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CN109195812A - 用于由弹性体材料制成的制品、优选用于充气车辆轮胎的加强层以及充气车辆轮胎 - Google Patents

用于由弹性体材料制成的制品、优选用于充气车辆轮胎的加强层以及充气车辆轮胎 Download PDF

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CN109195812A
CN109195812A CN201780032779.7A CN201780032779A CN109195812A CN 109195812 A CN109195812 A CN 109195812A CN 201780032779 A CN201780032779 A CN 201780032779A CN 109195812 A CN109195812 A CN 109195812A
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tekes
enhancement layer
cord
yarn
under
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CN109195812B (zh
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沃尔夫冈·雷泽
托马斯·克拉默
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    • B60C9/00Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/0042Reinforcements made of synthetic materials
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
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    • B60C15/0632Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a bead reinforcing layer using flippers in contact with and wrapped around the bead core and, at least partially, in contact with the bead filler
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    • B60C15/0635Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a bead reinforcing layer using chippers between the carcass layer and chafer rubber wrapped around the bead
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    • DTEXTILES; PAPER
    • D02YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
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    • DTEXTILES; PAPER
    • D02YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
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    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06MTREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/693Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with natural or synthetic rubber, or derivatives thereof
    • DTEXTILES; PAPER
    • D07ROPES; CABLES OTHER THAN ELECTRIC
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    • D07B1/025Ropes built-up from fibrous or filamentary material, e.g. of vegetable origin, of animal origin, regenerated cellulose, plastics comprising high modulus, or high tenacity, polymer filaments or fibres, e.g. liquid-crystal polymers
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    • BPERFORMING OPERATIONS; TRANSPORTING
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Abstract

本发明涉及一种用于由弹性体材料构成的制品、优选用于车辆轮胎的用橡胶处理的加强层,其中该加强层具有多个平行且间隔开的增强元件,其中每个增强元件是由至少两种由聚酰胺6.6构成的加捻的复丝纱线末端加捻的帘线。由聚酰胺6.6构成的原纱线具有在4%伸长率下在从1.35cN/分特克斯至1.60cN/分特克斯范围内的韧度,该帘线具有在4%伸长率下在从1.2cN/分特克斯至2cN/分特克斯范围内的韧度,并且该帘线具有在177°下在4.0%‑7.0%的范围内的热收缩率,其中根据ASTM D885‑16的韧度和177℃下的热收缩率在0.045g/分特克斯的预加张力下用两分钟的暴露时间进行测定。

Description

用于由弹性体材料制成的制品、优选用于充气车辆轮胎的加 强层以及充气车辆轮胎
技术领域
本发明涉及一种用于由弹性体材料构成的制品、优选用于车辆轮胎的用橡胶处理的加强层,其中该加强层具有多个平行且间隔开的增强元件,其中每个增强元件是由至少两种由聚酰胺6.6构成的加捻的复丝纱线末端加捻的帘线。本发明进一步涉及一种包含这种加强层的充气车辆轮胎。
背景技术
用于由弹性体材料制成的制品(例如像工业橡胶产品和(充气)车辆轮胎)的加强层是非常重要的,并且是本领域技术人员的常识。这些加强层具有多个加强的线形元件(被称为增强元件)。将它们完全嵌入弹性体材料中。这些加强层的增强元件具有例如织物或压延的连续盘绕的增强元件的形式。
在充气车辆轮胎中,使用帘线作为增强元件,例如在胎圈区域中作为胎体材料并且在带束箍带中用于带束层。
用于本专利申请目的的帘线由至少2种相互加捻的复丝纱线组成。
充气车辆轮胎中的带束箍带(尤其在高速使用的情况下)用于防止轮胎由于驾驶操作中产生的离心力而隆起。在充气车辆轮胎中,该充气车辆轮胎通常具有不透空气的内层、包含增强元件并且从该轮胎的胎冠区域通过胎壁延伸到胎圈区域的子午线胎体(该胎圈区域通常通过具有高拉张强度的胎圈芯的缠绕进行锚定)、具有胎面花纹沟(profilegroove)的径向向外的胎面以及带束,该箍带安排在带束与胎面之间。该带束箍带可以具有一层或多层,覆盖至少该带束边缘并且包含平行的且基本上在圆周方向上走向的呈被嵌入橡胶混合物中的帘线的形式的增强元件。在轮胎生产中,该带束箍带以具有嵌入未固化的橡胶混合物中的增强元件的多个层、条带或单独的增强元件的形式被应用,这些增强元件缠绕或盘绕到该带束上。将用于此多个层的增强元件嵌入橡胶中,例如像,一系列基本上平行的线形增强元件(一般来说,这些元件已经以本领域技术人员已知的方式经受了通过热手段和/或用浸渍的预处理,以便更好地粘附到嵌入橡胶上)在纵向方向上穿过压延机或挤出机以便用橡胶混合物进行包裹。一种替代方案是使用已经粘附地浸渍并且可以在没有压延的粘附混合物的情况下进行加工的增强元件。在轮胎的成型和固化过程中,与未固化的胎胚(当所述胎胚盘绕在平坦的滚筒上时)相比,该轮胎由于隆起一般来说在胎肩区域中拉伸高达2%并且在中间区域中拉伸高达4%。因此,在带束箍带中使用的增强元件被认为有利地允许这种隆起,换句话说,被认为有利地最初在相对低的施力下是可拉伸的,并且在此高达4%的初始拉伸之后,对于高速可操作性,仅在更高的施力下可拉伸。因此,在力-伸长率图中,直到4%的伸长率,增强元件都具有相对平坦的曲线,并且之后具有更陡峭的曲线。
