CN112111052A - 一种pet扁丝的原料配方及其制备方法 - Google Patents
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Abstract
本发明公开了一种PET扁丝的原料配方及其制备方法,通过共聚改性,使得改性聚酯PET扁丝具有较好的韧性,标准样条的悬臂梁缺口冲击强度相比改性前提高50%以上,满足后道编织、簇绒加工工艺的要求,解决了纯PET扁丝生产时存在的发脆,韧性差,容易断裂,拉出的扁丝强度不够等问题,产品性能均匀性大幅提高,且制得的PET扁丝拉伸强度≥400Mpa,断裂伸长率≥20%,可应用于对强度、耐候性、温度等使用条件要求高的编织物的生产。
Description
技术领域:
本发明属于高分子材料加工领域领域,特别涉及一种PET扁丝的原料配方及其制备方法。
背景技术:
目前国内外使用的塑料扁丝,绝大多数是以PP为原料进行制造,然后编织成相应编织物如编织袋、地毯基布等进行后道应用。然而PP由于本身结构的特点决定了其主要存在以下缺陷:1、耐候性差、易氧化,在存放过程中编织袋的机械强度,尤其是抗冲击强度大幅降低,影响包装效果。2、PP熔点较低164-170℃,无法满足后道高温加工的要求,如在生产簇绒地毯的背胶工序中加工温度在160℃左右,接近PP的熔点,加工过程PP基布容易变形,导致产品废品量增加,因此PP材质基布在加工此类产品时受到了限制。
PET的力学性能、耐高低温性能、耐候性能等均比PP要好。但是由于PET分子刚性较大,强度高,在PET拉丝的过程中存在发脆,韧性差,容易断裂,拉出的扁丝强度不够等问题。为了解决PET拉丝时存在的以上问题,现有技术主要是通过在螺杆熔融挤出段共混添加一定量聚烯烃类增韧剂、相容剂,及一定量的碳酸钙、滑石粉、钛白粉、蒙脱土、二氧化硅等无机类填充剂,但通过添加助剂的方式存在加入量受限、混合不均匀等问题,且助剂添加后对加工工艺、产品性能极其稳定性均会产生影响。
公开于该背景技术部分的信息仅仅旨在增加对本发明的总体背景的理解,而不应当被视为承认或以任何形式暗示该信息构成已为本领域一般技术人员所公知的现有技术。
发明内容:
本发明的目的在于提供一种PET扁丝的原料配方,从而克服上述现有技术中的缺陷。为实现上述目的,本发明提供了一种PET扁丝的原料配方, 其特征在于:由对苯二甲酸PTA、乙二醇EG、葵二酸SA和1,4-环己烷二甲醇CHDM组成, 原料配比以对苯二甲酸PTA 1mol为基准,乙二醇EG添加量1.5mol,葵二酸SA添加量0.05-0.35mol,1,4-环己烷二甲醇CHDM添加量0.06-0.15mol。
本发明进一步限定的技术方案为:
进一步的,还包括添加至少一种其它多元醇或多元酸进行共聚,其它多元酸、多元醇包括16-羟基棕榈酸HHA、1,6己二醇HG、相对分子质量4000的聚乙二醇PEG;原料配比以对苯二甲酸PTA 1mol为基准,16-羟基棕榈酸HHA添加量0.01-0.04mol,相对分子质量4000的聚乙二醇PEG添加量0.0025-0.005mol,1,6己二醇HG添加量0.15-0.225mol。
一种PET扁丝的制备方法,按照如下步骤进行:
S1,对苯二甲酸PTA、葵二酸SA、1,4-环己烷二甲醇CHDM、乙二醇EG在催化剂的催化下经酯化反应、缩聚反应得到一定特性粘度的PET聚酯切片,其中酯化温度255℃~265℃,压力0.2-0.3MPa;缩聚温度280℃~283℃,压力≤60Pa;达到一定时间后出料,经切粒、干燥,制得PET共聚酯切片;
S2,PET共聚酯切片干燥后经螺杆挤出机熔融挤出得到熔体,螺杆温度250-285℃,熔体经50-60℃急冷辊冷却得到铸片;
S3,铸片分切后经75-90℃预热,进行单向一级或二级拉伸,拉伸温度95-105℃,拉伸比5-6,然后在160-200℃下热定型,定型后收卷得到PET扁丝样品。
本发明进一步限定的技术方案为:
进一步的,步骤S1最后得到的PET共聚酯切片的特性粘度0.640-0.80dL/g。
进一步的,步骤S1中,所用催化剂为乙二醇锑、醋酸锑、三氧化二锑等催化剂,相比PET质量,添加量以Sb原子计180ppm,添加位置酯化前酯化后均可。
