CN105255434B - 一种改性湿固化聚氨酯热熔胶及其制备方法 - Google Patents

一种改性湿固化聚氨酯热熔胶及其制备方法 Download PDF

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CN105255434B
CN105255434B CN201510821013.XA CN201510821013A CN105255434B CN 105255434 B CN105255434 B CN 105255434B CN 201510821013 A CN201510821013 A CN 201510821013A CN 105255434 B CN105255434 B CN 105255434B
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曾作祥
曹�盛
李哲龙
朱万育
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Tianyang New Material Shanghai Technology Co ltd
East China University of Science and Technology
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Shanghai Tianyang Holt Melt Adhesive Materials Co Ltd
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Abstract

本发明公开一种改性湿固化聚氨酯热熔胶的制备方法,属于聚氨酯胶粘剂合成技术领域。本发明的创新之处在于:运用季戊四醇二丙烯酸酯,对传统湿固化聚氨酯热熔胶进行改性,由于这种含有两个羟基的丙烯酸酯能充当扩链剂,调节季戊四醇二丙烯酸酯的用量,将目标产物的粘度控制在合理的范围内,使得其便于施工且具有满意的初粘力,同时又由于该改性剂含有短支链功能基团丙烯酸酯,使得目标产物最终剥强也优于传统常规产品。

