CN109627746B - Large negative pressure polyurethane front end fragile protective cover and forming method thereof - Google Patents

Large negative pressure polyurethane front end fragile protective cover and forming method thereof Download PDF

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CN109627746B
CN109627746B CN201811406813.5A CN201811406813A CN109627746B CN 109627746 B CN109627746 B CN 109627746B CN 201811406813 A CN201811406813 A CN 201811406813A CN 109627746 B CN109627746 B CN 109627746B
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parts
component
protective cover
negative pressure
temperature
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CN109627746A (en
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陈建平
陆璘
饶安梅
汪鑫
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Guizhou Aerospace Tianma Electrical Technology Co Ltd
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Guizhou Aerospace Tianma Electrical Technology Co Ltd
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
    • C08J9/143—Halogen containing compounds
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    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/16—Catalysts
    • C08G18/161—Catalysts containing two or more components to be covered by at least two of the groups C08G18/166, C08G18/18 or C08G18/22
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    • C08G18/165—Catalysts containing two or more components to be covered by at least two of the groups C08G18/166, C08G18/18 or C08G18/22 covered by C08G18/18 and C08G18/22 covered by C08G18/18 and C08G18/24
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
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    • C08G18/16—Catalysts
    • C08G18/18—Catalysts containing secondary or tertiary amines or salts thereof
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
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    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
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    • C08G18/4018—Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48
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    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
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    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
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    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
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    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
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    • C08G2101/00—Manufacture of cellular products
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    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
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    • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
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    • C08J2479/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2461/00 - C08J2477/00
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    • C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
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  • Inorganic Chemistry (AREA)
  • Polyurethanes Or Polyureas (AREA)

Abstract

The invention discloses a high negative pressure polyurethane front-end fragile protective cover and a forming method thereof, and the front-end fragile protective cover prepared by the method and the formula can meet the application performance requirement of negative pressure more than 600 KPa; the aromatic polyester polyol with higher hydroxyl content and linear structure is added in the polyurethane forming formula, so that the molecular structure of the polyurethane material is improved, and the toughness of the polyurethane material is enhanced; and then the catalyst combination is optimized, foam is crosslinked, and good mechanical properties are provided, so that the front-end fragile protective cover cannot be damaged under the condition that the negative pressure is more than 600 KPa.

Description

Large negative pressure polyurethane front end fragile protective cover and forming method thereof
Technical Field
The invention belongs to the technical field of composite material design, and particularly relates to a fragile protective cover at the front end of high-negative-pressure polyurethane and a forming method thereof.
Background
The fragile protective cover is an important component in a missile storage and launching system, plays a role in sealing and protecting during transportation and storage, and needs to be opened quickly during launching, so that the posture of the missile cannot be influenced. The fragile protective cover does not have a predetermined shape, and is required to have characteristics such as a simple structure, a light weight, a high strength, a high designability, and high corrosion resistance.
When an aircraft is launched, the front-end fragile protective cover body is broken under the action of gas flow shock waves, the front-end fragile protective cover is opened by the body fragments and moves forwards, the launching track of the aircraft cannot be interfered by the opened front-end fragile protective cover, the gas flow impact when the adjacent aircraft is launched is considered, the negative pressure requirement of the front-end fragile protective cover is greater than 600kPa, the fragile protective cover meeting the application characteristic of high negative pressure is required to be designed, and the design problem is solved at present.
Patents CN104913692A and CN105017757A disclose a frangible lid using rigid polyurethane foam as a main body material, which is formed by a chemical foaming method, and has the advantages of simple operation, short forming period, and low cost, but the polyurethane foam has poor high and low temperature resistance, weather resistance, and aging resistance, which affect the service life and maintenance performance of the frangible lid, and it is understood that most of the rigid polyurethane foams developed by the technology can only be used at 100 ℃, and the application range is limited.
