Shanghai Daoqin Plastics Co., Ltd.

         recycled plastics quality non key/critical, if recycling utilizing quality control good, effect/influence product property can quality. recycled material due to one-time production outer ring, can can new factors, from formed new product generate. recycled material methods is types, separation is material methods, chemical methods and device analysis method.

         material methods

         material methods is according to plastics material property identification, appearance, density, melt, strong/high degree property 质, solvent understanding property and other. below/following is from more year technology summary 出 辨别办 method:

         most simple methods is: will plastics film for cationic upper is has 星点, usually has is recycled, basic has is new material. (因 is recycled material color 不一样, 手感不一样, has very more 杂质, color good, natural color comparison less.)

         from appearance upper recycled plastics gloss degree 差, pellets surface 黯淡, large small non-uniform, has 杂质, generally belt/tape has color or 呈灰白;而 new material gloss degree very good, pellets surface light slip, large small uniform, 不含杂志, large 都呈无 color or white. new material color light 亮, material color dark 淡. another if need fine identification, can from below/following several 方面进行区 separation:

         color: is belt/tape ratio need good, tube/pipe is what color.

         gloss: gloss good ratio has gloss need good, is material surface color. from material mechanical properties upper recycled material already aging degradation, separation polymer/macromolecule by oxidation, material mechanical properties has decline, recycled 次数越 more property can decline 越厉害.

         wire drawing: (CaCO3 more wire drawing 肯定不 good, reinforcement 也拉不出 filament)吹灭火 rear, use iron material speed melt 体, rear speed 拉开, filament formed is is uniform, is uniform is good material, more 拉几次 rear, will filament heavy 叠起, again 次拉开, it has elastic property, can can again 次拉开而不断, or 拉开一段距离 rear is good material.

        闻 odor (various plastics 味都不 same, flame retardant and other);

         above can 确认, again use 火烧, in process in speed 冒黑烟 or melt speed lower 滴, is good material.

        浮 water: need has water 即差, if upper also 不敢肯定, or 拿不定主意, that has machine.

         chemical methods

         chemical methods is according to plastics chemical property 质进行鉴定, 包括燃烧实验, hot understanding 实验, color reaction and other. below/following is various plastics identification method, 以供参考:

        1, propylene PP容 easy melt 滴落, upper lower less 继续燃烧石油味

        2, polyethylene (PE) PE容 easy melt 滴落, upper lower 蓝继续燃烧石 wax odor

        3, polyvinyl chloride (PVC) PVC difficult soft upper lower has 烟离火熄灭 刺激 property acid 味

        4, polyoxymethylene (POM) POM容 easy melt upper lower 蓝, 无烟继续燃烧 strong/high 烈刺激甲 aldehyde 味

        5, polystyrene (PS) PS容 easy soft 化起泡橙黄 color, concentrated 黑烟, 炭末继续燃烧 surface property light 亮特殊 ethylene odor

        6, nylon PA slow melt 滴落, slow slow 熄灭特殊羊毛, odor

        7, polymethyl methacrylate (PMMA) PMMA容 easy 熔化起泡, shallow color, 质白, 无烟继续燃烧, strong/high 烈花果臭味, 腐烂蔬菜味

        8, polycarbonate (PC) PC容 easy, soft 化起泡 has small amount 黑烟离火熄灭无特殊味

        9, PTFE PTFE不燃烧; in in separation understanding 出刺鼻 fluorine hydrogen odor

        10, terephthalic acid ester PET容 easy soft 化起泡橙 color, has small amount 黑烟离火 slow slow acid 味

        11, propylene 晴- butadiene - styrene copolymer ABS缓 slow soft 化燃烧, 无滴落黄 color, 黑烟继续燃烧特殊 odor.

        仪 device analysis method

        仪 device analysis method is utilizing various material analysis testing device for plastics analysis testing, 包括红 outer light 谱, outer light 谱, and other 离子发射 light 谱 差示扫描 amount hot method (DSC), machine hot analysis (TMA), hot heavy (TGA), electrical 镜(SEM), can analysis (EDS) and other, tool has 鉴定时效 fast, degree high and other advantages, is cost high.

        案例:

         certain lighting in application 端发现 use 2 month rear 灯珠支架 has phenomenon, testing 鉴定发黄 causes. for 灯珠做切 sheet/slice electrical 镜SEM观察, 发现PPA支架 internal has a large amount of 孔隙, is type water material 特征. this is is PPA plastics recycling recycled process in generate many or other defect, and 孔隙 数 amount recycled increase more increase.

         testing machine 构指出, internal has a large amount of PPA支架肯定 is water material, is water material PPA支架不一定 has 空隙, in to this type of 情况时, also combined other material testing methods 进一步判定.

         small 提示

        1． surface light degree is amount type recycled material pellets quality and other grade important indicators, excellent recycled material surface light lubricated.

        2． transparent degree is amount in high recycled material pellets quality and other grade important indicators, has transparent degree recycled material, quality 都不错.

        3． color uniform and is amount has color recycled material pellets quality and other grade important indicators, main/primary has 白, 乳白, 黄, 蓝, black and other color.

        4． pellets degree is recycled process water important 方面, process water low main/primary performance is defect, pellets hydrophobic 松.

        5．看 recycled pellets is 否浮沉于 water can used for 检验PP, PE pellets filling material content.