CN1021837C - Waterproof strong nonwoven fabric of synthetic fibre and mfg. process - Google Patents

Abstract

The present invention discloses a new technology for making chemical fiber nonwoven fabric and novel waterproofing reinforced nonwoven fabric made by the technology, particularly a cement packaging bag made from vinylon as a raw material. A new reinforced waterproofing technology is added to an old technology to form the new technology. After soaking binding agents, roll compacting, drying and forming and through the processing of special reinforced waterproofing agents and drying with definite temperature and definite time, the physical property index, particularly cracking resistance and waterproofing property of the nonwoven fabric are greatly improved; thereby, the safe transportation capacity and the storage capacity of the cement packaging bag are enhanced. The present invention can be widely used in other packaging or decoration fields.

Description

Waterproof strong nonwoven fabric of synthetic fibre and mfg. process

The present invention relates to the manufacture method of a kind of bondedfibre fabric and it, or rather it to belong to a kind of be non-woven fabric and the manufacturing technique thereof that raw material is made with the chemical fibre.

At present, utilizing chemical fibre to make nonwoven fabric replaces high-intensity wooden oar paper to be widely used in packing and decoration field, especially for the high-intensity packing field, bag of cement for example, more show its distinctive superiority, this be because it not only can reduce the consumption of precious timber greatly, and because its peculiar folding strength and tear-resistant characteristics and reduced cement consume and environmental pollution greatly.Particularly nonwoven fabrics package bag technology is simple, and individual layer becomes bag, and cost is low and easy to be recycled, has been subjected to packing the particularly attention of cement packing industry since it comes out.In existing producing technology of non-woven fabrics, consist essentially of chemical fibre impurity elimination carded, fiber combing after the impurity elimination, utilize air lay then, become the dip bonding agent that is interspersed of net back fiber, and the pair roller roll compacting by padder goes out unnecessary adhesive and becomes certain thickness anti-textured fiber layer, handles moulding by drier then, is ready for use on after the packing of reeling and makes bag of cement or other bonded fabric product.Nonwoven fabric by this explained hereafter, machinery is simple, can not pollute with forming by excessive water consumption, finished product has the similar printing characteristic of air permeability and good, folding strength, crack resistance and wood pulp paper, the chemical fibre raw material that is adopted under this technology, vinylon for example, because the single brooming that is difficult for of its fiber, so the combination between the fiber is mainly finished by adhesive.Thereby the kind of the adhesive that is adopted and characteristic then play considerable effect.At present, the water-soluble binder that process using is single does not often reach desired binding viscosity, and single using polythene alcohol realizes that bonding then more seems particularly thorny.Its manufactured goods distinct issues show that water resistance is poor, wet strength is low, thus when finished product form local water stain after cracky, thereby limited this nonwoven fabric range of application greatly and used its environment.Increase nonwoven fabric intensity at present and improve its waterproof ability and become present urgency problem to be solved.

The objective of the invention is to improve the technology of usefulness, the technology circuit that strengthens waterproof ability and improve its breaking resistance is provided, the prescription that new composite adhesives particularly is provided is to improve nonwoven fabric intensity and water resistance.

Below be that main raw material is told main design concept of the present invention just with the polyvinyl chemical fibre.

One of crucial design of the present invention is to increase by one intensified waterproof PROCESS FOR TREATMENT in existing technology, in fact finishes padding this procedure separated into two parts of moulding in original technology.The road floods composite adhesives with reticular fibre earlier after air lay, through dry pre-profiling in dryer after the roll compacting, the fibrage of pre-profiling is flooded through the intensified waterproof agent once more, after roll compacting, send into once more to dry in the hot air drier and be treated as final products, through after this road waterproof intensive treatment, can increase the effect of original adhesive on the one hand, strengthen the breaking resistance of nonwoven fabric, can make the nonwoven surface layer produce not hydrophily on the other hand, strengthen its water resistance.Thereby the crucial adhesive that can produce such effect that just relates to naturally of this technology invention is on the problems such as process conditions that waterproof hardening agent proportioning and grasp are necessary and control time.

One of key of the present invention also is through repeatedly proportioning, experiment, detection and the synthetic adhesive agent prescription and the compound method that optimize.

The composite adhesives that bonding pre-profiling operation is adopted in the technology that the present invention relates to based on water miscible polyvinyl alcohol and finished emulsion, adds water distribution, adopts 154 at finished emulsion, also can add the white glue with vinyl of an amount of proportioning when 608-1,608Z, 168-1.Above proportioning raw material adds to stir under 75 ° of-85 ° of conditions of heating in the entry and mixes and can use.

What below provide is the Example formulations (by weight percentage) of above said composite adhesives:

Embodiment 1234

Polyvinyl alcohol 7% 10% 5.5% 3%

Finished product latex 10% 17% 12% 8%

White glue with vinyl 0% 10% 4% 2%

Water 83% 63% 77.7% 87%

Wherein finished emulsion adopts 432 or 573 among the embodiment 2, adopts among 573 embodiment 4 among the embodiment 3 and gets 433.

