CN116901554B - 一种复合保湿布及其制备方法 - Google Patents
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Abstract
本申请涉及新型材料技术领域,具体公开了一种复合保湿布及其制备方法,一种复合保湿布包括表层、中间层和底层,所述中间层与底层通过针刺复合,所述将针刺复合的中间层与表层通过超声波压合,所述中间层包括以下重量份数的原料:聚丙烯酸钠50‑70份,1,1,‑二甲基‑4,4,联吡啶阳离子15‑30份。本申请制备的复合保湿布具有保湿和除草的优点。
Description
技术领域
本发明涉及新型材料的技术领域,尤其是涉及一种复合保湿布及其制备方法。
背景技术
科学调查显示,一般果园林场在山上,路程不方便,高山地区灌溉也不方便,有些地区持续干旱,给经济作物造成重大损失,而且山上土壤水分挥发比较快,农作物和水果所需的水分要多,此外,果园、林场人工锄草约占总用工的30%以上,而杂草灌木本身具有的顽强生命力及其对不良气候条件的较强适应能力,需要人工锄草或者喷洒除草剂每年2-4次,造成人工成本居高不下并且会造成水土流失,同时,除草剂对土壤、空气造成严重污染。近两年,面对严峻的形势,节水意识、环保意识、科学利用能源等意识亟需强化,开发环保新型材料取代传统材料或方法,已经成为大家的共识。现阶段缺乏一种应用于农田、果园和林场的具有除草和保湿的保湿布,同时具有除草和保湿的功效。
发明内容
为了使保湿布具有除草和保湿的功效,本申请提供一种复合保湿布及其制备方法。
本申请提供的一种复合保湿布,采用如下的技术方案:
一种复合保湿布,包括表层、中间层和底层,所述中间层与底层通过针刺复合,所述将针刺复合的中间层与表层通过超声波压合,所述中间层包括以下重量份数的原料:聚丙烯酸钠50-70份,1,1,-二甲基-4,4,联吡啶阳离子15-30份。
通过采用上述技术方案,本申请采用表层、中间层和底层复合制备保湿布,各层之间各自发挥不同的作用,使复合保湿布应用于农田、果园和林场等干旱地区,具有保湿,抑制杂草生长,并且耐用性好,由于中间层采用聚丙烯酸钠和1,1,-二甲基-4,4,联吡啶阳离子原材料,聚丙烯酸钠作为新型吸水性材料,能够吸收多于自身几百倍的水,保湿布中的高吸水性树脂吸水膨胀后变成透明颗粒状,将流动的液态水固定保存,成为一个固体的微型水库。1,1,-二甲基-4,4,联吡啶阳离子俗称百草枯,在杂草刚生长和发芽时期就使其干枯,广泛应用于果园、桑园、橡胶园、稻田、旱地以及免耕种植地的除草,能大范围触杀地面杂草,通过将这两者材料结合,作为中间层原料,使复合保湿布达到保湿和除草的功效。
可选的,所述聚丙烯酸钠的吸水量为自身重量的280-500倍。
通过采用上述技术方案,由于采用聚丙烯酸钠,聚丙烯酸钠分子链富含羧基基团,其吸水量能够满足干旱缺水保湿的要求,因此,选用高吸水的聚丙烯酸钠能够获得保湿的效果。
可选的,所述中间层包括以下制备步骤:将聚丙烯酸钠在50-70℃下溶解于水中,得到质量浓度为40-65wt%的聚丙烯酸钠水溶液,然后加入1,1,-二甲基-4,4,联吡啶阳离子,搅拌混合均匀,在40-50℃下干燥24-48h,得到了吸附1,1,-二甲基-4,4,联吡啶阳离子的聚丙烯酸钠。
通过采用上述技术方案,将聚丙烯酸钠在加热下溶解在水中,然后加入1,1,-二甲基-4,4,联吡啶阳离子,聚丙烯酸钠为阴离子物质,由此通过混合,将1,1,-二甲基-4,4,联吡啶阳离子通过静电吸附在聚丙烯酸钠分子上,由此,1,1,-二甲基-4,4,联吡啶阳离子作为除草剂,可以缓慢解吸释放,从而消除杂草的生长。
可选的,所述表层包括以下成分:PP再生料和PE再生料。
