Flame-retardant PA (polyamide) foaming material as well as preparation method and application thereof

Abstract

The invention provides a flame-retardant PA (polyamide) foam material as well as a preparation method and application thereof, and relates to the technical field of floor materials, the flame-retardant PA foam material comprises the following raw material components: PA6 resin, a foam material, nattoblende mineral powder, aluminum nitrate and vermiculite powder, as well as optional flexibilizer, flame-retardant material, stearic acid, lubricant and white oil. The flame-retardant PA foaming material provided by the invention can bear larger pressure and impact force, the wear resistance is enhanced, the maintenance and replacement frequency is reduced, and meanwhile, the flame-retardant and fire-extinguishing effects of the flame-retardant PA foaming material are good.

Description

Technical Field

[0001] The invention relates to the technical field of floor materials, and in particular to a flame-retardant PA foam material and a preparation method and application thereof. Background Art

[0002] Traditional flooring materials, such as PVC (polyvinyl chloride) and PP (polypropylene), have been widely used in modern architecture and interior decoration. However, these materials have many shortcomings in terms of performance. PVC flooring has shown poor flame retardancy in practical applications. In addition, PVC materials have poor biodegradability and are difficult to decompose under natural conditions, which not only aggravates the problem of environmental pollution, but also is not conducive to the recycling of PVC flooring. The surface hardness of PP flooring materials is insufficient, which affects its use.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] One of the purposes of the present invention is to provide a flame retardant PA foam material to at least solve one of the technical problems existing in the prior art. The flame retardant PA foam material provided by the present invention has strong load-bearing capacity and good flame retardant performance.

[0005] A second object of the present invention is to provide a method for preparing a flame retardant PA foam material.

[0006] A third object of the present invention is to provide an application of a flame-retardant PA foam material or a method for preparing a flame-retardant PA foam material in preparing a flame-retardant PA foam board.

[0007] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0008] In a first aspect, the flame retardant PA foam material provided by the present invention comprises the following raw material components:

[0009] PA6 resin, foaming material, sodium amphibole mineral powder, aluminum nitrate and vermiculite powder, and optional toughening agent, flame retardant material, stearic acid, lubricant and white oil.

[0010] Furthermore, the flame retardant PA foam material comprises the following raw material components in parts by weight:

[0011] 100 parts of PA6 resin, 2-4 parts of foaming material, 3-5 parts of toughening agent, 10-15 parts of flame retardant material, 40-50 parts of sodium amphibole mineral powder, 2-3 parts of stearic acid, 1-2 parts of lubricant, 10-15 parts of aluminum nitrate, 15-20 parts of vermiculite powder and 8-10 parts of white oil.

[0012] Furthermore, the flame retardant PA foam material comprises the following raw material components in parts by weight:

[0013] 100 parts of PA6 resin, 3 parts of foaming material, 4 parts of toughening agent, 13 parts of flame retardant material, 45 parts of sodium amphibole mineral powder, 2.5 parts of stearic acid, 1.5 parts of lubricant, 13 parts of aluminum nitrate, 18 parts of vermiculite powder and 9 parts of white oil.

[0014] Furthermore, the foaming material includes at least one of hollow microsphere particles, sodium bicarbonate and AC foaming agent.

[0015] Furthermore, the toughening agent includes at least one of glass wool and biological fiber.

[0016] Furthermore, the flame retardant material includes at least one of volcanic ash ore powder and magnesium oxide.

[0017] Furthermore, the lubricant includes at least one of PE and paraffin.

[0018] In a second aspect, the present invention provides a method for preparing the flame-retardant PA foam material, comprising the following steps:

[0019] The flame-retardant PA foaming material is obtained by mixing the PA6 resin, foaming material, toughening agent, flame-retardant material, sodium amphibole mineral powder, stearic acid, lubricant, aluminum nitrate, vermiculite powder and white oil in a prescribed amount and then extruding the mixture.

