CN1166189A - 具有生物降解性的水解性纸材 - Google Patents
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Abstract
本发明涉及具有生物降解性的水解性纸材,该纸材含有1种或2种以上的生物降解性合成纤维和1种或2种以上的天然纤维及/或再生纤维,这些纤维靠在水中粘合力实质上消失的粘合剂粘合在一起。该纸材具备一定的拉伸强度和良好的柔软性以及所必须的吸液性,而且还具有所需的生物降解性。因此,不会造成从水洗厕所流出后在净化槽及排水处理设施里固形残留成分的显著增加,所以特别适合作为湿型纸巾使用。
Description
本发明涉及一种具有生物降解性的水解性纸材(sheet),该纸材可以用作以擦拭厕所为代表的器皿擦拭用的湿型擦拭纸巾(wet wiper)、以臂部擦拭为代表的人体擦拭用的湿型擦拭纸巾,可以在水洗厕所里进行废弃处理,并且手感(柔软性)优良。
冲入水洗厕所后能够进行处理的纸巾,其材料是针叶树纸浆通过水溶性粘合剂(CMC、PVA)粘合形成的水解纸。现在提供该技术的提案很多(日本特开平2-154095号公报、日本特开平2-229295号公报、日本特开平3-167400号公报等)。还有,关于用该纸巾材料的湿型纸巾,在日本特开平2-149237号公报、日本特开平3-182218号公报、日本特开平3-292924号公报中公布了很多技术。
该种水解纸及用其制的湿型纸巾,存在的缺点是:由于主要材料是针叶树纸浆,所以期待着经水洗厕所流出后,能在净化槽或排水处理设施里进行良好的微生物处理。但是,用针叶树纸浆制的纸材就是我们一般称的纸,比合成纤维无纺布要硬。在接触手和皮肤时会产生手感不好的印象。另外,亲水性和吸水性虽然优良,但在吸水状态下,纤维自身的回弹性消失,给皮肤带来不好的触感,同时湿型纸巾自身的柔软性也会被破坏。
另一方面,众所周知,不能水冲处理的湿型纸巾采用的是含有合成纤维(PE、PP、PET)的湿式无纺布技术。但是,尽管用合成纤维无纺布作湿型纸巾及卫生材料等时比纸柔软、手感也优良,但不能在净化槽或排水处理设施里进行生物降解处理,所以会带来固形残留成分增加的基本问题。
因此,最近,日本特开平7-70896号公报里公布了采用生物降解性纤维制造可以经水洗处理的纸巾技术。但是,该特开平7-70896号公报里公开的是仅用生物降解性合成纤维和粘合剂构成的纸材,因此不能满足湿型擦拭纸巾所必须的吸液性。并且,与现有的仅用纸浆和粘合剂制的纸材相比较,拉伸强度显著不好,制品的强度不足是其存在的问题。
本发明的目的是解决上述的问题点,提供一种具有生物降解性的纸材,该纸材具有一定的拉伸强度和良好的柔软性以及所必须的吸液性,而且具备所需的生物降解性,经水洗厕所流出后,不会造成净化槽和排水处理设施中固形残留成分显著增加,因此特别适用于湿型纸巾。
本发明中具有生物降解性的水解性纸材中含有1种或2种以上的生物降解性合成纤维和1种或2种以上的天然纤维及/或再生纤维,利用在水中粘合力实质上消失的粘合剂把上述纤维结合在一起。
本发明中,将疏水性的生物降解合成纤维与天然纤维及/或再生纤维以最适当的量混合,不仅不会失去一定的吸液性,同时可以维持吸液时的膨松性和柔软性,提供特别适合湿型纸巾的优良性能。另外,本发明中是将该生物降解性的合成纤维与天然纤维及/或再生纤维利用在水中粘合力实质上消失的粘合剂结合在一起的,所以使用后可以扔弃在水洗厕所里。生物降解性纤维和天然纤维及/或再生纤维立即呈分散的分离状态,同时,在净化槽或排水设施里能够生物降解,所以不会造成固形残留成分显著增加。
