is following, and rerum natura can become embrittlement, only needs a little external force to apply, can make enamelled coating embrittlement be full of cracks and come off, so contain on the plastic component of enamelled coating, both all belong to macromolecular material, the all easily serious be full of cracks of enamelled coating and plastic component is not so conform to the coating removal requirement.
Because the shortcoming of above known technology, the present invention's purpose is water-based coating removal method and the employed coating removal composition that a kind of frosting coating will be provided.Utilize this water-based coating removal method and coating removal composition can solve problem and the shortcoming that above known technology meets with.
In order to reach the purpose of the invention described above, the present invention's frosting coating removal technology is to use and comprises that 40-90wt% is selected from methyl alcohol, ethanol, n-propyl alcohol, Virahol, propyl carbinol, sec-butyl alcohol, reaches the alcohols of trimethyl carbinol and composition thereof and be less than the water-based coating removal composition that 10wt% is selected from the alkali of potassium hydroxide, sodium hydroxide, ammoniacal liquor.
This water-based coating removal composition elder generation mixes with the synthetic resin moulding compound particle that the surface has coating, and then is heated to 60-130 ℃ so that the coating on the synthetic resin moulding compound particle is removed.Usually the consumption of synthetic resin moulding compound particle is the 20-60 weight % of coating removal composition.The coating water-based coating removal composition and the synthetic resin moulding compound particle that separate with the synthetic resin moulding compound particle utilize the method for for example filtration to make solid-liquid separation again.The plastics particle that separates back is through washing, drying or extrude granulation again and can use.Water-based coating removal composition then can reclaim by for example distillating method and re-use.
According to one of the present invention feature, the present invention's method is specially adapted to urethanum-acrylic acid series on ABS, PP, PE, PS and PVC frosting and cellulose paint are removed.
According to another feature of the present invention, the plastics that coating has been removed after filtration, processing procedures such as washing, drying, can be through extruding granulation process or directly being packaged as the reprocessed plastic(s) grain.If the size of plastic grain less than 5mm, can be saved the process that extrudes granulation, directly be packaged into the reprocessed plastic(s) grain.If then need to extrude the reprocessed plastic(s) grain that granulation is a smaller szie, so that the operation of back segments such as injection molding processing greater than 5mm.
Another feature according to the present invention, because plastics itself can be not compatible with the water-based paint remover, under the suitable in the present invention coating removal operational condition, paint remover can not corrode the attack plastics, and without extruding granulation thermal treatment again, so can keep certain rerum natura quality; The reprocessed plastic(s) grain can use separately or mix with virgin material joins use, all can reach re-set target, and what promote reworked material just uses level.
According to the present invention's a feature again, alcohols can be through the distillation purifying processing procedure, and regeneration heavily is laminated with work, reaches economic benefit, and paint sludge is separated out through chemical analysis nontoxicity material, can bury processing according to general waste, and its amount is few, only is 2% of former plastics weight.
Reach accompanying drawing by the following examples and describe the present invention in detail, but the purpose of these embodiment is not the scope that is used for limiting the present invention for illustration the present invention only.The simple declaration of accompanying drawing
Fig. 1 extrudes the synoptic diagram of filtration method for known technology;
Fig. 2 is the principle schematic of the present invention's chemical coating removal method;
Fig. 3 is the detail flowchart of the present invention's water-based coating removal method; And
Fig. 4 is the present invention's coating removal and batching simple flow chart.
Now see also Fig. 2.According to the present invention, the plastics that have coating when the surface, when for example reclaiming in the water-based coating removal composition that safety lever impregnated in the present invention, at first top coat can decompose and be scattered in the solution, and then base coat also decomposes, is scattered in the solution and can reach the effect that plastics and coating fully separate.
See also the 3rd figure again.The pulverizing plastic pellet that the surface has coating is delivered to the paint remover that reactive tank 1 adds the present invention earlier, through whipping step 2 after heating steps 3 is heated to 60-130 ℃ is dispersed among the paint remover with the coating dissolving with the plastic pellet surface.After being cooled to room temperature, cooling step 4 makes solid-liquid separation 5 afterwards.Solid-liquid separation 5 can be used filtration method.The solid of isolating is pulverized plastic pellet and is finished product 9 through water-washing step 6, drying step 7 and after packing 8, can be through extruding granulation process or directly being packaged as the reprocessed plastic(s) grain.
Filtrate 51 after the solid-liquid separation is the mixture of paint remover and the coating that dissolves.This filtrate 51 is earlier through whipping step 52, and heating steps 53 backs distill 54.The paint remover 55 of distillation recovery is recycled to reactive tank 1 and re-uses.The residue 541 of distillation is step 542 after filtration again.The mud 546 that filters out is buried processing after solidifying 547.Filtrate 543 is then again through neutralization procedure 544 dischargings.