[0020] Furthermore, the mixing temperature is 100-120°C; the mixing speed is 200-320r / min;

[0021] Preferably, before the extrusion process, the mixed raw material components are cooled to 50-60°C;

[0022] Preferably, the extrusion treatment temperature is 200-280°C.

[0023] In a third aspect, the present invention provides an application of the flame-retardant PA foam material or the preparation method in preparing a flame-retardant PA foam board.

[0024] Furthermore, the flame retardant PA foam board is prepared by the following method:

[0025] The flame-retardant PA foam material is coated with a PA color film and a PA wear-resistant layer in sequence, and then UV coating and punching treatment are performed in sequence to obtain the flame-retardant PA foam board.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The flame-retardant PA foam material provided by the present invention uses PA6 resin as a base material. Polyamide PA is a material with good wear resistance and self-lubricating properties, has a low density, meets the requirements of environmental protection and renewability, and compared with PVC and PP materials, PA materials have strong heat resistance and high strength, so that the flame-retardant PA foam material can withstand greater pressure and impact force, is not easy to be damaged, and can also resist the erosion of chemical substances and maintain stable performance; sodium amphibole mineral powder is added to the flame-retardant PA foam material provided by the present invention. In the high-temperature environment of the preparation process, the sodium amphibole mineral powder is decomposed into iron oxide, sodium oxide and silicon dioxide at high temperature. When a fire occurs, when extinguishing the fire at high temperature, the addition of fire extinguishing water causes the decomposition products of the sodium amphibole mineral powder to produce Chemical reaction: iron oxide, sodium oxide, silicon dioxide and water generate corresponding sodium hydroxide, iron hydroxide and silicic acid, among which iron hydroxide is stable and in small amount, and has certain fire resistance; sodium hydroxide can react with aluminum nitrate in the raw material component to generate heat-absorbing sodium nitrate and aluminum hydroxide with flame retardant properties; and then combined with vermiculite powder in the raw material component, the vermiculite powder expands when heated, amplifies the above reaction area, and can increase the flame retardant area; under the synergistic cooperation and joint action of sodium amphibole mineral powder, vermiculite powder and aluminum nitrate, the flame retardant effect of the flame retardant PA foam material is improved; silicic acid provides an acidic environment, and accelerates the generation of aluminum hydroxide and sodium nitrate; the foaming material in the raw material component is used to form a foam structure, reduce the density of the material, and improve the heat insulation and sound insulation properties. DETAILED DESCRIPTION

[0028] Unless otherwise defined herein, scientific and technical terms used in conjunction with the present invention shall have the meanings commonly understood by those of ordinary skill in the art. The meaning and scope of the terms should be clear, however, in the case of any potential ambiguity, the definitions provided herein take precedence over any dictionary or external definitions. In this application, unless otherwise stated, the use of "or" means "and / or". In addition, the use of the term "including" and other forms is non-limiting.

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The first aspect of the present invention provides a flame retardant PA foam material, comprising the following raw material components:

[0031] PA6 resin, foaming material, sodium amphibole mineral powder, aluminum nitrate and vermiculite powder, and optional toughening agent, flame retardant material, stearic acid, lubricant and white oil.

