Nowadays, stone plastic elevator door covers are becoming increasingly popular. Some people say that the base material of stone plastic elevator door covers is brittle, but what is the reason for this? Below, the editor will provide a detailed introduction to the root cause of substrate brittleness, as well as the unreasonable mixing process and formula.

1、填料过多。

1. Excessive filling.

由于目前市场上石塑电梯门套的低，原材料又在上涨，很多石塑电梯门套厂家都在降低成本上着手。而正规的石塑电梯门套厂家都是在不降低质量的前提下，通过配方的优化组合降低了成本;有些厂家却在降低成本的同时也降低了制品质量。

Due to the low prices of stone plastic elevator door covers in the current market and the rising prices of raw materials, many stone plastic elevator door cover manufacturers are starting to reduce costs. And legitimate stone plastic elevator door cover manufacturers have reduced costs through optimized combinations of formulas without compromising quality; Some manufacturers have reduced costs while also reducing product quality.

2、抗冲击改性剂的数量及添加种类。

2. The quantity and type of impact modifier added.

在应力作用下，抗冲击改性剂能够提高聚氯乙烯破裂的总能量。目前，CPE、ACR、MBS、 abs、EVA等是硬质聚氯乙烯的抗冲击改性剂的主要品种，其中CPE、EVA、ACR改性剂的分子结构中不含双键，耐候性能好，适宜做户外建筑材料，它们与PVC共混，能有效的提高硬聚氯乙烯的抗冲击性能、加工性、耐候性及在一定范围内提高焊角强度。

Under stress, impact modifiers can increase the total energy of PVC cracking. At present, CPE, ACR, MBS, ABS, EVA, etc. are the main types of impact modifiers for hard polyvinyl chloride. The molecular structure of CPE, EVA, ACR modifiers does not contain double bonds, and they have good weather resistance. They are suitable for outdoor building materials. When mixed with PVC, they can effectively improve the impact resistance, processability, weather resistance of hard polyvinyl chloride and improve the welding corner strength within a certain range.

3、稳定剂过多或过少。

3. Excessive or insufficient stabilizer.

稳定剂的作用是抑制降解，或与释放出的氯化氢反应以及防止聚氯乙烯加工时变色。稳定剂用量多少也会对型材的抗冲击强度造成影响，过多或过少都会造成型材强度降低引起型材发脆现象。

The function of stabilizers is to inhibit degradation, react with the released hydrogen chloride, and prevent discoloration during PVC processing. The amount of stabilizer used can also have an impact on the impact strength of the profile, and too much or too little can cause a decrease in the strength of the profile and cause it to become brittle.

4、外润滑剂用量过多。

4. Excessive amount of external lubricant used.

外润滑剂与树脂相溶性较低，能够促进树脂粒子间的滑动，从而减少摩擦热量并推迟熔化过程，润滑剂的这种作用在加工过程早期(也就是在外部加热作用和内部产生的摩擦热使树脂完全熔化和熔体中树脂失去识别特征之前)是的。

External lubricants have low solubility with resin and can promote the sliding between resin particles, thereby reducing frictional heat and delaying the melting process. This effect of lubricants is greatest in the early stages of the processing process (i.e., before the external heating and internal frictional heat cause the resin to completely melt and the resin in the melt loses its recognition characteristics).

5、热混加料顺序，温度设值以及熟化时间对型材的性能也有决定性的因素。

5. The sequence of hot mix feeding, temperature setting, and curing time also have decisive factors on the performance of the profile.

PVC-U配方的组分很多，所选择加料顺序应有利于发挥每种助剂的作用，并有利于提高分散速度，而避免其不良的协同效应，助剂的加料顺序应有助于提高助剂的相辅相成效果，克服相克相消的作用，使用在PVC树脂中分散的助剂，充分进入PVC树脂内部。

There are many components in the PVC-U formula, and the selected feeding sequence should be conducive to exerting the role of each auxiliary agent and improving the dispersion speed, while avoiding its adverse synergistic effects. The feeding sequence of auxiliary agents should help improve the complementary effect of auxiliary agents, overcome the role of mutual exclusion, and use auxiliary agents dispersed in PVC resin to fully enter the interior of PVC resin.

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