阅读说明：本技术 一种阻燃篷布及其制备工艺 (Flame-retardant tarpaulin and preparation process thereof ) 是由 顾全 陆勇 于 2021-09-25 设计创作，主要内容包括：本发明涉及纺织品制造的技术领域,公开了一种阻燃篷布及其制备工艺,包括涤纶长丝牛津布以及附着在涤纶长丝牛津布外层的阻燃层,其特征在于：所述阻燃层由包括如下重量份的原料组成：聚氨酯整理剂70～90份、溶剂44～66份、双层微胶囊相变材料25～45份、聚磷酸铵10～22份、分散剂3～7份；所述双层微胶囊相变材料由内至外依次由聚乙二醇芯材、氧化石墨烯次外层以及聚脲外层构成。本申请中使用特制阻燃剂,能够在涤纶篷布上形成一层牢固的阻燃层,阻燃层受热能够形成致密的隔热层,有效地提高涤纶篷布的阻燃性能；并且本申请使用的阻燃剂高效,能够以较少的涂覆量能够达到较好的阻燃效果,阻燃剂对涤纶篷布的强度几乎无影响。(The invention relates to the technical field of textile manufacturing, and discloses a flame-retardant tarpaulin and a preparation process thereof, wherein the flame-retardant tarpaulin comprises polyester filament oxford and a flame-retardant layer attached to the outer layer of the polyester filament oxford, and is characterized in that: the flame-retardant layer is composed of the following raw materials in parts by weight: 70-90 parts of polyurethane finishing agent, 44-66 parts of solvent, 25-45 parts of double-layer microcapsule phase change material, 10-22 parts of ammonium polyphosphate and 3-7 parts of dispersing agent; the double-layer microcapsule phase change material is composed of a polyethylene glycol core material, a graphene oxide secondary outer layer and a polyurea outer layer from inside to outside in sequence. According to the application, a special flame retardant is used, a firm flame-retardant layer can be formed on the polyester tarpaulin, and a compact heat insulation layer can be formed by heating the flame-retardant layer, so that the flame retardant property of the polyester tarpaulin is effectively improved; and the fire retardant that this application used is high-efficient, can reach better flame retardant efficiency with less coating volume, and the fire retardant hardly has the influence to the intensity of dacron tarpaulin.)

1. The utility model provides a fire-retardant tarpaulin, includes dacron filament oxford and adheres to the outer fire-retardant layer of dacron filament oxford, its characterized in that: the flame-retardant layer is composed of the following raw materials in parts by weight: 70-90 parts of polyurethane finishing agent, 44-66 parts of solvent, 25-45 parts of double-layer microcapsule phase change material, 10-22 parts of ammonium polyphosphate and 3-7 parts of dispersing agent;

the double-layer microcapsule phase change material is composed of a polyethylene glycol core material, a graphene oxide secondary outer layer and a polyurea outer layer from inside to outside in sequence.

2. A fire retardant tarpaulin according to claim 1, wherein: the preparation method of the double-layer microcapsule phase change material comprises the following steps:

preparing a polyethylene glycol-graphene oxide core-shell material: carrying out ultrasonic dispersion on graphene oxide in a solution to form a dispersion liquid, putting polyethylene glycol into the dispersion liquid, wherein the weight ratio of the graphene oxide to the polyethylene glycol is 1 (0.8-0.9), heating to 80-90 ℃, carrying out heat preservation dispersion for 3-4 h, and then drying to obtain a polyethylene glycol-graphene oxide core-shell material;

preparing a double-layer microcapsule phase change material: dissolving polyvinyl alcohol in water, and adding a polyethylene glycol-graphene oxide core-shell material and n-octanol to prepare a dispersed phase; dissolving diisocyanate in toluene to prepare a diisocyanate toluene solution; wherein the weight ratio of the graphene oxide to the polyvinyl alcohol to the diisocyanate is 1 (1-2) to 1.5-2; and (3) putting the dispersed phase into a toluene diisocyanate solution, heating to 80-90 ℃, adding diethylenetriamine and di-n-butyltin dilaurate, keeping the temperature, stirring and dispersing for 3-4 h, washing and filtering with acetone, washing with water, filtering, and drying to obtain the double-layer microcapsule phase change material.