[0032] The flame-retardant PA foam material provided by the present invention is a high-efficiency flame-retardant PA foam board, which uses PA6 resin as a base material. Polyamide PA is a material with good wear resistance and self-lubricating properties, has a light density, meets the requirements of environmental protection and renewability, and compared with PVC and PP materials, PA materials have strong heat resistance and high strength, so that the flame-retardant PA foam material can withstand greater pressure and impact force, is not easy to be damaged, and can also resist the erosion of chemical substances to maintain stable performance; sodium amphibole mineral powder (which is rich in sodium, and a small amount of magnesium, aluminum, and calcium) is added to the flame-retardant PA foam material provided by the present invention. In the high-temperature environment of the preparation process, the sodium amphibole mineral powder is decomposed into iron oxide, sodium oxide, silicon dioxide, etc. at high temperature. When a fire occurs, when extinguishing the fire at high temperature, the addition of fire extinguishing water causes the decomposition of the sodium amphibole mineral powder. The decomposition products produce a chemical reaction, and iron oxide, sodium oxide, silicon dioxide and water generate corresponding sodium hydroxide, iron hydroxide and silicic acid, among which iron hydroxide is stable and in small amount, and has certain fire resistance. Sodium hydroxide can react with aluminum nitrate in the raw material component to produce heat-absorbing sodium nitrate and aluminum hydroxide with flame retardant properties. Vermiculite powder in the raw material component is then combined. Vermiculite powder (expansion temperature is 800-1000° C.) expands when heated, amplifies the above reaction area, and can increase the flame retardant area. Under the coordinated cooperation and joint action of sodium amphibole mineral powder, vermiculite powder and aluminum nitrate, the flame retardant effect of the flame retardant PA foaming material is improved. Silicic acid provides an acidic environment to accelerate the generation of aluminum hydroxide and sodium nitrate. The foaming material in the raw material component is used to form a foam structure, reduce the density of the material, and improve the heat insulation and sound insulation properties.

[0033] Among them, the flame-retardant PA foam material provided by the present invention improves the flame retardant effect through the synergistic effect of sodium amphibole mineral powder and aluminum nitrate. The addition of sodium amphibole mineral powder reduces the material cost and solves the problem of directly adding oxides such as sodium oxide, which causes the oxide to react with water evaporated from the material, causing the reaction to be premature, and directly reacts with the added aluminum nitrate, and the reaction is not sufficient, thereby reducing the generation of flame retardant substances and affecting the flame retardant effect.

[0034] Among them, in the flame-retardant PA foam material provided by the present invention, stearic acid is used as an external lubricant, which is mainly used for lubrication between mechanical surfaces; at the same time, flame-retardant materials are additionally added to the raw material components of the flame-retardant PA foam material, which can further improve the flame-retardant properties of the material.

[0035] In some preferred embodiments, the flame retardant PA foam material comprises the following raw material components in parts by weight:

[0036] 100 parts of PA6 resin, 2-4 parts of foaming material, 3-5 parts of toughening agent, 10-15 parts of flame retardant material, 40-50 parts of sodium amphibole mineral powder, 2-3 parts of stearic acid, 1-2 parts of lubricant, 10-15 parts of aluminum nitrate, 15-20 parts of vermiculite powder and 8-10 parts of white oil.

[0037] The flame retardant PA foam material includes 2-4 parts of foam material, for example, 2 parts, 3 parts, 4 parts, etc.;

[0038] The flame retardant PA foam material includes 3-5 parts of toughening agent, for example, 3 parts, 4 parts, 5 parts, etc.;

[0039] The flame retardant PA foam material includes 10-15 parts of flame retardant material, for example, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, etc.;

[0040] The flame retardant PA foam material includes 40-50 parts of sodium amphibole mineral powder, for example, 40 parts, 45 parts, 50 parts, etc.;

[0041] The flame retardant PA foam material includes 2-3 parts of stearic acid, for example, 2 parts, 2.5 parts, 3 parts, etc.;

[0042] The flame retardant PA foam material includes 1-2 parts of lubricant, for example, 1 part, 1.5 parts, 2 parts, etc.;

[0043] The flame retardant PA foam material includes 10-15 parts of aluminum nitrate, for example, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, etc.;

[0044] The flame retardant PA foam material includes 15-20 parts of vermiculite powder, for example, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, etc.;

[0045] The flame retardant PA foam material includes 8-10 parts of white oil, for example, 8 parts, 9 parts, 10 parts, etc.;

[0046] In some preferred embodiments, the foaming material includes at least one of hollow microsphere particles, sodium bicarbonate and AC foaming agent.

[0047] In some preferred embodiments, the toughening agent includes at least one of glass wool and biofiber.

[0048] In the present invention, the toughening agent is used to improve the toughness of the material to prevent the material from brittle fracture when subjected to impact or stress.

