WO2021097661A1 - Special flame-retardant polypropylene for battery pack upper cover of new energy vehicle - Google Patents

Abstract

Special flame-retardant polypropylene for a battery pack upper cover of a new energy vehicle, comprising, in parts by mass: 100-150 parts of polypropylene resin, 30-50 parts of an intumescent flame retardant, 5-10 parts of natural zeolite, 1-3 parts of a compatibilizer, 0.1-0.5 parts of an antioxidant, 2-3 parts of a lubricant, and 1-3 parts of a flame-retardant synergist. The flame-retardant polypropylene has good flame retardancy and mechanical strength.

Description

A special flame-retardant polypropylene for the upper cover of a new energy vehicle battery pack Technical field

The invention relates to the technical field of polymer materials, in particular to a flame-retardant polypropylene special for the upper cover of a battery pack of a new energy automobile.

Background technique

Polypropylene is abbreviated as PP, which is a colorless, odorless, non-toxic, translucent solid substance. Polypropylene (PP) is a thermoplastic synthetic resin with excellent properties, and is a colorless and translucent thermoplastic lightweight general-purpose plastic. With chemical resistance, heat resistance, electrical insulation, high-strength mechanical properties and good high wear-resistant processing properties, this has made polypropylene rapidly used in machinery, automobiles, electronics, construction, textiles, packaging since its inception. , Agriculture, forestry, fishery, food industry and many other fields have been widely developed and applied. And because of its plasticity, polypropylene materials are gradually replacing wooden products, and high strength, toughness and high wear resistance have gradually replaced the mechanical functions of metals. In addition, polypropylene has good grafting and compounding functions, and has huge application space in concrete, textile, packaging, agriculture, forestry and fishery. The PP materials currently used in new energy vehicle batteries have poor flame retardancy and poor structural properties. Once the vehicle is in a slight collision, it is easy to cause accidents. Therefore, it is necessary to provide a special flame-retardant polypropylene for the upper cover of the battery pack of a new energy automobile.

Summary of the invention

In order to overcome the defects in the prior art, a special flame-retardant polypropylene for the upper cover of the battery pack of a new energy vehicle is provided.

The present invention is realized through the following schemes:

A special flame-retardant polypropylene for the upper cover of a new energy vehicle battery pack. In parts by mass, the flame-retardant polypropylene comprises 100-150 parts of polypropylene resin, 40-60 parts of intumescent flame retardant, and 5-10 parts of natural zeolite Parts, 1-3 parts of compatibilizer, 0.1-0.5 parts of antioxidant, 2-3 parts of lubricant, 1-3 parts of flame retardant synergist.

The intumescent flame retardant is prepared by a method including the following steps:

Raw material weighing step: Weigh the raw materials according to the following weight parts: 10-15 parts of pentaerythritol, 15-20 parts of phosphorus oxychloride, 20-30 parts of melamine, 20-30 parts of ethylene glycol, and 50-100 parts of ethanol;

Reaction steps: add melamine into ethylene glycol to dissolve to obtain a melamine glycol solution; stir pentaerythritol and phosphorus oxychloride uniformly, and heat the oil bath at 100-150°C to reflux for 1-3 hours to obtain a viscous intermediate ; Stir the viscous intermediate and the melamine glycol solution evenly, heat at 80-120 ℃ and reflux for 2-4 hours. After the reaction is completed, cool to room temperature, filter with suction, then wash 1-5 times with ethanol, and dry it. To obtain the intumescent flame retardant.

The flame retardant synergist is a cobalt zeolite flame retardant synergist.

The natural zeolite is one or more of analcime, laudonite, phillipsite, sodium zeolite, mordenite, heulandite, clinoptilolite, chabazite and faujasite.

The beneficial effects of the present invention are:

The present invention uses pentaerythritol dihydrogen phosphate melamine smoke as the flame retardant for a special flame-retardant polypropylene for the upper cover of a new energy automobile battery pack, which can consume more OH· and H· free radicals and increase the flame-retardant effect; natural zeolite It can form a carbon surface layer during combustion to prevent the transmission of flammable gases such as oxygen, and when natural zeolite and intumescent flame retardants are used together, the two can promote each other during the combustion process to form a silicon-containing protective layer, which is similar to conventional Compared with the carbon layer, the structure is denser, more stable, and has stronger oxidation resistance, which can greatly increase the flame retardancy of the present invention; the use of antioxidants, cobalt zeolite flame retardant synergist and natural zeolite to cooperate with each other, further increase the cost The flame retardancy of the invention inhibits the progress of the polymer oxidation process and avoids the spread of fire; the mutual cooperation of the lubricant and the compatibilizer can promote the uniform dispersion of various substances; the mutual cooperation of the above-mentioned substances makes the present invention have good flame retardancy and mechanical strength performance.

