CN105111572B - 用于制备车身空腔隔音块的膨胀材料及其制备方法 - Google Patents
用于制备车身空腔隔音块的膨胀材料及其制备方法 Download PDFInfo
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Abstract
一种用于制备车身空腔隔音块的膨胀材料，其主要组分为乙烯/丙烯酸甲酯共聚物、乙烯/丙烯酸丁脂共聚物和乙烯/马来酸酐/丙烯酸乙酯三元共聚物，外加其它辅助料。本发明由于加入了高熔融指数的乙烯/马来酸酐/丙烯酸乙酯三元共聚物，使得用于制备车身空腔隔音块的膨胀材料的熔融指数数值显著提高，提高了材料注塑的流动性，减少了生产的缺料和压坏的报废率，对改善膨胀材料的空腔封堵性能效果显著，有明显的提高生产效率作用，材料的四项排放性能有明显的改善，并基本保持树脂的原有特性，用于制备车身空腔隔音块效果良好。
Description
技术领域
本发明涉及化学组合物，尤其涉及一种用于制备车身空腔隔音块的膨胀材料及其制备方法。
背景技术
现有技术的车身空腔膨胀材料一般是由EVA\EMA\EBA等材料来制备的，由于这些材料必须要求达到一定的胶含量和一定耐热温度，所以材料要进行聚合和共聚，组合后材料的耐热温度达到要求，材料发泡性能也符合主机厂的装车要求，生产出的产品性能稳定性比较好，发泡的泡孔均匀，表面光滑，与进口产品相比各有优缺点。但是EVA\EMA\EBA原材料的熔酯数值都比较小，最小的仅0.5g/10min，大一点的在8-9g/10min左右。
如专利CN1887949使用的EMA\EBA\EMMA原料为基料，可以很好的解决材料的发泡问题及耐温和气味，但使用的基料是EMA\EBA\EMMA，这些基料的熔酯数值都很低，在生产时由于流动性不佳，容易出现缺料和压坏，发泡时由于熔迹痕太明显而影响材料封堵空腔的功能。
发明内容
本发明的目的，就是为了解决上述问题，提供一种新型的用于制备车身空腔隔音块的膨胀材料及其制备方法。
为了达到上述目的，本发明采用了以下技术方案：一种用于制备车身空腔隔音块的膨胀材料，包括以下组分及重量份含量：
所述交联剂选自DCP或无味DCP。
所述第一发泡剂选自OBSH粉剂或OBSH颗粒。
所述第二发泡剂选自AC粉剂或AC颗粒。
所述稳定剂选自铅盐类、有机锡类、金属皂类、稀土类稳定剂或硬脂酸锌。
所述抗氧剂选自抗氧剂KY-7910、抗氧剂KY-7920、抗氧剂1010或抗氧剂168。
所述填充剂选自碳酸钙、滑石粉、硫酸钡、硅藻土或稀土类物质。
上述用于制备车身空腔隔音块的膨胀材料的制备方法，包括以下步骤：
一、将配比量的乙烯/丙烯酸甲酯共聚物、乙烯/丙烯酸丁脂共聚物和乙烯/马来酸酐/丙烯酸乙酯三元共聚物放入混料机中搅拌充分，再将配比量的其他物质预混后，再放入混料机中搅拌均匀，制成混合料；
二、挤出机先预热到95-115℃温度，待挤出温度稳定在95-115℃后，放入混合料，按挤出工艺进行挤出造粒，烘干包装入库。
乙烯/丙烯酸甲酯共聚物的熔融指数为3.5-8g/10min，乙烯/丙烯酸丁脂共聚物的熔融指数为2.8-5g/10min，而乙烯/马来酸酐/丙烯酸乙酯三元共聚物的熔融指数为40-70g/10min以上。本发明由于加入了高熔融指数的乙烯/马来酸酐/丙烯酸乙酯三元共聚物，使得用于制备车身空腔隔音块的膨胀材料的熔融指数数值显著提高，(由2.2-2.5g/10min提高到20g/10min以上)减少了生产的缺料和压坏的报废率，对改善膨胀材料的空腔封堵性能效果显著，有明显的提高生产效率作用，材料的四项排放性能有明显的改善，并基本保持树脂的原有特性，用于制备车身空腔隔音块效果良好。
将本发明的膨胀材料与PA66注塑骨架进行二次注塑，即可得到车身空腔隔音块。
具体实施方式
实施例1
将20公斤乙烯/丙烯酸甲酯共聚物、30公斤乙烯/丙烯酸丁脂共聚物和50公斤乙烯/马来酸酐/丙烯酸乙酯三元共聚物放入混料机中搅拌充分，另将1.2公斤DCP、1.8公斤OBSH颗粒和0.8公斤的AC颗粒、0.4公斤硬脂酸锌、0.4公斤抗氧剂KY-7910、5.5公斤碳酸钙和0.3公斤的色母预混后，再放入混料机中搅拌均匀，制成混合料；然后，通过挤出机在95-115℃下按挤出工艺进行挤出造粒，烘干，即得到本发明的一种用于制备车身空腔隔音块的膨胀材料。
