CN116535798A - 一种利用废旧塑胶跑道粉末改性橡胶的方法 - Google Patents
一种利用废旧塑胶跑道粉末改性橡胶的方法 Download PDFInfo
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Abstract
本发明公开了一种利用废旧塑胶跑道粉末改性橡胶的方法,首先对废旧塑胶跑道粉末进行改性,获得聚苯乙烯改性塑胶跑道粉末;然后聚苯乙烯改性塑胶跑道粉末与丁苯橡胶基体、4,4'‑双马来酰亚胺二苯甲烷按照特定顺序加入密炼机中,混炼得到废旧塑胶跑道粉末改性橡胶。本发明所制得改性橡胶具有自修复能力,相比于原始橡胶,其拉伸模量也得到了提升。同时,该技术利用废旧塑胶跑道粉末对橡胶进行改性,使废旧塑胶跑道得到充分利用,既节约了资源,又避免了由于丢弃废旧塑胶跑道而对环境造成污染。
Description
技术领域
本发明属于自修复橡胶技术领域,具体涉及一种利用废旧塑胶跑道粉末改性橡胶的方法。
背景技术
当前,随着经济的飞速发展,塑胶跑道因具有弹性好、维护简便等特点,被广泛应用于田径运动场的建设中。随着使用时间的增长,其耐磨性和弹性会逐渐下降,需要进行维修或更换。对于废旧塑胶跑道,传统的处理方法是焚烧或填埋,但这些处理方法并不符合绿色环保的要求。一方面废旧塑胶跑道焚烧过程中会产生有毒的烟气,如果填埋则其中的含塑化剂可能会渗入土壤和水体,对生态环境造成污染;另一方面,废旧的塑胶跑道通常是由聚氨酯橡胶、乙丙橡胶、氯丁橡胶等构成,如果不加以回收利用,是非常大的浪费。因此,出于环境保护和再生废旧资源的考虑,十分有必要对废旧的塑胶跑道进行妥善地回收利用。
发明内容
本发明针对现有技术的不足,提供了一种利用废旧塑胶跑道粉末改性橡胶的方法,在实现废旧塑胶跑道回收与再利用的同时,增强橡胶的力学性能,并赋予其自修复性能。本发明符合绿色可持续发展的理念,为废旧塑胶跑道的回收再利用开拓了新的思路。
本发明利用废旧塑胶跑道粉末改性橡胶的方法,包括如下步骤:
步骤1:对废旧塑胶跑道粉末进行改性,获得聚苯乙烯改性塑胶跑道粉末;
步骤2:将聚苯乙烯改性塑胶跑道粉末与丁苯橡胶基体、4,4'-双马来酰亚胺二苯甲烷按照特定顺序加入密炼机中,混炼得到废旧塑胶跑道粉末改性橡胶。
步骤1中,所述聚苯乙烯改性塑胶跑道粉末是由废旧塑胶跑道粉末分散在苯乙烯、二乙烯基苯和2-乙烯基呋喃中,溶胀、聚合后所制得聚苯乙烯改性塑胶跑道粉末,具体通过如下步骤制备获得:
1a、将废旧塑胶跑道粉碎,筛选获得直径≤0.5mm的粉末;
1b、将1a获得的废旧塑胶跑道粉末加入反应器中,随后加入苯乙烯(SM)、二乙烯基苯(DVB)和2-乙烯基呋喃,并加入偶氮二异丁腈(AIBN),完全浸没粉末后在室温下放置4-6h,使得废旧橡胶跑道粉末能够充分溶胀;
1c、将步骤1b溶胀后的废旧塑胶跑道粉末取出,分散到水中,并加入十二烷基苯磺酸钠(SDBS),在80℃下反应3-4h,冷却至室温后过滤得到聚苯乙烯改性塑胶跑道粉末。
进一步地,步骤1中各原料的添加量按质量份数为:废旧塑胶跑道粉末100份,苯乙烯100份,二乙烯基苯5-20份,2-乙烯基呋喃5-10份,偶氮二异丁腈0.5-2份,十二烷基苯磺酸钠1-5份,水500份。
为了使复合材料各组分混合均匀,步骤2中的加料顺序为:首先将橡胶基体与聚苯乙烯改性塑胶跑道粉末加入到密炼机中混炼一段时间,接着将4,4'-双马来酰亚胺二苯甲烷和2-乙烯基呋喃加入密炼机中混炼一段时间,最后加入交联剂DCP和防老剂D继续混炼,直至混炼均匀。
首先混炼橡胶基体与聚苯乙烯改性塑胶跑道粉末,使其物理混合均匀;其次,加入双马和乙烯基呋喃小分子,使其与橡胶和跑道粉末物理混合均匀;最后加入DCP引发乙烯基呋喃的双键与橡胶双键的反应。
步骤2中,各原料的添加量按质量份数为:聚苯乙烯改性塑胶跑道粉末100份,丁苯橡胶100-200份,4,4'-双马来酰亚胺二苯甲烷5-15份,2-乙烯基呋喃5份,交联剂DCP 1份,防老剂D1份。