Description

一种改性湿固化聚氨酯热熔胶及其制备方法
技术领域
本发明公开了一种改性湿固化聚氨酯热熔胶及其制备方法,属于聚氨酯胶粘剂合成技术领域。
背景技术
湿固化聚氨酯胶粘剂是一种反应型胶粘剂,其胶粘机理不仅包含分子间作用力所贡献的粘接力,而且由于其中的-NCO基团与扩散到胶体内部的水分反应,生成了含有活泼氢的氨基,然后再与-NCO基团反应生产脲基,进而形成交联结构,实现与基材的粘合。粘结固化之后的胶体不仅不能再次熔融,而且由于胶体中的活泼组分与基材中的相应活泼组分反应,大大增强了胶的粘接强度。
随着人们的生活水平提高,对于服装消费品的要求和需求越来越高,各种特殊功能材料的面料衬布复合越来越多,各种面料的材质、品质不同,所需要用的胶粘剂的类型和施胶温度也不一样。中国专利CN201310469047.8公开了一种纺织品用湿固化反应型聚氨酯热熔胶的制备方法,但是初粘强度和终粘强度比较低,特别是其在上胶10min时的初粘力<1N/2.5cm;中国专利CN201410691126.8公开了一种PTMG改性湿固化聚氨酯热熔胶及其制备方法,通过往PUR中加入一种聚四氢呋喃迷PTMG,增加PUR的终粘强度,同时降低PUR的粘度,虽然低粘度的PUR便于施胶操作,但是初粘力仍然较低,其在上胶10min时的初粘力为1.12N/2.5cm,不能满足对初粘力和终粘强度要求都比较高的特定应用领域。
发明内容
本发明目的在于,解决上述技术问题,提供一种改性湿固化聚氨酯热熔胶及其制备方法,使得通过本大明所制备的湿固化聚氨酯热熔胶既具有较高的初粘力,亦具有较好的终粘强度。
本发明所采用的技术方案为:一种改性湿固化聚氨酯热熔胶的制备方法,包括以下步骤:
(1)将一定量的聚酯多元醇、聚醚多元醇和助剂加入到三口烧瓶中,在搅拌过程中加热到120-130℃,并在绝对压力80~150Pa下恒温脱水2.0h,然后降温到90℃,通氮气至常压;
(2)在氮气保护下,向上述反应体系中加入MDI和催化剂,在90~100℃、绝对压力80~100Pa条件下反应45min,再加入季戊四醇二丙烯酸酯,并于95~105℃、绝对压力80~100Pa下反应1.0h,得预聚物;
(3)将步骤(2)的产物转移至铝箔袋中,封口后在85℃条件下,熟化6h,得目标产物。
上述步骤(1)中,聚醚多元醇为数均分子量1000和4000的两种聚氧化丙烯二醇的混合物,以下将这两种聚氧化丙烯二醇分别简称为聚醚1000和聚醚4000;聚酯多元醇为数均分子量3000的聚己二酸己二醇酯二醇。
上述步骤(1)中,助剂包括催化剂、增粘剂和抗氧化剂。其中,催化剂为辛酸亚锡;增粘剂为萜烯树脂;抗氧化剂的牌号为CHINOX1010。
上述步骤(2)中,MDI为二苯基甲烷二异氰酸酯,选自4,4′-MDI、2,4′-MDI和2,2′-MDI中的一种。
以1.0mol聚醚1000为基准,其它反应物的摩尔数分别为:0.1~0.2mol聚醚4000;0.2~0.4mol聚己二酸己二醇酯二醇;2.7~3.65mol MDI;0.35~0.50mol季戊四醇二丙烯酸酯。
各助剂的添加量以占目标产物总质量的百分比计,分别为:催化剂0.1%,增粘剂18~25%,抗氧化剂0.50%。
本发明的创新之处:运用季戊四醇二丙烯酸酯,对传统湿固化聚氨酯热熔胶进行改性,由于这种含有两个羟基的丙烯酸酯能充当扩链剂,可通过调节季戊四醇二丙烯酸酯的用量,将目标产物的粘度控制在合理的范围内,使得其便于施工且具有满意的初粘力,同时又由于该改性剂含有短支链功能基团丙烯酸酯,使得目标产物最终剥强也优于传统产品。
具体实施方式
下面通过实施例对本发明做进一步表述,但并不以此为限。
实施例1
称取聚醚1000(100g),聚醚4000(72g),聚己二酸己二醇酯二醇(96g),萜烯树脂(80.1g),抗氧剂CHINOX1010(2.22g),加入三口烧瓶中,在搅拌过程中加热到120-130℃,并在绝对压力80~150Pa下恒温脱水2.0h,然后降温到90℃,通氮气至常压;在氮气保护下加4,4′-MDI(85.65g),催化剂辛酸亚锡(0.44g),然后在90~100℃、绝对压力80~100Pa条件下反应45min,再通氮气至常压、氮气保护下加入季戊四醇二丙烯酸酯(8.54g),于95~105℃、绝对压力80~100Pa下反应1.0h,得预聚物;
将上述预聚体在氮气保护下出料并密封包装,在85℃环境中熟化6小时。所得样品编号为P1。
实施例2
称取聚醚1000(100g),聚醚4000(40g),聚己二酸己二醇酯二醇(69g),萜烯树脂(86.95g),抗氧剂CHINOX1010(1.89g),加入三口烧瓶中,在搅拌过程中加热到120-130℃,并在绝对压力80~150Pa下恒温脱水2.0h,然后降温到90℃,通氮气至常压;在氮气保护下加2,4′-MDI(67.63g),催化剂辛酸亚锡(0.38g),然后在90~100℃、绝对压力80~100Pa条件下反应45min,再通氮气至常压、氮气保护下加入季戊四醇二丙烯酸酯(12.2g),于95~105℃、绝对压力80~100Pa下反应1.0h,得预聚物;
将上述预聚体在氮气保护下出料并密封包装,在85℃环境中熟化6小时。所得样品编号为P2。
实施例3
称取聚醚1000(100g),聚醚4000(80g),聚己二酸己二醇酯二醇(60g),萜烯树脂(113.1g),抗氧剂CHINOX1010(2.26g),加入三口烧瓶中,在搅拌过程中加热到120-130℃,并在绝对压力80~150Pa下恒温脱水2.0h,然后降温到90℃,通氮气至常压;在氮气保护下加2,2′-MDI(86.94g),催化剂辛酸亚锡(0.45g),然后在90~100℃、绝对压力80~100Pa条件下反应45min,再通氮气至常压、氮气保护下加入季戊四醇二丙烯酸酯(9.76g),于95~105℃、绝对压力80~100Pa下反应1.0h,得预聚物;
将上述预聚体在氮气保护下出料并密封包装,在85℃环境中熟化6小时。所得样品编号为P3。
实施例4
称取聚醚1000(100g),聚醚4000(40g),聚己二酸己二醇酯二醇(120g),萜烯树脂(102.35g),抗氧剂CHINOX1010(2.22g),加入三口烧瓶中,在搅拌过程中加热到120-130℃,并在绝对压力80~150Pa下恒温脱水2.0h,然后降温到90℃,通氮气至常压;在氮气保护下加4,4′-MDI(90.34g),催化剂辛酸亚锡(0.27g),然后在90~100℃、绝对压力80~100Pa条件下反应45min,再通氮气至常压、氮气保护下加入季戊四醇二丙烯酸酯(9.76g),于95~105℃、绝对压力80~100Pa下反应1.0h,得预聚物;
将上述预聚体在氮气保护下出料并密封包装,在85℃环境中熟化6小时。所得样品编号为P4。
样品测试
采用Brookfield粘度仪对样品P1~P4及市售同类常规产品的黏度进行了测试,温度分别控制在100℃和120℃;
上述样品及市售常规同类产品的剥离强度测试参照标准FZ/T 01085-2009,所用被粘物为涤棉6535,施胶温度为100℃;
分别测定粘合后的试样放置10min和48h的剥离强度,并分别定义10min的剥强为初始剥强、48h的剥强为最终剥强;各述测试结果参见下表1。
表1各样品的熔融粘度、初粘强度以及最终剥强
从上表1中可明显看出,通过本发明所制备的湿固化聚氨酯热熔胶与市售常规同类产品相较,
在施胶量相对持平的情况下,上胶后10min后的剥离强度明显较高,上胶48h后的剥离强度亦明显较高,即通过本发明所制备的湿固化聚氨酯热熔胶既具有较好的初粘力,亦具备较高的终粘强度。

