Flame-retardant EPE pearl insulation pipe cotton and its preparation method and application

Abstract

The present invention discloses a flame retardant EPE pearl insulation tube cotton and a preparation method and application thereof, and relates to the technical field of packaging insulation materials. A flame retardant EPE pearl insulation tube cotton comprises the following components in weight percentage: 65-80% low-density polyethylene; 10-25% polypiperazine phosphate; 5-15% amino polysilsesquioxane; 1-5% NOR flame retardant; 1-5% compatibilizer; 0.5-2% lubricant. The flame retardant EPE pearl insulation tube cotton of the present invention has a good flame retardant effect, an extremely low thermal conductivity, and also has heat preservation and fireproof properties, and can safely protect the pipe in the event of collision and fire.

Description

Technical Field

[0001] The invention relates to the technical field of packaging thermal insulation materials, and in particular to a flame-retardant EPE pearl thermal insulation tube cotton and a preparation method and application thereof. Background Art

[0002] As the cost of energy consumption increases in countries around the world, a large amount of insulation materials are used in air conditioning systems and hot water systems in buildings to increase their energy loss and ensure energy utilization. There are packaging insulation pipes made of polyethylene foam and polyurethane foam on the market, but when used inside buildings, they will produce toxic gases and thick smoke in the event of a fire, which seriously endangers health and life safety. Therefore, the flame retardant properties of packaging insulation pipes are extremely important. The existing EPE pearl insulation pipe cotton flame retardant solutions all use additive inorganic flame retardants, and more than 50% flame retardants need to be added to achieve a high level of flame retardant effect. However, as the amount of flame retardant increases, the foaming rate of the EPE pearl insulation pipe cotton will decrease, and the pipe cotton will become difficult to shape, resulting in insufficient insulation effect. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a flame retardant EPE pearl thermal insulation tube cotton and its preparation method and application. The flame retardant EPE pearl thermal insulation tube cotton of the present invention has a good flame retardant effect, an extremely low thermal conductivity, and both thermal insulation and fireproof properties.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] In a first aspect, the present invention provides a flame retardant EPE pearl insulation tube cotton, comprising the following components in percentage by weight:

[0006] Low-density polyethylene 65-80%; polypiperazine polyphosphate 10-25%; amino polysilsesquioxane 5-15%; NOR flame retardant 1-5%; compatibilizer 1-5%; lubricant 0.5-2%; the total weight percentage is 100%.

[0007] The present invention has found through research that when the EPE pearl insulation pipe cotton burns, polypiperazine phosphate will form a continuous carbon layer, and amino polysilsesquioxane will form a dense silicon oxide film layer. Under the synergistic effect of polypiperazine phosphate and amino polysilsesquioxane, the surface of the originally porous EPE pearl insulation pipe cotton will form a continuous, thick and dense carbonaceous layer; and the addition of N element is conducive to flame retardancy. The decomposition products of NOR-type flame retardants can react with the free radicals produced by combustion to reduce the combustion temperature. At the same time, the NOR-type flame retardant will decompose and release non-combustible gases, effectively protecting the substrate under the carbon layer from continuing to burn. Therefore, the present invention uses the synergistic effect of polypiperazine phosphate, amino polysilsesquioxane and NOR-type flame retardant to make the fireproof EPE pearl insulation pipe cotton have a good flame retardant effect, no dripping will be generated, and it is also conducive to improving the thermal insulation performance of the EPE pearl insulation pipe cotton.

[0008] The amino polysilsesquioxane of the present invention is a polysilsesquioxane containing an amino group, and its structural formula is (R1SiO 3 / 2 ) n , R1 is amino.

[0009] Preferably, the amino polysilsesquioxane is octaamino cage polysilsesquioxane.

[0010] Preferably, the molecular weight of the low-density polyethylene is 100,000-500,000. The molecular weight of the polyethylene of the present invention is tested by conventional gel permeation chromatography.

[0011] Preferably, the density of the low-density polyethylene is 0.910-0.920 g / cm 3 The density of the polyethylene described in the present invention is tested using standard GB / T 1033.