本发明中,构成生物降解性合成纤维的热塑性聚合物,一般采用疏水性脂肪族聚酯类聚合物为宜。作为脂肪族聚酯类聚合物可以列举的如:聚乙二醇酸、聚乳酸类的聚(α-羟基酸)以及由构成上述物质的重复单元构成的共聚物。还可以列举的有,(i)聚(ε-辛内脂)、聚(β-丙酸内酯)类的聚(ω-羟基链烷酸酯),同时还可以列举的有:(ii)聚-3-羟基丙酸酯、聚-3-羟基丁酸酯、聚-3-羟基己酸酯、聚-3-羟基庚酸酯、聚-3-羟基辛酸酯类的聚(β-羟基链烷酸酯),进一步可以列举的有:(iii)构成上述物质的重复单元与构成聚-3-羟基戊酸酯、聚-4-羟基丁酸酯的重复单元的聚合物。另外,可以列举的乙二醇与二羧酸的缩合共聚物有:聚乙二酸乙二醇酯、聚丁二酸乙二醇酯、聚己二酸乙二醇酯、聚壬二酸乙二醇酯、聚乙二酸丁二醇酯、聚丁二酸丁二醇酯、聚己二酸丁二醇酯、聚癸二酸丁二醇酯、聚葵二酸已二醇酯、聚乙二酸新戊二醇酯以及由构成上述物质的重复单元构成的共聚物。
本发明中,前述的聚合物中,特别是(1)聚丁二酸乙二醇酯和、(2)丁二酸乙二醇酯与丁二酸丁二醇酯、己二酸丁二醇酯或癸二酸丁二醇酯共聚的聚酯中丁二酸乙二醇酯的共聚量比为65%摩尔以上的聚酯和、(3)融点在100℃以上的聚乳酸类聚合物、(4)聚丁二酸丁二醇酯(5)丁二酸丁二醇酯与丁二酸乙二醇酯、己二酸丁二醇酯或癸二酸丁二醇酯共聚的聚酯中丁二酸丁二醇酯的共聚量比为65%摩尔以上的聚酯,上述各类聚酯耐热性、制丝性以及生物降解性均优良,所以是令人满意的。
其中,丁二酸乙二醇酯的聚合物和丁二酸丁二醇酯的聚合物中,如果其共聚量比不足65%摩尔,其生物降解性优良,但融点低,且纺丝时丝束成丝性差。
聚乳酸类聚合物中令人满意的有:聚(D-乳酸)、聚(L-乳酸)、D-乳酸与L-乳酸的共聚物、D-乳酸和羟基羧酸共聚物组成的组中可以选择出的融点在100℃以上的聚合物或它们的混合体。其中,乳酸与羟基羧酸共聚物中使用的羟基羧酸可列举的有:羟基乙酸,羟基丁酸、羟基戊酸、羟基己酸、羟基庚酸、羟基辛酸。
将以上的各自具有生物降解性的各种聚合物,选择其多种,将其掺混,也能够适用。
构成生物降解性合成纤维的热塑性聚合物数均分子量约在20,000以上,理想的是40,000以上,更理想的是60,000以上,这样,制丝性及得到的成丝性质优良。另外,为提高其聚合度,用少量的二异氰酸酯、四羧酸二酐等使链延长也可以。
天然纤维及再生纤维的着眼点是其吸液性能即保持湿型纸巾的含液性能。理想的天然纤维有纸浆、棉、麻等,理想的再生纤维有:粘胶人造丝、铜氨人造丝、溶剂纺人造丝、醋酯纤维素特别是取代度在2.0以下的醋酯纤维。各种纤维都能很好地适用,但从使用后就扔弃方面考虑商品的成本的话,理想的是使用纸浆。再有,可以使用多种天然纤维及再生纤维构成的混合物。
生物降解性合成纤维与天然纤维以及/或再生纤维的重量比,理想值是:(生物降解性合成纤维)/(天然纤维以及/或再生纤维)=20/80~75/25的范围。如果生物降解性合成纤维的比例比该范围小的话,纸材的柔软与膨松的手感会有变低下的倾向。另外,如果生物降解性合成纤维的比例比该范围过多的话,天然纤维及/或再生纤维的比例势必会减少,则纸的柔软性优良,并且更加增加膨松柔软的手感,但拉伸强度会变低下,同时也难以满足湿型纸巾必须具有的吸液性。
粘合上述纤维的粘合剂,可列举的有:淀粉或其衍生物、海藻酸钠、黄蓍胶、瓜耳树胶、呫吨树胶、阿拉伯树胶、角叉菜胶、半乳甘露聚糖、明胶、酪蛋白、白蛋白、支链淀粉、聚环氧乙烷、聚乙烯醇、粘胶、聚乙烯醚、聚丙烯酸钠、聚甲基丙烯酸钠、聚丙烯酰胺、聚丙烯酸羟基化的衍生物、聚乙烯吡咯烷酮/乙烯吡咯烷酮醋酸乙烯的共聚物、羧乙基纤维素及其盐、羧甲基纤维素及其盐等。