Claims (4)

1.一种改性湿固化聚氨酯热熔胶的制备方法,其特征在于,包括以下步骤:
(1)将一定量的聚酯多元醇、聚醚多元醇和助剂加入到三口烧瓶中,在搅拌过程中加热到120-130℃,并在绝对压力80 ~ 150 Pa下恒温脱水2.0 h,然后降温到90℃,通氮气至常压;
(2)在氮气保护下,向上述反应体系中加入MDI和催化剂,在90~100℃、绝对压力80 ~100Pa条件下反应45 min,再加入季戊四醇二丙烯酸酯, 并于95~105℃、绝对压力80~100Pa下反应1.0 h,得预聚物;
(3)将步骤(2)的产物转移至铝箔袋中,封口后在85℃条件下,熟化6 h,得目标产物;
所述聚醚多元醇为数均分子量1000和4000的两种聚氧化丙烯二醇的混合物;所述聚酯多元醇为数均分子量3000的聚己二酸己二醇酯二醇;
以1.0 mol数均分子量1000的聚氧化丙烯二醇为基准,其它反应物的摩尔数分别为:0.1~0.2 mol数均分子量4000的聚氧化丙烯二醇;0.2~0.4 mol聚己二酸己二醇酯二醇;2.7~3.65 mol MDI;0.35~0.50 mol季戊四醇二丙烯酸酯。
2.如权利要求1所述的改性湿固化聚氨酯热熔胶的制备方法,其特征在于:所述助剂包括催化剂、增粘剂和抗氧化剂;其中,催化剂为辛酸亚锡,增粘剂为萜烯树脂,抗氧化剂的牌号为CHINOX1010。
3.如权利要求2所述的改性湿固化聚氨酯热熔胶的制备方法,其特征在于:各助剂的添加量以占目标产物总质量的百分比计,分别为:催化剂0.1%,增粘剂18~25%,抗氧化剂0.50%。
4.如权利要求1所述的改性湿固化聚氨酯热熔胶的制备方法,其特征在于:所述MDI为二苯基甲烷二异氰酸酯,选自4,4′-MDI、2,4′-MDI和2,2′-MDI中的一种。
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