[0012] Preferably, the low-density polyethylene includes 582, 641 from Dow Chemical Company, or 0374, 0474, 0574 from the Middle East.

[0013] Preferably, the compatibilizer is maleic anhydride grafted polyethylene, and the grafting rate is greater than 0.9%.

[0014] The invention introduces a strong polar reactive group by adding a compatibilizer, so that the material has high polarity and reactivity, and can greatly improve the compatibility of the composite material.

[0015] Preferably, the lubricant includes at least one of zinc stearate, polyethylene wax and butyl stearate.

[0016] Preferably, the flame retardant EPE pearl insulation tube cotton includes the following components in weight percentage:

[0017] Low density polyethylene 70-80%; polypiperazine polyphosphate 10-20%; octaamino cage polysilsesquioxane 5-10%; NOR flame retardant 2-5%; compatibilizer 1-5%; lubricant 1-2%.

[0018] In a second aspect, the present invention also provides a method for preparing a flame retardant EPE pearl insulation tube cotton, comprising the following steps:

[0019] The components are uniformly mixed according to a proportion, melt-kneaded in an extruder to obtain a mixture, and then butane is injected into the mixture to mix and plasticize, and then extruded and foamed into a tube shape.

[0020] The amount of butane added in the present invention is adjusted according to the processing technology. Butane will volatilize and no residue will remain in the final product.

[0021] Preferably, the extruder is a single-screw extruder, and the screw temperature of the single-screw extruder is 160-195°C.

[0022] In a third aspect, the present invention also provides an application of a flame-retardant EPE pearl insulation pipe cotton in the packaging of pipes for air-conditioning systems and hot water systems inside buildings.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The flame retardant EPE pearl insulation pipe cotton of the present invention has a good flame retardant effect, has an extremely low thermal conductivity, and also has thermal insulation and fireproof properties. In the event of collision and fire, the pipe can be safely protected. At the same time, the flame retardant EPE pearl insulation pipe cotton has a low thermal conductivity, which can reduce the heat loss of the fluid during transportation and achieve a good thermal insulation effect. The flame retardant EPE pearl insulation pipe cotton of the present invention is light in weight, flexible and convenient to install, can absorb and overcome the energy brought by collision, and in the event of fire, there is no dripping when burning, low heat release, low smoke, and has a building fireproof effect. DETAILED DESCRIPTION

[0025] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments, but the protection scope and implementation methods of the present invention are not limited thereto.

[0026] Unless otherwise specified, the materials and reagents used in the following examples are commercially available.

[0027] Example 1

[0028] This embodiment discloses a flame retardant EPE pearl thermal insulation tube cotton, comprising the following components in weight percentage:

[0029] Low-density polyethylene 80%; polypiperazine phosphate 10%; octaamino cage polysilsesquioxane 5%; NOR flame retardant 2%; compatibilizer 2%; lubricant 1%.

[0030] Low-density polyethylene 582 (Dow Chemical Company), molecular weight range 100,000-300,000, density 0.923 g / cm 3 ; Polypiperazine phosphate FR501 (Jinan Nihuo New Materials Co., Ltd.); octaamino cage polysilsesquioxane (Xi'an Qiyue Biological); NOR type flame retardant is NOR 116 (BASF); compatibilizer is maleic anhydride grafted polyethylene, 41E556 (DuPont); lubricant is zinc stearate.

[0031] This embodiment also discloses a method for preparing a flame-retardant EPE pearl insulation tube cotton, comprising the following steps:

[0032] (1) The components were uniformly mixed according to a ratio to obtain a mixture, and then the mixture was melt-kneaded in a single-screw extruder (SJ65, Yuyao Jiangbei Jinxin Plastic Machinery Co., Ltd.) to obtain a compound;

[0033] (2) Injecting 1% by weight of butane into the mixture in a high-pressure manner to uniformly mix and plasticize the mixture, extruding and foaming at 160-195° C., and obtaining a flame-retardant EPE pearl insulation pipe cotton after cooling, pulling, winding and rolling.

