Processing Qualities and Applications of Injection Molded Spray‑free Plastic Parts

doi:10.19491/j.issn.1001-9278.2020.06.018

Abstract

Abstract:

This paper introduced the concept, composition and development status of spray?free plastics and especially discussed the surface quality of spray?free plastics, the formation reasons and relevant solutions of defects, and the application of numerical simulation for the prediction of processing quality. Moreover, the influencing factors of weather resistance and mechanical properties of spray?free plastic parts were analyzed. The application prospect and development direction of spray?free plastics were summarized.

Key words: spray?free plastics, injection molding, surface defect, numerical simulation, mechanical property

CLC Number:

TQ327.8

Beijing YANG, Xu YANG, Jingying SU, Haimei LI. Processing Qualities and Applications of Injection Molded Spray‑free Plastic Parts[J]. China Plastics, 2020, 34(6): 118-125.

Figures/Tables 7

指标	物质名称							参考文献
指标	PP	PA	PC	ABS	SAN	ABS/PMMA	PA/ABS	参考文献
透明性?	×	×	√	×	√	×	×	[8]
颜料种类	铝粉、铜粉、珠光粉、玻片等							[2?3]
颜料尺寸	几~百微米							[3,6]
添加剂	颜料分散剂、抗氧化剂、树脂基体耐老化、耐划伤剂、与颜料相容性助剂等							[1,3,6]
颜料含量	一般质量分数1 %~4 %							[7]

Tab.1. Information of components of spray?free plastics

Fig.1. Schematic diagram of the influence of surface roughness on reflection field and diffuse field

Fig.2. Influence of filler shape regularity and size on surface quality of samples

Fig.3. Schematic diagram of melt line and generating of spray?free plastic parts

Fig.4. Schematic diagram of flow marks and generating of spray?free plastic parts

Fig.5. Schematic diagram of orientation of aluminum flakes during injection molding