以上的粘合剂,在水中流动时,实质性的粘合力消失,但并不一定必须是水溶性的,具有水溶胀性或水崩解性的物质也行。
为了补充纸材的强度,可以对该纸材自身加热使生物降解性合成纤维融熔,在该纤维之间热融胶合。但是,该种热融胶合的程度应该足以对纸材在流动水中的分散没有很大妨碍为界的。
对于前述的粘合剂,如果从在水中流动时纸材能立即水解呈分散状态方面和在排水处理设施中微生物处理即生物降解方面及成本方面考虑的话,理想的粘合剂是:羧甲基纤维素及其碱金属盐。更理想的是:羧甲基纤维素钠盐。另外,该羧甲基纤维素的碱金属盐或钠盐使纤维之间结合以后,即在纸材制造中或制造后,添加含有多价金属的溶液,以此方法生成羧甲基纤维素的多价金属盐,从而能够提高纸材的强度。
粘合剂的必需用量根据粘合剂的种类、使用的纤维的种类、该纤维的配合量不同而不同。但通常的用量为纸材整体重量的1%以上且30%以下为宜。不足1%时,不能充分发挥粘合剂的功能,相反,超过30%时,会造成擦拭时手感变硬、清拭功能降低等弊病。并且从成本上也不理想。
本发明的纸材的制造方法,是利用长网法、圆网法为代表的即抄纸法制造,最好是通常的湿式法。该湿式法中,例如是将具有生物降解性的切断的纤维和纸浆均匀分散到含有适量粘合剂的水介质中,然后经抄纸工序、脱水工序、干燥工序制成纸材。
但是,并不一定拘限于上述方法,利用梳理或air raid法等干式法制成纸胎后,在其上面将粘合剂水溶液喷雾上去的方法也适用。
利用本发明的纸材制造湿型纸巾时,在该纸巾中可以含浸含有表面活性剂、酒精等有机溶剂、杀菌剂、抗菌剂、防菌剂、pH调节剂、研磨剂、着色剂、增稠剂、保湿剂、香料、消臭剂等的洗涤液。洗涤液里含有上述成分,也可以代替上述方法,在纸巾制造过程中或制造后直接添加特定成分。
这样,本发明的具有生物降解性的水解性纸材,具备了湿型纸巾的基本条件:良好的柔软性、吸液性和强度,使用后在水洗厕所等的水中流动时,会迅速分解呈分散状态,进而在净化槽或排水处理设施里最终靠微生物或其它物质进行生物降解,不会产生大量的污泥(固形成分),这是其优点。因此,本发明的纸材很适合做成可以冲入水洗厕所里的制品,即:使用后扔弃的物品、卫生巾、婴儿与老人护理用的手纸、擦拭厕所便座的纸巾等。
下面,根据实施例对本发明作具体的说明,但本发明不限于这里列举的实施例。以下实施例中各特性值用以下的方法加以评价。
·水解性(在水中流动时分解的难易程度)
在300ml的玻璃烧杯中加入300ml离子交换水用磁力搅拌器(三田村理研工业社制的“CONSTANT TORQUE MAGMIX STIRRER”)以600rpm的速度搅拌。转子采用圆盘型的(直径35mm,厚12mm,搅拌子是“STAR HEAD”)。在该搅拌的水中投入切断成10cm见方的样品,水解性的指标用以下的标准具体加以确认。
水解性良好O:100秒内形成细片
水解性不好X:形成细片需100秒以上
·压缩抗弯性(g)
将宽(纵向)50mm、长(横向)100mm的样品按横向卷成圆筒状,使用拉伸试验机(东洋Baldwin公司制的“TensiloH”UTM-4-1-100),以50mm/分的压缩速度纵向压缩,这时的最大压缩强度作为压缩抗弯性(g)。该值越高,纸材感觉越硬。吸水率(mm)
将试样裁成120mm×15mm,从短侧边缘向内的5mm处划一条线。然后将试样的上述的短边从边缘到划线的部分,由上方插入蒸馏水中、静置一分钟后,测定水在试样上上升的高度,将其作为吸水率(mm)。该值越高,试料越容易吸液。·生物降解率
试样需氧的生物降解性用JIS-K-6950标准进行测定。将试验开始28日后的降解率(%)作为生物降解率。但,试验用的污泥是大阪府营占野住宅区净化槽的生活排水污泥。·拉伸强度(g/25mm宽)