进一步的,步骤S3最后得到的PET扁丝样品具体参数为:PET扁丝宽度≤2.5mm,厚度≤50μm,单丝拉伸强度≥400Mpa,断裂伸长率≥20%,缺口冲击强度4.4-5.2 kJ/m2。
本发明的有益效果为:本发明通过共聚改性,使得改性聚酯PET扁丝具有较好的韧性,满足稳定加工的要求,解决了纯PET扁丝生产时存在的发脆,韧性差,容易断裂,拉出的扁丝强度不够等问题,挤出时无需额外添加其它助剂,产品性能均匀性大幅提高,且制得的PET扁丝拉伸强度≥400Mpa,断裂伸长率≥20%,可应用于对强度、耐候性、温度等使用条件要求高的编织物的生产。
具体实施方式:
下面对本发明的具体实施方式进行详细描述,但应当理解本发明的保护范围并不受具体实施方式的限制。
除非另有其它明确表示,否则在整个说明书和权利要求书中,术语“包括”或其变换如“包含”或“包括有”等等将被理解为包括所陈述的元件或组成部分,而并未排除其它元件或其它组成部分。
本发明所述一种PET扁丝的原料配方及其制备方法,首先进行PET共聚酯的制备,然后进行PET扁丝的制备,主要包括以下步骤:
实施例1:PET共聚酯的制备:将1mol的PTA、1.5mol的EG、0.15mol的SA、0.2mol的CHDM投入到150L间歇聚合反应釜,并加入180ppm的乙二醇锑(以Sb原子计,相对于聚酯PET)作为催化剂,升温进行酯化反应,酯化温度255℃~265℃,压力0.2-0.3MPa,酯化结束泄压后继续升温进行缩聚反应,缩聚温度280℃~283℃,压力≤60Pa,达到一定时间后出料,经切粒、干燥,制得PET共聚酯切片,所得共聚酯特性粘度0.75-0.8dL/g。
PET扁丝的制备:将上述制备的PET共聚酯经155℃真空烘箱干燥后经螺杆挤出机熔融挤出得到熔体,螺杆温度250-285℃,熔体经60℃急冷辊冷却得到铸片,铸片分切后经导辊牵引后进入纵向拉伸机,经90℃预热后,进行单向二级拉伸,拉伸温度105℃,总拉伸倍率为5-6倍,然后在160℃下热定型,最后收卷得到PET扁丝成品,所得PET扁丝单丝拉伸强度550-600Mpa,断裂伸长率15-25%。
实施例2:PET共聚酯制备及PET扁丝的制备工艺与实施例1相同,所不同的是PET共聚酯制备过程加入0.25mol的SA、0.15mol的CHDM,所得共聚酯特性粘度0.70-0.75dL/g;PET扁丝制备过程预热温度80℃,拉伸温度100℃,总拉伸倍率为5-6倍,然后在170℃下热定型,最后收卷得到PET扁丝成品,所得PET扁丝单丝拉伸强度500-550Mpa,断裂伸长率20-25%。
实施例3:PET共聚酯制备及PET扁丝的制备工艺与实施例1相同,所不同的是PET共聚酯制备过程加入0.35mol的SA、0.1mol的CHDM,所得共聚酯特性粘度0.64-0.70dL/g;PET扁丝制备过程预热温度75℃,拉伸温度95℃,总拉伸倍率为5-6倍,然后在180℃下热定型,最后收卷得到PET扁丝成品,所得PET扁丝单丝拉伸强度400-500Mpa,断裂伸长率20-30%。
实施例4:PET共聚酯制备及PET扁丝的制备工艺与实施例1相同,所不同的是PET共聚酯制备过程加入0.04mol的HHA,所得共聚酯特性粘度0.64-0.70dL/g; PET扁丝制备过程预热温度75℃,拉伸温度95℃,总拉伸倍率为5-6倍,然后在170℃下热定型,最后收卷得到PET扁丝成品,所得PET扁丝单丝拉伸强度400-500Mpa,断裂伸长率20-30%。
实施例5:PET共聚酯制备及PET扁丝的制备工艺与实施例1相同,所不同的是PET共聚酯制备过程加入0.01mol的HHA、0.0025mol的PEG、0.15mol的HG,所得共聚酯特性粘度0.64-0.70dL/g;PET扁丝制备过程预热温度75℃,拉伸温度95℃,总拉伸倍率为5-6倍,然后在200℃下热定型,最后收卷得到PET扁丝成品,所得PET扁丝单丝拉伸强度400-500Mpa,断裂伸长率20-30%。
实施例6:PET共聚酯制备及PET扁丝的制备工艺与实施例2相同,所不同的是PET共聚酯制备过程加入0.005mol的PEG,定型温度175℃,所得PET扁丝单丝拉伸强度400-450Mpa,断裂伸长率20-25%。