Disclosure of Invention
The invention aims to design a fragile protective cover at the front ends of large positive and negative polyurethane, which meets the application performance requirement that the negative pressure requirement is more than 600 kPa. In order to achieve the purpose, the aromatic polyester polyol with higher hydroxyl content and linear structure is added in the formula of the fragile protective cover at the front end of the polyurethane, so that the molecular structure of the polyurethane material is improved, and the toughness of the polyurethane material is enhanced; the catalyst combination is optimized, foam is crosslinked, and the good mechanical property is provided, so that the problem of design of the formula of the fragile protective cover at the front end of the polyurethane with the negative pressure requirement of more than 600kPa is solved.
The method is realized according to the following technical scheme:
a fragile protective cover at the front end of high negative pressure polyurethane is made of polyurethane foam materials, wherein the polyurethane foam materials are prepared from A, B components in a mass ratio of 100: 130-145 parts by weight; the component A comprises the following raw materials in parts by weight: 90-115 parts of polyether polyol, 12-20 parts of polyester polyol, 1-6 parts of silicone oil, 0.1-1.6 parts of amine catalyst, 0.1-0.3 part of organic tin catalyst, 0.1-0.6 part of aging agent, 1.2-1.7 parts of hydrolysis resistant agent, 6-13 parts of flame retardant and 2-20 parts of foaming agent; the component B is isocyanate.
Further, the polyurethane foam material is prepared from A, B components in a mass ratio of 100: 138; the component A comprises the following raw materials in parts by weight: 100 parts of polyether polyol, 15 parts of polyester polyol, 3 parts of silicone oil, 0.9 part of amine catalyst, 0.3 part of organic tin catalyst, 0.3 part of aging agent, 1.5 parts of hydrolysis resistant agent, 7-12 parts of flame retardant and 2-20 parts of foaming agent.
Further, the polyester polyol is aromatic polyester polyol.
Further, the amine catalyst is preferably triethanolamine.
Further, the aging agent is any one of an ultraviolet light resistant absorbent or an antioxidant.
Further, the hydrolysis-resistant agent is preferably polycarbodiimide.
Further, the flame retardant is preferably an organic phosphorus flame retardant.
Further, the blowing agent is preferably HCFC.
The invention also provides a forming method of the fragile protective cover at the front end of the high-negative-pressure polyurethane, which comprises the following steps:
1) weighing the component A, fully stirring, weighing the component B, placing the component B into another container, and placing the two containers into a constant temperature and humidity box for heat preservation for 0.8-1.1 h;
2) taking out A, B groups after heat preservation, pouring the component B into the component A and stirring uniformly after fully stirring the component A;
3) and (3) measuring the temperature of the sample by using an infrared thermometer, pouring the material into a mold when the temperature of the material is 35-41 ℃, covering an upper mold and locking, standing the mold, curing in an oven for 1.8-2 h, and demolding when the temperature is cooled to 33-37 ℃.
Further, the temperature of the constant temperature and humidity box in the step (1) is controlled to be 20-25 ℃, and the relative humidity of air is controlled to be 20-35%.
Further, the curing temperature in the step (3) is 98-102 ℃.
The invention has the beneficial effects that:
the front-end fragile protective cover meets the application performance requirement under the condition that the negative pressure is greater than 600 kPa. The manufacturing material of the front fragile protective cover contains polyether polyol, and particularly, the molecular structure of the polyurethane material is improved and the toughness of the polyurethane material is enhanced by utilizing the characteristics that aromatic polyester polyol has high hydroxyl content and is of a linear structure.
Meanwhile, catalyst components are optimized, the foam crosslinking effect is improved, and the mechanical property of the polyurethane material is improved, for example, the convex surface of the cover faces towards the pressure containing cavity of the test tool, the concave surface faces outwards to be assembled, dry gas is filled into the containing cavity until the protective cover is broken, pressure data is read, and the negative pressure resistance test result shows that the negative pressure resistance value is obviously increased. The invention utilizes the organic tin catalyst to promote the reaction of isocyanate and polyol, cross-link foam, give polyurethane foam good mechanical property, and combine with amine catalyst to effectively remove free isocyanic acid radical-NCO, so that the material performance is stable, and simultaneously the skeleton structure of the material is increased, thereby increasing the strength.