通过采用上述技术方案,本申请文件采用PP再生料和PE再生料作为表层材料,达到固废回收再利用的目的,此外,PP再生料和PE再生料二者结合,PP材料具有防潮、抗氧、耐酸和耐碱,但是PP材料具有一定的气孔,会造成水分的蒸发,由此结合透气性差的PE材料,使表层具有防止水分蒸发和反光效果。
可选的,所述PP再生料和PE再生料的重量比为(2-4):(5-8)。
通过采用上述技术方案,调整这两者材料的配比,制备的表层具有优良的透气、减少水分蒸发的效果。
可选的,所述表层包括以下制备步骤:将PP再生料和PE再生料在260-280℃下纺成初生丝,所得的初生丝经4000-5000倍牵伸后经气流喷丝成丝细度为4-12dt的纤维网,将纤维网通过针刺加固得到复合无纺布。
通过采用上述技术方案,将PP再生料和PE再生料在高温下纺织成丝,然后喷丝织成纤维网,紧接着将纤维网通过针刺加固,由于初生的纤维网强度较低,针刺加固得到一定强度和厚度的无纺布。
可选的,所述底层为黑色的PP无纺布。
通过采用上述技术方案,黑色的PP无纺布可遮光,减少光合作用,提高材料的耐久性。
第二方面,本申请提供一种复合保湿布的制备方法,采用如下的技术方案:
一种复合保湿布的制备方法,包括以下制备步骤:将吸附了1,1,-二甲基-4,4,联吡啶阳离子的聚丙烯酸钠与复合无纺布进行针刺复合,针刺密度为150-200次/cm2,针刺复合完成后通过超声波压合,超声频率为1.5-2wHz,得到复合保湿布。
通过采用上述技术方案,首先中间层采用高吸水性材料和具有抑制杂草生长的除草剂,再针刺加固在复合无纺布上,紧接着通过超声波压合,将表层、中间层和底层紧密结合在一起,制备得到复合保湿布,解决干旱地区缺水,除草不方便的情况。
综上所述,本申请具有以下有益效果:
1、由于本申请采用聚丙烯酸钠和1,1,-二甲基-4,4,联吡啶阳离子作为中间层原料,聚丙烯酸钠作为新型吸水性材料,能够吸收多于自身几百倍的水,1,1,-二甲基-4,4,联吡啶阳离子俗称百草枯,在杂草刚生长和发芽时期就使其干枯,通过将这两者材料结合,使复合保湿布达到保湿和除草的功效。
2、本申请采用PP再生料和PE再生料作为表层材料,达到固废回收再利用的目的,此外,PP再生料和PE再生料二者结合,PP材料具有防潮、抗氧、耐酸和耐碱,但是PP材料具有一定的气孔,会造成水分的蒸发,由此结合透气性差的PE材料,使表层具有防止水分蒸发和反光效果。
具体实施方式
以下结合实施例和对比例对本申请作进一步详细说明。
实施例
实施例1
一种复合保湿布的制备方法,包括如下制备步骤:
首先将PP再生料和PE再生料干燥,PP再生料和PE再生料的重量比为3:6,将干燥好的PP再生料和PE再生料送入挤压机里熔融混合,在6公斤的压力下送入纺丝箱体,纺丝温度控制在270℃,纺丝出直径为0.35mm的初生丝,初生丝经过4000-5000倍的牵伸,使初生丝达到4-12dtx细度后经气流喷丝均匀成纤维网,PP再生料和PE再生料购自青州市何官镇建国塑料厂,将纤维网再通过针刺加固,针刺密度为200次/cm2,纵横向断裂强度大于5.2KN/m,厚度控制在1.8mm左右,得到复合无纺布;
将60kg聚丙烯酸钠在65℃下溶解于水中,得到质量浓度为55wt%的聚丙烯酸钠水溶液,然后加入25kg1,1,-二甲基-4,4,联吡啶阳离子,搅拌混合均匀,在45℃下干燥40h,得到了吸附1,1,-二甲基-4,4,联吡啶阳离子的聚丙烯酸钠作为中间层,其中聚丙烯酸钠购自长安胜利油田,型号为4534,聚丙烯酸钠的吸水量为自身重量的480倍;1,1,-二甲基-4,4,联吡啶阳离子购自上海吉至生化科技有限公司,型号为P74570;
