WO2017091976A1

WO2017091976A1 - Expansion flame retardant system for mattress or pillow inner-sleeve filler flame retardation and method therefor

Info

Publication number: WO2017091976A1
Application number: PCT/CN2015/096123
Authority: WO
Inventors: 陈杰
Original assignee: 陈杰
Priority date: 2015-12-01
Filing date: 2015-12-01
Publication date: 2017-06-08

Abstract

Disclosed is an expansion flame retardant system for mattress or pillow inner-sleeve filler flame retardation and a method therefor. Yarns or cloth with cellulosic fibres or cellulosic fibres blended with chemical fibres as a raw material are processed and treated using an inorganic flame retardant containing nitrogen and phosphorus, so that the yarns or the cloth and the inorganic flame retardant containing nitrogen and the phosphorus constitute the expansion flame retardant system; by using a covering expansion function achieved when the inorganic flame retardant containing nitrogen and phosphorus is heated, the yarns or the cloth have a flame retardance; the yarns or the cloth are made into an inner sleeve of a mattress or a pillow, and the inner sleeve wraps a filler, so that in case of open fire on the mattress or the pillow, flames cannot pass through the inner sleeve to ignite the filler, and the flame retardation of the mattress or the pillow is realized, which passes the America 16CFR1633 mattress flame retarding standard test. The price of the flame retardant mattress inner sleeve treated by the method of the present invention is lowered by half in comparison with a mattress inner sleeve formed by weaving glass fibre flame retardant core-spun yarns. In addition, the former is degradable in the natural environment after being discarded, while the glass fibre contained in the latter cannot be naturally degraded, which may pollute the environment; besides, smoke resulting from the former is obviously less than that generated resulting from the latter in outbreak of fire.

Description

Intumescent flame retardant system for flame retardant of mattress or pillow inner sleeve filling and method thereof

Technical field

The invention relates to the field of flame retardant of mattress or pillow inner sleeve filling, in particular to an intumescent flame retardant system for flame retardant of a mattress or pillow inner sleeve filling and a method thereof.

Background technique

Since July 2007, mattresses sold in the US market must pass the 16CFR1633 mattress flame retardant standard test.

The mattress is divided into a spring mattress and a stuffed mattress filled with sponge, latex or the like. In order for the mattress to pass the 16CFR1633 mattress flame retardant standard test, the heat release value of the mattress when it is exposed to open flame must be lower than the standard allowable value.

The key to controlling the heat release value is to ensure that the flammable filler of the mattress is not ignited to cause a fire when it is tested for open flame.

At present, mattresses sold in the US market mainly use two ways to protect the filling from being ignited. First, a flame-retardant non-woven fabric is made of a phosphorus-based flame-retardant viscose fiber, and a flame-retardant non-woven fabric is used to make a mattress inner sleeve, and the filler is completely wrapped. The second is to use the glass fiber filament as the inner core, the flame retardant fiber as the outer fiber, the flame-retardant glass fiber core-spun yarn, and then the flame-retardant glass fiber core-spun yarn to weave the knitting weft-knitted cylinder cloth, and then The cylindrical cloth (usually a wicking cloth or rib cloth with a large elasticity) is directly placed on the filler, and the two ends are locked to form a mattress inner sleeve.

The principle of the above two methods is to design a layer of mattress inner sleeve between the filler and the mattress jacket. When the mattress jacket is burned, the flame can not pass through the inner sleeve made of flame retardant material, thereby protecting the filler. Not ignited.

Summary of the invention

It is an object of the present invention to provide an intumescent flame retardant system and method for flame retardant use in mattress or pillow inner casing fillers.

The technical solution of the present invention is as follows:

An intumescent flame retardant system for flame retardant of a mattress or pillow inner sleeve filler comprises a phosphorus-containing nitrogen-containing inorganic flame retardant and a carbon source, and the phosphorus-containing nitrogen-containing inorganic flame retardant is used as an acid source of the flame retardant system And a gas source, wherein the carbon source is a cellulose fiber or a blend of cellulose fibers and chemical fibers, and the carbon source is impregnated with the aqueous solution of the phosphorus-containing nitrogen-containing inorganic flame retardant and dehydrated and dried. The phosphorus-containing nitrogen-containing inorganic flame retardant constitutes an intumescent flame retardant system.

