A kind of cellulose composite waterproof film and preparation method thereof

A waterproof film, cellulose technology, applied in the direction of flat products, other household appliances, coatings, etc., can solve the problems of limited use range, poor mechanical properties of polyester and polyurethane film moisture permeability, long synthesis route, etc. The effect of avoiding the reduction of moisture permeability, excellent moisture permeability, and controllable moisture permeability

Active Publication Date: 2021-08-31
THE HONG KONG POLYTECHNIC UNIV
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Problems solved by technology

[0006] Traditional research focuses on the design of polyester and polyurethane molecular chains, resulting in complex molecular structures, relatively long synthetic routes and high cost of process routes, and the moisture permeability and mechanical properties of the prepared polyester and polyurethane films are often not very good. it is good
with DuPont Active For example, its moisture permeability is 13000~15000g m 2 / 24h (T=23°C, RH=50%, Standard-ASTM E96 BW), but its tensile breaking strength is only 14-15MPa, and its moisture permeability can meet the needs of conventional waterproof and moisture-permeable clothing preparation, but due to its strength low, which limits its use

Method used

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  • A kind of cellulose composite waterproof film and preparation method thereof
  • A kind of cellulose composite waterproof film and preparation method thereof
  • A kind of cellulose composite waterproof film and preparation method thereof

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preparation example Construction

[0035] The application also provides the preparation method of the cellulose composite waterproof film, such as figure 1 As shown, it specifically includes the following steps:

[0036] A) dissolving 70-100 parts by weight of cellulose pulp, 0-20 parts by weight of ultrafine functional materials and 0-10 parts by weight of additives in the solution, and stirring to obtain a cellulose solution;

[0037] B) Degassing the cellulose solution and forming a film to obtain an initial cellulose film;

[0038] C) coagulating and exchanging the cellulose initial film in a coagulation bath, and obtaining a cellulose composite waterproof film after drying.

[0039] The cellulose composite waterproof film prepared by the present application does not have a porous structure, so there will be no clogging of micropores during use, thereby avoiding the problem of lower moisture permeability in later use.

[0040] In the above-mentioned specific preparation process, firstly, the cellulose pul...

Embodiment 1

[0047] A cellulose and cellulose composite material waterproof film with high moisture permeability and a preparation method thereof, comprising the following steps (the following parts and proportions not specially marked are all parts by weight):

[0048] Preparation of cellulose waterproof and moisture-permeable film: add 100 parts of absorbent cotton to the container, add a certain amount of sodium hydroxide (10%)-urea (19%) mixed aqueous solution, and prepare a absorbent cotton mixture with a solid content of 5%. Stir the absorbent cotton mixture at 25°C with a rotation speed of 800rpm until it is completely dissolved, and then use an ultracentrifuge to remove air bubbles to obtain a cellulose solution with good transparency; Coating process), then put the wet film into 15°C, 90% ethanol aqueous solution for ion exchange and regeneration, take it out after 12 hours, rinse it with water, and then dry it in an oven at 30°C for 24 hours to prepare the thickness 0.01mm high m...

Embodiment 2

[0050] A cellulose and cellulose composite material waterproof film with high moisture permeability and a preparation method thereof, comprising the following steps (the following parts and proportions not specially marked are all parts by weight):

[0051] Preparation of carbon black-cellulose composite material waterproof and moisture-permeable film: add 99 parts of absorbent cotton, 1 part of carbon black particles (specification: 2 μm) in the container, and then add a certain amount of sodium hydroxide (10%)-urea (19% ) mixed aqueous solution to prepare a absorbent cotton-carbon black mixture with a solid content of 5%, stir the absorbent cotton mixture at -25°C and a rotating speed of 800rpm until it is completely dissolved, and then use an ultracentrifuge to remove air bubbles to obtain a cellulose solution with good transparency , and then use a wire rod (specification: 20 μm) to make a wet film (coating process) on a glass plate, then put the wet film in 15 ° C, 90% eth...

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Abstract

The invention provides a cellulose composite waterproof film, which is prepared by 70-100 parts by weight of cellulose pulp, 0-20 parts by weight of ultrafine functional materials and 0-10 parts by weight of auxiliary agents; the application also provides The preparation method of the cellulose composite waterproof film includes raw material mixing, low-temperature dissolution, defoaming, film formation and coagulation bath in order to finally obtain a cellulose composite waterproof film with a thickness of 0.01 mm to 0.05 mm. The moisture permeability of the film prepared by the present invention is greater than 10000g·m 2 / 24h, and has high tensile breaking strength and hydrostatic pressure resistance. The cellulose composite waterproof and permeable membrane has broad application prospects in the fields of waterproof and moisture-permeable clothing, architectural structural fabric membranes, and smart wearables.

Description

technical field [0001] The invention relates to the technical field of waterproof and moisture-permeable films, in particular to a cellulose composite waterproof film and a preparation method thereof. Background technique [0002] Waterproof and moisture-permeable film material is a functional polymer material with good market prospects, and its market demand is increasing day by day. At present, there are many types of waterproof and moisture-permeable films on the market. According to the film structure and moisture-permeable principle, they are mainly divided into two categories: ① porous waterproof and moisture-permeable films; ② non-porous waterproof films. [0003] Porous waterproof and moisture-permeable film is a kind of film containing a large number of micro-pores (generally 0.5-20 μm). By controlling the size, number and arrangement of micro-pores, the selective permeability to water vapor can be realized, so as to realize the permeability of the film. Moisture a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/02C08K3/04C08K3/36C08K3/34C08K3/30C08J5/18B29C41/12B29C71/00B29K1/00B29L7/00
CPCB29C41/12B29C71/0009B29C2071/0027B29C2071/0045B29K2001/00B29L2007/00C08J5/18C08J2301/02C08K3/04C08K3/34C08K3/36C08K2003/3045C08K2201/003
Inventor 胡金莲石朔朱坤坤
Owner THE HONG KONG POLYTECHNIC UNIV
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