进一步地,密炼机温度设定为80-100℃,丁苯橡胶基体与聚苯乙烯改性塑胶跑道粉末的混炼时间为2-6min,加入4,4'-双马来酰亚胺二苯甲烷后混合物的混炼时间为2-6min,加入DCP和防老剂D后的混炼时间为2-6min。
最后,将混炼后的橡胶置于合适内腔的模具中,升温到140℃,在10MPa压力作用下成型15min(在此过程中,呋喃与双马来酰亚胺会发生反应,形成可逆交联)。
本发明制备的改性橡胶具有自修复功能,在废旧塑胶跑道粉末与橡胶的界面上,能够通过呋喃和双马来酰亚胺形成可逆的相互作用(图1)。
与现有技术相比,本发明的有益效果体现在:
本发明利用废旧塑胶跑道粉末作为橡胶改性剂,既避免了由于焚烧或填埋废旧塑胶跑道而对环境造成的污染,又使废旧塑胶跑道能够得到充分的利用,节约了资源。同时,聚苯乙烯改性塑胶跑道粉末能够有效增强橡胶复合材料,提高其拉伸强度。通过在废旧塑胶跑道粉末与橡胶的界面上引入呋喃和双马来酰亚胺,能够形成可逆的相互作用,使改性橡胶复合材料具有自修复能力。
附图说明
图1是改性橡胶中改性塑胶跑道粉末与橡胶基体之间的可逆相互作用示意图。
图2是利用废旧塑胶跑道粉末改性橡胶流程图。
具体实施方式
以下结合具体的实施例对本发明技术方案作进一步说明,但所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
实施例1:
本实施例按如下步骤制备利用废旧塑胶跑道粉末改性橡胶复合材料:
1、将废旧橡胶跑道采用破碎机对其进行破碎处理,得到橡胶原料颗粒;将破碎得到的橡胶颗粒通过直径0.5mm的筛网进行筛分,得到废旧橡胶粉末。
2、在惰性气体N2的保护下,将20g废旧橡胶粉末、0.3g引发剂偶氮二异丁腈、20g苯乙烯溶剂、3g二乙烯基苯以及2g 2-乙烯基呋喃加入到放入容器中,在室温下放置4-6h,使得废旧橡胶跑道粉末能够充分溶胀。
3、将溶胀后的废旧塑胶跑道粉末取出,分散到100g水中,并加入0.6g十二烷基苯磺酸钠,在80℃下反应3-4h,待反应结束后冷却至室温,过滤。随后放入100℃的真空干燥箱干燥6h,得到聚苯乙烯改性塑胶跑道粉末。
4、将16g的丁苯橡胶加入到转速为100rpm、温度为90℃的密炼机中进行混炼,混炼时间6min;加入20g步骤3所得改性废旧塑胶跑道粉末,并将4g 4,4'-双马来酰亚胺二苯甲烷、4g 2-乙烯基呋喃,0.2gDCP、0.2g防老剂D预混合粉末依次加入密炼机中,继续混炼15min。
5、将密炼所得到的产品,在平板硫化仪上进行硫化,随后裁制成标准样条。加热温度为180℃、压力10MPa、硫化时间15min,制得利用废旧塑胶跑道粉末改性橡胶复合材料。
实施例2:
本实施例采用与实施例1相同的方法制备利用废旧塑胶跑道粉末改性橡胶复合材料,区别在于:将实施例1中的16g丁苯橡胶替换为20g丁苯橡胶。
实施例3:
本实施例采用与实施例1相同的方法制备利用废旧塑胶跑道粉末改性橡胶复合材料,区别在于:将实施例1中的3g4,4'-双马来酰亚胺二苯甲烷替换为6g4,4'-双马来酰亚胺二苯甲烷。
实施例4:
本实施例采用与实施例1相同的方法制备利用废旧塑胶跑道粉末改性橡胶复合材料,区别在于:将实施例1中的16g丁苯橡胶替换为40g丁苯橡胶。
以上所述仅为本发明的较佳实施例而已,并不用以限制本发明的专利范围,凡在本发明的精神和原则之内所做的任何修改、等同替换和改进等,均应包含在本发明的保护范围之内。对比例1:
本对比例采用与实施例1相同的方法制备利用废旧塑胶跑道粉末改性橡胶复合材料,区别在于:将实施例1中的3g 4,4'-双马来酰亚胺二苯甲烷替换为0g 4,4'-双马来酰亚胺二苯甲烷,即体系中不包含4,4'-双马来酰亚胺二苯甲烷。
对比例2:
本对比例采用与实施例1相同的方法制备利用废旧塑胶跑道粉末改性橡胶复合材料,区别在于:将实施例1中的0.2g DCP替换为0g DCP,即体系中不包含DCP。