Preferably, the cellulose fiber is one or more of natural cotton, bamboo fiber, viscose fiber, corn fiber, hemp fiber, wood pulp fiber, soybean fiber, more preferably bamboo fiber, because a The raw materials are easy to obtain and the price is relatively low; b. Bamboo fiber has instant water absorption and is easy to be impregnated; c. Bamboo fiber is a natural germicidal fiber, which has sterilization and inhibition on bacteria that are in daily contact with Escherichia coli and Staphylococcus aureus. The role of bacteria, which is essential for the application environment of the mattress inner sleeve and the inability to unload the washing.

The content of the cellulose fibers in the blend of the cellulose fibers and the chemical fibers is greater than 11% by mass, and more preferably, the content of the cellulose fibers in the blend is not less than 50% by mass.

Preferably, the phosphorus-containing nitrogen-containing inorganic flame retardant is one or more of liquid ammonium polyphosphate, water-soluble ammonium polyphosphate, diammonium hydrogen phosphate or ammonium dihydrogen phosphate.

The invention also discloses a preparation method of the yarn with the intumescent flame retardant system and an application thereof for manufacturing a mattress or a pillow inner sleeve, and the preparation method is as follows:

1) a cellulose fiber bobbin or a blended bobbin of cellulose fiber and chemical fiber is processed into a fluffy bobbin which is fluffyly wound on a hollow bobbin by a loose winder;

2) completely saturating the fluffy bobbin in an aqueous solution containing phosphorus and nitrogen-containing inorganic flame retardant;

3) Dehydration and drying.

The invention also discloses a preparation method of a cloth having the intumescent flame-retardant system and an application thereof for manufacturing a mattress or a pillow inner sleeve, and the preparation method is as follows:

1) completely impregnating a cellulose fiber cylinder cloth or a blended cylindrical cloth of cellulose fibers and chemical fibers in an aqueous solution containing a phosphorus-containing nitrogen-containing inorganic flame retardant;

2) Drying and drying.

In the method for preparing the yarn or cloth, the concentration of the aqueous solution of the phosphorus-containing nitrogen-containing inorganic flame retardant is immersed and dried, and the fine phosphorus-nitrogen mixed powder can be uniformly attached to the surface of the yarn and the fibers. Preferred in the present invention are aqueous solutions of liquid ammonium polyphosphate or water-soluble ammonium polyphosphate, ammonium dihydrogen phosphate, and diammonium hydrogen phosphate, which are disposed in a 1:1 volume ratio with water. If it is not diluted, the inner cloth will feel hard and become sturdy.

The dehydration or dry-drying process is a conventional process in the corresponding field, and the drying temperature is 100-110 °C.

The flame retardant method for mattress or pillow filling is to process the yarn or cloth with phosphorus-containing nitrogen-containing inorganic flame retardant, so that the yarn or cloth and the phosphorus-containing nitrogen-containing inorganic flame retardant constitute an intumescent flame-retardant system, and the use thereof The phosphorus-containing nitrogen inorganic flame retardant has a covering expansion function when it is heated, so that the yarn or the cloth has flame retardancy, and the yarn or cloth is made into an inner sleeve of a mattress or a pillow, and the inner sleeve is wrapped with a filler to make the mattress Or when the pillow is in an open fire, the flame cannot pass through the inner sleeve to ignite the filler, and the flame of the mattress or the pillow is achieved.

The yarns and cloths impregnated by the method of the present invention are ultimately used in mattress or pillow inner sleeves. Because the inner sleeve is protected by a mattress or a pillow coat, and the mattress manufacturer controls the cost, considering the fire safety, the inner sleeve of the mattress is made non-detachable, that is, the inner sleeve is not washed after subsequent use. Therefore, the flame-retardant treatment method proposed by the present invention is disposable non-water-resistant flame retardant, but this does not hinder the implementation of the present invention as a mattress or pillow inner sleeve.