以JIS-L-1096A记载的方法作为测定标准。即,取长150mm,宽25mm的试样片10份,每片试样分别用定速伸长型的拉伸试验机(东洋Baldwin公司制的“Tensilon”UTM-4-1-100)进行测定。试样片的夹子间隔为100mm,拉伸速度为10cm/分进行拉伸,用得到的最大负荷的平均值(8/25mm宽)进行评定。(实施例1)
用聚丁二酸丁二醇酯树脂,制成纤度为2旦尼尔,纤维长度为5mm的切断的纤维。详细地的情况是:用该聚丁二酸丁二醇酯树脂,利用圆形喷丝孔,单孔喷丝量为0.55g/分,在180℃下熔融法纺丝。然后,从该喷丝孔喷出的丝束进行冷却,施加整理油剂,以1000m/分的卷绕速度把未拉伸的丝卷绕在卷绕轴上。接着,用众所周知的拉伸机,将未拉伸丝拉伸到2.6倍,拉伸后的纤维的纤度为2旦尼尔。再将纤维切断为5mm长。
然后将针叶树纸浆/上述长度为5mm的聚丁二酸丁二醇酯纤维/羧甲基纤维素钠盐(Nichirin化学社制,DS=0.40,pH=6.5)以24/70/6的干燥重量比混合,用方形纸张机械(sheet-machine)(熊谷理机工业社制)利用湿式法制成纸材。接着,该湿纸材用旋转干燥机(熊谷理机工业社制)在85℃、时间100秒条件下干燥,得到单位面积重量为40g/m2的纸材。制得的纸材的特性表示在表1里。
表1
(实施例2)
実施例1 | 実施例2 | 実施例3 | 実施例4 | 実施例5 | 実施例6 | 実施例7 | 実施例8 | 実施例9 | 実施例10 | 実施例11 | |
水解性 | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ |
压缩抗弯性(g) | 37 | 82 | 133 | 24 | 194 | 44 | 161 | 207 | 68 | 74 | 35 |
吸水率(mm) | 37 | 47 | 47 | 18 | 48 | 47 | 46 | 48 | 45 | 46 | 52 |
生物降解率(%) | 54 | 54 | 53 | 55 | 52 | 55 | 52 | 52 | 55 | 58 | 68 |
拉伸强度(g/25mm宽) | 108 | 182 | 270 | 48 | 322 | 151 | 388 | 413 | 167 | 194 | 110 |
与实施例1相比,改变混合重量比。详细情况是:针叶树纸浆/长5mm的聚丁二酸丁二醇酯纤维/羧甲基纤维素钠盐的混合比是按干燥重量比为47/47/16。其它与实施例1相同,制得纸材。制得的纸材特性表示在表1里。(实施例3)
该实施例也是改变混合重量比。详细的情况是:针叶树纸浆/长5mm的聚丁二酸丁二醇酯纤维/羧甲基纤维素钠盐的混合比是按干燥重量比为70/24/6。其它与实施例1相同,制成纸材。制成的纸材特性表示在表1里。(实施例4)
与实施例1相比,是改变了纸浆和生物降解性的合成纤维的混合重量比。详细的情况是:针叶树纸浆/长5mm的聚丁二酸丁二醇酯纤维/羧甲基纤维素钠盐的干燥重量比为14/80/6,进行混合。除此以外与实施例1相同,制得纸材。制成的纸材的特性表示在表1里。(实施例5)
与实施例1相比,改变了纸浆和生物降解性合成纤维的混合重量比。详细地说,针叶树纸浆/长5mm的聚丁二酸丁二醇酯纤维/羧甲基纤维素钠盐的干燥重量比为80/14/6进行混合。然后,除此之外与实施例1相同,制得纸材。制成的纸材的特性表示在表1里。(实施例6)