3. A fire retardant tarpaulin according to claim 2, wherein: the weight ratio of the graphene oxide to the polyethylene glycol is 1: 0.88.

4. A fire retardant tarpaulin according to claim 2, wherein: the weight ratio of the graphene oxide to the polyvinyl alcohol to the diisocyanate is 1:2: 2.

5. A fire retardant tarpaulin according to claim 2, wherein: the polymerization degree of the polyethylene glycol is 2000-6000.

6. A fire retardant tarpaulin according to claim 1, wherein: the weight ratio of the polyurethane finishing agent to the double-layer microcapsule phase change material is 1.8: 1.

7. A fire retardant tarpaulin according to claim 1, wherein: the dispersant is an organic silicon dispersant.

8. A fire retardant tarpaulin according to claim 1, wherein: the raw materials also comprise boric acid powder, and the weight part of the boric acid powder is 2.5-4.5.

9. A method for manufacturing a flame retardant tarpaulin of any of claims 1 to 8, wherein: the method comprises the following steps:

after sequentially desizing, refining, pre-setting, alkali reducing, dyeing, finishing and reducing and cleaning the oxford polyester filament fabric, drying to obtain polyester filament yarns subjected to reducing and cleaning treatment for later use;

weighing the flame retardant raw materials according to the formula ratio, and uniformly stirring to obtain the flame retardant for later use;

soaking the polyester filament oxford fabric subjected to reduction cleaning treatment in a flame retardant according to the bath ratio of 1 (10-20), rolling after soaking, controlling the rolling residual rate to be 60% -80%, then putting the polyester filament oxford fabric into an oven, heating to 130-150 ℃, and carrying out heat preservation reaction for 10-30 min to obtain the flame-retardant tarpaulin.

Technical Field

The invention relates to the technical field of textile manufacturing, in particular to flame-retardant tarpaulin and a preparation process thereof.

Background

The polyester fiber is a common raw material for weaving the tarpaulin, and the tarpaulin made of the polyester fiber has the advantages of good elasticity, strong chemical resistance, good waterproofness and the like in the using process, and can be used for manufacturing the tarpaulin used outdoors. However, when the tarpaulin is used outdoors, especially as a camping tent, the tarpaulin cannot be close to a fire pile, and the application range is limited.

The Limit Oxygen Index (LOI) of the polyester fiber is only 21-22 percent, and the polyester fiber belongs to combustible fiber. The terylene tarpaulin is easy to be burnt out of holes when meeting sparks, and can generate serious melting and dripping phenomena. At present, the conventional treatment method for improving the flame retardant property of the polyester tarpaulin comprises the following steps: and (4) carrying out after-treatment on the polyester fibers by using a flame retardant. The fire retardant used in China is generally tetrakis (hydroxymethyl) phosphonium chloride polycondensate, organic phosphate and the like, so that the polyester tarpaulin achieves a certain effect of insoluble drops.

In the process of implementing the present application, the inventors found that at least the following problems exist in the related art: the flame retardant in the flame-retardant after-finishing method is larger in dosage, but the effect of improving the flame retardant performance of the polyester tarpaulin is not obvious, the LOI of the polyester tarpaulin is improved to 24.0% from 21.2%, and the flame retardant effect is reduced along with the prolonging of the service time. Therefore, the development of a polyester tarpaulin with high flame retardant property becomes a research hotspot in the field.

Disclosure of Invention

In order to improve the flame retardant property of the tarpaulin, the application provides the flame retardant tarpaulin and the preparation process thereof.