[0049] In some preferred embodiments, the flame retardant material includes at least one of volcanic ash ore powder and magnesium oxide.

[0050] In some preferred embodiments, the lubricant includes at least one of PE and paraffin.

[0051] In the present invention, the lubricant is mainly used for lubrication between material molecular chains; the white oil can soften the plate material and reduce the brittleness of the base material.

[0052] A second aspect of the present invention provides a method for preparing a flame retardant PA foam material, comprising the following steps:

[0053] The flame-retardant PA foaming material is obtained by mixing the PA6 resin, foaming material, toughening agent, flame-retardant material, sodium amphibole mineral powder, stearic acid, lubricant, aluminum nitrate, vermiculite powder and white oil in a prescribed amount and then extruding the mixture.

[0054] In some preferred embodiments, the mixing temperature is 100-120°C, for example, 110°C, 115°C, 120°C, etc.; the mixing speed is 200-320r / min, for example, 200r / min, 250r / min, 300r / min, 320r / min, etc.;

[0055] In the present invention, a high-speed mixer is used to heat-mix the mixture of the raw material components in order to promote more complete subsequent plasticization.

[0056] Preferably, before the extrusion process, the mixed raw material components are cooled to 50-60°C, for example, 50°C, 55°C, 60°C, etc.;

[0057] Preferably, the extrusion treatment temperature is 200-280°C, for example, 200°C, 250°C, 280°C, etc.

[0058] In the present invention, a twin-screw extruder is used for extrusion treatment, and the extrusion treatment creates a high-temperature environment for the sodium amphibole, so that it is thermally decomposed (the products are iron oxide, sodium oxide, silicon dioxide, etc.). When high-temperature fire is extinguished, the iron oxide, sodium oxide, silicon dioxide react with water to generate corresponding sodium hydroxide, iron hydroxide and silicic acid. The sodium hydroxide can react with aluminum nitrate to generate heat-absorbing sodium nitrate (sodium nitrate can absorb heat when it meets water and reduce the surface temperature) and aluminum hydroxide with good fire resistance, so that the fire extinguishing effect is enhanced and the fire extinguishing effect is achieved quickly. In addition, under the synergistic effect of the thermal expansion of the vermiculite powder, the chemical reaction area is enlarged, and the flame retardant area and the flame retardant effect are increased.

[0059] The method for preparing the flame-retardant PA foam material provided by the invention takes polyamide PA as a base material and utilizes an extruder to extrude and manufacture a plate.

[0060] A third aspect of the present invention provides a flame retardant PA foam material or use of the preparation method in preparing a flame retardant PA foam board.

[0061] In the present invention, the flame-retardant PA foam board can be a board such as a floor, which replaces the currently common method of directly adding flame-retardant substances such as magnesium hydroxide, because adding too much flame-retardant substances such as magnesium hydroxide will cause the physical properties of the board to deteriorate. The flame-retardant PA foam board provided by the present invention adds vermiculite powder that expands when exposed to high temperatures. When the fire is at high temperatures, the vermiculite powder increases the flame-retardant area, and under the synergistic cooperation and joint action of sodium amphibole mineral powder, vermiculite powder and aluminum nitrate, the flame-retardant effect of the flame-retardant PA foam material is improved.

[0062] The flame retardant PA foam board provided by the present invention has the following characteristics and advantages:

[0063] 1. The flame-retardant PA foam board has a strong bearing capacity. Compared with the traditional floor with limited bearing capacity, deformation and dents caused by heavy objects, the flame-retardant PA foam board can withstand greater pressure and impact, enhance wear resistance, and reduce maintenance and replacement frequency.

[0064] 2. The flame-retardant PA foam board has strong resistance to chemical corrosion. Traditional floors will be damaged when exposed to chemical reagents. The flame-retardant PA foam board can be laid in laboratories, chemical plants and other places.

[0065] 3. The flame-retardant PA foam board can effectively prevent moisture and water, and reduce the generation of static electricity.