The protective cover of example 1 was applied to a system as a polyurethane front frangible protective cover that was intact at negative pressure of 600 kPa; by adopting the molding formula design method, the result of formula optimization is as follows: aromatic polyester polyol with high hydroxyl content and a linear structure is added in the molding formula, the molecular structure of the polyurethane material is improved, and the toughness of the polyurethane material is enhanced; optimizing the catalyst combination, and performing foam crosslinking to give the catalyst combination good mechanical properties; the front cover can not be damaged under the condition that the negative pressure is 600KPa, and the problem that the negative pressure is more than 600KPa cannot be met by the traditional formula design method is broken through.
Detailed Description
The present invention will be described in further detail with reference to the following examples, but it should be understood that the scope of the subject matter of the present invention is not limited to the examples described below, and various modifications, substitutions and alterations based on the common technical knowledge and conventional means in the art are included in the scope of the present invention without departing from the technical idea of the present invention.
Example 1
A fragile protective cover at the front end of high negative pressure polyurethane is prepared from A, B components in a mass ratio of 100: 138, the component A comprises the following substances in parts by weight: 100 parts of polypropylene oxide glycol, 15 parts of aromatic polyester polyol, 3 parts of silicone oil, 0.3 part of organic tin catalyst, 0.9 part of triethanolamine, 0.3 part of phosphite antioxidant, 1.5 parts of polycarbodiimide, 9 parts of organic phosphorus flame retardant and 10 parts of HCFC; the component B is isocyanate;
the embodiment also provides a method for molding the protective cover with the fragile front end, which comprises the following steps:
1) weighing the component A, fully stirring, weighing the component B, placing the component B in another container, and placing the two containers in a constant temperature and humidity box for heat preservation for 1 h;
2) taking out A, B groups after heat preservation, pouring the component B into the component A and stirring uniformly after fully stirring the component A;
3) measuring the temperature of a test material by using an infrared thermometer, pouring the material into a mold when the temperature of the material is 40 ℃, covering an upper mold and locking, standing the mold, placing the mold in an oven for curing for 2 hours, and demolding when the temperature is cooled to 35 ℃;
further, the temperature of the constant temperature and humidity box in the step (1) is controlled at 22 ℃, and the relative humidity of air is controlled at 28%;
further, the curing temperature in the step (3) is 100 ℃.
Example 2
A fragile protective cover at the front end of high negative pressure polyurethane is made of polyurethane foam materials, wherein the polyurethane foam materials are prepared from A, B components in a mass ratio of 100: 145; the component A comprises the following raw materials in parts by weight: 115 parts of polytetrahydrofuran diol, 20 parts of aromatic polyester polyol, 6 parts of silicone oil, 1.6 parts of high-activity tertiary amine catalyst, 0.3 part of organic tin catalyst, 0.6 part of ultraviolet-resistant absorbent, 1.7 parts of polycarbodiimide, 13 parts of organic phosphorus flame retardant and 20 parts of HCFC; the component B is isocyanate;
the embodiment also provides a method for forming the fragile protective cover at the front end of the high-negative-pressure polyurethane, which is characterized in that: the method comprises the following steps:
1) weighing the component A, fully stirring, weighing the component B, placing the component B in another container, and placing the two containers in a constant temperature and humidity box for heat preservation for 1.1 h;
2) taking out A, B groups after heat preservation, pouring the component B into the component A and stirring uniformly after fully stirring the component A;
3) and (3) measuring the temperature of the sample by using an infrared thermometer, pouring the material into a mold when the temperature of the material is 41 ℃, covering an upper mold and locking, standing the mold, curing in an oven for 2 hours, and demolding when the temperature is cooled to 33-37 ℃.
Further, the temperature of the constant temperature and humidity box in the step (1) is controlled at 25 ℃, and the relative humidity of air is controlled at 20%.
1) Further, the temperature of the curing in the step (3) is 102 ℃.