In a first aspect, the present application provides a flame retardant tarpaulin, which adopts the following technical scheme:

the utility model provides a fire-retardant tarpaulin, includes dacron filament oxford and adheres to the outer fire-retardant layer of dacron filament oxford, fire-retardant layer comprises the raw materials including following parts by weight: 70-90 parts of polyurethane finishing agent, 44-66 parts of solvent, 25-45 parts of double-layer microcapsule phase change material, 10-22 parts of ammonium polyphosphate and 3-7 parts of dispersing agent; the double-layer microcapsule phase change material is composed of a polyethylene glycol core material, a graphene oxide secondary outer layer and a polyurea outer layer from inside to outside in sequence.

By adopting the technical scheme, the double-layer microcapsule phase change material and the ammonium polyphosphate are fully dispersed in a polyurethane finishing agent-solvent system under the action of the dispersing agent, and the polyurethane finishing agent is cured into a film to form a flame-retardant layer; the double-layer microcapsule phase change material and the ammonium polyphosphate in the flame-retardant layer are firmly attached to the surface layer of the polyester filament oxford fabric, so that better flame-retardant and waterproof effects are achieved, and meanwhile, the strength of the polyester tarpaulin is not influenced;

the principle is as follows: firstly, the polyurea material at the outermost layer of the double-layer microcapsule phase-change material can play a role in promoting appearance, and the compatibility between the outer polyurea layer and the polyurethane finishing agent and between the polyurea material and the ammonium polyphosphate is good, so that the dispersion of the double-layer microcapsule phase-change material in the curing agent is facilitated, the double-layer microcapsule phase-change material in the flame-retardant layer obtained after the curing agent is finished and cured is uniformly distributed, and the polyester tarpaulin can be fully protected; the graphene oxide on the second outer layer is a good heat conductor, heat absorbed by the polyurea material on the outermost layer can be quickly conducted to the polyethylene glycol core material, the polyethylene glycol core material absorbs heat through phase change, and heat transferred to the polyester tarpaulin is reduced, so that the possibility of burning of the polyester tarpaulin is reduced;

polyethylene glycol in the double-layer microcapsule phase change material can be stored in graphene oxide for a long time, and the bonding strength between the flame-retardant layer and the polyester tarpaulin is high, so that the flame-retardant effect of the flame-retardant layer is long and efficient;

secondly, ammonium polyphosphate is rapidly decomposed to generate water, ammonia, polyphosphoric acid and other substances with good thermal stability when being heated, and the water and the ammonia isolate oxygen to prevent the dacron tarpaulin from burning; the polyphosphoric acid can rapidly expand to absorb heat, and forms a compact heat insulation layer together with the double-layer microcapsule phase change material, the heat insulation layer isolates oxygen to prevent the burning of the polyester tarpaulin, and the compact heat insulation layer limits the movement of molecules of the polyester tarpaulin, so that the anti-dripping performance of the molecules of the polyester tarpaulin is improved;

moreover, compared with the traditional flame-retardant layer, the flame-retardant layer formed by the polyurethane finishing agent has good elasticity and waterproof performance; the flame retardant used in the application is efficient, so that a good flame retardant effect can be achieved with a small coating amount, and the flame retardant hardly affects the strength of the polyester tarpaulin;

therefore, the flame retardant prepared by the method can enable the limit oxygen index of the polyester tarpaulin to reach 30.4%, the vertical combustion level to reach V-0, and the polyester tarpaulin has good flame retardant property.

Preferably, the preparation method of the double-layer microcapsule phase change material comprises the following steps:

