CN113337963B - 一种具有梯度结构的熔喷聚丙烯防护用非织造材料及其制备方法 - Google Patents
一种具有梯度结构的熔喷聚丙烯防护用非织造材料及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种具有梯度结构的熔喷聚丙烯防护用非织造材料及其制备方法,该方法包括:(1)对温度进行调控制备不同结构的熔喷PS‑PP非织造材料;(2)使用不同粒径的活性炭制备不同梯度含量的PS‑PP非织造布;(3)制备具有梯度结构的熔喷聚丙烯防护用非织造材料;本发明制备方法简单,操作方便,成本低,初始阻力低,容尘量大,过滤效率高,无污染等,在防护领域前景广阔。
Description
技术领域
本发明涉及非织造材料技术领域,尤其是涉及一种具有梯度结构的熔喷聚丙烯防护用非织造材料及其制备方法。
背景技术
研究发现新型冠状病毒(2019novel coronavirus,2019-nCoV)主要经呼吸道和接触传播,以聚集性传播尤为严重。因此,呼吸道防护是防控该疾病的关键之一,可减少二次传播的概率,而呼吸道防护的主要措施便是佩戴口罩。现有口罩主要采用聚丙烯材料。口罩内层采用针织涤盖棉,其吸湿性、透气透湿性好;外层是纺粘聚丙烯,起支撑作用;中间两层为负载活性炭的熔喷PS-PP非织造布。
PP具有质轻、原料来源丰富、性价比好以及优良的耐热性、耐化学腐蚀性、易于回收等优点。聚丙烯熔喷非织造布由超细纤维组成,其孔隙率高、孔径小、结构蓬松、纤维三维交错杂乱排列,使之具有很好的过滤性。熔喷非织造布可以通过电晕放电处理,有效增强其捕集微细尘埃、大颗粒的能力,是目前医用防护口罩的主要过滤材料。目前市面上的防护口罩虽然具有一定的防护能力,但其还是极为有限。
聚苯乙烯具有良好的综合性能,如热力学性能好、耐化学品性好、良好的耐磨性、电绝缘性优异以及韧性好等优点。
相比于利用胶粘剂胶粘活性炭,热压法可以避免其一些缺点,如胶粘剂会将一些活性炭颗粒的孔堵塞,降低过滤性能;胶粘的效率不高;胶粘剂容易对环境造成二次污染,且胶粘剂的制备工艺复杂,成本较高;小的活性炭颗粒会被胶粘剂包裹,较低使用性能。
发明内容
针对现有技术存在的上述问题,本发明申请人提供了一种具有梯度结构的熔喷聚丙烯防护用非织造材料及其制备方法。本发明制备的具有梯度结构的熔喷聚丙烯防护用非织造材料的方法简单,操作方便,成本低,初始阻力低,容尘量大,过滤效率高,无污染等特点。
本发明的技术方案如下:
一种具有梯度结构的熔喷聚丙烯防护用非织造材料,所述防护用非织造材料的制备方法包括如下步骤:
(1)制备熔喷PS-PP非织造材料;
将熔喷级聚丙烯切片和聚苯乙烯进行预混合,然后将预混好的料放入高速混合机中搅拌5-10min,使物料混合均匀;
然后将混合均匀的物料加入同向双螺杆挤出机中,在螺杆的推力作用下,以一定的温度和压力从喷丝头处挤出,经过冷却,牵伸成为丝状纤维,然后在成网装置上分丝、铺网,最后固结制得熔喷PS-PP非织造材料;
(2)制备不同梯度的PS-PP非织造布;
将步骤(1)制得的熔喷PS-PP非织造材料裁剪成一定大小,并将之平铺,之后将不同粒径的活性炭颗粒分别撒在不同或相同熔喷PS-PP非织造材料上表面,再用相同的熔喷PS-PP非织造材料铺在表面,使活性炭颗粒在处于两层之间,最后利用热压法处理获得所述非织造布;
(3)制备具有梯度结构的熔喷聚丙烯防护用非织造材料;
第一层选用的是针织涤盖棉面料,即里层;第二层与第三层是粒径不同或者熔融指数不同的PS-PP的非织造布;第四层是纺粘聚丙烯;每层之间通过超声波焊接法连接。
步骤(1)中,熔喷级聚丙烯切片的熔融指数为600-1000g/10min;聚苯乙烯的熔融指数为70g/10min。
步骤(1)中,熔喷级聚丙烯切片与聚苯乙烯的质量比为99-19:1。