Fig.6. Schematic diagram of simulation prediction and experimental results

References 44

1	林洁龙,杨波,丁正亚,等. 免喷涂外观美学树脂的应用[J]. 工程塑料应用, 2016, 44(10): 36‑40.
	LIN J L, YANG B, DING Z Y, et al.Applied of Paint‑Free Resin with Aesthetics Exterior[J]. Engineering Plastics Application, 2016, 44(10): 36‑40.
2	梁耀文,张军,胡新国. 免喷涂材料浅析及在冰箱的应用研究[C]//2017年中国家用电器技术大会论文集. 合肥: 中国轻工业出版社, 2017. 109‑117.
3	周启花,张扬,雷明辉. 免喷涂材料及其应用概述[J]. 广东化工, 2019, 46(16): 94‑96.
	ZHOU Q H, ZHANG Y, LEI M H. Overview of Spray‑Free Materials and Their Appications[J]. Guangdong Chemical, 2019, 46(16): 94‑96.
4	RUSSELL L. Today's Aluminum Pigments[J].JCT Coa⁃tings Tech, 2004(7): 48‑50.
5	SUNG L P, NADAL M E, MCKNIGHT M E, et al.Optical Reflectance of Metallic Coatings: Effect of Aluminum Flake Orientation[J]. Journal of Coatings Technology, 2002, 74(932): 55‑63.
6	袁海兵,郝源增,陈瑜,等. 铝颜料对免喷涂塑料熔接痕影响的研究[C]//2014年中国家用电器技术大会论文集.宁波: 中国轻工业出版社, 2014. 793‑796.
7	袁海兵. 铝颜料在免喷涂聚丙烯复合材料中的应用研究[J]. 广东化工, 2013, 40(10): 38‑39.
	YUAN H B. Applied Research of Aluminum Pigment in the Spray‑Free Polypropylene Composites[J].Guangdong Chemical, 2013, 40(10): 38‑39.
8	黄丽. 高分子材料[M]. 北京: 化学工业出版社, 2009.39‑111.
9	吴园,董建廷,蔡训儒,等. 类喷涂零部件设计要点概述[J]. 家电科技, 2017(7): 78‑81.
	WU Y, DONG J T, CAI X R, et al. Avoid Spraying Parts Design Overview[J]. Home Appliance Technology, 2017(7): 78‑81.
10	杜岩岩,刘春亮,陈宜川,等. 绿色材料在家电产品中的应用[J]. 塑料工业, 2016, 44(6): 1‑4.
	DU Y Y, LIU C L, CHEN Y C, et al. Application of Green Materials in Home Appliance[J]. China Plastics Industry, 2016, 44(6): 1‑4.
11	陈兴,杨港. 免喷涂材料在汽车行业上的应用与研究[J]. 南方农机, 2019(6): 160.
	CHEN X, YANG G.Application and Research of Non‑spraying Materials in Automobile Industry[J]. Southern Agricultural Machinery, 2019(6): 160.
12	保罗 D R,巴克纳尔 C B. 聚合物共混物: 组成与性能[M]. (殷敬华,韩艳春,安立佳等,译.) 北京: 科学出版社，2004, 658‑680.
13	SANTOS I, PONTES A J, MARTINS C I. Optimization of Injection Molding Process of Polypropylene with Aluminum Metallic Pigments[C]//PMI 2014‑International Conference on Polymersand Moulds Innovations. Conneticut: Society of Plastics Engineers, 2014.151‑156.
14	MARTINS C I, SANTOS I, PONTES A J. On the Effect of Metallic Particles on the Performance of Injection Moulded PP Plastic Parts[C]//5th Conference on Polymer and Mold Innovations. Conneticut: Society of Plastics Engineers, 2012. 375‑382.
15	莫荣强,雷春堂. 家电壳体用高分子材料及其应用技术的发展趋势[J]. 塑料工业, 2019, 47(2): 6‑10.
	MO R Q, LEI C T. Development Trend of PolymerMaterials and Application for Household Appliances Shell[J]. China Plastics Industry, 2019, 47(2): 6‑10.
16	MALGUARNERA S C, MANISALI A I, RIGGS D C. Weld Line Structures and Properties in Injection Molded Polypropylene[J]. Polymer Engineering and Science, 1981, 21(17): 1 149‑1 155.
17	CHEN S C, LI H M, SU P L, et al. Investigation of the Weldline Strength of Injection Molded Nylon 6 Nanocomposite[J]. Journal of Reinforced Plastics and Composites, 2009, 28(18): 2 197‑2 210.
18	CHUNG D H, KWON T H. Numerical Studies of Fiber Suspensions in an Axisymmetric Radial Diverging Flow: The Effects of Modeling and Numerical Assumptions[J]. Journal of Non‑Newtonian Fluid Mechanics, 2002, 107(1‑3): 67‑96.
19	PARK J M, KWON T H. Nonisothermal Transient Fil⁃ling Simulation of Fiber Suspended Viscoelastic Liquid in a Center‑Gated Disk[J]. Polymer Composites, 2011, 32(3): 427‑437.
20	FOLGAR F, TUCKER C L. Orientation Behavior of Fibers in Concentrated Suspensions[J]. Journal of Reinforced Plastics and Composites, 1984, 3(2):98‑119.
21	WANG J, O’GARA J F, TUCKER C L. An Objective Model for Slow Orientation Kinetics in Concentrated Fiber Suspensions: Theory and Rheological Evidence[J]. Journal of Rheology, 2008, 52(5): 1 179‑1 200.
22	BAY R S, TUCKER C L. Fiber Orientation in Simple Injection Moldings. Part I: Theory and Numerical Methods[J]. Polymer Composites, 1992, 13(4): 317‑331.
23	ADVANI S G. The Use Tensors to Describe and Predict Fiber Orientation in Short Fiber Composites[J]. Journal of Rheology, 1987, 31(8): 751‑784.
24	BAY R S, TUCKER C L. Fiber Orientation in Simple Injection Moldings. Part II: Experimental Results[J]. Polymer Composites, 1992, 13(4): 332‑341.
