CN112322066B - Pvc用改性豆渣基环保型复合热稳定剂 - Google Patents
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Abstract
本发明涉及一种PVC用改性豆渣基环保型复合热稳定剂,该复合热稳定剂包含以下质量分数的组分:改性豆渣:30-45%;硬脂酸锌:20-30%;水滑石:10-20%;三羟甲基氨基甲烷:10-20%;1,3‑二甲基‑6‑氨基脲嘧啶:3-10%;所述改性豆渣是由豆渣经氧化和碱处理后制备。本发明涉及的复合热稳定剂能够显著改善PVC的热稳定性,初期着色轻微,长期热稳定性能优异。
Description
技术领域
本发明涉及PVC热稳定剂,特别涉及一种PVC用改性豆渣基环保型复合热稳定剂,属于材料加工助剂领域。
背景技术
PVC在加工温度下易发生分解,导致制品颜色加深,结构和性质发生改变。因此,在PVC的加工过程中,必须加入热稳定剂,以阻止或降低其分解。目前,常用的热稳定剂包括铅盐类、有机锡类、金属皂类和复合热稳定剂。铅盐类热稳定剂是开发最早并具有良好热稳定性能的PVC热稳定剂。然而,由于铅盐类化合物具有较强的毒性,对人体与环境安全形成危害,世界各国正逐渐限制铅盐类热稳定剂的使用。有机锡类热稳定剂的热稳定性和透明性较好,毒性小,是一类综合性能优良的PVC热稳定剂,但生产成本较高,使其应用受到限制。因此,开发低成本、高性能的环保型PVC复合热稳定剂,以取代铅盐类热稳定剂,促进PVC行业的“无铅化”,具有十分重要的意义。
豆渣是豆制品加工行业的主要副产物,每年湿豆渣的产量达2000余万吨。由于新鲜豆渣含水量大、蛋白质含量高,易腐败变质,使大部分豆渣直接被丢弃,造成资源浪费并污染环境。虽然目前已有较多关于豆渣的再利用研究,但多为利用其营养价值来生产食品或有益成分的提取,利用量较少,解决不了根本问题。豆渣的主要组分包括纤维素、蛋白质和脂肪,如能将其作为环保型PVC热稳定剂的组分,则可为豆渣的大规模资源化利用提供一种可行的新方法。
发明内容
本发明的目的是提供一种PVC用改性豆渣基环保型复合热稳定剂,该复合热稳定剂以改性豆渣为主组分,具有无毒环保、生物相容性好和成本低廉的优势,并能显著改善PVC加工过程中的热稳定性。
为了实现以上目的,本发明采取的技术方案是提供一种PVC用改性豆渣基环保型复合热稳定剂,包含以下质量含量的组分:
改性豆渣:30-45%;
硬脂酸锌:20-30%;
水滑石:10-20%;
三羟甲基氨基甲烷:10-20%;
1,3-二甲基-6-氨基脲嘧啶:3-10%;
所述改性豆渣是由豆渣经氧化和碱处理后制备。
所述改性豆渣的制备过程如下:将豆渣分散在水中,加入浓度为25-50%的双氧水,搅拌反应0.5-2小时,再加入氢氧化钠,继续搅拌反应0.5-2小时,其中,双氧水与豆渣的质量比为1-3:1,氢氧化钠与豆渣的质量比为0.5-1.5:1;反应完成后,再经离心、干燥和粉碎,得到改性豆渣。
本发明以改性豆渣为PVC复合热稳定剂的主组分。豆渣的主要组分包括纤维素、蛋白质和脂肪,经过氧化处理和碱处理后的改性豆渣含有大量的-COONa、-NH2和-OH基团。改性豆渣中的-COONa和-NH2基团能吸收PVC降解释放的HCl,抑制HCl对PVC的自催化降解,-OH基团能与Zn2+配位,抑制“锌烧”。通过上述作用,改性豆渣对PVC具有较好的热稳定性能。本发明涉及的各组分之间具有较好的协同作用,能够显著改善PVC的热稳定性,初期着色轻微,长期热稳定性能优异。