preparing a polyethylene glycol-graphene oxide core-shell material: carrying out ultrasonic dispersion on graphene oxide in a solution to form a dispersion liquid, putting polyethylene glycol into the dispersion liquid, wherein the weight ratio of the graphene oxide to the polyethylene glycol is 1 (0.8-0.9), heating to 80-90 ℃, carrying out heat preservation dispersion for 3-4 h, and then drying to obtain a polyethylene glycol-graphene oxide core-shell material; preparing a double-layer microcapsule phase change material: dissolving polyvinyl alcohol in water, and adding a polyethylene glycol-graphene oxide core-shell material and n-octanol to prepare a dispersed phase; dissolving diisocyanate in toluene to prepare a diisocyanate toluene solution; wherein the weight ratio of the graphene oxide to the polyvinyl alcohol to the diisocyanate is 1 (1-2) to 1.5-2; and (3) putting the dispersed phase into a toluene diisocyanate solution, heating to 80-90 ℃, adding diethylenetriamine and di-n-butyltin dilaurate, keeping the temperature, stirring and dispersing for 3-4 h, washing and filtering with acetone, washing with water, filtering, and drying to obtain the double-layer microcapsule phase change material.

By adopting the technical scheme, the preparation process of the double-layer microcapsule phase-change material is simple, the embedding rate is higher under the process parameters, and the prepared double-layer microcapsule phase-change material has moderate particle size, is micron-sized solid powder and does not influence the finishing hand feeling of the polyester tarpaulin.

Preferably, the weight ratio of the graphene oxide to the polyethylene glycol is 1: 0.88.

Through adopting above-mentioned technical scheme, under the prerequisite that does not influence the embedding effect, when this weight ratio, oxidation graphite alkene can be embedded the polyethylene glycol as far as, is favorable to fire-retardant layer fully to absorb heat, further reduces the heat of transmitting on the dacron filament oxford.

Preferably, the weight ratio of the graphene oxide to the polyvinyl alcohol to the diisocyanate is 1:2: 2.

Through adopting above-mentioned technical scheme, polyvinyl alcohol and diisocyanate and graphene oxide are under this weight ratio, and thickness is moderate, can make graphene oxide have part to expose outmost, can accelerate thermal absorption, further improve the fire behaviour of fire-retardant tarpaulin.

Preferably, the polymerization degree of the polyethylene glycol is 2000-6000.

By adopting the technical scheme, the polymerization degree of the polyethylene glycol is in the range, the phase-change temperature of the polyethylene glycol is 50-64 ℃, and the absorption effect on heat is good, so that the flame retardant property of the polyester tarpaulin is improved.

Preferably, the weight ratio of the polyurethane finishing agent to the double-layer microcapsule phase change material is 1.8: 1.

By adopting the technical scheme, under the weight ratio, the viscosity of the flame retardant is moderate, the coating effect is good, and a smooth flame retardant layer can be formed on the surface of the polyester tarpaulin.

Preferably, the dispersant is an organosilicon dispersant.

By adopting the technical scheme, the organic silicon dispersing agent can reduce the surface tension of the flame-retardant layer and obviously improve the waterproof performance of the flame-retardant layer.

Preferably, the raw material further comprises boric acid powder, and the weight part of the boric acid powder is 2.5-4.5.

Through adopting above-mentioned technical scheme, boric acid is Lewis acid, can catalyze the decomposition of ammonium polyphosphate, further improves the fire-retardant efficiency on fire-retardant layer, prevents to appear open fire on the dacron tarpaulin.

In a second aspect, the application provides a preparation method of a flame-retardant tarpaulin, which adopts the following technical scheme:

a preparation method of flame-retardant tarpaulin comprises the following steps:

after sequentially desizing, refining, pre-setting, alkali reducing, dyeing, finishing and reducing and cleaning the oxford polyester filament fabric, drying to obtain polyester filament yarns subjected to reducing and cleaning treatment for later use;

weighing the flame retardant raw materials according to the formula ratio, and uniformly stirring to obtain the flame retardant for later use;

soaking the polyester filament oxford fabric subjected to reduction cleaning treatment in a flame retardant according to the bath ratio of 1 (10-20), rolling after soaking, controlling the rolling residual rate to be 60% -80%, then putting the polyester filament oxford fabric into an oven, heating to 130-150 ℃, and carrying out heat preservation reaction for 10-30 min to obtain the flame-retardant tarpaulin.