The flame retardant mechanism of the invention is: phosphorus-containing nitrogen-containing inorganic flame retardant, such as ammonium polyphosphate, which decomposes and releases phosphoric acid and polyphosphoric acid when heated, both of which are strong dehydrating agents, which can make the fiber inside the mattress The plain yarn is rapidly dehydrated to become coke-like. The simultaneously generated non-volatile phosphorus oxide and polyphosphoric acid cover the surface of the yarn to form a non-combustible carbon layer. Since the inner cover of the mattress becomes a fine carbon mesh which does not burn and has an insulating effect after the open flame, the flame cannot pass through the carbon mesh to ignite the filler, thereby realizing the flame retardancy of the mattress.

The phosphorus-containing nitrogen-containing inorganic flame retardant is an intumescent flame retardant having both an acid source (phosphoric acid) and a gas source (nitrogen), and constitutes an intumescent flame retardant system with a carbon source (cellulose fiber). Phosphoric acid promotes rapid dehydration and carbonization of cellulose yarns. During the formation of the carbon layer, part of the ammonia and nitrogen decomposed by combustion enters the carbon layer, causing the carbon layer to expand and expand. When the yarn is completely wrapped, the thickness of the carbon layer is increased, and the carbon layer is incombustible and separated. The characteristics of heat and oxygen barrier, so the carbon mesh formed by the mattress inside the open fire also has the characteristics of no burning, heat insulation and oxygen barrier. Even under the continuous burning of the flame, it does not burn, does not deform, does not melt. Shrink, protect the filler from being ignited.

Ammonium polyphosphate decomposes nitrogen, ammonia, carbon dioxide and other gases during combustion and heat. These gases are not easy to burn, so that the air around the flame can be diluted, the oxygen content is reduced, the flame self-extinguishes, and the flame retardant effect is achieved.

The price of the flame-retardant mattress inner sleeve treated by the method of the present invention is one-half lower than that of the mattress inner sleeve woven with the glass fiber flame-retardant core yarn. At the same time, the former can be degraded in the natural environment after being discarded, and the glass fiber contained in the latter cannot be naturally degraded and pollutes the environment. In addition, compared with the latter, the former produces significantly less smoke in the event of a fire.

DRAWINGS

Figure 1 is a schematic illustration of a cloth wrap filler processed by the method of the present invention.

detailed description

Liquid ammonium polyphosphate is an agricultural liquid fertilizer with phosphorus content greater than 34% and nitrogen content greater than 10%. In addition to liquid ammonium polyphosphate, low polymerization degree water-soluble ammonium polyphosphate and diammonium hydrogen phosphate can be used. And ammonium dihydrogen phosphate, the same mechanism of action, can achieve the same flame retardant effect.

Ammonium polyphosphate (APP), with the formula (NH4PO3)n, is an environmentally friendly, non-toxic, low-smoke intumescent flame retardant. The high degree of polymerization of ammonium polyphosphate is mainly used for fire retardant coatings and plastics. The low degree of polymerization of ammonium polyphosphate is mainly used for agricultural fertilizers and fire extinguishing agents.

The flame-retarded yarn and the mattress cylinder inner cloth may be made of natural cotton, bamboo fiber, viscose fiber, corn fiber, hemp fiber, wood pulp fiber, soybean fiber or the like, or may be Blended with cellulose fibers and chemical fibers such as polyester.

Example 1

In this embodiment, the liquid ammonium polyphosphate is used as the flame retardant liquid, and the bamboo fiber is used as the cylindrical cloth material, and the yarn is treated by the normal temperature dipping method to make the yarn have flame retardancy, and is used for weaving the weft knitting cylinder inner cloth. For the inner sleeve of the mattress.

The yarn impregnation process of the present embodiment adopts the process of the yarn impregnation method as follows:

1 dosing liquid: liquid ammonium polyphosphate and water are stirred 1:1 into a diluent for use;

2 winding: the bobbin is processed into a fluffy bobbin which is fluffyly wound on the hollow bobbin by a loose winder;

3 impregnation: completely soak the fluffy bobbin in the diluent;

4 dehydration: drying in a dehydrator;

5. Drying: drying the fluffy yarn drum in the drying room;

6 trough: the fluffy bobbin is wound on a trough machine into a compact bobbin that meets the weaving conditions;

7 packaging.