步骤(1)中,高速混合机搅拌的转速为500-600r/min。
步骤(1)中,双螺杆挤出机从进料端到口模出口共有6个温控装置,在加工的过程中,温度依次设定为:一区180-190℃,二区190-210℃,三区210-230℃,四区230-240℃,五区230-250℃,六区190-200℃。
步骤(2)中,活性炭颗粒的粒径分别为600-800目、800-1000目、1000-1340目。
步骤(2)中,活性炭颗粒的用量为所裁剪材料质量的2%-4%。
步骤(2)中,热压法处理的热压温度为120-200℃,热压时间2.5-3h。
步骤(3)中,第一层厚度为0.2mm-0.8mm,第二、三层厚度为0.2-1.0mm,第四层厚度为0.2-0.4mm。
步骤(3)中,超声波焊接法的超声频率20-20kHZ,振幅60%,焊接压力0.6-0.7MPa,熔接时间0.4-0.6s。
本发明有益的技术效果在于:
本发明的制备方法简单,原料易得,对环境很友好。所制备的熔喷非织造布是梯度式的,相比于传统的熔喷非织造布,有更好的吸附过滤效果。呼吸时,最外层的纺粘层对外界气体中直径较大的颗粒进行过滤,接着第三层对气体中的细菌和病毒进行第一次过滤拦截,接着到达第二层,再次对细菌和病毒进行过滤拦截。二三层是不同梯度的熔喷非织造材料,活性炭颗粒在内部均匀分布,内部的孔隙由大变小,提高了孔隙率,从而提高了过滤效率。人体呼出的气体中含有大量的水分,这些水分会被针织涤盖棉吸收导到第二层。
本发明相比于将活性炭颗粒与聚合物切片混合之后所制备的熔喷非织造布,克服了活性炭颗粒难以控制粒径大小以及颗粒大部分分布在成品的内部的问题。
附图说明
图1为本发明示意图。
具体实施方式
下面结合附图和实施例,对本发明进行具体描述。
实施例1
一种具有梯度结构的熔喷聚丙烯防护用非织造材料,其制备方法包括如下步骤:
(1)制备熔喷PS-PP非织造材料:
将质量百分比为95%的熔喷级聚丙烯切片(熔融指数为600g/10min)与质量百分比为5%的聚苯乙烯(熔融指数为70g/10min)进行预混合,然后将预混好的料放入高速搅拌机中500r/min下搅拌5min,使物料充分混合均匀;
然后将混合均匀的物料加入同向双螺杆挤出机中,通过加热装置提供的热能、螺杆本身在转动过程中产生的剪切热,以及原料自身不断被挤压和相互产生摩擦带来的升温,使原料由最初的固态转变为高弹态,到最终熔融为粘流态的聚合物熔体,在螺杆的推力作用下,以一定的温度和压力从喷丝头处挤出,经过冷却,牵伸成为丝状纤维,然后在成网装置上分丝、铺网,最后固结制得熔喷PS-PP非织造材料;
双螺杆挤出机从进料端到口模出口共有6个温控装置,在加工的过程中,温度依次设定为:一区180℃,二区190℃,三区210℃,四区230℃,五区230℃,六区190℃。
(2)制备不同梯度的PS-PP非织造布
将制备的熔喷PS-PP非织造材料裁剪成一定大小,并将之平铺,之后将粒径为600-800目(23-18μm)、1000-1340目(13-10μm)的活性炭颗粒分别均匀的撒在熔喷PS-PP非织造材料(用量为所裁剪材料质量的2%),再用相同的熔喷PS-PP非织造材料铺在表面,使活性炭颗粒在处于两层之间。最后利用热压法处理(热压温度为120℃,热压时间2.5h)获得所述非织造布。
利用标准筛配合标准振筛机将选用的活性炭颗粒分别进行三次收集,600-800目(23-18μm),800-1000目(18-13μm),1000-1340目(13-10μm);
(3)制备具有梯度结构的熔喷聚丙烯防护用非织造材料
第一层选用的是针织涤盖棉面料(里层),厚度为0.2mm,第二层是600-800目(23-18μm)活性炭颗粒所制备的非织造布,厚度为0.2mm,第三层是1000-1340目(13-10μ)活性炭颗粒所制备的非织造布,厚度为0.2mm,第四层是纺粘聚丙烯,厚度为0.2mm;每层之间通过超声波焊接法连接,制得所述具有梯度结构的熔喷聚丙烯防护用非织造材料。
