CN106432789A - 一种废旧交联聚对苯二甲酸二烯丙酯的回收工艺 - Google Patents
一种废旧交联聚对苯二甲酸二烯丙酯的回收工艺 Download PDFInfo
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Abstract
本发明涉及一种废旧交联聚对苯二甲酸二烯丙酯的回收工艺,步骤如下:步骤1)废旧交联聚对苯二甲酸二烯丙酯的预处理:将废旧交联聚对苯二甲酸二烯丙酯进行表面喷淋清洗和紫外线杀菌;步骤2)废旧交联聚对苯二甲酸二烯丙酯的解聚回收:将步骤1)处理后的废旧交联聚对苯二甲酸二烯丙酯经粉碎后,加入挤出机,在高温和交变剪切作用下,使得交联聚对苯二甲酸二烯丙酯的分子链发生解聚,实现回收利用。本发明的有益效果是:可以环保高效地解聚交联聚对苯二甲酸二烯丙酯,使得解聚后的聚对苯二甲酸二烯丙酯具有高温流动性和可加工性,直接应用于下游的制品生产,解决传统处理方法的污染和低效率问题。
Description
技术领域
本发明涉及资源的回收利用领域,具体的涉及一种废旧交联聚对苯二甲酸二烯丙酯的回收工艺。
背景技术
交联聚对苯二甲酸二烯丙酯的难回收,正是由于其分子链发生交联,形成了立体网状结构。很自然,要实现交联聚对苯二甲酸二烯丙酯的回收,破坏其立体网状结构,使分子链间的交联结构发生解聚断键,就可实现交联聚对苯二甲酸二烯丙酯的回收。
化学键的破坏有两种方法,即化学方法和物理方法。化学方法是利用化学助剂,如有机二硫化物、硫醇、碱金属等,在高温下,通过这些助剂对交联键进行进攻破坏,使得交联键断开,同时这些物质还能把断开的活性链端进行惰性端封,避免破坏的交联键再次交联,这样交联聚对苯二甲酸二烯丙酯就解聚成非交联聚对苯二甲酸二烯丙酯,具有可流动性和加工性,可以象热塑性聚对苯二甲酸二烯丙酯一样回收利用。化学方法需要加入化学助剂,成本提高,并且在解聚过程中,会产生大量的腐蚀性或有毒气体,容易引起二次污染,因此化学方法并不是一种环保有效的方法。
物理方法是不加入化学物质,只是利用外加能量,使交联聚对苯二甲酸二烯丙酯的立体网络结构破坏,形成线型直链或支链型的低相对分子量的二维结构这样材料具有高温流动性和可加工性而得以再生利用。目前常用的是微波或超声波的方法,虽然物理方法由于没有化学物质的加入,不会引起二次污染,相对环保,但这些方法的设备投资大,很难实现连续化生产,因此 效率很低,在大规模工业化生产领域很难实现,大多停留在实验室阶段。
针对现有的回收交联聚对苯二甲酸二烯丙酯废弃物方法所面临的问题,需要研究高效无二次污染的新的回收处理方法。
发明内容
本发明所要解决的技术问题是提供一种废旧交联聚对苯二甲酸二烯丙酯的回收工艺。
本发明解决上述技术问题的技术方案如下:一种废旧交联聚对苯二甲酸二烯丙酯的回收工艺,步骤如下:
步骤1)废旧交联聚对苯二甲酸二烯丙酯的预处理:将废旧交联聚对苯二甲酸二烯丙酯进行表面喷淋清洗和紫外线杀菌;
步骤2)废旧交联聚对苯二甲酸二烯丙酯的解聚回收:将步骤1)处理后的废旧交联聚对苯二甲酸二烯丙酯经粉碎后,加入挤出机,在高温和交变剪切作用下,使得交联聚对苯二甲酸二烯丙酯的分子链发生解聚,实现回收利用。
本发明的有益效果是:可以环保高效地解聚交联聚对苯二甲酸二烯丙酯,使得解聚后的聚对苯二甲酸二烯丙酯具有高温流动性和可加工性,直接应用于下游的制品生产,解决传统处理方法的污染和低效率问题。
在上述技术方案的基础上,本发明还可以做如下改进:
进一步,所述挤出机的挤出温度为240~300℃;所述物料的处理时间为30-60s;
所述的挤出机为单螺杆挤出机或双螺杆挤出机;所述挤出机螺杆的长径比为56~80,螺杆转速为400~1200rpm,使得物料承受的剪切线速度为4-8m/s;所述挤出机的螺杆组合保持剪切力的交变周期为2~10个。