[0034] Example 2

[0035] The difference from Example 1 is that the flame retardant EPE pearl insulation tube cotton includes the following components in percentage by weight:

[0036] Low-density polyethylene 75%; polypiperazine phosphate 15%; octaamino cage polysilsesquioxane 5%; NOR flame retardant 2%; compatibilizer 2%; lubricant 1%.

[0037] Example 3

[0038] The difference from Example 1 is that the flame retardant EPE pearl insulation tube cotton includes the following components in percentage by weight:

[0039] Low-density polyethylene 70%; polypiperazine phosphate 20%; octaamino cage polysilsesquioxane 5%; NOR flame retardant 2%; compatibilizer 2%; lubricant 1%.

[0040] Example 4

[0041] The difference from Example 1 is that the flame retardant EPE pearl insulation tube cotton includes the following components in percentage by weight:

[0042] Low-density polyethylene 70%; polypiperazine phosphate 15%; octaamino cage polysilsesquioxane 10%; NOR flame retardant 2%; compatibilizer 2%; lubricant 1%.

[0043] Example 5

[0044] The difference from Example 1 is that the flame retardant EPE pearl insulation tube cotton includes the following components in percentage by weight:

[0045] Low density polyethylene 70%; polypiperazine phosphate 10%; octaamino cage polysilsesquioxane 15%; NOR flame retardant 2%; compatibilizer 2%; lubricant 1%.

[0046] Example 6

[0047] The difference from Example 1 is that the flame retardant EPE pearl insulation tube cotton includes the following components in percentage by weight:

[0048] Low-density polyethylene 65%; polypiperazine polyphosphate 15%; octaamino cage polysilsesquioxane 15%; NOR flame retardant 2%; compatibilizer 2%; lubricant 1%.

[0049] Example 7

[0050] The difference from Example 1 is that the flame retardant EPE pearl insulation tube cotton includes the following components in percentage by weight:

[0051] Low-density polyethylene 67%; polypiperazine phosphate 20%; octaamino cage polysilsesquioxane 5%; NOR flame retardant 5%; compatibilizer 2%; lubricant 1%.

[0052] Comparative Example 1

[0053] The difference from Example 1 is that the flame retardant EPE pearl insulation tube cotton includes the following components in percentage by weight:

[0054] Low density polyethylene 72%; polypiperazine phosphate 15%; octaamino cage polysilsesquioxane 10%; compatibilizer 2%; lubricant 1%.

[0055] Comparative Example 2

[0056] The difference from Example 1 is that the flame retardant EPE pearl insulation tube cotton includes the following components in percentage by weight:

[0057] Low-density polyethylene 65%; polypiperazine phosphate 30%; NOR flame retardant 2%; compatibilizer 2%; lubricant 1%.

[0058] Comparative Example 3

[0059] The difference from Example 1 is that the flame retardant EPE pearl insulation tube cotton includes the following components in percentage by weight:

[0060] Low-density polyethylene 67%; octaamino cage polysilsesquioxane 25%; NOR flame retardant 5%; compatibilizer 2%; lubricant 1%.

[0061] Comparative Example 4

[0062] The difference from Example 1 is that an equal mass of linear polyethylene (10002AY of ExxonMobil) is used to replace the low-density polyethylene.

[0063] Comparative Example 5

[0064] The difference from Example 1 is that the flame retardant EPE pearl insulation tube cotton includes the following components in percentage by weight:

[0065] Low-density polyethylene 55%; polypiperazine polyphosphate 35%; octaamino cage polysilsesquioxane 5%; NOR flame retardant 2%; compatibilizer 2%; lubricant 1%.

[0066] Comparative Example 6

[0067] The difference from Example 1 is that the flame retardant EPE pearl insulation tube cotton includes the following components in percentage by weight:

[0068] Low-density polyethylene 85%; polypiperazine polyphosphate 5%; octaamino cage polysilsesquioxane 5%; NOR flame retardant 2%; compatibilizer 2%; lubricant 1%.