与实施例2相同比,使粘合剂的混合重量比变小。详细地说,针叶树纸浆/长5mm的聚丁二酸丁二醇酯纤维/羧甲基纤维素钠盐的混合比是干燥重量比49/49/2。然后,除此之外与实施例2相同,制成纸材。制成的纸材的特性表示在表1里。(实施例7)与实施例2相比,使粘合剂的混合重量比变大。详细地说:针叶树纸浆/长5mm的聚丁二酸丁二醇酯纤维/羧甲基纤维素钠盐的混合比为干燥重量比35/35/30,然后,除此之外与实施例2相同,制成纸材,该纸材的特性表示在表1里。(实施例8)
与实施例2相比,改变粘合剂的混合重量比。详细地说:针叶树纸浆/长5mm的聚丁二酸丁二醇酯纤维/羧甲基纤维素钠盐的干燥重量比为32.2/32.5/35,以此混合重量比混合。然后,除此之外与实施例1相同,制得纸材,得到的纸材的特性表示在表1里。(实施例9)
与实施例1相比,将生物降解性合成纤维换成共聚物。详细地说:采用丁二酸丁二醇酯/己二酸丁二醇酯的共聚物树脂(共聚摩尔比为:80/20),制成纤度为2旦尼尔,长度为5mm的切断的纤维。更详细地说,使用该丁二酸丁二醇酯/己二酸丁二醇酯共聚物树脂,利用圆形的喷丝孔,单孔喷丝量为0.51g/分,在160℃下熔融纺丝。然后,使该喷丝孔纺出的丝束冷却,其后施加整理油剂,以卷绕速度为1000m/分的速度将未拉伸丝卷绕到卷绕轴上。接着,用众所周知的拉伸机,将未拉伸的丝拉伸至2.4倍,拉伸后的纤维纤度为2旦尼尔,将该纤维切成5mm长。
接着,将针叶树纸浆/上述长5mm的丁二酸丁二醇酯与己二酸丁二醇酯的共聚物纤维/羧甲基纤维素钠盐(Nichirin化学社制,DS=0.40,pH=6.5)按干燥重量比47/47/6,进行混合。用湿式法调制纸材。然后该湿纸材利用旋转式干燥机(熊谷理机工业社制)在温度85℃,时间100秒的条件下进行干燥,得到单位面积重量为40g/m2的纸材。得到的纸材的特性表示在表1里。(实施例10)
与实施例9相比,改变生物降解性合成纤维的共聚物的种类和摩尔比。详细地说:利用L-乳酸/羟基己酸的共聚物树脂(共聚摩尔比为70/30)制造纤度为2旦尼尔、长度为5mm的切断的纤维,更详细地说:采用该L-乳酸/羟基己酸的共聚物树脂,利用圆形的喷丝孔,单丝的喷丝量为0.57g/分。在200℃下进行熔融法纺丝。然后,使喷丝孔纺出的丝冷却,再施加整理油剂,以1000m/分的卷绕速度将未拉伸的丝卷绕在卷绕轴上,然后利用众所周知的拉伸机,将该未拉伸的丝拉伸到2.7倍,拉伸后的纤维纤度为2旦尼尔,将该纤维切成5mm长。
接着,将针叶树纸浆/上述长度为5mm的L-乳酸与羟基己酸的共聚物纤维/羧甲基纤维素钠盐(Nichirin化学社制,DS=0.40,pH=6.5)按干燥重量比为47/47/6的比例混合,然后用方形纸张机械(熊谷理机工业社制),湿式法制成纸材。再在旋转式干燥机(熊谷理机工业社制)中将该湿纸材在85℃、时间100秒条件下干燥,得到单位面积重量为40g/m2的纸材。得到的纸材的特性表示在表1里。(实施例11)
实施例1-10是用湿式法制作的纸材,相对于该法,也可采用Air raid法制作纸材。
首先,采用聚丁二酸乙二醇酯树脂,制成纤维纤度为2旦尼尔、长度为5mm的切断纤维。详细地说:采用该聚丁二酸亚乙基树脂,利用圆形喷丝孔,单孔喷丝量为0.57g/分,在160℃条件下进行熔融法纺丝。然后将从该喷丝孔纺出的丝冷却,再施加整理油剂,以1000m/分的卷绕速度将未拉伸的丝卷绕到卷绕轴上。然后利用众所周知的拉伸机,将未拉伸丝拉伸到2.7倍,拉伸后的纤维纤度为2旦尼尔,将该纤维切断成5mm长的纤维。