该带束箍带具有一层或多层,覆盖该带束边缘并且包含平行的且近似地在圆周方向上走向的呈被嵌入橡胶中的帘线的形式的增强元件。“近似地在圆周方向上”是指相对于轮胎的圆周方向的0°至5°的角度。
由WO 2014182265 A1已知一种充气车辆轮胎,其带束箍带包括由聚酰胺6.6制成的增强元件。
US 3,343,363 A披露了作为用于轮胎的增强元件、作为加强材料的加捻的聚酰胺6.6细丝、纱线和帘线,其具有在室温下在25与60g/d之间的初始模量以及大于7.0g/d的韧度。初始模量值根据ASTM A1380-61T进行测定。
US 3,849,976 A披露了作为轮胎加强材料的具有两种或更多种L5模量大于60g/d的复丝纱线的聚酰胺6.6帘线,这些帘线已经通过高温下的高张力拉伸获得。
US 4,284,117 A披露了作为充气车辆轮胎的带束箍带的增强元件的加捻的尼龙、聚酯、人造丝和芳族聚酰胺纱线。
US 5,115,853 A披露了具有420d×2(470分特克斯×2)构造和小于276t/m的帘线加捻率的尼龙帘线,其用于充气车辆轮胎的带束绷带中。
从现有技术中已知的做法是通过在相对高的温度下对聚酰胺帘线进行热拉伸来增加聚酰胺帘线的初始模量或LASE(特定伸长率下的负荷)。为了甚至在(在实验室条件下用自由切割端调节的)松弛之后保存所得到的特性,迄今为止必需将PA 6.6纱线或帘线暴露于高于250℃的温度条件下。然而,缺点是在上述条件下,帘线变硬/变脆,并且因此在暴露于循环压缩应力和弯曲应力时遭受更快速的疲劳。
发明内容
本发明的目的是提供一种用于由弹性体材料构成的制品的加强层,所述层具有由聚酰胺6.6构成的增强元件,这些增强元件具有从4%伸长率的相对高的模量,但关于循环压缩应力和弯曲应力暴露是更抗疲劳的。本发明的另一个目的是提供一种充气车辆轮胎,其具有上述加强层并且表现出改进的高速特性和改进的滚动阻力。
关于加强层实现该目的,其中由聚酰胺6.6构成的原纱线具有在4%伸长率下在从1.35cN/分特克斯至1.60cN/分特克斯范围内的韧度,其中该帘线具有在4%伸长率下在从1.2cN/分特克斯至2cN/分特克斯范围内的韧度,并且其中该帘线具有在177°下在4.0%-7.0%的范围内的热收缩率,其中根据ASTM D885-16的韧度和177℃下的热收缩率在0.045g/分特克斯的预加张力下用两分钟的暴露时间下进行测定。
“原纱线”是指尚未经历热拉伸的复丝纱线。
“帘线”是指具有已经经历包括浸渍的热拉伸操作的复丝纱线的增强元件。
制造加强层,该加强层的帘线由聚酰胺6.6构成,这些帘线具有在4%伸长率下比可比较帘线更高的弹性模量,但关于循环压缩应力和弯曲应力暴露是更抗疲劳的。这些特性尤其适用于这种有待用于车辆轮胎的加强层,更特别地作为带束箍带,因为轮胎生产仍然保留了高达约3%的必需伸长率,而在较高的伸长率下,必需施用较高的力,这对于轮胎的高速操作是有利的。
以下对于具有1400×2构造的由聚酰胺6.6构成的增强元件在4%拉伸率下的韧度的比较值显示出,通过与现有技术加强层中的标准增强元件(A)相比,在本发明的加强层中使用的增强元件(B)的更高韧度的优点:
表1
A 1400×2 29N=1.0cN/分特克斯
B 1400×2 35N=1.3cN/分特克斯
出人意料地,通过以下获得用于本发明的加强层的聚酰胺6.6的帘线:由聚酰胺6.6构成的所用原纱线具有在4%伸长率下在从1.35cN/分特克斯至1.60cN/分特克斯的范围内的韧度,并且此原纱线在230℃与250℃之间的温度下在大于5%且小于12%的范围内拉伸,并且以在150g与500g/增强元件之间的张力盘绕到合适的线轴上。结果,通过拉伸操作获得的特性也保持在缠绕到线轴上的增强元件中,因为增强元件不能松弛并且可以在轮胎中使用而不松弛,松弛总是意味着模量损失。
在将线轴上的纱线在24℃和55%的相对大气湿度下调节24小时之后,根据D885-16测定帘线的力-伸长率数据。调节后,将这些帘线在从线轴上退绕后1分钟内进行测试。