Example 3
A fragile protective cover at the front end of high negative pressure polyurethane is made of polyurethane foam materials, wherein the polyurethane foam materials are prepared from A, B components in a mass ratio of 100: 130; the component A comprises the following raw materials in parts by weight: 90 parts of polyether polyol, 12 parts of aromatic polyester polyol, 1 part of silicone oil, 0.1 part of amine catalyst, 0.1 part of organic tin catalyst, 0.1 part of phosphite antioxidant, 1.2 parts of hydrolysis resistant agent, 6 parts of flame retardant and 2 parts of foaming agent; the component B is isocyanate;
the embodiment also provides a method for forming the fragile protective cover at the front end of the high-negative-pressure polyurethane, which comprises the following steps of:
1) weighing the component A, fully stirring, weighing the component B, placing the component B into another container, and placing the two containers into a constant temperature and humidity box for heat preservation for 0.8 h;
2) taking out A, B groups after heat preservation, pouring the component B into the component A and stirring uniformly after fully stirring the component A;
3) measuring the temperature of a test material by using an infrared thermometer, pouring the test material into a mold when the temperature of the test material is 35 ℃, covering an upper mold and locking, standing the mold, placing the mold in an oven for curing for 1.8h, and demolding after the temperature is cooled to 33 ℃;
further, the temperature of the constant temperature and humidity box in the step (1) is controlled to be 20 ℃, and the relative humidity of air is controlled to be 20-35%;
further, the temperature of the curing in the step (3) is 98 ℃.
Example 4
A fragile protective cover at the front end of high negative pressure polyurethane is prepared from A, B components in a mass ratio of 100: 140, wherein the component A consists of the following substances in parts by weight: 100 parts of tetrahydrofuran-propylene oxide copolymerized glycol, 15 parts of aromatic polyester polyol, 3 parts of silicone oil, 0.3 part of triethanolamine, 0.1 part of organic tin catalyst, 0.3 part of ultraviolet-resistant absorbent, 1.5 parts of polycarbodiimide, 9 parts of organic phosphorus flame retardant and 10 parts of HCFC; the component B is isocyanate;
the embodiment also provides a method for molding the protective cover with the fragile front end, which comprises the following steps:
1) weighing the component A, fully stirring, weighing the component B, placing the component B in another container, and placing the two containers in a constant temperature and humidity box for heat preservation for 1 h;
2) taking out A, B groups after heat preservation, pouring the component B into the component A and stirring uniformly after fully stirring the component A;
3) measuring the temperature of a test material by using an infrared thermometer, pouring the material into a mold when the temperature of the material is 35 ℃, covering an upper mold and locking, standing the mold, placing the mold in an oven for curing for 2 hours, and demolding when the temperature is cooled to 35 ℃;
further, the temperature of the constant temperature and humidity box in the step (1) is controlled at 25 ℃, and the relative humidity of air is controlled at 30%;
further, the curing temperature in the step (3) is 100 ℃.
Example 5
A fragile protective cover at the front end of high negative pressure polyurethane is prepared from A, B components in a mass ratio of 100: 138, the component A comprises the following substances in parts by weight: 100 parts of polytetrahydrofuran polyol, 15 parts of aromatic polyester polyol, 3 parts of silicone oil, 0.9 part of high-activity tertiary amine catalyst, 0.2 part of organic tin catalyst, 0.3 part of phosphite antioxidant, 1.5 parts of polycarbodiimide, 9 parts of organic phosphorus flame retardant and 10 parts of HCFC; the component B is isocyanate;
the embodiment also provides a method for molding the protective cover with the fragile front end, which comprises the following steps:
1) weighing the component A, fully stirring, weighing the component B, placing the component B into another container, and placing the two containers into a constant temperature and humidity box for heat preservation for 0.8 h;
2) taking out A, B groups after heat preservation, pouring the component B into the component A and stirring uniformly after fully stirring the component A;
3) measuring the temperature of a sample by using an infrared thermometer, pouring the material into a mold when the temperature of the material is 35-41 ℃, covering an upper mold and locking, standing the mold, curing in an oven for 1.8h, and demolding when the temperature is cooled to 33-37 ℃;
further, the temperature of the constant temperature and humidity box in the step (1) is controlled at 20 ℃, and the relative humidity of air is controlled at 35%;
further, the temperature of the curing in the step (3) is 98 ℃.