超声波焊接法的超声频率20kHZ,振幅60%,焊接压力0.6MPa,熔接时间0.4s。
实施例2
一种具有梯度结构的熔喷聚丙烯防护用非织造材料,其制备方法包括如下步骤:
(1)制备熔喷PS-PP非织造材料:
将质量百分比为95%的熔喷级聚丙烯切片(熔融指数为800g/10min)与质量百分比为5%的聚苯乙烯(熔融指数为70g/10min)进行预混合,然后将预混好的料放入高速搅拌机中550r/min下搅拌7.5min,使物料充分混合均匀;
然后将混合均匀的物料加入同向双螺杆挤出机中,通过加热装置提供的热能、螺杆本身在转动过程中产生的剪切热,以及原料自身不断被挤压和相互产生摩擦带来的升温,使原料由最初的固态转变为高弹态,到最终熔融为粘流态的聚合物熔体,在螺杆的推力作用下,以一定的温度和压力从喷丝头处挤出,经过冷却,牵伸成为丝状纤维,然后在成网装置上分丝、铺网,最后固结制得熔喷PS-PP非织造材料;
双螺杆挤出机从进料端到口模出口共有6个温控装置,在加工的过程中,温度依次设定为:一区185℃,二区200℃,三区220℃,四区235℃,五区240℃,六区195℃。
(2)制备不同梯度的PS-PP非织造布
将制备的熔喷PS-PP非织造材料裁剪成一定大小,并将之平铺,之后将粒径为600-800目(23-18μm)、1000-1340目(13-10μm)的活性炭颗粒分别均匀的撒在熔喷PS-PP非织造材料(用量为所裁剪材料质量的3%),再用相同的熔喷PS-PP非织造材料铺在表面,使活性炭颗粒在处于两层之间。最后利用热压法处理(热压温度为160℃,热压时间2.75h)获得所述非织造布。
利用标准筛配合标准振筛机将选用的活性炭颗粒分别进行三次收集,600-800目(23-18μm),800-1000目(18-13μm),1000-1340目(13-10μm);
(3)制备具有梯度结构的熔喷聚丙烯防护用非织造材料
第一层选用的是针织涤盖棉面料(里层),厚度为0.5mm,第二层是600-800目(23-18μm)活性炭颗粒所制备的非织造布,厚度为0.6mm,第三层是1000-1340目(13-10μ)活性炭颗粒所制备的非织造布,厚度为0.6mm,第四层是纺粘聚丙烯,厚度为0.3mm;每层之间通过超声波焊接法连接,制得所述具有梯度结构的熔喷聚丙烯防护用非织造材料。
超声波焊接法的超声频率25kHZ,振幅60%,焊接压力0.65MPa,熔接时间0.5s。
实施例3
一种具有梯度结构的熔喷聚丙烯防护用非织造材料,其制备方法包括如下步骤:
(1)制备熔喷PS-PP非织造材料:
将质量百分比为95%的熔喷级聚丙烯切片(熔融指数为1000g/10min)与质量百分比为5%的聚苯乙烯(熔融指数为70g/10min)进行预混合,然后将预混好的料放入高速搅拌机中600r/min下搅拌10min,使物料充分混合均匀;
然后将混合均匀的物料加入同向双螺杆挤出机中,通过加热装置提供的热能、螺杆本身在转动过程中产生的剪切热,以及原料自身不断被挤压和相互产生摩擦带来的升温,使原料由最初的固态转变为高弹态,到最终熔融为粘流态的聚合物熔体,在螺杆的推力作用下,以一定的温度和压力从喷丝头处挤出,经过冷却,牵伸成为丝状纤维,然后在成网装置上分丝、铺网,最后固结制得熔喷PS-PP非织造材料;
双螺杆挤出机从进料端到口模出口共有6个温控装置,在加工的过程中,温度依次设定为:一区190℃,二区210℃,三区230℃,四区240℃,五区250℃,六区200℃。
(2)制备不同梯度的PS-PP非织造布
