CN106496704A - 一种橡胶止水带的制备方法 - Google Patents
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Abstract
本发明公开了一种橡胶止水带的制备方法,属于止水带制备技术领域。本发明将氯丁橡胶、三元乙丙橡胶等混合,经二次密炼得熔融橡胶备用,再取聚醚二元醇、聚氧化丙烯二醇等搅拌反应后,与乙酸乙酯等搅拌制得缓膨型止水胶,将备用熔融橡胶经开炼、压延、模具中成型制得止水带基材,在基材上涂覆缓膨型止水胶后,风干制得橡胶止水带。本发明的有益效果是:本发明制备步骤简单,所得橡胶止水带具有较好的防水效果,使用有效期延长了2~3年;本发明橡胶止水带无脱落变形现象发生,抗老化性能好。
Description
技术领域
本发明涉及一种橡胶止水带的制备方法,属于止水带制备技术领域。
背景技术
建筑物、水坝的伸缩缝、结构缝等都要进行防水处理,目前应用最多的是橡胶止水带。橡胶止水带和止水橡皮系以天然橡胶与各种合成橡胶为主要原料,掺加各种助剂及填充料,经塑炼、混炼、压制成型。橡胶止水带必需采取可靠的固定措施,绑扎钢筋和支模时。防止在浇注混凝土时发生位移,保证止水带在混凝土中的正确位置。橡胶止水带是在浇注混凝土时被预埋在变形缝内,与混凝土连成一体,利用橡胶的高弹性和压缩变形性能,在不同载荷下产生弹性变形,从而发挥紧固密封功能,有效地防止建筑构件漏水、渗水,并起减震和缓冲作用,确保工程建筑构件的使用寿命。橡胶止水带在工程建设中主要用于浇捣混凝土的密封止水,由于橡胶止水带与混凝土是两种性质完全不同的材料,其接触面往往容易脱离或产生气孔,在工程结构复杂的情况下,其防水效果较差,使用有效期短,且随着伸缩缝、结构缝的位移、变形,止水带的撕裂、脱落、变形经常发生,造成了二次漏水,严重缩短了使用物的寿命。再由于橡胶内部存在许多双键结构,造成了橡胶止水带的抗老化性能差。
发明内容
本发明所要解决的技术问题:针对目前橡胶止水带防水效果较差,使用有效期短,易脱落变形,抗老化性能差的弊端,提供了一种将氯丁橡胶、三元乙丙橡胶等混合,经二次密炼得熔融橡胶备用,再取聚醚二元醇、聚氧化丙烯二醇等搅拌反应后,与乙酸乙酯等搅拌制得缓膨型止水胶,将备用熔融橡胶经开炼、压延、模具中成型制得止水带基材,在基材上涂覆缓膨型止水胶后,风干制得橡胶止水带的方法。本发明制备步骤简单,所得橡胶止水带防水效果好,抗老化性能强,有效解决了其使用有效期短、易脱落变形问题。
为解决上述技术问题,本发明采用如下所述的技术方案是:
(1)按重量份数计,称取30~40份氯丁橡胶、20~30份三元乙丙橡胶、10~15份碳酸钙、6~8份炭黑、10~15份乙烯-醋酸乙烯共聚物、2~5份抗氧化剂1010和8~12份活性硅微粉,依次加入到密炼机中,在160~170℃下密炼20~30min,再升温至170~180℃密炼1~2h,密炼结束,将密炼后的物料取出,得到熔融橡胶,备用;
(2)依次称取10~20g聚醚二元醇、6~8g聚氧化丙烯二醇和3~5g邻苯二甲酸二乙酯加入到反应釜中,进行真空加热,升温至90~100℃,搅拌反应2~3h,随后降温至60~70℃,再分别加入20~30g甲苯二异氰酸酯和10~15g三羟甲基丙烷,搅拌反应2~3h,得到聚氨酯预聚体;
(3)按重量份数计,称取20~30份上述聚氨酯预聚体、6~8份乙酸乙酯、12~15份纳米碳酸钙、6~8份玻璃微珠和1~3份硅烷偶联剂KH-550,加入到搅拌机中,在180~190℃搅拌5~10min,得到缓膨型止水胶;
(4)将步骤(1)备用的熔融橡胶加入到双辊开炼机中,控制辊筒温度为80~90℃,形成混炼胶,随后置于压延机中压延,得到胶片,将其置于模具中成型,控制温度为160~170℃,得到止水带基材,将止水带基材在100~110℃下加热3~5min,再将上述缓膨型止水胶涂覆于基材上,控制涂覆厚度为5~8mm,涂覆结束,用冷风风干,即可得到橡胶止水带。