As shown in Fig. 1, the yarn treated by the above impregnation process is woven into a knitted weft-knitted cylindrical cloth, and the wrapped sponge filler is cut as a test sample, and the test sample is then sewed with a polyester mattress cloth. In the figure, 1 is a filler, 2 is an inner sleeve, and 3 is a jacket. In 2015, SGS-CSTC Standard Technical Service Co., Ltd. Anji Branch tested according to the US 16CFR1633 mattress flame retardant standard method. The test result is the test sample. The product is tested by the US 16CFR1633 mattress flame retardant standard. The sponge did not burn during the test, but the jacket was partially burned and the flame spread.

Example 2

In this embodiment, the liquid ammonium polyphosphate is used as the flame retardant liquid, and the natural cotton is used as the cylindrical cloth material, and the knitted weft knitted cylindrical cloth is treated by the normal temperature dipping method to make it have flame retardancy and is used for the inner sleeve of the mattress.

The impregnation process of the knitting weft-knitted cylinder cloth of the present embodiment adopts the padding process as follows:

1 dosing liquid: liquid ammonium polyphosphate and water 1:1 stirring into a dilution liquid into the rolling stock tank;

2 impregnation: the cylinder cloth is introduced into the rolling stock tank to fully wet;

3 Rolling: use the elastic cloth of the rolling car to roll out the excess liquid in the cylinder cloth;

4 drying: the cylinder cloth is introduced into a continuous oven for drying, the oven temperature is 100-110 ° C;

5 roll packaging.

Since the natural cotton fiber absorbs water more than the bamboo fiber (the bamboo fiber absorbs about 2.5 times of the natural cotton), the embodiment needs to use a slightly longer immersion time than the bamboo fiber yarn impregnation, and the round processed according to the above impregnation process The cloth cloth was cut and wrapped with a sponge filler as a test sample, and the test sample was then sewed with a polyester mattress cloth.

Test samples were taken by self-test methods. Place the experimental sample on the combustion rack, simulate the 16CFR1633 standard, use the flame generated when the cotton is burned, and continue to burn the side of the sample at a fixed point for 120 seconds (16 CFR1633 standard burning time is 50 seconds). The test result, the sponge does not burn, but the jacket Partially burned and flame spread.

Example 3

In this embodiment, the diammonium hydrogen phosphate is used as the flame retardant liquid, and the hemp fiber is used as the cylindrical cloth material, and the knitting weft knitted cylindrical cloth is treated by the normal temperature dipping method to make it have flame retardancy and is used for the inner sleeve of the mattress.

1 dosing liquid: dilute aqueous solution of diammonium phosphate and water are arranged into a distillate storage tank according to a 1:1 volume ratio;

5 roll packaging.

The cylindrical cloth treated with the above impregnation process was used to cut and wrap the sponge filler as a test sample, and the test sample was then sewed with a polyester mattress cloth.

Test samples were taken by self-test methods. The experimental sample was placed on the combustion rack, and the 16CFR1633 standard was simulated. The flame generated by the burning of the cotton cloth was used to continuously burn the side of the sample for 120 seconds. The test result showed that the sponge did not burn, but the jacket was partially burned and the flame spread.

Example 4

In this embodiment, the water-soluble ammonium polyphosphate is used as the flame retardant liquid, and the viscose fiber (synthetic cotton) is used as the cylindrical cloth material, and the knitting weft knitted cylindrical cloth is treated by the normal temperature impregnation method to make the flame retardant and used for the bed. Pad inner sleeve.

The knitting weft knitting cylindrical cloth dipping process of the present embodiment is the same as that of the third embodiment except that the water-soluble ammonium polyphosphate is used instead of the diammonium hydrogen phosphate by the padding process.

The dip-processed cylindrical cloth was used to cut and wrap the sponge filler as a test sample, and the test sample was then sewed with a polyester mattress cloth.

Example 5

In this embodiment, the ammonium dihydrogen phosphate is used as the flame retardant liquid, and the wood pulp fiber (Tiansi) is used as the cylindrical cloth material, and the knitting weft knitted cylindrical cloth is treated by the normal temperature dipping method to make the flame retardant and used for the mattress. Inner sleeve.

The knitting weft knitting cylindrical cloth impregnation process of the present embodiment is the same as that of the third embodiment except that ammonium dihydrogen phosphate is used instead of diammonium hydrogen phosphate in the padding process.