接着,采用该切断的纤维和微细粉状的针叶树纸浆,按干燥重量比为:聚丁二酸乙二醇酯纤维/针叶树纸浆=50/50,用Air raid法制成纸胎。然后,将预先配制好的含羧甲基纤维素钠盐(Daicel化学工业社制“CMCDaicel 1025”)10%重量的水溶液用喷雾的方法,涂在纸胎上。接着,用热风循环式干燥机(井染机工业社制)在温度85℃,时间80秒的条件下干燥,制成针叶树纸浆/聚丁二酸乙二醇酯纤维/羧甲基纤维素钠盐=47/47/6(重量比)的单位面积重量为40g/m2的纸材。得到的纸材的特性表示在表1里。
从表1中可以清楚地看到,实施例1~3,6、7、9~11的纸材每个都有良好的吸水度和水解性。并且压缩抗弯性低,有柔软的手感,由于实际应用吸水时也具有润湿后适度的柔软性和丰满的手感,所以作为湿型擦拭纸巾的擦拭性优良,与现有的单纯用纸浆制的产品相比,其显著的优越性可一目了然。还有该纸材具有实用的拉伸强度。
实施例4的纸材与实施例1相比生物降解性合成纤维的含有率高,针叶树纸浆的含有率低,所以吸水性、拉伸强度稍微低一些,但水解性良好,特别是压缩抗弯性低,具有显著的柔软的手感。由于吸水时具有润湿后适度的柔软性和丰满的手感,所以非常适合用于清拭以臀部为代表的人体擦拭用湿型纸巾。
实施例5的纸材与实施例1相比针叶树纸浆的含有率高,生物降解性刚性纤维含有率低,所以柔软性稍差一些,但吸水率、水解性优良,特别是拉伸强度显著良好,所以非常适合于以擦拭厕所为代表的器皿擦拭用湿型纸巾。
实施例8的纸材与实施例1相比,针叶树纸浆和粘合剂含有率都高,所以柔软性稍差,但吸水率及水解性优良,特别是拉伸强度显著地优良,所以很适合于以擦拭厕所为代表的器皿擦拭用湿型纸巾。
关于生物降解性,实施例1~11的纸材,在活性污泥中的需氧生物降解性都很优良,埋设在活性污泥中经过28天以后,每种的生物降解率都达到50%以上。(比较例1)
不用生物降解性合成纤维制成纸材。详细地说,将针叶树纸浆/羧甲基纤维素钠盐(Nichirin化学社制,DS=0.40,pH=6.5)按干燥重量比为94/6进行混合,用方型纸张机械(熊谷理机工业社制)在温度85℃,时间100秒的条件下干燥,得到单位面积重量为40g/m2的纸材。得到的纸材的特性表示在表2里。(比较例2)
用不具有生物降解性的合成纤维制成的纸材。详细地说:将针叶树纸浆/聚酯纤维(PET)/羧甲基纤维素钠盐(Nichirin化学社制DS=0.40,pH=6.5),按干燥重量比47/47/6混合,用湿式法调制纸材,该湿纸材在旋转式干燥机(熊谷理机工业社制)湿度85℃、时间100秒条件下干燥处理,得到单位面积重量为40g/m2的纸材。得到的纸材的特性表示在表2里。(比较例3)
不用作为天然纤维的纸浆制成纸材。详细地说,将5mm长的聚丁二酸丁二醇酯的纤维/羧甲基纤维素钠盐按干燥重量比为94/6进行混合。其余与实施例1相同制成纸材,制成的纸材的特性表示在表2里。
表2
比較例1 | 比較例2 | 比較例3 | |
水解性 | ○ | ○ | ○ |
压缩抗弯性(g) | 255 | 133 | 9 |
吸水率(mm) | 50 | 45 | 3 |
生物降解率(%) | 52 | 27 | 55 |
拉伸强度(g/25mm宽) | 465 | 239 | 21 |
比较例1中的制品,吸水率、水解性及生物降解性优良,但由于只有纸浆不含合成纤维手感会感到硬,作湿型纸巾用时,对皮肤的触感差。比较例2的制品,吸水率、水解性以及柔软性优良,但使用的合成纤维是普通的聚对苯二甲酸乙二醇酯,所以生物降解性差。比较例3的制品,由于只含有生物降解性纤维,不含有天然纤维及/或再生纤维,所以吸水率差并且拉伸强度也低。
Claims (7)
1.具有生物降解性的水解性纸材,其中含有1种或2种以上的生物降解性合成纤维和1种或两种以上的天然纤维及/或再生纤维,这些纤维用在水中粘合力实质上消失的粘合剂粘合在一起。