Through adopting above-mentioned technical scheme, can make high-efficient and fire-retardant tarpaulin that fire-retardant effect is lasting.

In summary, the present application has the following beneficial effects:

1. in the application, a double-layer microcapsule phase change material and ammonium polyphosphate are added into a polyurethane finishing agent-solvent system under the action of a dispersing agent, and the polyurethane finishing agent is cured into a film to form a flame-retardant layer; the double-layer microcapsule phase change material and the ammonium polyphosphate in the flame-retardant layer are firmly attached to the surface layer of the polyester filament oxford fabric, so that better flame-retardant and waterproof effects are achieved, and meanwhile, the strength of the polyester tarpaulin is not influenced;

2. the organic silicon dispersing agent is used, so that the surface tension of the flame-retardant layer is reduced, and the waterproof performance of the flame-retardant tarpaulin is obviously improved;

3. boric acid powder is further added in the flame-retardant layer, and the boric acid can further improve the flame-retardant efficiency of the flame-retardant layer.

Detailed Description

Unless otherwise specified, the sources of the raw materials for the following examples and comparative examples are shown in the following table:

table 1 source of feedstock:

preparation example of double-layer microcapsule phase-change Material

Preparation example 1

A double-layer microcapsule phase change material is prepared according to the following process steps:

preparing a polyethylene glycol-graphene oxide core-shell material:

weighing 2kg of graphene oxide, and ultrasonically dispersing the graphene oxide in 400L of tetrahydrofuran, wherein the ultrasonic dispersion frequency is 20kHz, and the ultrasonic time is 30min to obtain a dispersion liquid; weighing 1.6kg of polyethylene glycol (with the polymerization degree of 500), putting the polyethylene glycol into the dispersion liquid, heating to 80 ℃, stirring at the stirring speed of 1500rpm, preserving heat, stirring for 4 hours, transferring to an oven at 80 ℃, and completely drying to obtain a polyethylene glycol-graphene oxide core-shell material;

preparing a double-layer microcapsule phase change material:

adding 40L of water and 2kg of polyvinyl alcohol into a dispersion tank, heating to 90 ℃, stirring at a stirring speed of 500rpm, keeping the temperature, stirring for 30min, cooling to 20 ℃, then adding a polyethylene glycol-graphene oxide core-shell material and 1kg of n-octanol, and continuously stirring at a rotating speed of 1300rpm for 5min to obtain a dispersion phase;

weighing 3kg of diisocyanate and 10kg of toluene, and continuously stirring at the rotating speed of 800rpm for 1h at the temperature of 20 ℃; then adding the dispersed phase into a toluene diisocyanate solution, heating to 80 ℃, adding 0.5kg of diethylenetriamine and 0.5kg of di-n-butyltin dilaurate at the temperature, and continuously stirring at the rotating speed of 1000rpm for 4 hours; and after stirring, washing and filtering with acetone, washing with distilled water, carrying out vacuum filtration, repeating the steps twice, and drying the obtained solid in an oven at 60 ℃ for 24 hours to obtain the double-layer microcapsule phase change material.

Preparation examples 2 to 6

The difference between the double-layer microcapsule phase change material and the preparation example 1 is that the weight ratios of graphene oxide and polyethylene glycol and the weight ratios of polyethylene glycol, polyvinyl alcohol and diisocyanate in the preparation process are different, and the specific gravity is shown in the following table 2.

TABLE 2 proportion of double-layer microcapsule phase-change material raw materials

Preparation example	Graphene oxide/kg	Polyethylene glycol/kg	Polyvinyl alcohol/kg	Diisocyanate per kg
					Preparation example 1	2	1.6	2	3
Preparation example 2	2	1.8	2	3
					Preparation example 3	2	1.76	2	3
Preparation example 4	2	1.76	3	3
					Preparation example 5	2	1.76	4	3
Preparation example 6	2	1.76	4	4

Preparation examples 7 to 9

A double-layer microcapsule phase change material is different from the preparation example 6 in that the polymerization degree of polyethylene glycol is different:

the polymerization degree of the polyethylene glycol used in preparation example 7 was 20000;

the polymerization degree of the polyethylene glycol used in preparation example 8 was 2000;

the polyethylene glycol used in preparation example 9 had a polymerization degree of 6000.