Below be described in detail the present invention by embodiment.
Embodiment 1
With weight ratio: water 45.0%, the ratio of methyl alcohol 50.0% and potassium hydroxide 5.0% mixes the coating removal composition.
Mix with the pulverizing of the ABS plastic shell on the locomotive (coating that adheres on it is urethanum-acrylic acid series coating) and with the coating removal composition.Mixture ratio is coating removal composition 100 weight parts, ABS plastic waste material 25-50 weight part.
The gained mixture was stirred 4-8 hour under 65-75 ℃ and stirring velocity 30-120rpm, and obtain removing the ABS plastic reworked material of coating according to the flow process of Fig. 3.
Coating removal rate (%) the results are shown in table 1 with thermolysis gas phase chromatographic analysis test.And the rerum natura of ABS plastic reworked material (tension intensity, elongation, folding strength, anti-folding coefficient of elasticity, impact strength and heat-drawn wire) is tested according to ASTM, and test result is shown in table 1.
Embodiment 2
With weight ratio: water 45.0%, the ratio of ethanol 50.0% and potassium hydroxide 5.0% mixes the coating removal composition.
Mix with the pulverizing of the PP plastics safety lever on the automobile (coating that adheres on it is cellulose paint) and with the coating removal composition.Mixture ratio is coating removal composition 100 weight parts, PP plastic waste 25-50 weight part.
The mixture of gained was stirred 4-8 hour under 75-85 ℃ of temperature and stirring velocity 30-120rpm, and obtain removing the plastic reclaimed material of PP of coating according to the flow process of Fig. 3.
Coating removal rate (%) is surveyed with the chromatographic analysis of thermolysis gas phase, the results are shown in table 2.And the rerum natura of the plastic reclaimed material of PP (tension intensity, elongation, anti-strong examination, anti-folding coefficient of elasticity, impact strength and the heat-drawn wire of rolling over) is tested according to ASTM, and test result is shown in table 2.
Embodiment 3
With weight ratio: water 35.0%, the ratio of n-propyl alcohol 60.0% and ammoniacal liquor 5.0% mixes the coating removal composition.
Mix with the pulverizing of the ABS plastic shell on the locomotive (coating that adheres on it is urethanum-acrylic acid series coating) and with the coating removal composition.Mixture ratio is coating removal composition 100 weight parts, ABS plastic waste material 25-50 weight part.
The mixture of gained was stirred 4-8 hour under 95-105 ℃ of temperature and stirring velocity 30-120rpm, and obtain removing the ABS plastic reworked material of coating according to the flow process of Fig. 3.
Coating removal rate (%) the results are shown in table 1 with thermo-cracking gas phase chromatographic analysis test.And the rerum natura of ABS plastic reworked material (tension intensity, elongation, folding strength, anti-folding coefficient of elasticity, impact strength and heat-drawn wire) is tested according to ASTM, and test result is shown in table 1.
Embodiment 4
With weight ratio: water 25.0%, the ratio of Virahol 70.0% and sodium hydroxide 5.0% mixes the coating removal composition.
Mix with the pulverizing of the PP plastics safety lever on the automobile (coating that adheres on it is cellulose paint) and with the coating removal composition.Mixture ratio is coating removal composition 100 weight parts, PP plastic waste 25-50 weight part.
The gained mixture was stirred 4-8 hour under 80-90 ℃ of temperature and stirring velocity 30-120rpm, and obtain removing the ABS plastic reworked material of coating according to the flow process of Fig. 3.
Coating removal rate (%) the results are shown in table 2 with thermolysis gas phase chromatographic analysis test.And the rerum natura of ABS plastic reworked material (tension intensity, elongation, folding strength, anti-folding coefficient of elasticity, impact strength and heat-drawn wire) is tested according to ASTM, and test result is shown in table 2.
Embodiment 5
With weight ratio: water 25.0%, the ratio of n-propyl alcohol 70.0% and potassium hydroxide 5.0% mixes the coating removal composition.
Mix with the pulverizing of the ABS plastic shell on the locomotive (coating of attached work is urethanum-acrylic acid series coating on it) and with the coating removal composition.Mixture ratio is coating removal composition 100 weight parts, ABS plastic waste material 25-50 weight part.
The gained mixture was stirred 4-8 hour under 115-125 ℃ of temperature and stirring velocity 30-120rpm, and obtain the ABS plastic reworked material of coating according to the flow process of Fig. 3.
Coating removal rate (%) the results are shown in table 1 with thermolysis gas phase chromatographic analysis test.And the rerum natura of ABS plastic reworked material (tension intensity, elongation, folding strength, anti-folding coefficient of elasticity, impact strength and heat-drawn wire) is tested according to ASTM, and test result is shown in table 1.
