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、填料過多。

1. Excessive filling.

由于目前市場上石塑電梯門套的低，原材料又在上漲，很多石塑電梯門套廠家都在降低成本上著手。而正規的石塑電梯門套廠家都是在不降低質量的前提下，通過配方的優化組合降低了成本;有些廠家卻在降低成本的同時也降低了制品質量。

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、抗沖擊改性劑的數量及添加種類。

2. The quantity and type of impact modifier added.

在應力作用下，抗沖擊改性劑能夠提高聚氯乙烯破裂的總能量。目前，CPE、ACR、MBS、 abs、EVA等是硬質聚氯乙烯的抗沖擊改性劑的主要品種，其中CPE、EVA、ACR改性劑的分子結構中不含雙鍵，耐候性能好，適宜做戶外建筑材料，它們與PVC共混，能有效的提高硬聚氯乙烯的抗沖擊性能、加工性、耐候性及在一定范圍內提高焊角強度。

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、穩定劑過多或過少。

3. Excessive or insufficient stabilizer.

穩定劑的作用是抑制降解，或與釋放出的氯化氫反應以及防止聚氯乙烯加工時變色。穩定劑用量多少也會對型材的抗沖擊強度造成影響，過多或過少都會造成型材強度降低引起型材發脆現象。

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、外潤滑劑用量過多。

4. Excessive amount of external lubricant used.

外潤滑劑與樹脂相溶性較低，能夠促進樹脂粒子間的滑動，從而減少摩擦熱量并推遲熔化過程，潤滑劑的這種作用在加工過程早期(也就是在外部加熱作用和內部產生的摩擦熱使樹脂完全熔化和熔體中樹脂失去識別特征之前)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、熱混加料順序，溫度設值以及熟化時間對型材的性能也有決定性的因素。

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

PVC-U配方的組分很多，所選擇加料順序應有利于發揮每種助劑的作用，并有利于提高分散速度，而避免其不良的協同效應，助劑的加料順序應有助于提高助劑的相輔相成效果，克服相克相消的作用，使用在PVC樹脂中分散的助劑，充分進入PVC樹脂內部。

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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