81results about How to "Lower water contact angle" patented technology

In one embodiment, the invention relates to composite films having barrier properties, and more particularly, to composite films which comprise a silicon nitride based coating on a flexible plastic substrate wherein the silicon nitride based coating has a thickness of less than about 220 nm and is deposited on the plastic substrate by sputtering of a silicon target in an atmosphere comprising at least 75% by volume of nitrogen. The composite barrier film has a visible light transmittance of at least about 75%. In another embodiment, the invention relates to a barrier method of depositing a silicon nitride based coating on a plastic substrate to form a composite barrier film which comprises depositing a silicon nitride based coating on the substrate by sputtering of a silicon target in an atmosphere comprising at least about 75% by volume nitrogen.

The invention discloses a polyvinylidene fluoride hollow fiber film and a preparation method thereof. The polyvinylidene fluoride hollow fiber film comprises the following components by weight percent: 20-60% of polyvinylidene fluoride resin, 10-50% of organic pore-forming agent, 1-30% of inorganic pore-forming agent and 5-30% of solvent. The preparation method comprises the following steps: mixing, squeezing, cooling, stretching, extracting the organic pore-forming agent and the inorganic pore-forming agent, and thermally shaping. The obtained polyvinylidene fluoride hollow fiber film has the advantages of high strength, good performance, better hydrophilicity, simple preparation process and energy saving.

To improve the joining (adhesion) force of a polybutadiene formed article and a polar resin formed article, and to further improve the joining force by selecting (combining) a solvent(s) for these formed articles. A method for adhering a polybutadiene formed article, which comprises (1) the step of reducing the water contact angle of a surface of the polybutadiene formed article by ozone treatment, electron beam treatment, corona discharge treatment, plasma discharge treatment, ultraviolet laser treatment or chemical treatment, and (2) the step of adhering the polybutadiene formed article reduced in the water contact angle to a polar resin formed article.

The invention discloses a surface modification method of a polypropylene non-woven fabric. The surface modification method is an ultraviolet radiation-diazonium salt electrostatic self-assembly two-step method polypropylene non-woven fabric surface modification method which comprises the following steps: performing grafting polymerization on the surface of a PP non-woven fabric by using crylic acid under ultraviolet radiation or oxidation on the surface of the PP non-woven fabric by using ammonium persulfate ultraviolet radiation, thereby respectively obtaining surface containing carboxyl or sulfate anion; soaking the PP non-woven fabric surface modified material with the anion into a p-phenylenediamine diazonium salt solution for electrostatic self-assembly, and performing ultraviolet radiation treatment so as to convert ionic bonds of the electrostatic self-assembly product into covalent bonds, thereby obtaining a PP non-woven fabric surface modified material. By adopting the method, high-efficiency introduction of two polar groups on the surface of the PP non-woven fabric can be achieved, the water absorption rate of the PP non-woven fabric is increased, and the water contact angle of the PP non-woven fabric is reduced; due to introduction of aromatic amine, multiple chemical ways are developed for the PP non-woven fabric to couple and fix other functional molecules later, so that the PP non-woven fabric surface modified material can be used as a universal carrier material with active chemical property.