[0069] Comparative Example 7

[0070] The difference from Example 1 is that the flame retardant EPE pearl insulation tube cotton includes the following components in percentage by weight:

[0071] Low-density polyethylene 80%; polypiperazine phosphate 12%; octaamino cage polysilsesquioxane 3%; NOR flame retardant 2%; compatibilizer 2%; lubricant 1%.

[0072] Comparative Example 8

[0073] The difference from Example 1 is that the flame retardant EPE pearl insulation tube cotton includes the following components in percentage by weight:

[0074] Low-density polyethylene 67%; polypiperazine phosphate 10%; octaamino cage polysilsesquioxane 18%; NOR flame retardant 2%; compatibilizer 2%; lubricant 1%.

[0075] Comparative Example 9

[0076] The difference from Example 1 is that an equal mass of polyphosphate is used to replace piperazine polyphosphate.

[0077] Comparative Example 10

[0078] The difference from Example 1 is that octaphenyl polysilsesquioxane of equal mass is used to replace octaamino cage polysilsesquioxane.

[0079] Performance Testing

[0080] The flame-retardant EPE pearl insulation pipe cotton prepared above was tested for its foaming ratio, thermal conductivity and fireproof performance.

[0081] 1. Foaming ratio: The foaming ratio of EPE pearl insulation pipe cotton = volume after foaming / original volume.

[0082] 2. Thermal conductivity: Tested in accordance with GB / T 10296-2008, thermal conductivity tester ZRX-29370 (Beijing Zhongruixiang Technology Co., Ltd.).

[0083] 3. Flame retardant level: Tested in accordance with EN13501-1:2018.

[0084] B L :Flame growth rate index ≤ 270W / s; Flame lateral spread < test margin and total heat release within 600 seconds ≤ 7.5MJ; Flame vertical spread ≤ 150mm (within 60 seconds).

[0085] C L :Flame growth rate index ≤460W / s; Flame lateral spread <test margin and total heat release within 600 seconds ≤15MJ; Flame vertical spread ≤150mm (within 60 seconds).

[0086] D L :Flame growth rate index ≤ 2100W / s; Flame lateral spread < test margin and total heat release within 600 seconds ≤ 100MJ; Flame vertical spread ≤ 150mm (within 60 seconds).

[0087] E L :Vertical spread of flame ≤150mm (within 20 seconds).

[0088] s1: More stringent than s2, SMOGRA≤105m2 / s2, and TSP600s≤250m2;

[0089] s2: Total smoke production and smoke growth rate are limited, SMOGRA ≤ 580m2 / s2, and TSP600s ≤ 1600m2;

[0090] s3: No restrictions on smoke generation, neither s1 nor s2.

[0091] d0 = No burning drops or particles produced within 600 seconds according to EN 13823 test;

[0092] d1 = No burning drops or particles are produced for more than 10 seconds within 600 seconds according to EN13823 test;

[0093] d2 = does not belong to the classification of d0 and d1. If the filter paper ignites in the EN ISO 11925-2 ignition test, it is classified as d2.

[0094] The above test results are shown in Table 1.

[0095] Table 1

[0096]

[0097] According to Examples 1-3 in Table 1, as the content of low-density polyethylene increases, the foaming ratio increases and the thermal conductivity decreases, which indicates that the EPE pearl insulation tube cotton of the present invention has excellent thermal insulation performance.

[0098] According to the comparison of Comparative Examples 1-3 with Example 1, no NOR flame retardant was added in Comparative Example 1, no octaamino cage polysilsesquioxane was added in Comparative Example 2, and no polypiperazine phosphate was added in Comparative Example 3. The foaming ratios in Comparative Examples 1-3 were much lower than those in Example 1, and the thermal conductivity was much higher than that in Example 1; while in Example 1, polypiperazine phosphate, octaamino cage polysilsesquioxane, and NOR flame retardant were added at the same time, and the foaming ratio was greatly increased and the thermal conductivity was reduced. This shows that the polypiperazine phosphate, octaamino cage polysilsesquioxane, and NOR flame retardant of the present invention have a synergistic effect, which can improve the thermal insulation and fire resistance of the EPE pearl insulation pipe cotton, and the lack of any component will lead to a decrease in thermal insulation and fire resistance.