将制备的中间层与复合无纺布同时进入针刺机,经过针刺复合,针刺密度为180次/cm2,针刺完成后与底层PP无纺布通过超声波压合,超声频率为1.8wHz,得到复合保湿布。
实施例2
一种复合保湿布的制备方法,与实施例1的不同之处在于,将50kg聚丙烯酸钠在50℃下溶解于水中,得到质量浓度为40wt%的聚丙烯酸钠水溶液,然后加入15kg1,1,-二甲基-4,4,联吡啶阳离子,搅拌混合均匀,在40℃下干燥24h,得到了吸附1,1,-二甲基-4,4,联吡啶阳离子的聚丙烯酸钠作为中间层,聚丙烯酸钠的吸水量为自身重量的280倍,PP再生料和PE再生料的重量比为2:5,PP再生料和PE再生料在260℃下纺成初生丝,中间层与复合无纺布的针刺密度为150次/cm2,超声波压合频率为1.5wHz。
实施例3
一种复合保湿布的制备方法,与实施例1的不同之处在于,将70kg聚丙烯酸钠在70℃下溶解于水中,得到质量浓度为65wt%的聚丙烯酸钠水溶液,然后加入30kg1,1,-二甲基-4,4,联吡啶阳离子,搅拌混合均匀,在50℃下干燥48h,得到了吸附1,1,-二甲基-4,4,联吡啶阳离子的聚丙烯酸钠作为中间层,聚丙烯酸钠的吸水量为自身重量的500倍,PP再生料和PE再生料的重量比为4:8,PP再生料和PE再生料在280℃下纺成初生丝,中间层与复合无纺布的针刺密度为200次/cm2,超声波压合频率为2wHz。
实施例4
一种复合保湿布的制备方法,与实施例1的不同之处在于,丙烯酸钠的吸水量为自身重量的150倍。
实施例5
一种复合保湿布的制备方法,与实施例1的不同之处在于,PP再生料和PE再生料的重量比为1:4。
实施例6
一种复合保湿布的制备方法,与实施例1的不同之处在于,PP再生料和PE再生料的重量比为5:9。
实施例7
一种复合保湿布的制备方法,与实施例1的不同之处在于,超声波压合的超声频率为1wHz。
实施例8
一种复合保湿布的制备方法,与实施例1的不同之处在于,超声波压合的超声频率为2.5wHz。
对比例
对比例1
一种复合保湿布的制备方法,与实施例1的不同之处在于,原料不包括聚丙烯酸钠。
对比例2
一种复合保湿布的制备方法,与实施例1的不同之处在于,原料不包括1,1,-二甲基-4,4,联吡啶阳离子。
对比例3
一种复合保湿布的制备方法,与实施例1的不同之处在于,原料不包括聚丙烯酸钠和1,1,-二甲基-4,4,联吡啶阳离子。包括如下制备步骤:首先将PP再生料和PE再生料干燥,PP再生料和PE再生料的重量比为3:6,将干燥好的PP再生料和PE再生料送入挤压机里熔融混合,在6公斤的压力下送入纺丝箱体,纺丝温度控制在270℃,纺丝出直径为0.35mm的初生丝,初生丝经过4000-5000倍的牵伸,使初生丝达到4-12dtx细度后经气流喷丝均匀成纤维网,PP再生料和PE再生料购自青州市何官镇建国塑料厂,将纤维网再通过针刺加固,针刺密度为200次/cm2,纵横向断裂强度大于5.2KN/m,厚度控制在1.8mm左右,得到复合无纺布;复合无纺布与底层PP无纺布通过超声波压合,超声频率为1.8wHz,得到复合保湿布。
对比例4
一种复合保湿布的制备方法,与实施例1的不同之处在于,将表层材料替换为PP无纺布。
性能检测试验
检测方法
采用实施例1-8及对比例1-4制备的复合保湿布作为测试试样。
复合保湿布的使用:本实施例及对比例制备的复合保湿布的厚度均在2.3-2.4mm之间,直接采用满铺方式铺设,覆盖杂草即可,同时留出作物杆茎的生长空间;通过实验在杂草上覆盖本发明的除草保湿布。
抗撕裂测试:采用撕裂测试仪进行测试。
吸水率测试:将制备的干态的复合保湿布放置在80%湿度环境下,放置一周,根据保湿布吸水前的重量M0,吸水后的重量M1,两者的重量的变化,即吸水率=(M1-M0)/M0×100%,得出保湿布的吸水率。
