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水性树脂材料的选择和制作工艺

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水性树脂材料的选择和制作工艺


尽管水性树脂拥有许多特性可以同超纤进行最佳的性能互补,但在应用过程和组合过程中仍有许多要点和难点,需要研究解决。


1、 正确选择树脂 一般来说,应针对不同的制革工艺、合成革的使用物性要求来选择树脂。 从工艺上来说,封低用的树脂选择一定要软,不能有因封底后出现死板僵硬的感觉;粘结层树脂应选择结合牢度强,耐水解高的树脂,这样才能有效防止遇水脱胶或剥离强度不高的状况发生;中层树脂宜软性好、弹性足;面顶层树脂则按合成革的使用要求综合各种因素进行考察选择。顶层树脂选择不当,则合成革的风格特点将会完全改变。因此,选择树脂,重点是选择顶层树脂。 通常,鞋革需选择水性高模量树脂,需要水性树脂具有耐磨、耐刮、耐折性能,如果是做浅色或白色革运动鞋时,应选择高模量耐黄变水性树脂。沙发革需选择水性中模量树脂,这类树脂应具备抗磨耐刮性能以外,还要具备良好的耐脏抗污性,具有较好的手感特别是真皮一样的触感。服装及软包革则应选择低模量的树脂,这类树脂,必须具有低温柔软性好,富有弹性,触感类似于真皮,同时应具备可以进行干洗和水洗要求,即耐水和耐溶剂性能要求特别高。


2、 正确选择工艺 超纤革加工一般是选择合成革的纯干法工艺,尽管工艺单一,但由于革面要求不同,革的使用性能不同,其加工工艺的选择同样十分重要, 根据革面纹路确定工艺。超纤基布含有一定的纤维松散在表面,这些纤维如果不进行一定的封底或填充处理,在超纤细花纹革尤其是超纤镜面革上,会造成表面不平整、影响光亮度、影响视觉感。因此,如果生产细花纹或镜面革时,通常要进行超纤基布的封底处理。同时,在干法生产工艺上,一般选择二刀以上的上浆工艺,用增加涂膜的厚度来提高革面的视觉效果。深花纹的超纤革,上浆次数和上浆量以不露沟底为基本标准。 根据不同合成革的使用性能确定不同工艺。一般来说,鞋革需要的是较高强度的表面,因此,表面应保持较高的厚度,中层可以薄些,沙发革既要有较好的表面物性,又要有较好的触感和弹性,故顶层和中层树脂选择相当的量。而服装革和手袋革等,更注重的是弹性和手感,故应注意中层的上浆量加大,同时,粘贴层树脂必须是低模量高用量。


Selection and manufacture Technology of Waterborne Resin Materials


Although waterborne resin has many properties that can complement each other best with superfiber, there are still many key points and difficulties in the process of application and combination, which need to be studied and solved.

1. Generally speaking, resin should be selected according to different leather making technology and the requirements of physical properties of synthetic leather. 
From the technological point of view, the low use of resin selection must be soft, can not have the feeling of rigidity after sealing the bottom; 
The adhesive layer resin should choose the resin with strong binding fastness and high hydrolysis resistance, so as to effectively prevent the occurrence of water degumming or low peeling strength, the middle layer resin is suitable for softness and elasticity, and the adhesive layer resin should be selected as the resin with strong binding fastness and high hydrolysis resistance. 
The top layer resin was investigated and selected according to the requirements of synthetic leather. 
If the top resin is not selected properly, the style characteristics of synthetic leather will be completely changed. 
Therefore, the selection of resin, the focus is to select the top resin. 
In general, shoe leather needs to choose water-based high modulus resin, water-based resin with wear resistance, scraping resistance, folding resistance, if it is to do light color or white leather sports shoes, should choose high modulus yellowing water-resistant resin. 
Sofa leather needs to choose water-based medium modulus resin, this kind of resin should have anti-wear and scratch resistance, but also have good resistance to dirt and dirt, with good feel, especially leather-like touch. 
Clothing and soft bag leather should choose low modulus resin, this kind of resin, must have low temperature softness, rich elasticity, touch similar to leather, at the same time should have the requirements of dry cleaning and water cleaning. 
That is, the requirements of water resistance and solvent resistance are particularly high.

2. The correct selection of processing technology of ultra-fiber leather is generally the choice of pure dry process of synthetic leather. Although the process is single, due to the different requirements of leather surface and the different properties of leather, the selection of processing technology is also very important. 
The process is determined according to the leather pattern. 
The superfiber base cloth contains certain fibers loose on the surface. If these fibers are not sealed or filled, they will cause uneven surface, affect the brightness and affect the visual sense on the ultra-fiber fine pattern leather, especially on the ultra-fiber mirror leather. 
Therefore, if the production of fine pattern or mirror leather, it is usually necessary to carry out ultra-fiber based cloth cover treatment. 
At the same time, in the dry production process, the sizing process of more than two knives is generally selected, and the visual effect of leather surface is improved by increasing the thickness of the coating film. 
For the ultra-fiber leather with deep pattern, the sizing times and sizing quantity are based on the non-exposed furrow bottom as the basic standard. 
Different processes were determined according to the performance of different synthetic leather. 
Generally speaking, shoe leather needs a higher strength surface, therefore, the surface should maintain a higher thickness, the middle layer can be thinner, sofa leather should not only have better surface physical properties, but also have better touch and elasticity. 
Therefore, a considerable amount of resin is selected for the top layer and the middle layer. 
Clothing leather and handbag leather, etc., pay more attention to elasticity and feel, so we should pay attention to the increase of the sizing amount of the middle layer, at the same time, the adhesive layer resin must be low modulus and high dosage.


更新日期:2019-08-02
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