这些帘线具有在4%伸长率下从1.2cN/分特克斯至2.0cN/分特克斯的韧度以及在177℃下从4%至7%的热收缩率。在4%伸长率下从1.2cN/分特克斯至2.0cN/分特克斯的韧度对应于30.6g/分特克斯至51g/分特克斯(34g/d至56.7g/d)的模量。
如下计算模量值:在4%伸长率下的韧度×25,以得到100%伸长率所需的韧度。
在4%伸长率下的韧度[cN/分特克斯]为:在4%伸长率下的张力[cN]/线密度[分特克斯],使用整个增强元件的线密度。
整个增强元件的线密度由帘线中复丝纱线的线密度的总和计算。实例:对于整个增强元件,具有700分特克斯×2构造的帘线具有1400分特克斯的线密度。
使用来自制造商Testrite的收缩测量装置在0.045g/分特克斯的预加张力下在177℃下用2分钟的暴露时间测定纱线和帘线的热收缩率。
如果由聚酰胺6.6构成的原纱线具有在4%伸长率下在从1.35cN/分特克斯至1.50cN/分特克斯的范围内的韧度,则是有用的。如果力甚至更大,则这可能在模具引入期间导致问题。
如果帘线具有从300至4000分特克斯的线密度,则是有用的。此线密度范围代表一方面强度与另一方面滚动阻力和成本之间的有利平衡。如果线密度太低,并且因此如果复丝纱线太稀疏,则所得强度将太低。如果复丝纱线太稠密,则将对轮胎的滚动阻力和成本不利。
如果该帘线的捻系数α是在从100至250的范围内、优选在从120至180的范围内,则是有利的,其中α=捻度[t/m]·(线密度[特克斯]/1000)1/2。捻系数是相对于帘线的线密度,每米帘线的末端加捻的量度。捻系数是基于复丝纱线的线密度的每米复丝纱线的加捻的量度。此捻系数代表就抗疲劳性和强度方面的有利平衡。较低的捻系数将对抗疲劳性是不利的,而较高的捻系数将意味着增强元件的一部分上的强度较低。
如果该帘线具有×2或×3构造,则有用。由2种或3种纱线构成的帘线具有比加捻的复丝纱线更好的抗疲劳性。在高于×3的构造的情况下,加捻成本不利地急剧增加,而其他特性(如韧度)可能遭受不利的下降。
附图说明
具体实施方式
在本发明的第一特别合适的实施例中,加强层的每个增强元件是由两种相互加捻的复丝纱线构成的帘线并且每种复丝纱线具有1400分特克斯的纱线线密度。因此,该帘线的构造是1400×2。该帘线具有在4%伸长率下在从1.3cN/分特克斯至1.4cN/分特克斯的范围内的韧度。优选以90epdm的密度将这些帘线安排在加强层中。由于PA6.6帘线的模量增加,与现有技术相比,它可以以更低的密度安排在加强层中,从而简化了该层的生产并且同样在减少使用增强元件的基础上实现成本优势。同样,半成品在被切割成所需条带宽度时受损的风险较低。
在本发明的第二特别合适的实施例中,加强层的每个增强元件是由两种相互加捻的复丝纱线构成的帘线并且每种复丝纱线具有470分特克斯的纱线线密度。因此,该帘线的构造是470×2。该帘线具有在4%伸长率下在从1.6cN/分特克斯至1.7cN/分特克斯的范围内的韧度。优选以90至100epdm的密度将这些帘线安排在加强层中。由于PA6.6帘线的模量增加,与现有技术相比,它可以以更低的密度安排在加强层中,从而简化了该层的生产并且同样在减少使用增强元件的基础上实现成本优势。同样,半成品在被切割成所需条带宽度时受损的风险较低。
在本发明的第三特别合适的实施例中,加强层的每个增强元件是由两种相互加捻的复丝纱线构成的帘线并且每种复丝纱线具有350分特克斯的纱线线密度。因此,该帘线的构造是350×2。该帘线具有在4%伸长率下的1.9cN/分特克斯的韧度。优选以110至130epdm的密度将这些帘线安排在加强层中。由于PA6.6帘线的模量增加,与现有技术相比,它可以以更低的密度安排在加强层中,从而简化了该层的生产并且同样在减少使用增强元件的基础上实现成本优势。同样,半成品在被切割成所需条带宽度时受损的风险较低。
如果该加强层是带束箍带层,则是有利的,其中这些增强元件以用橡胶处理的织物条带的形式或作为用橡胶处理的织物缠绕或者以单独帘线的形式或作为具有多个平行的单独帘线的用橡胶处理的条带螺旋盘绕。聚酰胺6.6帘线具有使其尤其适用于带束箍带的物理特性。
然而,替代地,该加强层同样可以是胎圈加强物,如胎跟加强层(chipper)或胎圈芯包布(flipper)。
通过具有上述用橡胶处理的加强层的所述轮胎关于充气车辆轮胎实现本发明。充气车辆轮胎的特征是改进的滚动阻力。在加强层中增强元件密度较高的情况下,充气车辆轮胎同样表现出改进的高速性能。