[0066] 4. The flame-retardant PA foam board is made of flame-retardant materials such as volcanic ash ore powder and white oil to soften the board, reduce brittleness and improve flame retardant effect;

[0067] 5. The flame-retardant PA foam board is highly wear-resistant and tough, and at the same time, it is impact-resistant, high-temperature-resistant, flame-retardant, and has a certain degree of water absorption and moisture resistance, making up for the shortcomings of the physical properties of traditional PVC system floors.

[0068] 6. In terms of environmental protection and sustainability, the flame-retardant PA foam board can be recycled, and the discarded PA foam board can be recycled and reprocessed, reducing pollution to the environment and waste of resources. It has low VOC emissions and meets environmental protection requirements.

[0069] In some preferred embodiments, the flame retardant PA foam board is prepared by the following method:

[0070] The flame-retardant PA foam material is coated with a PA color film and a PA wear-resistant layer in sequence, and then UV coating and punching treatment are performed in sequence to obtain the flame-retardant PA foam board.

[0071] In the present invention, foaming is achieved by adjusting the formula, firstly the flame retardant PA foam material is extruded, then the PA color film and the PA wear-resistant layer are calendered, and the thickness is adjusted to obtain the foamed floor.

[0072] Furthermore, the preparation process of the flame retardant PA foam board specifically includes the following steps:

[0073] (1) Weigh the corresponding weight portions of the raw materials, put them into a high-speed mixer, mix and stir the raw materials evenly, stir at a speed of 200 to 320 r / min, and raise the temperature to 100 to 120° C.;

[0074] (2) When the set temperature of the high-speed mixer is reached, the cold mix is ​​started, and the materials in the high-speed mixer are unloaded to the cold mix. When the temperature of the materials drops to 50-60°C, the materials in the cold mix are unloaded into the storage tank for standby use;

[0075] (3) feeding the cold-mixed mixture into a twin-screw extruder for extrusion, controlling the extrusion barrel temperature at 200-280° C., and extruding through a foaming die to form a flame-retardant PA foam material;

[0076] (4) adjusting the roller speed and roller distance of the calendering roller to adjust the composite PA foaming bottom sheet to the required thickness, hot-bonding the PA color film and the PA wear-resistant layer to the prepared PA foaming substrate online, and then cutting to a fixed length to obtain a large plate.

[0077] (5) UV coating: Select appropriate UV paint to perform UV coating on the product obtained in step (4);

[0078] (6) Punching: Punching the floor into corresponding specifications;

[0079] (7) Grooving: Make grooves for floor assembly on the four sides of the floor.

[0080] (8) Packaging.

[0081] The present invention is further described below by way of examples. Unless otherwise specified, the materials in the examples are prepared according to existing methods or directly purchased from the market.

[0082] Example 1

[0083] This embodiment provides a flame retardant PA foam material, including the following raw material components in parts by weight:

[0084] 100 parts of PA6 resin, 3 parts of foaming material (2 parts of hollow microsphere particles and 1 part of AC foaming agent), 4 parts of toughening agent (2 parts of glass wool and 2 parts of bio-fiber), 13 parts of flame retardant material (7 parts of volcanic ash ore powder and 6 parts of magnesium oxide), 45 parts of sodium amphibole mineral powder, 2.5 parts of stearic acid, 1.5 parts of lubricant (1 part of PE and 0.5 part of paraffin), 13 parts of aluminum nitrate, 18 parts of vermiculite powder and 9 parts of white oil.

[0085] Example 2

[0086] This embodiment provides a flame retardant PA foam material, including the following raw material components in parts by weight:

[0087] 100 parts of PA6 resin, 2 parts of foaming material (1 part of hollow microsphere particles and 1 part of AC foaming agent), 5 parts of toughening agent (3 parts of glass wool and 2 parts of bio-fiber), 10 parts of flame retardant material (5 parts of volcanic ash ore powder and 5 parts of magnesium oxide), 50 parts of sodium amphibole mineral powder, 2 parts of stearic acid, 2 parts of lubricant (1 part of PE and 1 part of paraffin), 10 parts of aluminum nitrate, 20 parts of vermiculite powder and 8 parts of white oil.

