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A kind of wet-laid non-woven fabric for water treatment reverse osmosis membrane support base material and preparation method thereof

A reverse osmosis membrane and wet-laid non-woven technology, which is applied in the field of wet-laid non-woven fabrics for water treatment reverse osmosis membrane support substrates and its preparation, can solve the problems of complex preparation process, difficult control, and cost reduction. Achieve the effects of simple and reasonable preparation process, good controllability of production process, and improvement of finished product output and quality

Active Publication Date: 2022-08-09
宁波日新恒力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the manufacture of multi-layer non-woven fabrics with different longitudinal and transverse tensile strengths requires multiple inclined wire paper machines with different production processes, which is costly, complicated in preparation process, and difficult to control the longitudinal and transverse stretch ratios, which is not conducive to reducing costs for enterprises.
And this method does not make a solution for the above-mentioned coating process problems

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • A kind of wet-laid non-woven fabric for water treatment reverse osmosis membrane support base material and preparation method thereof
  • A kind of wet-laid non-woven fabric for water treatment reverse osmosis membrane support base material and preparation method thereof
  • A kind of wet-laid non-woven fabric for water treatment reverse osmosis membrane support base material and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0056] The present invention also provides the above-mentioned preparation method of the wet-laid non-woven fabric for the substrate of the reverse osmosis membrane support for water treatment, comprising the following steps:

[0057] a) Dispersion pretreatment of raw fiber: put the raw fiber into the fiber dispersing machine with water, continue to add water to the specified liquid level, and disperse the slurry to the fiber dispersed state; pump the fiber slurry prepared in the fiber dispersing machine to In the pulp storage tank, turn on the agitator of the pulp storage tank, add a dispersant, dilute and disperse the fiber slurry to a state where the fibers are single and suspended in water to prepare the fiber slurry;

[0058] The main fibers and hot-melt bonding fibers that make up the non-woven fabric have hydrophobic properties, so the dispersed state in water is not easy to maintain, and flocculation is easy to occur. To maintain the dispersed state of the fibers, it i...

Embodiment 1

[0076] A wet-laid non-woven fabric for water treatment reverse osmosis membrane support base material. ; The material of the surface layer is modified COPET, and the material of the inner core is PET; the weight ratio of the main fiber is 60% of the total weight, and the weight ratio of the hot melt adhesive fiber is 40% of the total weight;

[0077] The diameter of the main fiber is 1.0dtex and the fiber length is 6mm; the diameter of the hot melt adhesive fiber is 1.1dtex and the fiber length is 6mm; the COPET fiber on the surface has a melting point of 110 ℃ and a fiber ratio of 180 ℃ of 3:7, The melting point temperature of the inner core is 250°C; the melting point temperature of the main fiber is 250°C; the moisture absorption rate of the raw fiber is 0.4%, and the thermal shrinkage rate is 10%.

[0078] The dispersant is composed of PEO and polyacrylamide with a mass ratio of 8:2, (molecular weight 4 million, 2% relative to the weight of the raw fiber) is dispersed in w...

Embodiment 2

[0088] The difference between it and Example 1 is that it is based on Example 1. The difference is that the surface layer COPET fiber has a melting point of 110°C and a fiber ratio of 180°C with a melting point of 2:8, and the final surface density is 76g / cm. 2 The substrate non-woven fabric.

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Abstract

The invention discloses a wet-laid nonwoven fabric used for a backing base material of a reverse osmosis membrane for water treatment and a preparation method. The main fiber and the hot-melt adhesive fiber are used as raw material fibers, and the material of the main fiber is PET; The knot fiber includes the surface layer and the inner core; the material of the surface layer is modified COPET, and the material of the inner core is PET; the wet-laid non-woven non-woven technology is adopted, after fiber dispersion, oblique mesh molding, drying in a dryer, and then through The off-line machine is hot-melted and rolled into a whole, and its overall single-layer structure is the main feature. The obtained base non-woven fabric needs to have good surface coating, and the coating liquid has good penetration and will not penetrate. to the non-coated surface of the non-woven fabric of the base material; the present invention adopts a distributed control system, which has the characteristics of good product quality controllability, stable performance of the finished product, simple and reasonable operation of the preparation process, energy saving and consumption reduction, and can meet the requirements of anti-corrosion. Demand for permeable membrane production.

Description

technical field [0001] The invention belongs to the field of wet-laid non-woven fabrics for support base materials, and particularly relates to a wet-laid non-woven fabric for water treatment reverse osmosis membrane support base materials and a preparation method thereof. Background technique [0002] In recent years, with the progress of society and the development of economy, the demand for pure water in various fields continues to increase, and reverse osmosis membrane technology has developed rapidly. , sewage reuse and seawater desalination and other fields have been widely used, and the demand for reverse osmosis products has increased rapidly. [0003] The national and government departments attach great importance to water pollution and water safety, which has brought unprecedented opportunities to the development of reverse osmosis membranes. my country has introduced foreign membrane production lines since the 1980s. After decades of development, my country's me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H27/08D21H13/24D21H15/02D21H21/08D21H17/37D21H17/53
CPCY02A20/131
Inventor 不公告发明人
Owner 宁波日新恒力科技有限公司
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