实施例7:PET共聚酯制备及PET扁丝的制备工艺与实施例2相同,所不同的是PET共聚酯制备过程加入0.225mol的HG,定型温度180℃,所得PET扁丝单丝拉伸强度400-450Mpa,断裂伸长率20-25%。
实施例8:PET共聚酯制备及PET扁丝的制备工艺与实施例3相同,所不同的是PET共聚酯制备过程加入0.01mol的HHA、0.15mol的HG,定型温度190℃,所得PET扁丝单丝拉伸强度400-450Mpa,断裂伸长率20-25%。
实施例9:PET共聚酯制备及PET扁丝的制备工艺与实施例3相同,所不同的是PET共聚酯制备过程加入0.01mol的HHA、0.0025mol的PEG,定型温度195℃,所得PET扁丝单丝拉伸强度400-450Mpa,断裂伸长率20-25%。
下表为标准样条悬臂梁缺口冲击强度对比表:
项目 | 缺口冲击强度(kJ/m<sup>2</sup>) |
对比例 | 2.8 |
实施例一 | 4.4 |
实施例二 | 4.5 |
实施例三 | 4.8 |
实施例四 | 4.5 |
实施例五 | 4.9 |
实施例六 | 5.0 |
实施例七 | 4.7 |
实施例八 | 5.0 |
实施例九 | 5.2 |
备注:对比例为纯聚酯PET,仅用PTA与EG进行聚合,未添加其它第三单体进行改性,所得纯PET聚酯由于分子链刚性大,使产品脆性大,无法进行正常稳定的分切、编织、簇绒等后道加工工序。
前述对本发明的具体示例性实施方案的描述是为了说明和例证的目的。这些描述并非想将本发明限定为所公开的精确形式,并且很显然,根据上述教导,可以进行很多改变和变化。对示例性实施例进行选择和描述的目的在于解释本发明的特定原理及其实际应用,从而使得本领域的技术人员能够实现并利用本发明的各种不同的示例性实施方案以及各种不同的选择和改变。本发明的范围意在由权利要求书及其等同形式所限定。
Claims (6)
1.一种PET扁丝的原料配方, 其特征在于:由对苯二甲酸PTA、乙二醇EG、葵二酸SA和1,4-环己烷二甲醇CHDM组成, 原料配比以对苯二甲酸PTA 1mol为基准,乙二醇EG添加量1.5mol,葵二酸SA添加量0.05-0.35mol,1,4-环己烷二甲醇CHDM添加量0.06-0.15mol。
2.根据权利要求1所述的PET扁丝的原料配方,其特征在于:还包括添加至少一种其它多元醇或多元酸进行共聚,所述其它多元酸、多元醇选自16-羟基棕榈酸HHA、1,6己二醇HG、相对分子质量4000的聚乙二醇PEG中的一种或两种;原料配比以对苯二甲酸PTA 1mol为基准,16-羟基棕榈酸HHA添加量0.01-0.04mol,相对分子质量4000的聚乙二醇PEG添加量0.0025-0.005mol,1,6己二醇HG添加量0.15-0.225mol。
3.一种PET扁丝的制备方法,其特征在于:按照如下步骤进行:
S1,对苯二甲酸PTA、葵二酸SA、1,4-环己烷二甲醇CHDM、乙二醇EG在催化剂的催化下经酯化反应、缩聚反应得到一定特性粘度的PET聚酯切片,其中酯化温度255℃~265℃,压力0.2-0.3MPa;缩聚温度280℃~283℃,压力≤60Pa;达到一定时间后出料,经切粒、干燥,制得PET共聚酯切片;
S2,PET共聚酯切片干燥后经螺杆挤出机熔融挤出得到熔体,螺杆温度250-285℃,熔体经50-60℃急冷辊冷却得到铸片;
S3,铸片分切后经75-90℃预热,进行单向一级或二级拉伸,拉伸温度95-105℃,拉伸比5-6,然后在160-200℃下热定型,定型后收卷得到PET扁丝样品。
4.根据权利要求3所述的PET扁丝的制备方法,其特征在于:步骤S1最后得到的PET共聚酯切片的特性粘度0.640-0.80dL/g。
5.根据权利要求3所述的PET扁丝的制备方法,其特征在于:步骤S1中,所用催化剂为乙二醇锑、醋酸锑、三氧化二锑等催化剂,相比PET质量,添加量以Sb原子计180ppm,添加位置酯化前酯化后均可。
6.根据权利要求3所述的PET扁丝的制备方法,其特征在于:步骤S3最后得到的PET扁丝样品具体参数为:PET扁丝宽度≤2.5mm,厚度≤50μm,单丝拉伸强度≥400Mpa,断裂伸长率≥20%,缺口冲击强度4.4-5.2 kJ/m2。
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