本发明制得的橡胶止水带邵氏硬度为65~68H,拉伸强度为18~20MPa,扯断伸长率为386~398%,在75℃下压缩24~26h,压缩永久变形率为31.5~32.2%,在28℃下压缩170~180h,压缩永久变形率为17.5~18.1%,撕裂强度为26~35kN/m,体积膨胀率为103~112%;在72℃热空气下老化170~180h:邵氏硬度为9~10H,拉伸强度15~17MPa,扯断伸长率为310~325%;臭氧老化2级。
本发明与其他方法相比,有益技术效果是:
(1)本发明制备步骤简单,所得橡胶止水带具有较好的防水效果,使用有效期延长了2~3年;
(2)本发明橡胶止水带无脱落变形现象发生,抗老化性能好。
具体实施方式
首先按重量份数计,称取30~40份氯丁橡胶、20~30份三元乙丙橡胶、10~15份碳酸钙、6~8份炭黑、10~15份乙烯-醋酸乙烯共聚物、2~5份抗氧化剂1010和8~12份活性硅微粉,依次加入到密炼机中,在160~170℃下密炼20~30min,再升温至170~180℃密炼1~2h,密炼结束,将密炼后的物料取出,得到熔融橡胶,备用;依次称取10~20g聚醚二元醇、6~8g聚氧化丙烯二醇和3~5g邻苯二甲酸二乙酯加入到反应釜中,进行真空加热,升温至90~100℃,搅拌反应2~3h,随后降温至60~70℃,再分别加入20~30g甲苯二异氰酸酯和10~15g三羟甲基丙烷,搅拌反应2~3h,得到聚氨酯预聚体;然后按重量份数计,称取20~30份上述聚氨酯预聚体、6~8份乙酸乙酯、12~15份纳米碳酸钙、6~8份玻璃微珠和1~3份硅烷偶联剂KH-550,加入到搅拌机中,在180~190℃搅拌5~10min,得到缓膨型止水胶;最后将备用的熔融橡胶加入到双辊开炼机中,控制辊筒温度为80~90℃,形成混炼胶,随后置于压延机中压延,得到胶片,将其置于模具中成型,控制温度为160~170℃,得到止水带基材,将止水带基材在100~110℃下加热3~5min,再将上述缓膨型止水胶涂覆于基材上,控制涂覆厚度为5~8mm,涂覆结束,用冷风风干,即可得到橡胶止水带。
实例1
首先按重量份数计,称取30份氯丁橡胶、20份三元乙丙橡胶、10份碳酸钙、6份炭黑、10份乙烯-醋酸乙烯共聚物、2份抗氧化剂1010和8份活性硅微粉,依次加入到密炼机中,在160℃下密炼20min,再升温至170℃密炼1h,密炼结束,将密炼后的物料取出,得到熔融橡胶,备用;依次称取10g聚醚二元醇、6g聚氧化丙烯二醇和3g邻苯二甲酸二乙酯加入到反应釜中,进行真空加热,升温至90℃,搅拌反应2h,随后降温至60℃,再分别加入20g甲苯二异氰酸酯和10g三羟甲基丙烷,搅拌反应2h,得到聚氨酯预聚体;然后按重量份数计,称取20份上述聚氨酯预聚体、6份乙酸乙酯、12份纳米碳酸钙、6份玻璃微珠和1份硅烷偶联剂KH-550,加入到搅拌机中,在180℃搅拌5min,得到缓膨型止水胶;最后将备用的熔融橡胶加入到双辊开炼机中,控制辊筒温度为80℃,形成混炼胶,随后置于压延机中压延,得到胶片,将其置于模具中成型,控制温度为160℃,得到止水带基材,将止水带基材在100℃下加热3min,再将上述缓膨型止水胶涂覆于基材上,控制涂覆厚度为5mm,涂覆结束,用冷风风干,即可得到橡胶止水带。
本发明制得的橡胶止水带邵氏硬度为65H,拉伸强度为18MPa,扯断伸长率为386%,在75℃下压缩24h,压缩永久变形率为31.5%,在28℃下压缩170h,压缩永久变形率为17.5%,撕裂强度为26kN/m,体积膨胀率为103%;在72℃热空气下老化170h:邵氏硬度为9H,拉伸强度15MPa,扯断伸长率为310%;臭氧老化2级。
实例2
首先按重量份数计,称取35份氯丁橡胶、25份三元乙丙橡胶、13份碳酸钙、7份炭黑、13份乙烯-醋酸乙烯共聚物、4份抗氧化剂1010和10份活性硅微粉,依次加入到密炼机中,在165℃下密炼25min,再升温至175℃密炼2h,密炼结束,将密炼后的物料取出,得到熔融橡胶,备用;依次称取15g聚醚二元醇、7g聚氧化丙烯二醇和4g邻苯二甲酸二乙酯加入到反应釜中,进行真空加热,升温至95℃,搅拌反应3h,随后降温至65℃,再分别加入25g甲苯二异氰酸酯和13g三羟甲基丙烷,搅拌反应3h,得到聚氨酯预聚体;然后按重量份数计,称取25份上述聚氨酯预聚体、7份乙酸乙酯、13份纳米碳酸钙、7份玻璃微珠和2份硅烷偶联剂KH-550,加入到搅拌机中,在185℃搅拌8min,得到缓膨型止水胶;最后将备用的熔融橡胶加入到双辊开炼机中,控制辊筒温度为85℃,形成混炼胶,随后置于压延机中压延,得到胶片,将其置于模具中成型,控制温度为165℃,得到止水带基材,将止水带基材在105℃下加热4min,再将上述缓膨型止水胶涂覆于基材上,控制涂覆厚度为7mm,涂覆结束,用冷风风干,即可得到橡胶止水带。