将制备的熔喷PS-PP非织造材料裁剪成一定大小,并将之平铺,之后将粒径为600-800目(23-18μm)、1000-1340目(13-10μm)的活性炭颗粒分别均匀的撒在熔喷PS-PP非织造材料(用量为所裁剪材料质量的4%),再用相同的熔喷PS-PP非织造材料铺在表面,使活性炭颗粒在处于两层之间。最后利用热压法处理(热压温度为200℃,热压时间3h)获得所述非织造布。
利用标准筛配合标准振筛机将选用的活性炭颗粒分别进行三次收集,600-800目(23-18μm),800-1000目(18-13μm),1000-1340目(13-10μm);
(3)制备具有梯度结构的熔喷聚丙烯防护用非织造材料
第一层选用的是针织涤盖棉面料(里层),厚度为0.8mm,第二层是600-800目(23-18μm)活性炭颗粒所制备的非织造布,厚度为1.0mm,第三层是1000-1340目(13-10μ)活性炭颗粒所制备的非织造布,厚度为1.0mm,第四层是纺粘聚丙烯,厚度为0.4mm;每层之间通过超声波焊接法连接,制得所述具有梯度结构的熔喷聚丙烯防护用非织造材料。
超声波焊接法的超声频率30kHZ,振幅60%,焊接压力0.7MPa,熔接时间0.6s。
实施例4
一种具有梯度结构的熔喷聚丙烯防护用非织造材料,其制备方法包括如下步骤:
(1)制备熔喷PS-PP非织造材料:
将质量百分比为95%的熔喷级聚丙烯切片(熔融指数为600g/10min)与质量百分比为5%的聚苯乙烯(熔融指数为70g/10min)进行预混合,然后将预混好的料放入高速搅拌机中500r/min下搅拌5min,使物料充分混合均匀;
然后将混合均匀的物料加入同向双螺杆挤出机中,通过加热装置提供的热能、螺杆本身在转动过程中产生的剪切热,以及原料自身不断被挤压和相互产生摩擦带来的升温,使原料由最初的固态转变为高弹态,到最终熔融为粘流态的聚合物熔体,在螺杆的推力作用下,以一定的温度和压力从喷丝头处挤出,经过冷却,牵伸成为丝状纤维,然后在成网装置上分丝、铺网,最后固结制得熔喷PS-PP非织造材料;
双螺杆挤出机从进料端到口模出口共有6个温控装置,在加工的过程中,温度依次设定为:一区180℃,二区190℃,三区210℃,四区230℃,五区230℃,六区190℃。
(2)制备不同梯度的PS-PP非织造布
将制备的熔喷PS-PP非织造材料裁剪成一定大小,并将之平铺,之后将粒径为800-1000目(18-13μm)、1000-1340目(13-10μm)的活性炭颗粒分别均匀的撒在熔喷PS-PP非织造材料(用量为所裁剪材料质量的2%),再用相同的熔喷PS-PP非织造材料铺在表面,使活性炭颗粒在处于两层之间。最后利用热压法处理(热压温度为120℃,热压时间2.5h)获得所述非织造布。
利用标准筛配合标准振筛机将选用的活性炭颗粒分别进行三次收集,600-800目(23-18μm),800-1000目(18-13μm),1000-1340目(13-10μm);
(3)制备具有梯度结构的熔喷聚丙烯防护用非织造材料
第一层选用的是针织涤盖棉面料(里层),厚度为0.2mm,第二层是800-1000目(18-13μm)活性炭颗粒所制备的非织造布,厚度为0.2mm,第三层是1000-1340目(13-10μ)活性炭颗粒所制备的非织造布,厚度为0.2mm,第四层是纺粘聚丙烯,厚度为0.2mm;每层之间通过超声波焊接法连接,制得所述具有梯度结构的熔喷聚丙烯防护用非织造材料。
超声波焊接法的超声频率20kHZ,振幅60%,焊接压力0.6MPa,熔接时间0.4s。
实施例5
一种具有梯度结构的熔喷聚丙烯防护用非织造材料,其制备方法包括如下步骤:
(1)制备熔喷PS-PP非织造材料:
将质量百分比为95%的熔喷级聚丙烯切片(熔融指数为800g/10min)与质量百分比为5%的聚苯乙烯(熔融指数为70g/10min)进行预混合,然后将预混好的料放入高速搅拌机中550r/min下搅拌7.5min,使物料充分混合均匀;