Embodiment 6
With weight ratio: water 15.0%, the ratio of sec-butyl alcohol 80.0% and sodium hydroxide 5.0% mixes the coating removal composition.
Mix with the pulverizing of the PP plastics safety lever on the automobile (coating that adheres on it is cellulose paint) and with the coating removal composition.Mixture ratio is coating removal composition 100 weight parts, PP plastic waste 25-50 weight part.
The gained mixture was stirred 8-16 hour under 95-105 ℃ of temperature and stirring velocity 30-120rpm, and obtain removing the ABS plastic reworked material of coating according to the flow process of Fig. 3.
Coating removal rate (%) the results are shown in table 2 with thermolysis gas phase chromatographic analysis test.And the rerum natura of ABS plastic reworked material (tension intensity, elongation, folding strength, anti-folding coefficient of elasticity, impact strength and heat-drawn wire) is tested according to ASTM, and test result is shown in table 2.
Embodiment 7
With weight ratio: water 15.0%, the ratio of the trimethyl carbinol 50.0% and ammoniacal liquor 5.0% mixes the coating removal composition.
Mix with the pulverizing of the ABS plastic shell on the locomotive (coating that adheres on it is urethanum-acrylic acid series coating) and with the coating removal composition.Mixture ratio is coating removal composition 100 weight parts, ABS plastic waste material 25-50 weight part.
The gained mixture was stirred 8-16 hour under 80-90 ℃ of temperature and stirring velocity 30-120rpm, and obtain removing the ABS plastic reworked material of coating according to the flow process of Fig. 3.
Coating removal rate (%) the results are shown in table 1 with thermolysis gas phase chromatographic analysis test.And the rerum natura of ABS plastic reworked material (tension intensity, elongation, folding strength, anti-folding coefficient of elasticity, impact strength and heat-drawn wire) is tested according to ASTM, and test result is shown in table 1.
The useless ABS plastic rerum natura that table 1 extrudes filtration and water-based coating removal compares
| Virgin material | Extrude and filter | Water-based coating removal example (1) | Example (3) | Example (5) | Example (7) | Testing method | |
| Tension intensity (Y.P.) kgf/cm 2 | 380 | 340.5 | 361.5 | 368.5 | 366.8 | 364.8 | ASTM D 638 |
| Tension intensity (B.P.) kgf/cm 2 | 327.4 | 308.5 | 314.9 | 306.8 | 329.7 | 312.3 | ASTM D 638 |
| Elongation % | 11.8 | 3.8 | 5.8 | 5.5 | 5.2 | 5.9 | AST D 638 |
| Folding strength kgf/cm 2 | 625 | 586 | 630 | 610 | 620 | 615 | AST D 790 |
| Anti-folding coefficient of elasticity kgf/cm 2 | 21350 | 20549 | 20970 | 20900 | 20640 | 20530 | ASTM D 790 |
| Impact strength ft-lb/in | 4.9 | 1.7 | 3.5 | 3.6 | 3.4 | 3.5 | ASTM D 256 |
| Heat-drawn wire (HDT) ℃ | 84 | 85.5 | 85 | 86 | 86 | 85.5 | ASTM D 648 |
| Coating removal rate % | 62 | 95 | 96 | 94 | 95 | PGC * |
*The chromatographic analysis of thermo-cracking gas phase
The plastic reclaimed rerum natura of useless PP that table 2 extrudes filtration and water-based coating removal compares
| Virgin material | Extrude and filter | Example (2) | Example (4) | Example (6) | Testing method | |
| Tension intensity (Yield point) kg/cm 2 | 272 | 240 | 265 | 250 | 240 | ASTM 7638 |
| Tension intensity (Break point) kgf/cm 2 | 188 | 150 | 176 | 165 | 160 | ASTM 7638 |
| Elongation % | 600 | 45 | 50 | 50 | 50 | ASTM 7638 |
| Folding strength kgf/cm 2 | 353 | 303 | 320 | 318 | 308 | ASTM D 790 |
| Anti-folding coefficient of elasticity kgf/cm 2 | 11470 | 10080 | 11350 | 10750 | 10650 | ASTM D 790 |
| Impact strength ft-lb/in | 1.52 | 0.85 | 1.42 | 1.32 | 1.30 | ASTM D 256 |
| Heat-drawn wire (HDT) ℃ | 86 | 86.5 | 86 | 87 | 86 | ASTM D 256 |
| Coating removal rate % | 65 | 98 | 98 | 98 | PGC * |
*The chromatographic analysis of thermo-cracking gas phase
The plastics material that coating removal is filtered in plastics material behind the coating removal among the present invention and traditional extrusion is made one relatively (shown in table one and table two).It is preferable that the ABS specific pressure of water-based coating removal goes out the rerum natura of filtering ABS, especially impact strength; The situation of PP is as the same, and especially the coating removal effect of PP is better than ABS, and this is because PP material itself does not have the polar functional group, with the then ability of lacquer class relatively poor due to.
