JPWO2020012076A5

JPWO2020012076A5 -

Info

Publication number: JPWO2020012076A5
Application number: JP2021500832A
Authority: JP
Publication date: 2022-07-14
Anticipated expiration: 2039-07-15

Claims

A water-dispersible composite structure containing a fiber layer.
-At least a portion of the fiber layer contains 50-90% by weight wood fiber, 10-50% by weight non-wood fiber and 0.1-20% by weight of binder calculated from the weight of the fiber. Formed by a fiber web or fiber sheet, at least a portion of the binder is a water-soluble polymer.
-A water-dispersible composite structure, wherein the fiber sheet or fiber web is manufactured by a wet molding technique.

The first aspect of claim 1, wherein the wood fiber is a bleached or unbleached, purified or unrefined fiber selected from the group of chemical pulp fiber, recycled fiber, mechanical pulp fiber and semi-mechanical pulp fiber and a combination thereof. Water-dispersible composite structure.

The non-wood fibers are selected from the group consisting of natural fibers, non-wood fibers and artificial fibers, particularly polymer fibers, eg, for example.
-Annual or perennial plant fibers such as hemp, flax, Kenaf, Bagus, cotton and straw, and combinations thereof-Thermoplastic fibers such as polylactic acid (PLA), glycolic acid polymer (PGA), polyhydroxyalkanoates. (PHA), Polyester (PO), Polyethylene terephthalate (PET), Polyester (PES), Polyvinyl alcohol (PVA)
-Composite fibers containing thermoplastic polymers-Mineral fibers, glass fibers-Regenerated cellulose fibers such as viscous fibers, lyocell fibers, rayon fibers-Selected from a group of fiber combinations selected from two or more of the above groups The water-dispersible composite structure according to claim 1 or 2.

The non-wood fibers are particularly 5-25 mm long, particularly 6-18 mm long, preferably 0.5 dtex-20 dtex thick, particularly 1-15 dtex thick, eg 1.5-10 dtex thick. The water-dispersible composite structure according to any one of claims 1 to 3, which is a short fiber having.

The binder may be a polyvinyl alcohol, a polyvinyl acetate dispersion, an ethyl vinyl alcohol dispersion, a polyurethane dispersion, an acrylic latex, a styrene butadiene dispersion, a binder based on fine cellulose, a binder based on a cellulose derivative, a biopolymer, or a starch derivative. Biopolymers based on biopolymers, natural rubber latex, alginate, guar gum, hemicellulose derivatives, chitin, chitosan, pectin, agar, xanthan, amylose, amylopectin, alternan, mutan, dextran, purulan, fructan, locust bean gum, carrageenan, glycogen, glyco The water-dispersible composite structure according to any one of claims 1 to 4, which is selected from the group consisting of saminoglycans, murains, bacterial pod polysaccharides, and similar substances and combinations thereof.

The invention according to any one of claims 1 to 5, wherein the first portion of the binder is formed of a water-soluble polymer or polymer mixture and the second portion of the binder is formed of a water-dispersible polymer or polymer mixture. Water-dispersible composite structure.

The water-dispersible composite according to any one of claims 1 to 6 , wherein the fiber web or fiber sheet further contains a sizing agent, particularly a reactive sizing agent such as alkyl ketene dima or alkenyl succinic anhydride. Structure.

The water-dispersible composite structure of claim 7 , wherein the sizing agent is mixed with one or more of the binders.

The water-dispersible composite structure according to any one of claims 1 to 8 , wherein the fiber web or fiber sheet can be dispersed in an aqueous medium during thrashing.

The water-dispersible composite structure according to any one of claims 1 to 9 , wherein the fiber web or fiber sheet can be dispersed in an aqueous medium at a temperature of 10 to 75 ° C. and a pH of 6 to 8.

The water-dispersible composite structure according to any one of claims 1 to 10, comprising a fiber web or a fiber sheet having a basis weight of 10 to 250 g / m ² , particularly about 20 to 200 g / m ² .

The water-dispersible composite structure according to any one of claims 1 to 11, comprising a fibrous web or a fibrous sheet selected from the group of non-woven fabric webs and non-woven fabric sheets.

A method for producing a water-dispersible composite structure containing a layer containing wood fibers, non-wood fibers, and a binder.
-Steps to carry the water-based fiber slash to the perforated support,
-The step of draining the liquid through the perforated support to form a fiber layer,
-A method comprising applying a binder onto the fiber layer to at least partially bond the fibers.
-The method, wherein the binder comprises an aqueous solution of a water-soluble polymer further containing a water-dispersible polymer.