然后将混合均匀的物料加入同向双螺杆挤出机中,通过加热装置提供的热能、螺杆本身在转动过程中产生的剪切热,以及原料自身不断被挤压和相互产生摩擦带来的升温,使原料由最初的固态转变为高弹态,到最终熔融为粘流态的聚合物熔体,在螺杆的推力作用下,以一定的温度和压力从喷丝头处挤出,经过冷却,牵伸成为丝状纤维,然后在成网装置上分丝、铺网,最后固结制得熔喷PS-PP非织造材料;
双螺杆挤出机从进料端到口模出口共有6个温控装置,在加工的过程中,温度依次设定为:一区185℃,二区200℃,三区220℃,四区235℃,五区240℃,六区195℃。
(2)制备不同梯度的PS-PP非织造布
将制备的熔喷PS-PP非织造材料裁剪成一定大小,并将之平铺,之后将粒径为800-1000目(18-13μm)、1000-1340目(13-10μm)的活性炭颗粒分别均匀的撒在熔喷PS-PP非织造材料(用量为所裁剪材料质量的3%),再用相同的熔喷PS-PP非织造材料铺在表面,使活性炭颗粒在处于两层之间。最后利用热压法处理(热压温度为160℃,热压时间2.75h)获得所述非织造布。
利用标准筛配合标准振筛机将选用的活性炭颗粒分别进行三次收集,600-800目(23-18μm),800-1000目(18-13μm),1000-1340目(13-10μm);
(3)制备具有梯度结构的熔喷聚丙烯防护用非织造材料
第一层选用的是针织涤盖棉面料(里层),厚度为0.5mm,第二层是800-1000目(18-13μm)活性炭颗粒所制备的非织造布,厚度为0.6mm,第三层是1000-1340目(13-10μ)活性炭颗粒所制备的非织造布,厚度为0.6mm,第四层是纺粘聚丙烯,厚度为0.3mm;每层之间通过超声波焊接法连接,制得所述具有梯度结构的熔喷聚丙烯防护用非织造材料。
超声波焊接法的超声频率25kHZ,振幅60%,焊接压力0.65MPa,熔接时间0.5s。
实施例6
一种具有梯度结构的熔喷聚丙烯防护用非织造材料,其制备方法包括如下步骤:
(1)制备熔喷PS-PP非织造材料:
将质量百分比为95%的熔喷级聚丙烯切片(熔融指数为1000g/10min)与质量百分比为5%的聚苯乙烯(熔融指数为70g/10min)进行预混合,然后将预混好的料放入高速搅拌机中600r/min下搅拌10min,使物料充分混合均匀;
然后将混合均匀的物料加入同向双螺杆挤出机中,通过加热装置提供的热能、螺杆本身在转动过程中产生的剪切热,以及原料自身不断被挤压和相互产生摩擦带来的升温,使原料由最初的固态转变为高弹态,到最终熔融为粘流态的聚合物熔体,在螺杆的推力作用下,以一定的温度和压力从喷丝头处挤出,经过冷却,牵伸成为丝状纤维,然后在成网装置上分丝、铺网,最后固结制得熔喷PS-PP非织造材料;
双螺杆挤出机从进料端到口模出口共有6个温控装置,在加工的过程中,温度依次设定为:一区190℃,二区210℃,三区230℃,四区240℃,五区250℃,六区200℃。
(2)制备不同梯度的PS-PP非织造布
将制备的熔喷PS-PP非织造材料裁剪成一定大小,并将之平铺,之后将粒径为800-1000目(18-13μm)、1000-1340目(13-10μm)的活性炭颗粒分别均匀的撒在熔喷PS-PP非织造材料(用量为所裁剪材料质量的4%),再用相同的熔喷PS-PP非织造材料铺在表面,使活性炭颗粒在处于两层之间。最后利用热压法处理(热压温度为200℃,热压时间3h)获得所述非织造布。
利用标准筛配合标准振筛机将选用的活性炭颗粒分别进行三次收集,600-800目(23-18μm),800-1000目(18-13μm),1000-1340目(13-10μm);
(3)制备具有梯度结构的熔喷聚丙烯防护用非织造材料