2.权利要求1中记载的具有生物降解性的水解性纸材,其中生物降解性合成纤维由脂肪族聚酯构成。
3.权利要求2中记载的具有生物降解性的水解性纸材,其中使用的脂肪族聚酯是下述的任一种:(a)聚丁二酸乙二醇酯、(b)丁二酸乙二醇酯与丁二酸丁二醇酯、己二酸丁二醇酯或癸二酸丁二醇酯共聚合的共聚物、(c)聚丁二酸丁二醇酯、(d)丁二酸丁二醇酯与己二酸丁二醇酯或癸二酸丁二醇酯共聚合的共聚物、(e)上述各聚合物的混合物。
4.权利要求2中记载的具有生物降解性的水解性纸材,其中使用的脂肪族聚酯是下述的任一种:聚(D-乳酸)、聚(L-乳酸)、D-乳酸和L-乳酸的共聚物、D-乳酸与羟基羧酸的共聚物、L-乳酸与羟基羧酸的共聚物、以及上述聚合物的混合物。
5.权利要求1中记载的具有生物降解性的水解性纸材,其中粘合剂是由羧甲基纤维素或其盐构成。
6.权利要求1中记载的具有生物降解性的水解性纸材,其中生物降解性合成纤维与天然纤维及/或再生纤维的重量比为:(生物降解性合成纤维)/(天然纤维及/或再生纤维)=20/80~75/25的范围。
7.权利要求1中记载的具有生物降解性的水解性纸材,其中粘合剂的重量比为占纸材总重量的1%至30%。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP26456695 | 1995-10-13 | ||
JP264,566/95 | 1995-10-13 |
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CN1166189A true CN1166189A (zh) | 1997-11-26 |
CN1082113C CN1082113C (zh) | 2002-04-03 |
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US (1) | US5905046A (zh) |
EP (1) | EP0801172B1 (zh) |
JP (1) | JP3888693B2 (zh) |
KR (1) | KR100456057B1 (zh) |
CN (1) | CN1082113C (zh) |
CA (1) | CA2206478C (zh) |
DE (1) | DE69625584T2 (zh) |
TW (1) | TW403801B (zh) |
WO (1) | WO1997013920A1 (zh) |
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-
1996
- 1996-10-11 CN CN96191211A patent/CN1082113C/zh not_active Expired - Fee Related
- 1996-10-11 JP JP51184697A patent/JP3888693B2/ja not_active Expired - Lifetime
- 1996-10-11 CA CA002206478A patent/CA2206478C/en not_active Expired - Fee Related
- 1996-10-11 US US08/817,723 patent/US5905046A/en not_active Expired - Lifetime
- 1996-10-11 DE DE69625584T patent/DE69625584T2/de not_active Expired - Lifetime