[0088] Example 3

[0089] This embodiment provides a flame retardant PA foam material, including the following raw material components in parts by weight:

[0090] 100 parts of PA6 resin, 4 parts of foaming material (2 parts of hollow microsphere particles, 2 parts of AC foaming agent), 3 parts of toughening agent (2 parts of glass wool, 1 part of bio-fiber), 15 parts of flame retardant material (8 parts of volcanic ash ore powder, 7 parts of magnesium oxide), 40 parts of sodium amphibole mineral powder, 3 parts of stearic acid, 1 part of lubricant (0.5 parts of PE, 0.5 parts of paraffin), 15 parts of aluminum nitrate, 15 parts of vermiculite powder and 10 parts of white oil.

[0091] Example 4

[0092] This embodiment provides a flame retardant PA foam material, which is different from Embodiment 1 in that:

[0093] The sodium amphibole mineral powder is 51 parts, the aluminum nitrate is 9 parts, the vermiculite powder is 21 parts, and the other components are consistent with those in Example 1.

[0094] Example 5

[0095] This embodiment provides a flame retardant PA foam material, which is different from Embodiment 1 in that:

[0096] The sodium amphibole mineral powder is 39 parts, the aluminum nitrate is 16 parts, the vermiculite powder is 14 parts, and the other components are consistent with those in Example 1.

[0097] Embodiment 6-10

[0098] Embodiments 6-10 provide a method for preparing a flame retardant PA foam material, which is prepared using the raw material components of the flame retardant PA foam material of Embodiments 1-5, respectively, and comprises the following steps:

[0099] (1) Weigh the raw materials of the flame-retardant PA foam material of Examples 1 to 5 respectively, put them into a high-speed mixer, mix and stir the raw materials evenly, stir at a speed of 260 r / min, and raise the temperature to 110° C.;

[0100] (2) When the set temperature of the high-speed mixer is reached (110°C), the cold mixer is started, and the materials in the high-speed mixer are unloaded to the cold mixer. When the temperature of the materials drops to 55°C, the materials in the cold mixer are unloaded to the storage tank for standby use;

[0101] (3) The cold-mixed mixture is fed into a twin-screw extruder for extrusion, the extrusion barrel temperature is controlled at 240° C., and the mixture is extruded through a foaming die to form a flame-retardant PA foam material.

[0102] Embodiment 11

[0103] This embodiment provides a method for preparing a flame retardant PA foam material, which is prepared using the raw material components of the flame retardant PA foam material of embodiment 1, and includes the following steps:

[0104] (1) Weigh the raw materials of the flame-retardant PA foam material of Example 1, put them into a high-speed mixer, stir them at a speed of 200 r / min, increase the temperature to 120° C., and mix the raw materials evenly;

[0105] (2) When the set temperature of the high-speed mixer is reached, the cold mix is ​​started, and the materials in the high-speed mixer are unloaded to the cold mix. When the temperature of the materials drops to 50°C, the materials in the cold mix are unloaded into the storage tank for standby use;

[0106] (3) The cold-mixed mixture is fed into a twin-screw extruder for extrusion, the extrusion barrel temperature is controlled at 280° C., and the mixture is extruded through a foaming die to form a flame-retardant PA foam material.

[0107] Example 12

[0108] This embodiment provides a method for preparing a flame retardant PA foam material, which is prepared using the raw material components of the flame retardant PA foam material of embodiment 1, and includes the following steps:

[0109] (1) Weigh the raw materials of the flame-retardant PA foam material of Example 1, put them into a high-speed mixer, stir them at a speed of 320 r / min, raise the temperature to 100° C., and mix the raw materials evenly;

[0110] (2) When the set temperature of the high-speed mixer is reached, the cold mix is ​​started, and the materials in the high-speed mixer are unloaded to the cold mix. When the temperature of the materials drops to 60°C, the materials in the cold mix are unloaded into the storage tank for standby use;

[0111] (3) The cold-mixed mixture is fed into a twin-screw extruder for extrusion, the extrusion barrel temperature is controlled at 200° C., and the mixture is extruded through a foaming die to form a flame-retardant PA foam material.