Key technology of the present invention also is successfully to have prepared the intensified waterproof agent, the cationic hydroxy emulsion is mainly adopted in the intensified waterproof agent, the aqueous solution of silicone oil and zinc acetate mixing match, can add small amount of toluene in order to accelerate mixed uniformly speed, the intensified waterproof agent of making according to a certain ratio, in the nonwoven fabric hardening agent of dipping pre-profiling effective ingredient can with add adhesive and contact, thereby under the effect of hot air drier heating, can produce more firm adhesion and strengthen interfibrous active force, strengthened the breaking resistance of nonwoven fabric, in addition because the surface coated of intensified waterproof agent, the anti-water characteristic that has added nonwoven fabric integral body, when special use polyvinyl is done raw material, exercising result is except can keeping the soft fracture resistance of former nonwoven fabric, can also produce the without water stained on its surface characteristic, but not influence printing performance, thereby can realize improving intensity, the purpose of waterproof, below effective formulation Example (by weight percentage) of given intensified waterproof agent:

Embodiment 1234

Cationic hydroxy emulsion 15% 10% 8% 4%

Silicone oil 8% 15% 4% 9%

Zinc acetate 14% 20% 8% 17%

Toluene 3% 1.7% 1.5% 0%

Water 60% 53.3% 78.5% 70%

Wherein the effect of toluene is to quicken broad mixing, thereby suitably heats under the condition that does not add toluene and also can finish, and can flood the nonwoven fabric of pre-profiling by above proportioning joining the preparation of glue in-tank mixing.

Behind the dipping intensified waterproofing agent of pre-profiling nonwoven fabric, send into the interior roll compacting of padder and go out unnecessary reagent, send into the steam engine inner drying again, its dry temperature is controlled between 80-160 ℃, between this temperature, can finish between the chemical analysis and fully reaction, temperature crosses that low then the intensified waterproof effect is bad, the too high nonwoven fabric finished product that then makes of temperature hardens, the pliability variation, and then have influence on folding strength, should be controlled between 3-7 minute drying time, and the time is too short, the long bad same defect of temperature control that all can produce.

Through the nonwoven fabric moulding of final drying moulding can coiling as the base stock of bag of cement etc.

The nonwoven fabric that produces by above technology and prescription owing to forced the intensified waterproof processing, its physical technique index significantly improve.(press 100g/m such as following during after testing through the nonwoven fabric index before and after the WATER REPELLENT TREATMENT ²Sample detection)

Anti-broken kgf/cm ²Tearability g elongation % air permeability ml/min waterproof

Old technology 7 600＞10 200 are not

New technology 15 1580＞19.67 273.5 can

The nonwoven of new and old explained hereafter closes the index contrast, although the nonwoven production cost slightly improves under the new technology, process equipment and flow process are also comparatively complicated, and its Main physical performance refers to The mark performance but has bigger improvement, particularly be used for making cement package bags, its anti-crack ability significantly improves, but new technology non-woven bag dress cement freely falling body 20 times rhegma not when one meter drop test, particularly it has obvious fire resistance characteristic, makes in the transportation of cement and the preservation process further to have reduced loss. When as other field, all be well received such as fertilizer packaging, wallpaper and extraordinary ornament materials.

Claims (7)

1, a kind of new technology of utilizing chemical fibre to make nonwoven fabric, its basic technology route comprises the impurity elimination carded, the fiber combing, air lay, pad moulding, bake drying, baling, it is characterized in that padding the moulding process stage comprises adhesion-molded and intensified waterproof and handles two procedures, in adhesion-molded operation with the fiber web roll compacting of composite adhesives dipping after drier pre-profiling nonwoven fabric flood once more, send into the pre-hot dryer inner drying of steam after the roll compacting and be treated to final products with the intensified waterproof agent.

2,, it is characterized in that the composite adhesives that adopted is by following component proportioning (percentage by weight) in adhesion-molded operation according to the said nonwoven fabric new technology of claim 1:

Polyvinyl alcohol 3%-10%

Finished product latex 8%-17%

Water 64%-87%

White glue with vinyl 0%-10%

Get final product after the mixing that stirs under 75 ℃-80 ℃ by proportioning.

3, according to the said nonwoven fabric new technology of claim 1, the intensified waterproof agent that its feature is adopted in the intensified waterproof treatment process is by following component proportioning (weight percent):

Cationic hydroxy emulsion 4%-15%

Silicone oil 4%-15%

Zinc acetate 8%-20%

Toluene 0%-3%

Water 53.3%-78.5%

By proportioning silicone oil, zinc acetate, cationic hydroxy emulsion are evenly mixed and to be dissolved among toluene, the water mixed liquid.

4, according to the anti-cloth new technology of the said nothing of claim 1, it is characterized in that when the anti-cloth of the nothing of intensified waterproof agent dipping and roll compacting aftershaping is sent into the pre-hot dryer inner drying of steam, its bake out temperature is controlled between 80-160 °, is controlled at its drying time 3-7 minute.

5, a kind of nonwoven fabric of synthetic fibre, comprise chemical fibre in its component, make the adhesive and the modifier composition that produce adhesion between the chemical fibre, it is characterized in that also including the strong waterproofing agent composition in this nonwoven fabric component, form uniform membrane waterproofing on the surface of nonwoven fabric after the intensified waterproof agent drying.

6,, it is characterized in that adhesive is by following proportioning components (percentage by weight) according to the said nonwoven fabric of synthetic fibre of claim 5:

Polyvinyl alcohol 3%-10%

Finished product latex 8%-17%

Water 64%-87%(oven dry back volatilization)

White glue with vinyl 0%-10%

7,, it is characterized in that strong waterproofing agent is by following component proportioning according to the said nonwoven fabric of synthetic fibre of claim 5:

Cationic hydroxy emulsion 4%-15%

Silicone oil 4%-15%

Zinc acetate 8%-20%

Toluene 0%-3%

Water 53.3%-78.5%(oven dry back volatilization)