保湿性测试:首先把80%湿度环境下充分润湿的保湿布,在温度为30℃,湿度为40%的环境下,放置15天,测试保湿布放置15天的重量m1,以及最初的重量m0,根据重量差变化,(m1-m0)/m0×100%得出复合保湿布的保湿性能。
抗老化测试:采用氙弧灯试验,照射时间1000h(累计辐射能量约3000MJ/m2),观察到保湿布表面无明显变化,仍然具备良好的保湿性和强度。
选取试验面积为4亩分隔为A、B、C三块分别为1亩的果园地,土质相同、位置相邻,杂草高度和健康状况与浇水相同,并且都是属于山地干旱以及除草不便的地方,其中1亩在栽种时使用实施例1-3制备的本产品,标记为A地,1亩不使用本产品,标记为B地,1亩使用实施例1-3制备的本产品,标记为C地,1亩不使用本产品,标记为D地,其中A地与C地18天内杂草开始变黄枯萎,并且不会再发芽生长,其中B地与D地杂草生长茂盛。
表1性能检测结果
结合实施例1和实施例4并结合表1可以看出,实施例1的各项性能明显优于实施例4,说明聚丙烯酸钠的吸水量过低,保湿布的吸水率和保湿率降低很多,因此,要保证聚丙烯酸钠具有高的吸水量。
结合实施例1和实施例5-6并结合表1可以看出,实施例1的各项性能明显优于实施例5和实施例6,PP再生料与PE再生料的配比影响保湿布的保湿性能和强度,实施例5的PE再生料含量相对多一些,由于PE再生料具有韧性,撕裂强度更高,但是如果PP再生料加入的量增加,保湿性能会随之降低。
结合实施例1和实施例7-8并结合表1可以看出,实施例1的各项性能明显优于实施例7和实施例8,超声压合的频率不够,使层与层之间连接的紧密性不够,其强度必然会下降,会产生部分缺陷使保湿布的保湿性能下降。
结合实施例1和对比例1-4并结合表1可以看出,对比例1不包括吸水材料,各试样的保水率和保湿性能下降很多,从对比例3可以看出原材料不包括聚丙烯酸钠和除草剂会部分影响保湿布的撕裂强度,这是因为中间层与复合无纺布层通过针刺复合,中间层原材料重量份数越多,其针刺之后的强度越高,对比例4将表层替换为PP无纺布,及没有添加PE再生料,PE再生料可以提高保湿布的韧性,因而其强度降低,并且PP无纺布的水分蒸发较多,进而吸水率和保湿性能下降。
本具体实施例仅仅是对本申请的解释,其并不是对本申请的限制,本领域技术人员在阅读完本说明书后可以根据需要对本实施例做出没有创造性贡献的修改,但只要在本申请的权利要求范围内都受到专利法的保护。
Claims (2)
1.一种复合保湿布,其特征在于:包括表层、中间层和底层,所述中间层与表层通过针刺复合,针刺复合完成后与底层通过超声波压合;
所述表层包括以下成分:PP再生料和PE再生料,所述PP再生料和PE再生料的重量比为(2-4):(5-8);
所述表层包括以下制备步骤:将PP再生料和PE再生料在260-280℃下纺成初生丝,所得的初生丝经4000-5000倍牵伸后经气流喷丝成丝细度为4-12dt的纤维网,将纤维网通过针刺加固得到复合无纺布;
所述中间层包括以下重量份数的原料:聚丙烯酸钠50-70份,1,1,-二甲基-4,4,联吡啶阳离子15-30份,所述聚丙烯酸钠的吸水量为自身重量的280-500倍;
所述中间层包括以下制备步骤:将聚丙烯酸钠在50-70℃下溶解于水中,得到质量浓度为40-65wt%的聚丙烯酸钠水溶液,然后加入1,1,-二甲基-4,4,联吡啶阳离子,搅拌混合均匀,在40-50℃下干燥24-48h,得到了吸附1,1,-二甲基-4,4,联吡啶阳离子的聚丙烯酸钠。
2.根据权利要求1所述的一种复合保湿布,其特征在于:所述底层为黑色的PP无纺布。
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