本发明制得的橡胶止水带邵氏硬度为67H,拉伸强度为19MPa,扯断伸长率为392%,在75℃下压缩25h,压缩永久变形率为31.9%,在28℃下压缩175h,压缩永久变形率为17.8%,撕裂强度为31kN/m,体积膨胀率为108%;在72℃热空气下老化175h:邵氏硬度为10H,拉伸强度16MPa,扯断伸长率为318%;臭氧老化2级。
实例3
首先按重量份数计,称取40份氯丁橡胶、30份三元乙丙橡胶、15份碳酸钙、8份炭黑、15份乙烯-醋酸乙烯共聚物、5份抗氧化剂1010和12份活性硅微粉,依次加入到密炼机中,在170℃下密炼30min,再升温至180℃密炼2h,密炼结束,将密炼后的物料取出,得到熔融橡胶,备用;依次称取20g聚醚二元醇、8g聚氧化丙烯二醇和5g邻苯二甲酸二乙酯加入到反应釜中,进行真空加热,升温至100℃,搅拌反应3h,随后降温至70℃,再分别加入30g甲苯二异氰酸酯和15g三羟甲基丙烷,搅拌反应3h,得到聚氨酯预聚体;然后按重量份数计,称取30份上述聚氨酯预聚体、8份乙酸乙酯、15份纳米碳酸钙、8份玻璃微珠和3份硅烷偶联剂KH-550,加入到搅拌机中,在190℃搅拌10min,得到缓膨型止水胶;最后将备用的熔融橡胶加入到双辊开炼机中,控制辊筒温度为90℃,形成混炼胶,随后置于压延机中压延,得到胶片,将其置于模具中成型,控制温度为170℃,得到止水带基材,将止水带基材在110℃下加热5min,再将上述缓膨型止水胶涂覆于基材上,控制涂覆厚度为8mm,涂覆结束,用冷风风干,即可得到橡胶止水带。
本发明制得的橡胶止水带邵氏硬度为68H,拉伸强度为20MPa,扯断伸长率为398%,在75℃下压缩26h,压缩永久变形率为32.2%,在28℃下压缩180h,压缩永久变形率为18.1%,撕裂强度为35kN/m,体积膨胀率为112%;在72℃热空气下老化180h:邵氏硬度为10H,拉伸强度17MPa,扯断伸长率为325%;臭氧老化2级。
Claims (1)
1.一种橡胶止水带的制备方法,其特征在于具体制备步骤为:
(1)按重量份数计,称取30~40份氯丁橡胶、20~30份三元乙丙橡胶、10~15份碳酸钙、6~8份炭黑、10~15份乙烯-醋酸乙烯共聚物、2~5份抗氧化剂1010和8~12份活性硅微粉,依次加入到密炼机中,在160~170℃下密炼20~30min,再升温至170~180℃密炼1~2h,密炼结束,将密炼后的物料取出,得到熔融橡胶,备用;
(2)依次称取10~20g聚醚二元醇、6~8g聚氧化丙烯二醇和3~5g邻苯二甲酸二乙酯加入到反应釜中,进行真空加热,升温至90~100℃,搅拌反应2~3h,随后降温至60~70℃,再分别加入20~30g甲苯二异氰酸酯和10~15g三羟甲基丙烷,搅拌反应2~3h,得到聚氨酯预聚体;
(3)按重量份数计,称取20~30份上述聚氨酯预聚体、6~8份乙酸乙酯、12~15份纳米碳酸钙、6~8份玻璃微珠和1~3份硅烷偶联剂KH-550,加入到搅拌机中,在180~190℃搅拌5~10min,得到缓膨型止水胶;
(4)将步骤(1)备用的熔融橡胶加入到双辊开炼机中,控制辊筒温度为80~90℃,形成混炼胶,随后置于压延机中压延,得到胶片,将其置于模具中成型,控制温度为160~170℃,得到止水带基材,将止水带基材在100~110℃下加热3~5min,再将上述缓膨型止水胶涂覆于基材上,控制涂覆厚度为5~8mm,涂覆结束,用冷风风干,即可得到橡胶止水带。
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