具体实施方式
下面对本发明的具体实施方式作进一步的详细说明。对于所属技术领域的技术人员而言,从对本发明的详细说明中,本发明的上述和其他目的、特征和优点将显而易见。
改性豆渣的优选制备:
改性豆渣是由豆渣经氧化和碱处理后制备,其优选制备过程为:将豆渣分散在水中,加入浓度为27.5%的双氧水,搅拌反应1.5小时,再加入氢氧化钠,继续搅拌反应1小时,其中,双氧水与豆渣的质量比为1.5:1,氢氧化钠与豆渣的质量比为0.8:1;反应完成后,再经离心、干燥和粉碎,得到改性豆渣。
实施例1:
本实施例的复合热稳定剂包含以下质量分数的组分:改性豆渣:40%;硬脂酸锌:25%;水滑石:12%;三羟甲基氨基甲烷:15%;1,3-二甲基-6-氨基脲嘧啶:8%。
实施例2:
本实施例的复合热稳定剂包含以下质量分数的组分:改性豆渣:45%;硬脂酸锌:20%;水滑石:15%;三羟甲基氨基甲烷:10%;1,3-二甲基-6-氨基脲嘧啶:10%。
实施例3:
本实施例的复合热稳定剂包含以下质量分数的组分:改性豆渣:30%;硬脂酸锌:30%;水滑石:20%;三羟甲基氨基甲烷:17%;1,3-二甲基-6-氨基脲嘧啶:3%。
热稳定性能测试
复合热稳定剂的性能采用哈普RM-200A转矩流变仪测试,测试条件:料温190℃,实验载荷5 kg,转速35 rpm。测试样品组成:54份PVC(SG-3型)树脂,1.6份复合热稳定剂,12份CaCO3,5份CPE,1.6份钛白粉,0.2份季戊四醇单硬脂酸酯,0.1份抗氧剂1010,0.2份PE蜡,1份ACR。测试方法:在转矩流变仪中混炼10分钟后取出样品,采用色差仪测试初期白度,并另外取样测试动态热稳定时间。测试结果见表1。
表1:PVC片热稳定性试验结果。
根据表1的结果,本发明提供的改性豆渣基环保型复合热稳定剂既能较好的抑制PVC初期着色,又对PVC具有良好的动态长期热稳定性能,是一种性能优良的PVC复合热稳定剂。此外,鉴于豆渣是豆制品加工产业的副产物,本发明提供的技术方案也为豆渣的资源化利用提供了一种可行的新方法。
应当理解,本发明虽然已通过以上实施例进行了清楚说明,然而在不背离本发明精神及其实质的情况下,所属技术领域的技术人员当可根据本发明作出各种相应的变化和修正,但这些相应的变化和修正都应属于本发明的权利要求的保护范围。
Claims (2)
1.PVC用改性豆渣基环保型复合热稳定剂,其特征在于,包含以下质量含量的组分:
改性豆渣:30-45%;
硬脂酸锌:20-30%;
水滑石:10-20%;
三羟甲基氨基甲烷:10-20%;
1,3-二甲基-6-氨基脲嘧啶:3-10%;
所述改性豆渣是由豆渣经氧化和碱处理后制备,并含有-COONa、-NH2和-OH基团。
2.根据权利要求1所述的复合热稳定剂,其特征在于,所述改性豆渣的制备过程如下:将豆渣分散在水中,加入浓度为25-50%的双氧水,搅拌反应0.5-2小时,再加入氢氧化钠,继续搅拌反应0.5-2小时,其中,双氧水与豆渣的质量比为1-3:1,氢氧化钠与豆渣的质量比为0.5-1.5:1;反应完成后,再经离心、干燥和粉碎,得到改性豆渣。
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