Comparative example 1
A fragile protective cover at the front end of high negative pressure polyurethane is prepared from A, B components in a mass ratio of 100: 138, the component A comprises the following substances in parts by weight: 100 parts of polypropylene oxide glycol, 15 parts of aliphatic polyester polyol, 3 parts of silicone oil, 0.3 part of organic tin catalyst, 0.9 part of triethanolamine, 0.3 part of phosphite antioxidant, 1.5 parts of polycarbodiimide, 9 parts of organic phosphorus flame retardant and 10 parts of HCFC; the component B is isocyanate;
the embodiment also provides a method for molding the protective cover with the fragile front end, which comprises the following steps:
1) weighing the component A, fully stirring, weighing the component B, placing the component B in another container, and placing the two containers in a constant temperature and humidity box for heat preservation for 1 h;
2) taking out A, B groups after heat preservation, pouring the component B into the component A and stirring uniformly after fully stirring the component A;
3) measuring the temperature of a test material by using an infrared thermometer, pouring the material into a mold when the temperature of the material is 40 ℃, covering an upper mold and locking, standing the mold, placing the mold in an oven for curing for 2 hours, and demolding when the temperature is cooled to 35 ℃;
further, the temperature of the constant temperature and humidity box in the step (1) is controlled at 22 ℃, and the relative humidity of air is controlled at 28%;
further, the curing temperature in the step (3) is 100 ℃.
Comparative example 2
A fragile protective cover at the front end of high negative pressure polyurethane is prepared from A, B components in a mass ratio of 100: 138, the component A comprises the following substances in parts by weight: 100 parts of polypropylene oxide glycol, 25 parts of aromatic polyester polyol, 3 parts of silicone oil, 0.2 part of organic tin catalyst, 0.9 part of triethanolamine, 0.3 part of phosphite antioxidant, 1.5 parts of polycarbodiimide, 9 parts of organic phosphorus flame retardant and 10 parts of HCFC; the component B is isocyanate;
the embodiment also provides a method for molding the protective cover with the fragile front end, which comprises the following steps:
1) weighing the component A, fully stirring, weighing the component B, placing the component B in another container, and placing the two containers in a constant temperature and humidity box for heat preservation for 1 h;
2) taking out A, B groups after heat preservation, pouring the component B into the component A and stirring uniformly after fully stirring the component A;
3) measuring the temperature of a test material by using an infrared thermometer, pouring the material into a mold when the temperature of the material is 40 ℃, covering an upper mold and locking, standing the mold, placing the mold in an oven for curing for 2 hours, and demolding when the temperature is cooled to 35 ℃;
further, the temperature of the constant temperature and humidity box in the step (1) is controlled to be 22 ℃, and the relative humidity of air is controlled to be 20-35%;
further, the curing temperature in the step (3) is 100 ℃.
Comparative example 3
A fragile protective cover at the front end of high negative pressure polyurethane is prepared from A, B components in a mass ratio of 100: 138, the component A comprises the following substances in parts by weight: 100 parts of polypropylene oxide glycol, 15 parts of aromatic polyester polyol, 3 parts of silicone oil, 0.9 part of triethanolamine, 0.3 part of phosphite antioxidant, 1.5 parts of polycarbodiimide, 9 parts of organic phosphorus flame retardant and 10 parts of HCFC; the component B is isocyanate;
the embodiment also provides a method for molding the protective cover with the fragile front end, which comprises the following steps:
1) weighing the component A, fully stirring, weighing the component B, placing the component B in another container, and placing the two containers in a constant temperature and humidity box for heat preservation for 1 h;
2) taking out A, B groups after heat preservation, pouring the component B into the component A and stirring uniformly after fully stirring the component A;
3) measuring the temperature of a test material by using an infrared thermometer, pouring the material into a mold when the temperature of the material is 40 ℃, covering an upper mold and locking, standing the mold, placing the mold in an oven for curing for 2 hours, and demolding when the temperature is cooled to 35 ℃;
further, the temperature of the constant temperature and humidity box in the step (1) is controlled to be 22 ℃, and the relative humidity of air is controlled to be 20-35%;
further, the curing temperature in the step (3) is 100 ℃.