[0112] Application Examples 1-7

[0113] Application Examples 1-7 provide a method for preparing a flame-retardant PA foam board, which is prepared using the flame-retardant PA foam material prepared in Examples 6-12, respectively, and includes the following steps:

[0114] (a) The roller speed and roller distance of the calendering rollers are adjusted to adjust the flame-retardant PA foam materials prepared in Examples 6-12 to the desired thickness, and the PA color film and the PA wear-resistant layer are thermally bonded to the prepared PA foam substrate online, and then a large plate is obtained by cutting to a fixed length.

[0115] (b) UV coating: Select appropriate UV paint (specifically smoke scald resistant paint) to UV coat the product obtained in step (a);

[0116] (c) Punching: The floor is punched into corresponding specifications;

[0117] (d) Grooving: make grooves for floor assembly on the four sides of the floor.

[0118] (e) Packaging.

[0119] Comparative Example 1

[0120] This comparative example provides a flame-retardant PA foam material, which is different from Example 1 in that the components do not contain sodium amphibole mineral powder and aluminum nitrate, and the number of parts of the flame-retardant material is increased to 71 parts.

[0121] Comparative Example 2

[0122] This comparative example provides a flame retardant PA foam material, which is different from Example 1 in that the component does not contain vermiculite powder, and the number of flame retardant materials is increased to 31 parts.

[0123] Comparative Example 3

[0124] This comparative example provides a flame retardant PA foam material, which is different from Example 1 in that the components do not contain sodium amphibole mineral powder, and 45 parts of sodium oxide are added.

[0125] Comparative Example 4

[0126] This comparative example provides a flame retardant PA foam material, which is different from Example 1 in that the PA6 resin is replaced by PVC material.

[0127] Comparative Example 5

[0128] This comparative example provides a flame retardant PA foam material, which is different from Example 1 in that the PA6 resin is replaced by PP material.

[0129] Comparative Examples 6-10

[0130] This comparative example provides a method for preparing a flame-retardant PA foam material, which is prepared using the raw material components of the flame-retardant PA foam materials of comparative examples 1-6 respectively, and the preparation method is consistent with that of Example 10.

[0131] Comparative Application Examples 1-5

[0132] Comparative Application Examples 1-5 provide a method for preparing a flame-retardant PA foam board, which is prepared using the flame-retardant PA foam materials prepared in Comparative Examples 6-10, respectively. The preparation method is consistent with that of Application Example 1.

[0133] Test Case

[0134] Test samples: the flame-retardant PA foam board prepared in Application Examples 1-7 and the flame-retardant PA foam board prepared in Comparative Application Examples 1-5.

[0135] Test method:

[0136] Flame retardant performance test: The PA foaming strips were tested vertically using a CZF II vertical combustion instrument. The strip size was 125.0mm×13.0mm×3.0mm, and the test standard was GB / T2408-2008. The samples were graded according to their burning time and the ignition of absorbent cotton, which were V 0, V 1, V 2, and NR.

[0137] Neutral salt spray test: dissolve chemically pure sodium chloride in distilled water to prepare a 5% ± 0.1% salt solution with a pH value between 6.5 and 7.2. The test chamber atomizes the salt solution. The sample is at an angle of 15-30° to the vertical plane. The sample is continuously exposed to the salt spray for a test period of 168 hours. After the test, it is naturally dried indoors for 30 minutes, and then the residual salt spray is gently washed off with clean water, and the appearance of the sample is observed.

[0138] Hardness test: Use LX-D hardness tester range (70-90) to test, and cut the plate into test samples for testing.

[0139] The test results are shown in Table 1.