The liquid ammonium polyphosphate used in the examples is an agricultural fertilizer which is mainly used for impregnating wood when used as a flame retardant liquid. Because its flame retardant effect is disposable, non-water resistant, its application range is greatly limited, so it is rarely used to impregnate textile yarns and textiles. In the invention, the inner sleeve of the mattress is non-detachable and does not need to be washed by water, which avoids the shortcomings of the liquid stainless ammonium polyphosphate which is not resistant to water washing, and the water-soluble ammonium polyphosphate and hydrogen phosphate of the invention The effect of diammonium or ammonium dihydrogen phosphate is similar.

The intumescent flame retardant system consists of an acid source, a gas source and a carbon source. The phosphorus-containing nitrogen-containing inorganic flame retardant has the former two. The invention selects cellulose fibers such as natural cotton and bamboo fiber as raw materials because these raw materials are all polyhydroxy polymers with high carbon content and are good carbon sources. Due to the application of the intumescent flame retardant system, the carbon residue rate of the yarn on the mattress is increased, the thickness of the carbon layer is increased, and the carbon mesh formed by the mattress inside the open fire is ensured, and the flame continues for a long time. It does not burn, does not deform, does not melt, and does not break under burning. This is the key point to ensure that the mattress can pass the 16CFR1633 American standard test.

Claims

An intumescent flame retardant system for flame retardant of a mattress or pillow inner sleeve filler, characterized by comprising a phosphorus-containing nitrogen-containing inorganic flame retardant and a carbon source, and the phosphorus-containing nitrogen-containing inorganic flame retardant is used as a flame retardant An acid source and a gas source of the system, wherein the carbon source is a cellulose fiber or a blend of cellulose fibers and chemical fibers, and the carbon source is dried by dipping the aqueous solution containing the phosphorus-containing nitrogen-containing inorganic flame retardant Thereafter, the phosphorus-containing nitrogen-containing inorganic flame retardant constitutes an intumescent flame retardant system.
The intumescent flame retardant system according to claim 1, wherein the cellulose fiber is one or more of natural cotton, bamboo fiber, viscose fiber, corn fiber, hemp fiber, wood pulp fiber, and soybean fiber. The cellulose fiber has a mass percentage of the cellulose fiber in the blend of the cellulose fiber and the chemical fiber of more than 11%.
The intumescent flame retardant system according to claim 1, wherein the phosphorus-containing nitrogen-containing inorganic flame retardant is one of liquid ammonium polyphosphate, water-soluble ammonium polyphosphate, diammonium hydrogen phosphate or ammonium dihydrogen phosphate. Kind or more.
A yarn having the intumescent flame retardant system according to any one of claims 1 to 3, characterized in that the yarn is prepared by:

1) a cellulose fiber bobbin or a blended bobbin of cellulose fiber and chemical fiber is processed into a fluffy bobbin which is fluffyly wound on a hollow bobbin by a loose winder;

2) completely saturating the fluffy bobbin in an aqueous solution containing phosphorus and nitrogen-containing inorganic flame retardant;

3) Dehydration and drying.
A fabric having the intumescent flame retardant system according to any one of claims 1 to 3, characterized in that the preparation method of the cloth is:

1) completely impregnating a cellulose fiber cylinder cloth or a blended cylindrical cloth of cellulose fibers and chemical fibers in an aqueous solution containing a phosphorus-containing nitrogen-containing inorganic flame retardant;

2) Drying and drying.
The use of the yarn of claim 4 for the manufacture of a mattress or pillow inner sleeve.
The use of the cloth of claim 5 for the manufacture of a mattress or pillow inner cover.
A flame retardant method for mattress or pillow filling, characterized in that a yarn or cloth is processed by using a phosphorus-containing nitrogen-containing flame retardant, and the yarn or cloth and the phosphorus-containing nitrogen-containing flame retardant constitute an intumescent flame-retardant system The use of a phosphorus-containing nitrogen-containing flame retardant to cover the expansion function when heated, so that the yarn or cloth has flame retardancy, and the yarn or cloth is made. The inner sleeve of the mattress or the pillow is wrapped with the inner covering, so that when the mattress or the pillow encounters an open fire, the flame cannot pass through the inner sleeve to ignite the filling, thereby realizing the flame retardancy of the mattress or the pillow.