第一层选用的是针织涤盖棉面料(里层),厚度为0.8mm,第二层是800-1000目(18-13μm)活性炭颗粒所制备的非织造布,厚度为1.0mm,第三层是1000-1340目(13-10μ)活性炭颗粒所制备的非织造布,厚度为1.0mm,第四层是纺粘聚丙烯,厚度为0.4mm;每层之间通过超声波焊接法连接,制得所述具有梯度结构的熔喷聚丙烯防护用非织造材料。
超声波焊接法的超声频率30kHZ,振幅60%,焊接压力0.7MPa,熔接时间0.6s。
对比例:
从市场上选购了一种活性炭口罩,利用CEM四合一粒子计数器DT-9880M对PM2.5的浓度进行检测,其测试的过滤效率大约在60%-80%之间,取测试10次的平均值74.6%;利用美国PMI公司生产的多孔材料孔径分析仪测试材料的孔体积,同样取其平均值1.56cm3/g。
测试例:
将本发明制备防护用非织造材料与标准的防护用非织造材料进行检测。利用CEM四合一粒子计数器DT-9880M对PM2.5的浓度进行检测;利用美国PMI公司生产的多孔材料孔径分析仪测试材料的孔体积。测试结果如下表1所示。
表1
Claims (5)
1.一种具有梯度结构的熔喷聚丙烯防护用非织造材料的制备方法,其特征在于,所述防护用非织造材料的制备方法包括如下步骤:
(1)制备熔喷PS-PP非织造材料;
将熔喷级聚丙烯切片和聚苯乙烯进行预混合,然后将预混好的料放入高速混合机中搅拌5-10min,使物料混合均匀;熔喷级聚丙烯切片与聚苯乙烯的质量比为99-19:1;
然后将混合均匀的物料加入同向双螺杆挤出机中,在螺杆的推力作用下,以一定的温度和压力从喷丝头处挤出,经过冷却,牵伸成为丝状纤维,然后在成网装置上分丝、铺网,最后固结制得熔喷PS-PP非织造材料;
(2)制备不同梯度的PS-PP非织造布;
将步骤(1)制得的熔喷PS-PP非织造材料裁剪成一定大小,并将之平铺,之后将不同粒径的活性炭颗粒分别撒在熔喷PS-PP非织造材料上表面,再用相同的熔喷PS-PP非织造材料铺在表面,使活性炭颗粒在处于两层之间,最后利用热压法处理获得所述非织造布;
活性炭颗粒的用量为所裁剪材料质量的2%-4%;活性炭颗粒的粒径分别为600-800目、800-1000目、1000-1340目;
(3)制备具有梯度结构的熔喷聚丙烯防护用非织造材料;
第一层选用的是针织涤盖棉面料,即里层;
第二层是600-800目活性炭颗粒所制备的非织造布或800-1000目活性炭颗粒所制备的非织造布;
第三层是1000-1340目活性炭颗粒所制备的非织造布;
第四层是纺粘聚丙烯;每层之间通过超声波焊接法连接;第一层厚度为0.2mm-0.8mm,第二、三层厚度为0.2-1.0mm,第四层厚度为0.2-0.4mm;
超声波焊接法的超声频率20-30kHZ,振幅60%,焊接压力0.6-0.7MPa,熔接时间0.4-0.6s。
2.根据权利要求1所述的防护用非织造材料的制备方法,其特征在于,步骤(1)中,熔喷级聚丙烯切片的熔融指数为600-1000g/10min;聚苯乙烯的熔融指数为70g/10min。
3.根据权利要求1所述的防护用非织造材料的制备方法,其特征在于,步骤(1)中,高速混合机搅拌的转速为500-600r/min。
4.根据权利要求1所述的防护用非织造材料的制备方法,其特征在于,步骤(1)中,双螺杆挤出机从进料端到口模出口共有6个温控装置,在加工的过程中,温度依次设定为:一区180-190℃,二区190-210℃,三区210-230℃,四区230-240℃,五区230-250℃,六区190-200℃。
5.根据权利要求1所述的防护用非织造材料的制备方法,其特征在于,步骤(2)中,热压法处理的热压温度为120-200℃,热压时间2.5-3h。
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