[0099] According to the comparison between Comparative Example 4 and Example 1, it can be obtained that in Comparative Example 4, linear polyethylene is used to replace low-density polyethylene, the foaming ratio drops sharply, the thermal conductivity is greatly increased, and the flame retardant level is not as good as Example 1, which shows that the present invention can only be foamed and molded by using specific polyethylene materials.

[0100] According to the comparison between Comparative Examples 5-8 and Example 1, when the content of low-density polyethylene, piperazine polyphosphate, and octaamino cage-type polysilsesquioxane is too high or too low, the thermal insulation and fire retardant properties of the EPE pearl thermal insulation pipe cotton are not as good as those of Example 1, indicating that by controlling the content of low-density polyethylene, piperazine polyphosphate, and octaamino cage-type polysilsesquioxane within the range defined by the present invention, it is beneficial to improve the thermal insulation and fire retardant properties of the EPE pearl thermal insulation pipe cotton.

[0101] According to the comparison between comparative examples 9-10 and example 1, in comparative example 9, polyphosphate ester is used instead of polypiperazine phosphate, and the fireproof performance of EPE pearl thermal insulation pipe cotton is not as good as that of example 1; in comparative example 10, octaphenyl polysilsesquioxane is used instead of octaamino cage polysilsesquioxane, and the thermal insulation performance of EPE pearl thermal insulation pipe cotton is not as good as that of example 1, indicating that only by compounding polypiperazine phosphate and octaamino cage polysilsesquioxane with NOR flame retardant can EPE pearl thermal insulation pipe cotton have excellent thermal insulation and fireproof performance.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A flame retardant EPE pearl insulation pipe cotton, characterized in that: The composition includes the following weight percentages: Low density polyethylene 65-80%; polypiperazine phosphate 10-25%; amino polysilsesquioxane 5-15%; NOR type flame retardant 1-5%; compatibilizer 1-5%; lubricant 0.5-2%.

2. The flame retardant EPE pearl insulation tube cotton according to claim 1, characterized in that: The molecular weight of the low-density polyethylene is 100,000-500,000.

3. The flame retardant EPE pearl insulation tube cotton according to claim 1, characterized in that: The density of the low-density polyethylene is 0.910-0.920 g / cm 3 .

4. The flame retardant EPE pearl insulation tube cotton according to claim 1, characterized in that: The amino polysilsesquioxane is octaamino cage-type polysilsesquioxane.

5. The flame retardant EPE pearl insulation tube cotton according to claim 1, characterized in that: The compatibilizer is maleic anhydride grafted polyethylene.

6. The flame retardant EPE pearl insulation tube cotton according to claim 1, characterized in that: The lubricant includes at least one of zinc stearate, polyethylene wax and butyl stearate.

7. The flame retardant EPE pearl insulation tube cotton according to claim 1, characterized in that: The flame retardant EPE pearl insulation pipe cotton includes the following components in percentage by weight: Low density polyethylene 70-80%; polypiperazine polyphosphate 10-20%; octaamino cage polysilsesquioxane 5-10%; NOR flame retardant 2-5%; compatibilizer 1-5%; lubricant 1-2%.

8. The method for preparing the flame-retardant EPE pearl insulation tube cotton according to any one of claims 1 to 7, characterized in that: The following steps are involved: The components are uniformly mixed according to a proportion, melt-kneaded in an extruder to obtain a mixture, and then butane is injected into the mixture to mix and plasticize, and then extruded and foamed into a tube shape.

9. The method for preparing the flame-retardant EPE pearl insulation tube cotton according to claim 8, characterized in that: The extruder is a single-screw extruder, and the screw temperature of the single-screw extruder is 160-195°C.

10. Application of the flame-retardant EPE pearl insulation pipe cotton as claimed in any one of claims 1 to 7 in the packaging of pipes for air-conditioning systems and hot water systems.

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