- 1996-10-11 WO PCT/JP1996/002974 patent/WO1997013920A1/ja active IP Right Grant
- 1996-10-11 KR KR1019970702083A patent/KR100456057B1/ko not_active IP Right Cessation
- 1996-10-11 EP EP96933641A patent/EP0801172B1/en not_active Expired - Lifetime
- 1996-10-15 TW TW085112583A patent/TW403801B/zh not_active IP Right Cessation
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102677396A (zh) * | 2011-09-16 | 2012-09-19 | 3M中国有限公司 | 基于可再生纤维的非织造材料及其制备方法 |
CN103866642A (zh) * | 2014-02-28 | 2014-06-18 | 苏州恒康新材料有限公司 | 一种纸张柔软剂及其制备方法 |
CN103866642B (zh) * | 2014-02-28 | 2016-03-09 | 苏州恒康新材料有限公司 | 一种纸张柔软剂及其制备方法 |
CN104313935A (zh) * | 2014-10-23 | 2015-01-28 | 广东比伦生活用纸有限公司 | 一种速溶卷纸及其生产方法 |
CN105295107A (zh) * | 2015-12-01 | 2016-02-03 | 惠安华晨贸易有限公司 | 一种可降解的垃圾袋及其制备方法 |
CN115341338A (zh) * | 2022-08-30 | 2022-11-15 | 大连瑞光非织造布集团有限公司 | 一种低成本高湿强可冲散非织造布及生产方法 |
CN115341338B (zh) * | 2022-08-30 | 2024-06-07 | 大连瑞光非织造布集团有限公司 | 一种低成本高湿强可冲散非织造布及生产方法 |
Also Published As
Publication number | Publication date |
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CA2206478A1 (en) | 1997-04-17 |
WO1997013920A1 (fr) | 1997-04-17 |
KR100456057B1 (ko) | 2004-12-23 |
EP0801172B1 (en) | 2003-01-02 |
EP0801172A4 (en) | 1998-08-26 |
US5905046A (en) | 1999-05-18 |
DE69625584T2 (de) | 2003-09-04 |
CA2206478C (en) | 2005-07-12 |
JP3888693B2 (ja) | 2007-03-07 |
CN1082113C (zh) | 2002-04-03 |
EP0801172A1 (en) | 1997-10-15 |
TW403801B (en) | 2000-09-01 |
DE69625584D1 (de) | 2003-02-06 |
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