The binder is applied onto the fiber layer as an effervescent aqueous composition, and the binder is applied onto the fiber layer.
The method according to claim 13 , wherein the foaming aqueous composition further contains an aqueous solution of a water-soluble polymer further containing a dispersed water-dispersible polymer.

The method according to claim 13 or 14 , wherein the wet molding is performed by a paper machine, a paperboard machine, or a wet non-woven fabric machine.

The method according to any one of claims 13 to 15 , wherein the binder is applied onto the fiber layer and then the fiber layer is dried until final drying.

The invention according to any one of claims 13 to 16 , wherein the binder is applied onto the fiber layer having a water content of 99 to 10% by weight, particularly 80 to 20% by weight, for example, 70 to 25% by weight. the method of.

13 . the method of.

The binder comprises an aqueous composition having a dry matter content of 1-50% by weight, such as 1-30% by weight, particularly 2.5-25% by weight.
The method according to any one of claims 13 to 18 , wherein the aqueous composition contains at least one water-soluble polymer and at least one water-dispersible polymer.

The binder comprises at least one water-soluble polymer and at least one water-dispersible polymer in a weight ratio of 1:20 to 20: 1, particularly 1:10 to 10:10, calculated based on the dried product of the polymer. The method according to any one of claims 13 to 19 , which is contained in.

The binder is polyvinyl alcohol, polyvinyl acetate dispersion, ethyl vinyl alcohol dispersion, polyurethane dispersion, acrylic latex, styrene butadiene dispersion, fine cellulose-based binder, cellulose derivative-based binder, biopolymer, and these. The method of any one of claims 13-20 , comprising a polymer selected from the group of combinations.

Claims 13 to 21, wherein the binder is an aqueous composition obtained by dissolving a water-soluble polymer in water to form an aqueous solution of the polymer, and then dispersing the water - dispersible polymer in the aqueous solution. The method described in any one of the above.

The binder is
At least one water-soluble polymer selected from the group of polyvinyl alcohol and polyvinyl acetate and combinations thereof is dissolved in water at an ambient pressure at a temperature of 10 to 100 ° C., particularly 15 to 100 ° C., and an aqueous solution of the polymer is used. Form and
Subsequently, at least one polymer selected from the group of polyurethane dispersion, acrylic latex, styrene-butadiene dispersion, and binder is dispersed in the solution at an ambient pressure of 20 to 100 ° C.
The method according to any one of claims 9 to 22, which is an aqueous composition prepared by.

50-99% by weight of the fibers in the fiber layer, particularly 60-90% by weight, are composed of cellulose or lignocellulosic fibers or mixtures thereof.
The method according to any one of claims 13 to 23 , wherein 1 to 50% by weight, particularly 10 to 40% by weight, is composed of non-wood natural fibers or artificial fibers or a combination thereof.

The wood fiber is a bleached or unbleached, refined or unrefined fiber selected from the group of chemical pulp fiber, recycled fiber, mechanical pulp fiber and semi-mechanical pulp fiber and combinations thereof.
The method according to any one of claims 13 to 24 , wherein in particular the wood fiber is selected from the group of essentially unrefined cellulose fibers, lignocellulosic fibers and combinations thereof.

The method according to any one of claims 13 to 25 , wherein the artificial fiber is selected from the group of regenerated cellulose fiber, synthetic fiber, synthetic thermoplastic fiber and a mixture thereof.

26. The method of claim 26 , wherein the regenerated cellulose fiber is selected from the group of viscose fibers, lyocell fibers, rayon fibers and mixtures thereof.

In any one of claims 13-27 , the non-wood natural fiber is selected from the group of annual or perennial fibers such as hemp, flax, kenaf, bagasse, cotton and straw, and combinations thereof. The method described.

The method according to any one of claims 13 to 28 , wherein the thermoplastic fiber is selected from the group of polyolefin fibers, polyester fibers and biopolymer fibers, and mixtures thereof.

A water-dispersible composite structure obtained by the method according to any one of claims 1 to 29 .

The method according to any one of claims 1 to 30 for the preparation of a non-woven product selected from a non-woven fabric web, a non-woven fabric sheet or a paper web or a group of paper sheets.