Detailed ways

The present invention will be further described with specific examples below: a flame-retardant polypropylene special for the upper cover of a new energy vehicle battery pack, in parts by mass, the flame-retardant polypropylene comprises 100 to 150 parts of polypropylene resin, and an intumescent flame retardant 40-60 parts, 5-10 parts of natural zeolite, 1-3 parts of compatibilizer, 0.1-0.5 parts of antioxidant, 2-3 parts of lubricant, 1-3 parts of flame retardant synergist.

The intumescent flame retardant is prepared by a method including the following steps:

Raw material weighing step: Weigh the raw materials according to the following weight parts: 10-15 parts of pentaerythritol, 15-20 parts of phosphorus oxychloride, 20-30 parts of melamine, 20-30 parts of ethylene glycol, and 50-100 parts of ethanol;

Reaction steps: add melamine into ethylene glycol to dissolve to obtain a melamine glycol solution; stir pentaerythritol and phosphorus oxychloride uniformly, and heat the oil bath at 100-150°C to reflux for 1-3 hours to obtain a viscous intermediate ; Stir the viscous intermediate and the melamine glycol solution evenly, heat at 80-120 ℃ and reflux for 2-4 hours. After the reaction is completed, cool to room temperature, filter with suction, then wash 1-5 times with ethanol, and dry it. To obtain the intumescent flame retardant.

The flame retardant synergist is a cobalt zeolite flame retardant synergist.

The natural zeolite is one or more of analcime, laudonite, phillipsite, sodium zeolite, mordenite, heulandite, clinoptilolite, chabazite and faujasite.

The application will be further elaborated below in conjunction with specific examples and comparative examples.

Comparison

A special flame-retardant polypropylene for the upper cover of a new energy vehicle battery pack. In parts by mass, the flame-retardant polypropylene comprises 100 parts of polypropylene resin, 40 parts of intumescent flame retardants, 0.5 parts of antioxidants, and 2 parts of lubricants. Copies.

Example 1

A special flame-retardant polypropylene for the upper cover of a new energy vehicle battery pack. In parts by mass, the flame-retardant polypropylene comprises 100 parts of polypropylene resin, 40 parts of intumescent flame retardant, 5 parts of natural zeolite, and 1 part of compatibilizer. Parts, 0.5 parts of antioxidant, 2 parts of lubricant, 1.5 parts of flame retardant synergist.

The intumescent flame retardant is prepared by a method including the following steps:

Raw material weighing step: Weigh the raw materials according to the following proportions by weight: 13 parts of pentaerythritol, 16 parts of phosphorus oxychloride, 22 parts of melamine, 22 parts of ethylene glycol, and 50 parts of ethanol;

Reaction steps: add melamine to ethylene glycol to dissolve to obtain melamine in ethylene glycol solution; stir pentaerythritol and phosphorus oxychloride uniformly, and heat the oil bath to reflux at 125°C for 2 hours to obtain a viscous intermediate; The ethylene glycol solution of the intermediate and melamine was stirred uniformly, heated at 90°C for reflux reaction for 2.5 hours, cooled to room temperature after the reaction was completed, filtered with suction, washed twice with ethanol, and dried to obtain the intumescent flame retardant.

The flame retardant synergist is a cobalt zeolite flame retardant synergist, the natural zeolite is an analcime, the compatibilizer is a maleic anhydride graft compatibilizer, and the antioxidant is antioxidant 1010, The lubricant is calcium stearate.

Example 2

This embodiment has many similarities with the first embodiment, and the similarities will not be repeated here. The differences are briefly described as follows:

A special flame-retardant polypropylene for the upper cover of a new energy vehicle battery pack. In parts by mass, the flame-retardant polypropylene comprises 100 parts of polypropylene resin, 39 parts of intumescent flame retardant, 6 parts of natural zeolite, and 1 part of compatibilizer. Parts, 0.5 parts of antioxidant, 2 parts of lubricant, 1.5 parts of flame retardant synergist.

Example 3

This embodiment has many similarities with the first embodiment, and the similarities will not be repeated here. The differences are briefly described as follows:

A special flame-retardant polypropylene for the upper cover of a new energy vehicle battery pack. In parts by mass, the flame-retardant polypropylene comprises 100 parts of polypropylene resin, 38 parts of intumescent flame retardant, 7 parts of natural zeolite, and 1 part of compatibilizer. Parts, 0.5 parts of antioxidant, 2 parts of lubricant, 1.5 parts of flame retardant synergist.

