CN111072904A - 一种聚氨酯弹性体组合物及分体活塞 - Google Patents

一种聚氨酯弹性体组合物及分体活塞 Download PDF

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CN111072904A
CN111072904A CN201911397710.1A CN201911397710A CN111072904A CN 111072904 A CN111072904 A CN 111072904A CN 201911397710 A CN201911397710 A CN 201911397710A CN 111072904 A CN111072904 A CN 111072904A
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陈孟宏
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Changsha Zhongjing Machinery Co ltd
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Abstract

本发明公开了一种聚氨酯弹性体组合物及分体活塞，该组合物包括按重量份计的以下组分：聚四氢呋喃二元醇100份，二苯基甲烷二异氰酸酯25‑35份，1,4‑丁二醇9‑15份，3,5‑二甲硫基甲苯二胺2‑5份，有机铋催化剂0.3‑0.5份，抗氧剂0.3‑0.5份，紫外线吸收剂0.4‑0.6份。各组分搭配，可大大降低磨耗，减少压缩永久变形，提高耐热性和耐水性，延长活塞使用寿命。

Description

一种聚氨酯弹性体组合物及分体活塞
技术领域
本发明涉及聚氨酯弹性体材料技术领域，具体涉及一种聚氨酯弹性体组合物及分体活塞。
背景技术
混凝土泵工作过程中，利用活塞在缸体内的往复运动，使混凝土通过管路连续压送到浇筑工作面，由于活塞是与混凝土接触且直接推动混凝土做功受力的部件，要承受混凝土的压力和撞击，极易造成发热和磨损。
聚氨酯弹性体具有优异的耐磨性，是普通橡胶的10倍以上，目前正逐渐取代传统的丁腈橡胶，成为泵用活塞的主流材料。但现有材料耐热性和耐水性不佳，压缩永久变形大，对聚氨酯的使用寿命有较大影响，因此，传统的聚氨酯活塞使用寿命一般在1.2万方左右，设备的运行和维护成本依然较高。
发明内容
本发明旨在至少解决现有技术中存在的技术问题之一，第一方面，提出一种聚氨酯弹性体组合物，提高耐水性和使用温度，降低磨耗，从而延长活塞使用寿命。
根据本发明实施例的聚氨酯弹性体组合物，包括按重量份计的以下组分：
聚四氢呋喃二元醇100份，二苯基甲烷二异氰酸酯(MDI)25-35份，1,4-丁二醇9-15份，3,5-二甲硫基甲苯二胺2-5份，有机铋催化剂0.3-0.5份，抗氧剂0.3-0.5份，紫外线吸收剂0.4-0.6份。
根据本发明实施例的聚氨酯弹性体组合物，至少具有如下有益效果：
聚四氢呋喃构成软段，与MDI反应，用一定量的1,4-丁二醇和3,5-二甲硫基甲苯进行扩链，在有机铋催化剂的催化下可获得具有优异耐磨性、耐热性和耐水性的聚氨酯弹性体，压缩永久变形率明显降低，用于活塞制备，平均使用方量得到明显提高。
优选的，所述聚四氢呋喃二元醇分子量为1000-2000。
优选的，所述有机铋催化剂为辛酸铋，与其他催化剂相比，能更好地控制反应速率。
优选的，还包括色浆适量，所述色浆根据产品颜色选择，用量优选为0.05-0.2份。
第二方面，提供一种分体活塞，采用上述聚氨酯弹性体组合物制成。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合具体实施例作进一步地详细描述。此处所描述的实施例仅是本申请一部分实施例，不能理解为对本申请保护范围的限制。
以下实施例中，聚四氢呋喃二元醇PTMG-2000，购自巴斯夫；有机铋催化剂为辛酸铋TEGOKAT722，购自德国Goldschmidt公司；MDI，抗氧剂264，紫外线吸收剂UV-9，均购自拜耳；蓝色浆BU01，购自德国莱茵化工；3,5-二甲硫基甲苯二胺，Ethacure 300，购自美国Albemarle公司。
实施例1-3
实施例1-3的配方见表1。
表1(重量份)
Figure BDA0002346755460000021
Figure BDA0002346755460000031
对比例1
与实施例1相比，区别在于，将MDI替换为等摩尔数的TDI。
对比例2
与实施例1相比，区别在于，将3,5-二甲硫基甲苯二胺用等量的1,4-丁二醇替代。
分别将各实施例和对比例除催化剂以外的各组分混合，加热至65～80℃，搅拌均匀，加入辛酸铋，再次搅拌均匀，倒入封闭的磨具内，按表2的测试项目制成样条或活塞样品。固化条件为：110～130℃预固化1h，110～120℃后固化16h。
除方量以外，每组样品的每个测试项目至少平行测试5次，取平均值。方量测试条件为：将每组样品制成活塞，安装在车载泵上现场试用，每个样品试用活塞数为10个以上，取平均值。
测试结果如表2所示。
表2
Figure BDA0002346755460000041
由以上结果可知，本实施例组合物100℃水煮后，拉伸强度保有率大于85％，长期使用温度可达98℃以上，而市售同类产品一般在80℃左右。阿克隆磨耗呈指数级降低，压缩永久变型率也有一定程度改善，活塞产品使用平均方量可提升至2万方以上，最高方量可达4万方以上，而市面上常见的聚氨酯活塞在车载泵上的使用寿命一般在1.5万方以下，可见，本实施例方案能明显提高活塞的使用寿命，应用价值显著。

Claims (5)

1.一种聚氨酯弹性体组合物，其特征在于，包括按重量份计的以下组分：
聚四氢呋喃二元醇100份，二苯基甲烷二异氰酸酯25-35份，1,4-丁二醇9-15份，3,5-二甲硫基甲苯二胺2-5份，有机铋催化剂0.3-0.5份，抗氧剂0.3-0.5份，紫外线吸收剂0.4-0.6份。
2.根据权利要求1所述的聚氨酯弹性体组合物，其特征在于，所述聚四氢呋喃二元醇分子量为1000-2000。
3.根据权利要求1所述的聚氨酯弹性体组合物，其特征在于，所述有机铋催化剂为辛酸铋。
4.根据权利要求1所述的聚氨酯弹性体组合物，其特征在于，还包括色浆适量。
5.一种分体活塞，其特征在于，采用权利要求1-4任一项所述的聚氨酯弹性体组合物制成。
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