2024年4月10日发(作者：)

Technical Bulletin

Result:

1. Cell Size

EPS produced with no nucleant had an average cell size of 100 microns

(although with irregularly shaped cells).The addition POLYWAX 1000 Polyethylene

reduced the average cell size to 82 microns,while improving the regularity and

appearance of the X 2000 Polyethylene increased the average cell size

to 97 microns. The use of POLYWAX 3000 Polyethylene further increased the

average cell size to 146 microns.

没有成核剂生产的EPS具有100微米的平均泡孔尺寸（但是颗粒形状不规则）。添加了

聚乙烯蜡POLYWAX 1000可将平均泡孔大小减小为82微米，同时提高了颗粒的规律性和

外观。聚乙烯蜡POLYWAX2000增加气泡平均大小为97微米。利用聚乙烯蜡

POLYWAX3000则进一步增加了平均气泡大小为146微米。

2. Cell Structure

The photos shown below are of EPS beads,taken with a scanning electron

microscope, at 50X the differences in cell size between the

grade of POLYWAX Polyethylene as well as the more uniform cell development

when POLYWAX Polyethylene are used as a nucleant.

如下所示的照片是EPS泡粒，用电子显微镜扫描拍摄，放大50倍的图像。注意用不同

等级的聚乙烯蜡后泡粒尺寸存在的差异以及用聚乙烯蜡作成核剂后颗粒更均匀的分布。

Additives for Large Cell Expandable Polystylene

Benefits of POLYWAX 3000 Polyethylene

Conclusion：

Expandable Polystyrene (EPS) cell size can be influenced by the choice of

nucleating agent .In this study , POLYWAX 3000 Polyethylene is shown to produce

the largest cell size.

可发性聚苯乙烯（EPS）的颗粒大小会受成核剂的影响，在这项研究中，聚乙烯蜡3000

被视为可产生最大的颗粒。

Background Information:

In some regions of the world，standards to regulate thermal properties of

insulation grade EPS are being uently,producers are searching

for ways to meet these new regulations while still maintaining a good balance of

properties in the final product.

在世界上的一些地区，可发性聚苯乙烯的绝热性能被认为应当用标准来规范，所以，生

产者正在寻找方法来满足这些新规定，同时仍保持其特性在最终产品的良好平衡。

One way to affect thermal properties is to control cell foam is an

effective insulating material because still air transmits less heat than does

polystyrene .While decreasing foam density can reduce heat transmission,lower

density foam can also suffer from inferior mechanical properties.

影响导热性能的一种方式是控制泡粒的大小，EPS泡沫是一种有效的绝热材料，因为热

量在空气中的传递比聚苯乙烯中的传递少。但是在降低泡沫密度可以减少热量传递的同时，

由于较低密度的泡沫也容易收到机械损坏。

Increasing EPS cell size is one approach to reducing heat transmission a good

balance of cell EPS can provide a higher ratio of trapped air to cell

wall surface area and improve insulating performance ,up to a cell size at which

convective heat transmittance becomes a significant factor,If the cell size is

increased to a point at which active air circulation begins within cells,.

增大EPS的泡粒尺寸是减少热量传递的一种好的方法，较大的EPS泡粒会通过它的泡

粒表面提供一个较高的空气阻截率以提高它的绝热性能。小的泡粒则成为影响绝热性的显著

因子，如果这种泡粒的尺寸增大一个点，则空气就开始在泡粒内部循环，那么它的绝热性能

就会超出最佳平衡点开始下降。

Experimental Design:

EPS polymerization runs were made in Baker Petrolite’s 3-liter laboratory

reactor with three different grades of POLYWAX Polyethylene.A run with no

nucleant was made as a control.

EPS聚合试验是在贝克休斯的3升实验室反应器加入三种不同档次聚乙烯蜡完成，和

一个没有加入成核剂的实验做对照。