共查询到19条相似文献,搜索用时 109 毫秒
1.
BOPP专用料的生产开发 总被引:2,自引:1,他引:2
介绍了聚丙烯双向拉薄膜(BOPP)专用料T46F-M的生产工艺和BOPP的发展现状,分析了BOPP专用料性能上存在的问题,并提出了相应的解决办法。 相似文献
2.
BOPP料的结晶行为与高温拉伸试样的熔融特性 总被引:1,自引:0,他引:1
采用示差扫描量热仪(DSC)研究了双向拉伸聚丙烯薄膜专用料PD382的非等温结晶特性与不同的高温热拉伸比试样的熔融特性。结果表明:PD382在冷却结晶过程中,受到冷却速率相当大的影响,降温速率增加,材料的开始结晶温度和最大结晶温度降低,结晶能力提高,结晶速率加快;经过拉伸作用的试样的结晶结构趋于规整,有序,结晶结构中的缺陷减少,当拉伸比达到200%时,试样的结晶结构已经完成了从较为无序到有序规整状态的转变,进一步提高拉伸比则只是强化这种有序规整的结构。 相似文献
3.
4.
5.
6.
茂名BOPP专用料的生产与应用 总被引:11,自引:0,他引:11
介绍我国双闰伸聚丙烯(BOPP)原料生产及加工行业的现状,明确了BOPP原料市场的开发方向。根据目前原料在加工过程中存在的质量问题。结合上下游生产工艺特点,有针对性地设计原料生产过程控制方案。乎批试生产的BOPP料T36F,经加工厂家应用,产品质量达到国内先进水平。 相似文献
7.
8.
BOPP专用料结构表征及性能研究 总被引:7,自引:0,他引:7
探讨了BOPP专用料的物理性能,微观结构及流变性能对BOPP加工性能及制品性能的影响,从而确定了BOPP专用料性能指标的控制范围。 相似文献
9.
10.
阐述了BOPP专用料T38F的开发及试用过程,分析了T38F的加工稳定性,等规指数等对BOPP膜成膜过程的影响和解决过程,表明T38F的成功开发与应用。 相似文献
11.
12.
以聚丙烯(PP)粉料为基础原料,添加过氧化物生产无纺布专用PP树脂.研究发现:以熔体流动速率(MFR)为3.5~4.0 g/10 min的PP粉料为原料,使用固体过氧化物,生产MFR为40.0~50.0 g/10 min的无纺布专用PP树脂,生产过程平稳,产品质量能够满足要求.过氧化物的不同相态影响其在PP粉料中分散的均匀性,从而影响挤出造粒的稳定运行. 相似文献
13.
14.
In processes, such as melt spinning, the crystallization behavior of syndiotactic polypropylene (sPP) is found to be substantially different from that of most other linear polymers. The anisotropic stress field in such processes leads invariably to extension as well as alignment (orientation) of the chains in the melt, both of which contribute usually to dramatic enhancement in the rate of crystallization. However, since the primary structure of the sPP chain in its most preferred crystal form is comprised of a “coiled helical,” ? (T2G2)2? , sequence, stress‐induced chain extension can lead to conformational sequences that are not favorable for crystallization in this form. As a consequence, process conditions that generate higher stress levels can cause a diminution in the rate of crystallization of this polymer. Such conformation‐related aspects of oriented crystallization of sPP have been addressed through an analysis of the structure and properties of melt‐spun fibers, produced over a range of spinning speeds. The results serve to identify a refinement that is needed in current models of oriented crystallization and also a mechanism to promote the nucleation of crystallization of sPP. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 2305–2317, 2001 相似文献
15.
16.
17.
The influence of a nonpigmenting β‐nucleating additive in the crystallization of isotactic polypropylene (iPP) is investigated by differential scanning calorimetry and X‐ray diffraction. It is found that this additive induces the formation of a very high level of the trigonal modification of iPP. The crystallization and melting behavior of the nucleated systems are studied as a function of the cooling and heating rates and the control of the final temperature during the cooling process. The nucleating agent exerts an important effect on the crystallization temperatures and the polymorphic transitions of iPP, delaying the β–α recrystallization process through an increase in the stability of the trigonal crystals. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 531–539, 2002 相似文献
18.
PVF型高速贴标胶粘剂的研制 总被引:32,自引:12,他引:20
介绍了一种改性的聚乙烯醇缩甲醛(PVF)胶粘剂的制备方法,该胶适用于啤酒生产线上的高速贴标(车速达24000~28000只/小时),它具有游离甲醛量较低,好的粘度稳定性和低温贮存稳定性等优点。 相似文献