进一步,所述的挤出机为同向双螺杆挤出机。
进一步,所述的废旧交联聚对苯二甲酸二烯丙酯粉碎至粒径为0.5-1cm的颗粒。
进一步,所述挤出机的挤出温度为275~285℃,模头压力为12~18MPa。
进一步,所述挤出机螺杆的长径比为52~60,螺杆转速为800~1000rpm。
进一步,所述挤出机的螺杆组合保持剪切力的交变周期为5~8个。
具体实施方式
以下对本发明的原理和特征进行描述,所举实例只用于解释本发明,并非用于限定本发明的范围。
实施例1
本发明解决上述技术问题的技术方案如下:一种废旧交联聚对苯二甲酸二烯丙酯的回收工艺,步骤如下:
步骤1)废旧交联聚对苯二甲酸二烯丙酯的预处理:将废旧交联聚对苯二甲酸二烯丙酯进行表面喷淋清洗和紫外线杀菌;
步骤2)废旧交联聚对苯二甲酸二烯丙酯的解聚回收:将步骤1)处理后的废旧交联聚对苯二甲酸二烯丙酯经粉碎后,加入挤出机,在高温和交变剪切作用下,使得交联聚对苯二甲酸二烯丙酯的分子链发生解聚,实现回收利用。
本发明的有益效果是:可以环保高效地解聚交联聚对苯二甲酸二烯丙酯,使得解聚后的聚对苯二甲酸二烯丙酯具有高温流动性和可加工性,直接应用于下游的制品生产,解决传统处理方法的污染和低效率问题。
在上述技术方案的基础上,本发明还可以做如下改进。
进一步,所述挤出机的挤出温度为240℃;所述物料的处理时间为30s;
所述的挤出机为同向双螺杆挤出机;所述挤出机螺杆的长径比为56,螺杆转速为400rpm,模头压力为128MPa,使得物料承受的剪切线速度为4m/s;所述挤出机的螺杆组合保持剪切力的交变周期为2个。
进一步,所述的废旧交联聚对苯二甲酸二烯丙酯粉碎至粒径为0.5cm的颗粒。
实施例2
本发明解决上述技术问题的技术方案如下:一种废旧交联聚对苯二甲酸二烯丙酯的回收工艺,步骤如下:
步骤1)废旧交联聚对苯二甲酸二烯丙酯的预处理:将废旧交联聚对苯二甲酸二烯丙酯进行表面喷淋清洗和紫外线杀菌;
步骤2)废旧交联聚对苯二甲酸二烯丙酯的解聚回收:将步骤1)处理后的废旧交联聚对苯二甲酸二烯丙酯经粉碎后,加入挤出机,在高温和交变剪切作用下,使得交联聚对苯二甲酸二烯丙酯的分子链发生解聚,实现回收利用。
本发明的有益效果是:可以环保高效地解聚交联聚对苯二甲酸二烯丙酯,使得解聚后的聚对苯二甲酸二烯丙酯具有高温流动性和可加工性,直接应用于下游的制品生产,解决传统处理方法的污染和低效率问题。
在上述技术方案的基础上,本发明还可以做如下改进。
进一步,所述挤出机的挤出温度为300℃;所述物料的处理时间为60s;
所述的挤出机为单螺杆挤出机;所述挤出机螺杆的长径比为80,螺杆转速为1200rpm,使得物料承受的剪切线速度为8m/s,模头压力为18MPa;所述挤出机的螺杆组合保持剪切力的交变周期为10个。
进一步,所述的废旧交联聚对苯二甲酸二烯丙酯粉碎至粒径为1cm的颗粒。
实施例3
本发明解决上述技术问题的技术方案如下:一种废旧交联聚对苯二甲酸 二烯丙酯的回收工艺,步骤如下:
步骤1)废旧交联聚对苯二甲酸二烯丙酯的预处理:将废旧交联聚对苯二甲酸二烯丙酯进行表面喷淋清洗和紫外线杀菌;
步骤2)废旧交联聚对苯二甲酸二烯丙酯的解聚回收:将步骤1)处理后的废旧交联聚对苯二甲酸二烯丙酯经粉碎后,加入挤出机,在高温和交变剪切作用下,使得交联聚对苯二甲酸二烯丙酯的分子链发生解聚,实现回收利用。
本发明的有益效果是:可以环保高效地解聚交联聚对苯二甲酸二烯丙酯,使得解聚后的聚对苯二甲酸二烯丙酯具有高温流动性和可加工性,直接应用于下游的制品生产,解决传统处理方法的污染和低效率问题。
在上述技术方案的基础上,本发明还可以做如下改进。
进一步,所述挤出机的挤出温度为275℃;所述物料的处理时间为45s;