With the plastics behind the coating removal among the above embodiment, through processes such as washing, dryings.If the particle size of pulverizing material greater than 5mm, needs through extruding granulation, so that processing procedures such as the batching of back segment and ejaculation processing.The particle size of pulverizing material can directly enter processing procedures (shown in the 4th figure) such as batching and ejaculation processing without extruding the granulation processing procedure originally just less than 5mm.
Claims (9)
1. water-based coating removal method that frosting coating is removed may further comprise the steps:
(a) the synthetic resin moulding compound particle that the surface is had coating mixes with a kind of water-based coating removal composition, wherein
This water-based coating removal composition comprises that 50-80 weight % is selected from methyl alcohol, ethanol, n-propyl alcohol, Virahol, propyl carbinol, sec-butyl alcohol, reaches the alcohols of the trimethyl carbinol or its mixture and be less than the alkali that 10 weight % are selected from potassium hydroxide, sodium hydroxide, ammoniacal liquor, and the amount of this synthetic resin moulding compound particle is the 20-60 weight % of water-based coating removal composition;
(b) with the mixture heating up of this synthetic resin moulding compound particle and water-based coating removal composition to 60-130 ℃ so that the coating on the synthetic resin moulding compound particle is removed.
2. coating removal method as claimed in claim 1, other may further comprise the steps:
(c) will remove the synthetic resin moulding compound particle of coating and water-based coating removal composition and coating and make solid-liquid separation; Afterwards
(d) reclaim water-based coating removal composition.
3. coating removal method as claimed in claim 1, wherein this synthetic resin moulding compound particle is selected from ABS (vinyl cyanide, divinyl, styrene copolymer), PP (polyethylene), PS (polystyrene) and PVC (polyvinyl chloride).
4. coating removal method as claimed in claim 1, wherein the coating that adheres on this synthetic resin moulding compound particle is urethanum-acrylic acid series coating and cellulose paint.
5. coating removal method as claimed in claim 1, wherein the amount of this synthetic resin moulding compound particle is the 25-50 weight % of water-based coating removal composition.
6. coating removal method as claimed in claim 2, wherein the method for solid-liquid separation is for filtering.
7. coating removal method as claimed in claim 2 wherein reclaims the water-based copolymer composition by distillation.
8. one kind is used for the water-based coating removal composition that frosting coating is removed is comprised:
(a) 40-90 weight % is selected from the alcohols of methyl alcohol, ethanol, n-propyl alcohol, Virahol, propyl carbinol, sec-butyl alcohol and the trimethyl carbinol or its mixture;
(b) 5 weight % are selected from the alkali of potassium hydroxide, sodium hydroxide and ammoniacal liquor.
9. water-based coating removal composition as claimed in claim 8, said composition are used to remove urethanum-acrylic acid series coating and the cellulose paint attached on the plastics that are selected from ABS (vinyl cyanide, divinyl, styrol copolymer), PP (polypropylene), PE (polyethylene), PS (polystyrene) and PVC (polyvinyl chloride).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95119028A CN1053686C (en) | 1995-11-04 | 1995-11-04 | Water depainting method for plastic surface paint and its depainting composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95119028A CN1053686C (en) | 1995-11-04 | 1995-11-04 | Water depainting method for plastic surface paint and its depainting composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1149606A CN1149606A (en) | 1997-05-14 |
| CN1053686C true CN1053686C (en) | 2000-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95119028A Expired - Fee Related CN1053686C (en) | 1995-11-04 | 1995-11-04 | Water depainting method for plastic surface paint and its depainting composition |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104974588A (en) * | 2015-05-26 | 2015-10-14 | 东莞景丰塑胶制品有限公司 | Paint remover |
| CN115093742A (en) * | 2022-07-16 | 2022-09-23 | 任彭 | Paint removing liquid and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4769170A (en) * | 1985-05-22 | 1988-09-06 | Mitsubishi Yuka Fine Chemicals Co., Ltd. | Washing solution for printing ink |
-
1995
- 1995-11-04 CN CN95119028A patent/CN1053686C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4769170A (en) * | 1985-05-22 | 1988-09-06 | Mitsubishi Yuka Fine Chemicals Co., Ltd. | Washing solution for printing ink |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1149606A (en) | 1997-05-14 |
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