实施例2
将15公斤乙烯/丙烯酸甲酯共聚物、40公斤乙烯/丙烯酸丁脂共聚物和45公斤乙烯/马来酸酐/丙烯酸乙酯三元共聚物放入混料机中搅拌充分，另将0.8公斤无味DCP、1.0公斤OBSH粉剂和1.5公斤的AC粉剂、0.5公斤二盐基硬脂酸铅、0.2公斤抗氧剂1010、6.5公斤滑石粉和0.1公斤的色母预混后，再放入混料机中搅拌均匀，制成混合料；然后，通过挤出机在95-115℃下按挤出工艺进行挤出造粒，烘干，即得到本发明的一种用于制备车身空腔隔音块的膨胀材料。
实施例3
将17.5公斤乙烯/丙烯酸甲酯共聚物、35公斤乙烯/丙烯酸丁脂共聚物和47.5公斤乙烯/马来酸酐/丙烯酸乙酯三元共聚物放入混料机中搅拌充分，另将1公斤DCP、1.4公斤OBSH颗粒和1.15公斤的AC颗粒、0.5公斤TX-3、0.3公斤抗氧剂KY-7920、6公斤硫酸钡和0.2公斤的色母预混后，再放入混料机中搅拌均匀，制成混合料；然后，通过挤出机在95-115℃下按挤出工艺进行挤出造粒，烘干，即得到本发明的一种用于制备车身空腔隔音块的膨胀材料。
对比例1
基本同实施例1，不同的是，用乙烯/马来酸酐/丙烯酸丁酯三元共聚物代替了实施例1的乙烯/马来酸酐/丙烯酸乙酯三元共聚物。
对比例2
基本同实施例2，不同的是，用乙烯/马来酸酐/丙烯酸丁酯三元共聚物代替了实施例2的乙烯/马来酸酐/丙烯酸乙酯三元共聚物。
对上述各实施例和对比例所得膨胀材料的熔融指数、粘结性能、气味、冷凝、总碳、甲醛含量和发泡倍率分别进行了检测，试验数据如表1所示。
表1
| 试验项目 | 实施例1 | 实施例2 | 实施例3 | 对比例1 | 对比例2 |
| 熔融指数(g/10min) | 22.8 | 20.8 | 21.8 | 5.25 | 4.56 |
| 粘结性能(％) | 100 | 95 | 98 | 60 | 45 |
| 气味≤3级 | 3.5 | 3.5 | 3.5 | 4 | 4 |
| 冷凝≤2mg | 2.3 | 2.4 | 2.2 | 4.15 | 4.65 |
| 总碳≤50ugc/kg | 36.5 | 38 | 34.5 | 55 | 61 |
| 甲醛含量≤10mg/kg | 0.43 | 0.35 | 0.41 | 0.04 | 0.06 |
| 发泡倍率(％) | 9.2 | 9.5 | 9.1 | 8.1 | 7.0 |
由表1可见，采用本发明的配方制作的膨胀材料，其熔融指数明显高于对比例，其粘结性能明显好于对比例，其发泡倍率也高于对比例。
Claims (7)
1.一种用于制备车身空腔隔音块的膨胀材料，其特征在于：包括以下组分及重量份含量：
所述稳定剂选自铅盐类、有机锡类、金属皂类、稀土类稳定剂或硬脂酸锌。
2.如权利要求1所述的用于制备车身空腔隔音块的膨胀材料，其特征在于：所述交联剂选自DCP或无味DCP。
3.如权利要求1所述的用于制备车身空腔隔音块的膨胀材料，其特征在于：所述第一发泡剂选自OBSH粉剂或OBSH颗粒。
4.如权利要求1所述的用于制备车身空腔隔音块的膨胀材料，其特征在于：所述第二发泡剂选自AC粉剂或AC颗粒。
5.如权利要求1所述的用于制备车身空腔隔音块的膨胀材料，其特征在于：所述抗氧剂选自抗氧剂KY-7910、抗氧剂KY-7920、抗氧剂1010或抗氧剂168；
6.如权利要求1所述的用于制备车身空腔隔音块的膨胀材料，其特征在于：所述填充剂选自碳酸钙、滑石粉、硫酸钡、硅藻土或稀土类物质。
7.权利要求1所述的用于制备车身空腔隔音块的膨胀材料的制备方法，其特征在于，包括以下步骤：
一、将配比量的乙烯/丙烯酸甲酯共聚物、乙烯/丙烯酸丁脂共聚物和乙烯/马来酸酐/丙烯酸乙酯三元共聚物放入混料机中搅拌充分，再将配比量的其他物质预混后，再放入混料机中搅拌均匀，制成混合料；
二、挤出机先预热到95-115℃温度，待挤出温度稳定在95-115℃后，放入混合料，按挤出工艺进行挤出造粒，烘干包装入库。
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