25	PHELPS J H, TUCKER C L. An Anisotropic Rotary Diffusion Model for Fiber Orientation in Short‑andLong‑Fiber Thermoplastics[J]. Journal of Non‑Newtonian Fluid Mechanics, 2009, 156(3): 165‑176.
26	GUPTA M, WANG K K. Fiber Orientation and Mechanical Properties of Short‑Fiber‑Reinforced Injection‑Molded Composites:Simulated and Experimental Results[J]. Polymer Composites, 1993, 14(5): 367‑382.
27	PARK J M, JEONG S J, PARK S J. Flake Orientation in Injection Molding of Pigmented Thermoplastics[J]. Journal of Manufacturing Science and Engineering Transactions of the Asme, 2012, 134(1): 014501‑1‑014501-4.
28	PARK S H, LYU M Y. Observation of Two‑Dimensional Shaped Aluminum Flake Orientation During Injection Molding and Its Orientation Mechanism[J].Macromolecular Research, 2019, 27(5): 481‑489.
29	董建廷,叶倩,逯琪. 多面体金属效果颜料的制备与应用[J]. 中国塑料, 2018, 32(8): 58‑64.
	DONG J T, YE Q, LU Q. Preparation and Applications of Polyhedral Pigments with Metallic Effect[J]. China Plastics, 2018, 32(8): 58‑64.
30	LIU H, YE H Q, TANG X D. Aluminum Pigment Encapsulated by in Situ Copolymerization of Styrene and Maleic Acid[J]. Applied Surface Science, 2007, 254(2): 616‑620.
31	KARLSSON P M, ESBJORNSSON N B, HOLMBERG K. Admicellar Polymerization of Methyl Methacrylate on Aluminum Pigments[J]. Journal of Colloid and Interface Science, 2009, 337(2): 364‑368.
32	MULLER B, PAULUS A, LETTMANN B, et al. Amphiphilic Maleic Acid Copolymers as Corrosion Inhibitors for Aluminum Pigment[J]. Journal of Applied Polymer Science, 1998, 69(11): 2 169‑2 174.
33	陆伟明. 急冷急热成型技术在花洒高光面板模具上的应用[J]. 模具工业, 2010, 36(10): 59‑62.
	LU W M. Application of Emergency Cooling and Heating Technique in Mould for High Surface Fineness of Shower Spray[J]. Die Industry, 2010, 36(10): 59‑62.
34	RAWSON K W, ALLAN P S, BEVIS M J. Controlled Orientation of Reflective Pigment and Optical Property Characterization of Injection‑Molded Polypropylene[J]. Polymer Engineering and Science, 2010, 39(1): 177‑189.
35	王茂玲,张荣语,许嘉翔. 模流分析理论与实务[M]. 初版. 新竹: 科盛科技股份有限公司, 2018. 59‑61.
36	刘芬,周华民,李德群. 注射成形残余应力与翘曲变形的数值模拟[J]. 上海交通大学报, 2008, 42(1): 61‑66.
	LIU F, ZHOU H M, LI D Q. The Numerical Simulation of Residual Stresses and Warpage in Injection Molding[J]. Journal of Shanghai Jiaotong University, 2008, 42(1): 61‑66.
37	PARK J M, JEONG S J, PARK S J. Numerical Prediction of Flake Orientation and Surface Color in Injection Molding of Flake‐Pigmented Thermoplastics[J]. Polymer Composites, 2011, 32(8): 1297‑1303.
38	KIM S L, CHOI T G, CHO H S, et al. Orientationof Two Dimensional Fillers and Surface Appearance in an Injection Molded Article[J]. Polymer‑Korea,2016,40(6): 871‑879.
39	朱海燕,肖小亭,张婧婧,等. ABS/铝粉共混物注塑件翘曲变形的模拟分析[J]. 工程塑料应用, 2010, 38(11): 35‑38.
	ZHU H Y, XIAO X T, ZHANG J J, et al. Numerical Analysis on Warpage of ABS/Aluminium Blends in Injection Moulding[J]. Engineering Plastics Application, 2010, 38(11): 35‑38.
40	徐东东. 基于Moldflow的免喷涂塑料在电水壶外壳上的仿真研究[J]. 塑料工业, 2017, 45(12): 63‑66.
	XU D D. Simulation Study of Free‑painting Plastic on Kettle Shell Base on Moldflow[J]. China Plastics
	Industry, 2017, 45(12): 63‑66.
41	张舒宁,刘洁,彭莉,等. 免喷涂聚丙烯材料耐光老化的影响因素研究[J]. 中国塑料, 2017, 31(10): 105‑112.
	ZHANG S N, LIU J, PENG L, et al. Research on Factors Influencing Photo‑aging of Polypropylene Materials[J]. China Plastics, 2017, 31(10): 105‑112.
42	刘鑫,曾文波,张晓东,等. 免喷涂聚丙烯复合材料耐候性研究[J]. 合成材料老化与应用, 2017, 46(3): 15‑19.
	LIU X, ZENG W B, ZAHNG X D, et al. The Aging Behavior of Spray‑free Polypropylene Composites[J]. Aging and Application of Synthetic Materials, 2017, 46(3): 15‑19.
43	胡纲. 免喷涂ABS的性能研究[J]. 塑料工业, 2015, 43(9): 117‑120.
	HU G. Study on Mechanical Properties of Free‑painting ABS[J]. China Plastics Industry, 2015, 43(9): 117‑120.
44	洪新密,肖小亭,廖俊. 金属效应ABS/AL注射件的反射率、颜色与力学性能[J]. 塑料, 2017, 46(6): 42‑45.
	HONG X M, XIAO X T, LIAO J. Reflectivity, Color and Mechanical Properties of Metallic Effect ABS/Al Plastic Parts[J]. Plastics, 2017, 46(6): 42‑45.

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