所述的挤出机为双螺杆挤出机;所述挤出机螺杆的长径比为56,螺杆转速为800rpm,模头压力为12MPa使得物料承受的剪切线速度为6m/s;所述挤出机的螺杆组合保持剪切力的交变周期为5个。
进一步,所述的废旧交联聚对苯二甲酸二烯丙酯粉碎至粒径为0.8cm的颗粒。
实施例4
本发明解决上述技术问题的技术方案如下:一种废旧交联聚对苯二甲酸二烯丙酯的回收工艺,步骤如下:
步骤1)废旧交联聚对苯二甲酸二烯丙酯的预处理:将废旧交联聚对苯二甲酸二烯丙酯进行表面喷淋清洗和紫外线杀菌;
步骤2)废旧交联聚对苯二甲酸二烯丙酯的解聚回收:将步骤1)处理后的废旧交联聚对苯二甲酸二烯丙酯经粉碎后,加入挤出机,在高温和交变剪 切作用下,使得交联聚对苯二甲酸二烯丙酯的分子链发生解聚,实现回收利用。
本发明的有益效果是:可以环保高效地解聚交联聚对苯二甲酸二烯丙酯,使得解聚后的聚对苯二甲酸二烯丙酯具有高温流动性和可加工性,直接应用于下游的制品生产,解决传统处理方法的污染和低效率问题。
在上述技术方案的基础上,本发明还可以做如下改进。
进一步,所述挤出机的挤出温度为285℃;所述物料的处理时间为50s;
所述的挤出机为单螺杆挤出机或双螺杆挤出机;所述挤出机螺杆的长径比为60,螺杆转速为1000rpm,使得物料承受的剪切线速度为5m/s,模头压力为15MPa;所述挤出机的螺杆组合保持剪切力的交变周期为8个。
进一步,所述的废旧交联聚对苯二甲酸二烯丙酯粉碎至粒径为0.7cm的颗粒。
对比例1
物料、设备和加工工艺与实施例1相同,螺杆转速设置为300rpm。交联聚对苯二甲酸二烯丙酯不能通过双螺杆挤出机造粒,物料的性能参数见表1。
表1实施例1-4及对比例1中的物料的性能参数
以上所述仅为本发明的较佳实施例,并不用以限制本发明,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (7)
1.一种废旧交联聚对苯二甲酸二烯丙酯的回收工艺,其特征在于,步骤如下:
步骤1)废旧交联聚对苯二甲酸二烯丙酯的预处理:将废旧交联聚对苯二甲酸二烯丙酯进行表面喷淋清洗和紫外线杀菌;
步骤2)废旧交联聚对苯二甲酸二烯丙酯的解聚回收:将步骤1)处理后的废旧交联聚对苯二甲酸二烯丙酯经粉碎后,加入挤出机,在高温和交变剪切作用下,使得交联聚对苯二甲酸二烯丙酯的分子链发生解聚,实现回收利用。
2.根据权利要求1所述的废旧交联聚对苯二甲酸二烯丙酯的回收工艺,其特征在于,
所述挤出机的挤出温度为240~300℃;
所述物料的处理时间为30-60s;
所述的挤出机为单螺杆挤出机或双螺杆挤出机;
所述挤出机螺杆的长径比为52~80,螺杆转速为400~1200rpm,使得物料承受的剪切线速度为4-8m/s;
所述挤出机的螺杆组合保持剪切力的交变周期为2~10个。
3.根据权利要求1所述的废旧交联聚对苯二甲酸二烯丙酯的回收工艺,其特征在于,所述的挤出机为同向双螺杆挤出机。
4.根据权利要求1所述的废旧交联聚对苯二甲酸二烯丙酯的回收工艺,其特征在于,所述的废旧交联聚对苯二甲酸二烯丙酯粉碎至粒径为0.5-1cm的颗粒。
5.根据权利要求2或3所述的废旧交联聚对苯二甲酸二烯丙酯的回收工艺,其特征在于,所述挤出机的挤出温度为275~285℃,模头压力为12~18MPa。
6.根据权利要求5所述的废旧交联聚对苯二甲酸二烯丙酯的回收工艺,其特征在于,所述挤出机螺杆的长径比为56~60,螺杆转速为800~1000rpm。
7.根据权利要求6所述的废旧交联聚对苯二甲酸二烯丙酯的回收工艺,其特征在于,所述挤出机的螺杆组合保持剪切力的交变周期为5~8个。
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