Preparation example 10

A double-layer microcapsule phase change material is prepared according to the following process steps:

preparing a polyethylene glycol-graphene oxide core-shell material:

weighing 2kg of graphene oxide, and ultrasonically dispersing the graphene oxide in 400L of tetrahydrofuran, wherein the ultrasonic dispersion frequency is 20kHz, and the ultrasonic time is 30min to obtain a dispersion liquid; weighing 1.6kg of polyethylene glycol (with the polymerization degree of 500), putting the polyethylene glycol into the dispersion liquid, heating to 90 ℃, stirring at the stirring speed of 1500rpm, preserving heat, stirring for 3 hours, transferring to an oven at 80 ℃, and completely drying to obtain a polyethylene glycol-graphene oxide core-shell material;

preparing a double-layer microcapsule phase change material:

adding 40L of water and 2kg of polyvinyl alcohol into a dispersion tank, heating to 90 ℃, stirring at a stirring speed of 500rpm, keeping the temperature, stirring for 30min, cooling to 20 ℃, then adding a polyethylene glycol-graphene oxide core-shell material and 1kg of n-octanol, and continuously stirring at a rotating speed of 1300rpm for 5min to obtain a dispersion phase;

weighing 3kg of diisocyanate and 10kg of toluene, and continuously stirring at the rotating speed of 800rpm for 1h at the temperature of 20 ℃; then adding the dispersed phase into a toluene diisocyanate solution, heating to 90 ℃, adding 0.5kg of diethylenetriamine and 0.5kg of di-n-butyltin dilaurate at the temperature, and continuously stirring at the rotating speed of 1000rpm for 3 hours; and after stirring, washing and filtering with acetone, washing with distilled water, carrying out vacuum filtration, repeating the steps twice, and drying the obtained solid in an oven at 60 ℃ for 24 hours to obtain the double-layer microcapsule phase change material.

Preparation of comparative example

Preparation of comparative example 1

A microcapsule material is prepared according to the following process steps:

preparing a polyethylene glycol-graphene oxide core-shell material: weighing 2kg of graphene oxide, and ultrasonically dispersing the graphene oxide in 400L of tetrahydrofuran, wherein the ultrasonic dispersion frequency is 20kHz, and the ultrasonic time is 30min to obtain a dispersion liquid; weighing 1.6kg of polyethylene glycol (with a polymerization degree of 80%), adding the polyethylene glycol into the dispersion liquid, heating to 80 ℃, stirring at a stirring speed of 1500rpm, keeping the temperature, stirring for 4 hours, and transferring to an oven at 80 ℃ for complete drying to obtain the polyethylene glycol-graphene oxide microcapsule material.

Preparation of comparative example 2

A microcapsule material is prepared according to the following process steps:

adding 40L of water and 2kg of polyvinyl alcohol into a dispersion tank, heating to 90 ℃, stirring at a stirring speed of 500rpm, keeping the temperature, stirring for 30min, cooling to 20 ℃, then adding 2kg of graphene oxide and 1kg of n-octanol, and continuously stirring at a rotating speed of 1300rpm for 5min to obtain a dispersion phase;

weighing 3kg of diisocyanate and 10kg of toluene, and continuously stirring at the rotating speed of 800rpm for 1h at the temperature of 20 ℃; then adding the dispersed phase into a toluene diisocyanate solution, heating to 90 ℃, adding 0.5kg of diethylenetriamine and 0.5kg of di-n-butyltin dilaurate at the temperature, and continuously stirring at the rotating speed of 1000rpm for 3 hours; and after stirring, washing and filtering with acetone, washing with distilled water, carrying out vacuum filtration, repeating the steps twice, and drying the obtained solid in an oven at 60 ℃ for 24 hours to obtain the microcapsule material.