[0140] Table 1

[0141]

[0142]

[0143] It can be seen from the data in Table 1 that, by comparing Application Examples 1-7 with Comparative Application Examples 1-5, it can be found that: the PA foamed floors prepared in Application Examples 1-7 all have a certain flame retardancy, but Application Example 1 has the best flame retardancy and stronger corrosion resistance, and the products of Application Examples 1-5 will have smaller droplets generated, indicating that the flame retardancy is poorer; while in the comparative application examples, the flame retardancy is greatly reduced by directly adding sodium oxide or replacing PA, which shows that in the combination of PA resin and flame retardant materials such as nanofoil in the present application, the flame retardant material itself does not need to be added too much, and nanofoil and vermiculite play a key role in the chemical reaction to improve the flame retardancy; in the salt spray test and surface hardness, the addition of PA resin can improve the chemical corrosion resistance and surface hardness of the floor, and the formula effects of PVC and PP in Comparative Application Examples 4 and 5 are poorer; in the present invention, the filling of nanofoil not only reduces the cost, but also reduces the amount of direct flame retardant, and the purpose of high-efficiency flame retardancy is achieved while reducing the cost.

[0144] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flame retardant PA foam material, characterized in that: The raw material components include: PA6 resin, foaming material, sodium amphibole mineral powder, aluminum nitrate and vermiculite powder, and optional toughening agent, flame retardant material, stearic acid, lubricant and white oil.

2. The flame retardant PA foam material according to claim 1, characterized in that: The invention comprises the following raw material components by weight: 100 parts of PA6 resin, 2-4 parts of foaming material, 3-5 parts of toughening agent, 10-15 parts of flame retardant material, 40-50 parts of sodium amphibole mineral powder, 2-3 parts of stearic acid, 1-2 parts of lubricant, 10-15 parts of aluminum nitrate, 15-20 parts of vermiculite powder and 8-10 parts of white oil.

3. The flame retardant PA foam material according to claim 2, characterized in that: The flame retardant PA foam material comprises the following raw material components in parts by weight: 100 parts of PA6 resin, 3 parts of foaming material, 4 parts of toughening agent, 13 parts of flame retardant material, 45 parts of sodium amphibole mineral powder, 2.5 parts of stearic acid, 1.5 parts of lubricant, 13 parts of aluminum nitrate, 18 parts of vermiculite powder and 9 parts of white oil.

4. The flame retardant PA foam material according to claim 1, characterized in that: The foaming material comprises at least one of hollow microsphere particles, sodium bicarbonate and AC foaming agent; The toughening agent includes at least one of glass wool and biological fiber.

5. The flame retardant PA foam material according to claim 1, characterized in that: The flame retardant material includes at least one of volcanic ash ore powder and magnesium oxide.

6. The flame retardant PA foam material according to claim 1, characterized in that: The lubricant includes at least one of PE and paraffin.

7. The method for preparing a flame retardant PA foam material according to any one of claims 1 to 6, characterized in that: The following steps are involved: The flame-retardant PA foaming material is obtained by mixing the PA6 resin, foaming material, toughening agent, flame-retardant material, sodium amphibole mineral powder, stearic acid, lubricant, aluminum nitrate, vermiculite powder and white oil in a prescribed amount and then extruding the mixture.

8. The method for preparing the flame-retardant PA foam material according to claim 7, characterized in that: The mixing temperature is 100-120°C; the mixing speed is 200-320r / min; Preferably, before the extrusion process, the mixed raw material components are cooled to 50-60°C; Preferably, the extrusion treatment temperature is 200-280°C.

9. Use of the flame-retardant PA foam material according to any one of claims 1 to 6 or the preparation method according to claim 7 or 8 in preparing a flame-retardant PA foam board.

10. The use according to claim 9, characterized in that: The flame retardant PA foam board is prepared by the following method: The flame-retardant PA foam material is coated with a PA color film and a PA wear-resistant layer in sequence, and then UV coating and punching are performed in sequence to obtain the flame-retardant PA foam board.

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