轮胎测试使用尺寸为225/45R17的汽车轮胎进行,其中带束箍带由2个盘绕的加强层组成。具有相同构造的汽车轮胎用于这些测试,其中仅带束箍带是变化的。本发明的加强层具有1400×2构造的由聚酰胺6.6制成的增强元件,这些增强元件以90epdm的密度安排在加强层中。作为比较,测试了现有技术的加强层,其具有110epdm密度的具有1400×2构造的由标准聚酰胺6.6制成的增强元件。
下表2显示了这些测试的结果:
表2
可以看出,尽管增强元件的密度明显更低,但本发明的加强层在4%伸长率下的强度与现有技术的加强层的强度大致相同。同样可以看出,在滚动阻力方面赢得了优势。现有技术的参考轮胎具有100%的滚动阻力,而具有本发明的加强层的轮胎取得101.3%的滚动阻力。更高的%数字表示更好的滚动阻力。

Claims (12)

1.一种用于由弹性体材料构成的制品、优选用于车辆轮胎的用橡胶处理的加强层,其中该加强层具有多个平行且间隔开的增强元件,其中每个增强元件是由至少两种由聚酰胺6.6构成的加捻的复丝纱线末端加捻的帘线,
其特征在于,由聚酰胺6.6构成的原纱线具有在4%伸长率下在从1.35cN/分特克斯至1.60cN/分特克斯的范围内的韧度,
其特征在于,该帘线具有在4%伸长率下在从1.2cN/分特克斯至2cN/分特克斯的范围内的韧度,并且
其特征在于,该帘线具有在177°下在4.0%-7.0%范围内的热收缩率,
其中根据ASTM D885-16的韧度和177℃下的热收缩率在0.045g/分特克斯的预加张力下用两分钟的暴露时间进行测定。
2.如权利要求1所述的加强层,其特征在于,该帘线具有从300至4000分特克斯的线密度。
3.如前述权利要求中一项或多项所述的加强层,其特征在于,每种复丝纱线或该帘线的捻系数α是在从100至250的范围内、优选在从120至180的范围内,其中α=捻度[t/m]·(线密度[特克斯]/1000)1/2
4.如前述权利要求中一项或多项所述的加强层,其特征在于,该由聚酰胺6.6构成的原纱线具有在4%伸长率下在从1.35cN/分特克斯至1.50cN/分特克斯的范围内的韧度。
5.如前述权利要求1至4中一项或多项所述的加强层,其特征在于,该复丝纱线具有在177℃下在5.0%-6.5%范围内的热收缩率。
6.如前述权利要求中一项或多项所述的加强层,其特征在于,该帘线具有×2或×3的构造。
7.如权利要求6所述的加强层,其特征在于,该增强元件是由两种相互加捻的复丝纱线构成的帘线,并且每种复丝纱线具有1400分特克斯的纱线线密度并且因此具有1400×2的构造,其特征在于,该帘线具有在4%伸长率下在从1.3cN/分特克斯至1.4cN/分特克斯范围内的韧度,并且其特征在于,这些帘线优选以80-120epdm的密度、更优选以90epdm的密度安排在该加强层中。
8.如权利要求6所述的加强层,其特征在于,该增强元件是由两种相互加捻的复丝纱线构成的帘线,并且每种复丝纱线具有470分特克斯的纱线线密度并且因此具有470×2的构造,其特征在于,该帘线具有在4%伸长率下在从1.6cN/分特克斯至1.7cN/分特克斯范围内的韧度,并且其特征在于,这些帘线优选以90-170epdm的密度、更优选以约100epdm的密度安排在该加强层中。
9.如权利要求6所述的加强层,其特征在于,该增强元件是由两种相互加捻的复丝纱线构成的帘线,并且每种复丝纱线具有350分特克斯的纱线线密度并且因此具有350×2的构造,其特征在于,该帘线具有在4%伸长率下1.9cN/分特克斯的韧度,并且其特征在于,这些帘线优选以110至200epdm的密度、更优选以110至130epdm的密度安排在该加强层中。
10.如前述权利要求中任一项所述的加强层,其特征在于,该加强层是带束箍带层,其中这些增强元件以用橡胶处理的织物条带的形式或作为用橡胶处理的织物缠绕或者以单独帘线的形式或作为具有多个平行的单独帘线的用橡胶处理的条带螺旋盘绕。
11.如前述权利要求1至9中任一项所述的加强层,其特征在于,该加强层是胎圈加强物,如胎跟加强层或胎圈芯包布。
12.一种充气车辆轮胎,其具有如前述权利要求中任一项所述的加强层。
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US20190299718A1 (en) 2019-10-03
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