Example 4

This embodiment has many similarities with the first embodiment, and the similarities will not be repeated here. The differences are briefly described as follows:

A special flame-retardant polypropylene for the upper cover of a new energy vehicle battery pack. In parts by mass, the flame-retardant polypropylene comprises 100 parts of polypropylene resin, 37 parts of intumescent flame retardant, 8 parts of natural zeolite, and 1 part of compatibilizer. Parts, 0.5 parts of antioxidant, 2 parts of lubricant, 1.5 parts of flame retardant synergist.

The flame-retardant polypropylene materials prepared in Examples 1 to 4 and the polypropylene materials prepared in the comparative examples were tested for performance and limiting oxygen index. For performance testing, refer to GB/T1043-2008 and GB/T1040-2006; limiting oxygen index The test refers to GB/T2046-2008, and the test results are shown in Table 1.

Table 1 Performance parameter table of flame-retardant polypropylene prepared in each embodiment

Sample serial number	Tensile strength MPa	Impact strength kJ/m 2	Oxygen Index%
Comparison	16.3	5.2	18
Example 1	18.9	6.3	26.5
Example 2	20.1	7.2	27.3
Example 3	19.6	8.1	28.1
Example 4	18.3	8.5	26.4

The above test data shows that as the content of natural zeolite increases, the oxygen index of the present invention first increases and then decreases, indicating that there is a certain synergy between the natural zeolite and the intumescent flame retardant; and the flame retardant of the present invention The tensile strength, impact toughness and limiting oxygen index of polypropylene materials have been significantly improved.

The flame-retardant polypropylene materials prepared in Examples 1 to 4 and the polypropylene materials prepared in Comparative Examples were tested for thermal performance; at about 520°C, the Comparative Example was basically completely decomposed, and 32% of Example 1 was not decomposed. Examples 2 28% is not decomposed, Example 3 is 27%, and Example 3 is 29%. At about 670°C, Example 1 has 8% without decomposition, and Example 2 has 12% without decomposition. Example 11% of 3 is not decomposed, and 11% of Example 3 is not decomposed. The above phenomena indicate that the degradation structure of the sample without natural zeolite is unstable, but the sample with natural zeolite added, during the combustion process, the natural zeolite and the intumescent flame retardant can mutually promote each other to form a protective layer containing silicon. Compared with the conventional carbon layer, the protective layer has a denser structure, more stable structure, and stronger oxidation resistance, which can greatly increase the flame retardancy of the present invention.

Although the technical solutions of the present invention have been described and enumerated in more detail, it should be understood that for those skilled in the art, it is important for those skilled in the art to modify the above-mentioned embodiments or adopt equivalent alternatives. Obviously, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of the present invention.

Claims (4)

1. A special flame-retardant polypropylene for the upper cover of a new energy vehicle battery pack, which is characterized in that: in parts by mass, the flame-retardant polypropylene comprises 100-150 parts of polypropylene resin, 30-50 parts of intumescent flame retardant, natural 5-10 parts of zeolite, 1-3 parts of compatibilizer, 0.1-0.5 parts of antioxidant, 2-3 parts of lubricant, 1-3 parts of flame retardant synergist.
2. The special flame-retardant polypropylene for the upper cover of a new energy automobile battery pack according to claim 1, wherein the intumescent flame retardant is prepared by a method including the following steps:

   Raw material weighing step: Weigh the raw materials according to the following weight parts: 10-15 parts of pentaerythritol, 15-20 parts of phosphorus oxychloride, 20-30 parts of melamine, 20-30 parts of ethylene glycol, and 50-100 parts of ethanol;

   Reaction steps: add melamine into ethylene glycol to dissolve to obtain a melamine glycol solution; stir pentaerythritol and phosphorus oxychloride uniformly, and heat the oil bath at 100-150°C to reflux for 1-3 hours to obtain a viscous intermediate ; Stir the viscous intermediate and the melamine glycol solution evenly, heat at 80-120 ℃ and reflux for 2-4 hours, cool to room temperature after the reaction is complete, filter with suction, and then wash with ethanol for 1-5 times, and dry it. To obtain the intumescent flame retardant.
3. The flame-retardant polypropylene special for the upper cover of a new energy automobile battery pack according to claim 1, wherein the flame-retardant synergist is a cobalt zeolite flame-retardant synergist.
4. The special flame-retardant polypropylene for the upper cover of a new energy automobile battery pack according to claim 1, wherein the natural zeolite is analcime, laumontite, phillipsite, natrolite, mordenite, heulandite, One or more of clinoptilolite, chabazite and faujasite.