The protective covers prepared in examples 1 to 5 and comparative examples 1 to 3 of the present application were subjected to a negative pressure resistance test, and the experimental results are shown in table 1 below.
TABLE 1 test results of negative pressure resistance of protective cover
Group of Pressure when the protective cover is broken
Example 1 762kPa
Example 2 706kPa
Example 3 718kPa
Example 4 667kPa
Example 5 725kPa
Comparative example 1 535kPa
Comparative example 2 588kPa
Comparative example 3 571kPa
As can be seen from the experimental data in Table 1, the protective covers prepared in examples 1 to 5 have better negative pressure resistance and can meet the application performance requirement under the condition that the negative pressure requirement is more than 600kPa compared with the protective covers prepared in comparative examples 1 to 3.

Claims (8)

1. A fragile protective cover at the front end of high negative pressure polyurethane is made of polyurethane foam materials, and is characterized in that the polyurethane foam materials are prepared from A, B components in a mass ratio of 100: 130-145 parts by weight; the component A comprises the following raw materials in parts by weight: 90-115 parts of polyether polyol, 12-20 parts of polyester polyol, 1-6 parts of silicone oil, 0.1-1.6 parts of amine catalyst, 0.1-0.3 part of organic tin catalyst, 0.1-0.6 part of anti-aging agent, 1.2-1.7 parts of anti-hydrolysis agent, 6-13 parts of flame retardant and 2-20 parts of foaming agent; the component B is isocyanate;
the polyester polyol is aromatic polyester polyol;
the amine catalyst is triethanolamine.
2. The high negative pressure polyurethane front end frangible protective cover of claim 1, wherein: the component A comprises the following raw materials in parts by weight: 100 parts of polyether polyol, 15 parts of polyester polyol, 3 parts of silicone oil, 0.9 part of amine catalyst, 0.3 part of organic tin catalyst, 0.3 part of anti-aging agent, 1.5 parts of anti-hydrolysis agent, 7-12 parts of flame retardant and 2-20 parts of foaming agent.
3. The high negative pressure polyurethane front end frangible protective cover of claim 1, wherein: the anti-aging agent is any one of an ultraviolet-resistant absorbent or an antioxidant.
4. The high negative pressure polyurethane front end frangible protective cover of claim 1, wherein: the hydrolysis-resistant agent is polycarbodiimide.
5. The high negative pressure polyurethane front end frangible protective cover of claim 1, wherein: the flame retardant is an organic phosphorus flame retardant.
6. The method for forming the high negative pressure polyurethane front fragile protective cover as claimed in claim 1, wherein: the method comprises the following steps:
1) weighing the component A, fully stirring, weighing the component B, placing the component B into another container, and placing the two containers into a constant temperature and humidity box for heat preservation for 0.8-1.1 h;
2) taking out A, B groups after heat preservation, pouring the component B into the component A and stirring uniformly after fully stirring the component A;
3) and (3) measuring the temperature of the sample by using an infrared thermometer, pouring the material into a mold when the temperature of the material is 35-41 ℃, covering an upper mold and locking, standing the mold, curing in an oven for 1.8-2 h, and demolding when the temperature is cooled to 33-37 ℃.
7. The method for forming the high negative pressure polyurethane front fragile protective cover as claimed in claim 6, wherein: in the step (1), the temperature of the constant temperature and humidity box is controlled to be 20-25 ℃, and the relative humidity of air is controlled to be 20-35%.
8. The method for forming the high negative pressure polyurethane front fragile protective cover as claimed in claim 6, wherein: the curing temperature in the step (3) is 98-102 ℃.
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