Examples

Example 1

The flame-retardant tarpaulin comprises the following raw materials in parts by weight:

70kg of polyurethane finishing agent, 44kg of ethanol, 25kg of double-layer microcapsule phase change material prepared in preparation example 1, 10kg of ammonium polyphosphate and 3kg of polyacrylic acid anionic dispersant;

the preparation method of the flame-retardant tarpaulin comprises the following steps:

taking the polyester filament oxford fabric, wherein the specification is as follows: the weight is 180 g/square meter, the breadth is 150cm, and the length is 150 m; after sequentially desizing, refining, pre-setting, alkali reducing, dyeing, finishing and reducing and cleaning the oxford polyester filament fabric, drying to obtain polyester filament yarns subjected to reducing and cleaning treatment for later use;

weighing the flame retardant raw materials according to the formula, putting the polyurethane finishing agent into ethanol, adding the double-layer microcapsule phase change material, ammonium polyphosphate and polyacrylic acid anion dispersing agent, and stirring at the stirring speed of 1200rpm for 20min to obtain the flame retardant for later use;

soaking the polyester filament oxford fabric subjected to reduction cleaning in a flame retardant according to a bath ratio of 1:10 for 10min, rolling, controlling the rolling residual rate to be 60%, then feeding the polyester filament oxford fabric into an oven, heating to 130 ℃, and carrying out heat preservation reaction for 10min to obtain the flame-retardant tarpaulin.

Examples 2 to 10

The flame-retardant tarpaulin is different from the tarpaulin in example 1 in that the source of the double-layer microcapsule phase change material is different, and the specific source is shown in the following table 3.

TABLE 3 sources of double-layer microcapsule phase change materials

Examples 11 to 15

A flame retardant tarpaulin, which is different from example 9 in that the composition of the flame retardant is different, and the specific composition is shown in table 4 below.

TABLE 4 specific composition of flame retardants

Example 16

A flame-retardant tarpaulin is different from the tarpaulin of example 15 in that a mass of 7kg of an organic silicon dispersant is used instead of a polyacrylic anionic dispersant.

Example 17

The flame-retardant tarpaulin is different from the flame-retardant tarpaulin in the embodiment 1 in that the flame-retardant tarpaulin is prepared by the following process parameters in the embodiment 17:

the bath ratio of the oxford fabric of the polyester filament subjected to reduction cleaning to the flame retardant is 1:20, the rolling allowance is 80%, the drying temperature is 150 ℃, and the heat preservation reaction is carried out for 30 min.

Comparative example

Comparative examples 1 to 2

The flame-retardant tarpaulin is different from the tarpaulin in the embodiment 1 in that microcapsule materials with equal mass are used for replacing double-layer microcapsule phase change materials;

wherein the double-layer microcapsule phase change material prepared in preparation example 1 was replaced with the microcapsule material prepared in preparation example 1 in equal mass in comparative example 1;

in comparative example 2, the double-layer microcapsule phase change material prepared in preparation example 2 was replaced with the microcapsule material prepared in preparation example 2 in equal mass;

comparative example 3

A flame retardant tarpaulin, which is different from example 1 in the composition of the flame retardant, the specific composition is shown in table 5 below.

TABLE 5 specific composition of flame retardants

Performance test

Detection method

The flame retardant tarpaulin manufactured in examples 1 to 17 and comparative examples 1 to 3 was cut into a test sample having a size of 10cm × 10cm, and the following test was performed:

A. flame retardant property: the LOI of the test sample was tested according to EN 4589-2; testing the vertical burning rating of the test specimen according to the UL94 standard; observing whether smoke emerges;

performing LOI detection and vertical combustion grade detection on the test sample after 50 times of combustion;

B. waterproof performance: testing the hydrostatic pressure of the test sample according to HG/T2582;

C. mechanical properties: the tear strength of the test specimens was tested according to ISO 13937-2-2000.

Detecting data

TABLE 6 flame retardant tarpaulin Performance test results

Note that: and the "/" indicates that the flame-retardant tarpaulin is burnt out and cannot be detected.