表1聚苯乙烯改性塑胶跑道粉末配比
表2废旧塑胶跑道粉末改性橡胶复合材料配比
表3实施例和对比例的力学性能和自修复性能
实施例1 | 实施例2 | 实施例3 | 实施例4 | 对比例1 | 对比例2 | |
拉伸强度/MPa | 1.63 | 1.35 | 1.96 | 1.03 | 1.47 | 0.99 |
断裂伸长率/% | 470 | 552 | 510 | 625 | 595 | 637 |
自修复后拉伸强度/MPa | 1.59 | 1.25 | 1.87 | 0.96 | / | 0.85 |
自修复后断裂伸长率/% | 450 | 537 | 416 | 595 | / | 610 |
从上表数据中可以看出,实施例1、实施例2和实施例4中改性塑胶跑道粉末的质量分数不断降低,材料的拉伸强度也逐渐降低。表明改性塑胶跑道粉末有利于提高丁苯橡胶的力学性能。实施例1与实施例3相比,实施例3中4,4'-双马来酰亚胺二苯甲烷用量增加1倍,提高了材料的强度,也提高了自修复后的拉伸强度。
相比于实施例1,对比例1中没有加入4,4'-双马来酰亚胺二苯甲烷,因此拉伸强度只有1.47MPa,且没有自修复效果。
相比于实施例1,对比例2中没有加入硫化剂DCP,所得复合材料的拉伸强度不佳,但具有自修复效果。
以上材料自修复条件均为80℃、24h。
Claims (7)
1.一种利用废旧塑胶跑道粉末改性橡胶的方法,其特征在于包括如下步骤:
步骤1:对废旧塑胶跑道粉末进行改性,获得聚苯乙烯改性塑胶跑道粉末;
步骤2:将聚苯乙烯改性塑胶跑道粉末与丁苯橡胶基体、4,4'-双马来酰亚胺二苯甲烷按照特定顺序加入密炼机中,混炼得到废旧塑胶跑道粉末改性橡胶。
2.根据权利要求1所述的方法,其特征在于:
步骤1中,所述聚苯乙烯改性塑胶跑道粉末是由废旧塑胶跑道粉末分散在苯乙烯、二乙烯基苯和2-乙烯基呋喃中,溶胀、聚合后所制得聚苯乙烯改性塑胶跑道粉末,具体通过如下步骤制备获得:
1a、将废旧塑胶跑道粉碎,筛选获得直径≤0.5mm的粉末;
1b、将1a获得的废旧塑胶跑道粉末加入反应器中,随后加入苯乙烯、二乙烯基苯和2-乙烯基呋喃,并加入偶氮二异丁腈,完全浸没粉末后在室温下放置4-6h,使得废旧橡胶跑道粉末能够充分溶胀;
1c、将步骤1b溶胀后的废旧塑胶跑道粉末取出,分散到水中,并加入十二烷基苯磺酸钠,在80℃下反应3-4h,冷却至室温后过滤得到聚苯乙烯改性塑胶跑道粉末。
3.根据权利要求2所述的方法,其特征在于:
步骤1中各原料的添加量按质量份数为:废旧塑胶跑道粉末100份,苯乙烯100份,二乙烯基苯5-20份,2-乙烯基呋喃5-10份,偶氮二异丁腈0.5-2份,十二烷基苯磺酸钠1-5份,水500份。
4.根据权利要求1所述的方法,其特征在于:
步骤2中的加料顺序为:首先将橡胶基体与聚苯乙烯改性塑胶跑道粉末加入到密炼机中混炼一段时间,接着将4,4'-双马来酰亚胺二苯甲烷和2-乙烯基呋喃加入密炼机中混炼一段时间,最后加入交联剂DCP和防老剂D继续混炼,直至混炼均匀。
5.根据权利要求4所述的方法,其特征在于:
步骤2中,各原料的添加量按质量份数为:聚苯乙烯改性塑胶跑道粉末100份,丁苯橡胶100-200份,4,4'-双马来酰亚胺二苯甲烷5-15份,2-乙烯基呋喃5份,交联剂DCP1份,防老剂D1份。
6.根据权利要求4所述的方法,其特征在于:
密炼机温度设定为80-100℃,丁苯橡胶基体与聚苯乙烯改性塑胶跑道粉末的混炼时间为2-6min,加入4,4'-双马来酰亚胺二苯甲烷后混合物的混炼时间为2-6min,加入DCP和防老剂D后的混炼时间为2-6min。
7.根据权利要求4所述的方法,其特征在于:
将混炼后的橡胶置于模具中,升温到140℃,在10MPa压力作用下成型15min,在此过程中,呋喃与双马来酰亚胺会发生反应,形成可逆交联。
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