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专家讲座 洪慎章·塑料压制成型

Compression molding technology and mold design
—— Part I Plastic press molding
Lecture 1 Introduction (2)Ḥ
ḤḤḤ
Hong Shenzhang
(Shanghai Jiaotong University of Plastic Forming Technology and Equipment Institute, Shanghai 200030,China)

Abstract: Compression and injection molding use different types of plastics, the former using thermosetting
plastics, the latter using thermoplastic plastics. Compression molding technology and mold design is
a developing comprehensive science. It not only improves with the improvement of polymer synthesis
technology, the renewal of molding equipment and the maturity of molding technology, but also with the
development of computer technology, rapid molding technology, numerical simulation technology, digital
application technology, intelligent technology, etc. The main contents of this lecture include: compressing
molding technology and classification, compressing molding parts design, compressing mold structure design
and parts design, compressing molding equipment, quality control and defect analysis of compressing
molded parts, application examples of compressing molds, principle and process of injection-compression
molding, structure design of injection-compression mold, calculation of injection-compression molding
pressure, selection of injection-compression molding equipment, quality and defect analysis of injection-
compression molded parts, application examples of injection-compression molds.
Key words: design and forming of compression molded part; compression molding technology and mold
structure design; compressing molding equipment; quality and defect of compressing molded part; selection
of injection-compression molding technology and equipment; structure design of injection-compression mold;
quality and defect analysis of injection-compression molded part
（未完待续）
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印度发明一种环保的塑料降解方法
India invented an environmental-friendly plastic degradation method
印度研究人员最新发明了一种环保的塑料降解方法，只需要将塑料放在含有葡萄糖和金属离子的 70℃溶液中，
连续搅拌数天，就可将塑料降解成分子。
印度理工学院马德拉斯分校研究人员领衔的团队发现，新方法可用于降解聚四氟乙烯等塑料材料。相关研究
论文已发表在美国化学学会期刊《可持续化学与工程》上。
聚四氟乙烯是一种具有耐热性、化学惰性、绝缘稳定性和低摩擦性的高性能材料。研究人员首先把一个涂有
聚四氟乙烯的磁性搅拌器，放进 70℃溶液中连续搅拌 15 天，溶液中里含有金属离子和 1000×10 -6 的葡萄糖。
研究人员随后在溶液表面发现漂浮着带有亮红色发光的微小碎片。结果证明，这些明亮的微小粒子中含有聚
四氟乙烯聚合物的分子碎片。
研究还发现，在没有搅拌、葡萄糖或金属离子情况下，聚四氟乙烯没有出现这种降解现象 ; 在室温下，降解
速率则降低 ; 随着溶液中葡萄糖含量增加，对聚四氟乙烯的降解作用会增强。
研究人员解释说，聚四氟乙烯可能通过连续搅拌时的摩擦电降解为分子。他们提醒说，由于许多现代炊具上
都涂有聚四氟乙烯，类似的化学反应也可能会发生在炊具上，导致食物中含有微塑料。同样，这种摩擦电降解过
程也可能发生在海洋中，那里有大量的金属离子，波浪提供持续搅动，因此可能成为海洋微塑料产生的途径之一。
摘编自 “ 新华网 ”
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2019 第 45 卷 ·9·
年