The vertical burning ratings in examples 1-17 were all V-0 and no smoke was generated; the vertical burning rank was V-0 even after 50 burning tests, and no smoke was generated.

By combining the example 1 and the comparative examples 1-2 and combining the table 6, it can be seen that the microcapsule material used in the comparative example 1 has the LOI of only 23.4% after the flame retardant layer is formed by adding the flame retardant into the microcapsule material with the polyethylene glycol as the core material and the graphene oxide as the wall material, but the flame retardant strength cannot be detected after the flame retardant layer is burnt for 50 times;

the microcapsule material used in comparative example 2 uses graphene oxide as a core material, polyurea material as a wall material, and a flame retardant is added, so that after a flame-retardant layer is formed, the LOI of the flame-retardant tarpaulin is only 23.2%, and after 50 times of combustion, the flame-retardant performance of the tarpaulin is almost invalid, the LOI is reduced to 19.2%, and the flame-retardant performance is not durable;

in the embodiment 1, the double-layer microcapsule phase change material is added into the flame retardant, so that the LOI of the prepared flame-retardant tarpaulin can be increased to 30.4% from 22%, the vertical combustion grade reaches V-0, the tarpaulin is insoluble and non-dripping, no smoke is generated, and the flame retardant property of the tarpaulin is obviously improved; after 50 times of combustion, the LOI can still reach 28.4%, which shows that the limit oxygen index can be obviously improved and the flame retardant duration of the flame retardant tarpaulin can be good by using the double-layer microcapsule phase change material.

In addition, the hydrostatic pressure of the embodiment 1 can reach 40cm of water column, and the waterproof effect is good; the tearing strength can reach 31.04N/5cm, and the strength of the flame-retardant tarpaulin is high.

It can be seen by combining example 1 and comparative example 3 and table 6 that, in comparative example 3, the double-layer microcapsule phase change material is used to replace ammonium polyphosphate, the LOI of the flame-retardant tarpaulin is only 27.8%, but the flame-retardant tarpaulin is burnt after being burnt for 50 times and the flame-retardant strength of the flame-retardant tarpaulin cannot be detected, which indicates that the limit oxygen index of the polyester tarpaulin can be significantly improved and the flame-retardant durability of the polyester tarpaulin can be significantly improved by using the double-layer microcapsule phase change material and the ammonium polyphosphate together.

It can be seen from the combination of examples 1 to 10 and table 6 that the doping amount of each material in the double-layer phase-change microcapsule material is controlled, so that the graphene oxide in the double-layer phase-change microcapsule material can be coated with polyethylene glycol as much as possible, meanwhile, the polyurea material partially coats the graphene oxide, the graphene oxide can be partially leaked, and the flame-retardant tarpaulin can rapidly absorb heat and decompose when contacting flame at high temperature, thereby achieving the effect of high-efficiency flame retardance.

It can be seen from the combination of examples 13-15 and table 6 that the incorporation of boric acid powder into the flame retardant can further improve the limiting oxygen index of the flame retardant tarpaulin, and the flame retardant property is durable, and the principle is as follows: boric acid powder can make fire-retardant tarpaulin form compact insulating layer fast when contacting the burning source, and this fire-retardant layer adhesion strength is high, and thermal stability is good, reduces the possibility of inside dacron tarpaulin burning.

As can be seen by combining examples 15-16 with table 6, the use of the silicone dispersant can increase the limiting oxygen index and hydrostatic pressure of the flame retardant tarpaulin, possibly due to: the organic silicon dispersing agent has a better dispersing effect, and the possibility of agglomeration of the double-layer microcapsule phase change material, ammonium polyphosphate and boric acid is reduced, so that the flame-retardant layer can fully protect the polyester tarpaulin.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.