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Preparation method for high-strength high-toughness flame-retardant polyamide

A technology of flame-retardant polyamide and high toughness, which is applied in the field of preparation of flame-retardant polyamide, which can solve the problems of affecting the surface finish of products, affecting the mechanical properties of substrates, and improving product density, so as to improve production capacity and product appearance quality and Smoothness, improve processing fluidity, slow down the effect of heat aging

Inactive Publication Date: 2012-06-13
上海华谊集团华原化工有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, among the existing commonly used flame retardants, traditional halogen-containing flame retardants such as polybrominated diphenyl ethers and polybrominated biphenyls have high flame retardant efficiency, less dosage, and little impact on material properties, but they do not comply with the EU ROHS directive, which seriously restricts the export of products Inorganic flame retardants, phosphorus flame retardants such as magnesium hydroxide, phosphoric acid esters and other flame retardants should be added in large amounts to reach the V-0 level, or will seriously affect the mechanical properties of the substrate, as disclosed in the publication number CN101423666 A halogen-free flame-retardant nylon 6 composition with high toughness and antistatic properties. The mentioned product prepared with activated magnesium hydroxide and phosphate oligomer as flame retardant has a tensile strength of 50 MPa and a notched impact strength of 5kj / m 2 , which is about 20% lower than that of nylon 6, and the flame retardant performance can only reach UL94V-0 (3.2mm); nitrogen-based flame retardants such as melamine compound MCA have a better flame retardant effect, but because MCA will make polyamide in The droplet phenomenon is serious when burning, and it is difficult to reach the UL-94V-0 level. US 5482985 proposes to use melamine compounds in combination with inorganic fillers such as magnesium hydroxide, but in order to obtain the required flame retardancy, the amount of melamine compounds is relatively high , resulting in a greater loss of mechanical properties of the material
In addition, in order to solve the problem of the decline in the mechanical properties of nylon after adding flame retardants, the general practice is to add glass fiber or carbon fiber reinforcement. Although this can greatly improve the tensile strength and impact strength of nylon, it will increase the density of the product and affect Product surface finish, which limits uses

Method used

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  • Preparation method for high-strength high-toughness flame-retardant polyamide
  • Preparation method for high-strength high-toughness flame-retardant polyamide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In terms of parts by mass, 100 parts of nylon 6 with a viscosity of 2.5 was dried with a vacuum rotary drier and mixed with 18 parts of decabromodiphenylethane, 5 parts of antimony trioxide, 3 parts of polyvinyl carbon black, 0.5 parts of light Calcium stearate and 1 part of antioxidant 1098 are mixed evenly and added to the twin-screw extruder from the feeder. The temperature is 240°C, the temperature in the fourth zone is 235°C, the temperature in the fifth zone is 230°C, the temperature in the sixth zone is 230°C, the temperature in the seventh zone is 235°C, the temperature in the eighth zone is 240°C, the temperature of the head is 240°C, and the speed of the main engine is 240r / min. Extrude, cool, dry, and pelletize through the head of the machine to obtain a flame-retardant polyamide composition product. The prepared composite product is injection-molded into a standard sample bar for testing according to a standard size, and the physical properties are tested ac...

Embodiment 2

[0022] In terms of parts by mass, 100 parts of nylon 6 with a viscosity of 2.8 was dried with a vacuum rotary drier and mixed with 16 parts of decabromodiphenylethane, 4 parts of antimony trioxide, 0.5 parts of light calcium stearate, 0.8 parts of antimony Oxygen 1098 is mixed evenly and fed into the twin-screw extruder from the feeder. The temperature of the first zone of the extruder from the feeding port to the die head is 220°C, the temperature of the second zone is 260°C, the temperature of the third zone is 250°C, and the temperature of the fourth zone is 240°C ℃, the temperature in the fifth zone is 235°C, the temperature in the sixth zone is 235°C, the temperature in the seventh zone is 240°C, the temperature in the eighth zone is 245°C, the temperature of the head is 245°C, the speed of the main engine is 240r / min, extrusion from the head of the extruder, cooling, Dried and pelletized to obtain a flame-retardant polyamide composition product. The prepared composite pr...

Embodiment 3

[0024] In terms of parts by mass, 100 parts of nylon 66 with a viscosity of 2.7 was dried with a vacuum rotary drier and mixed with 18 parts of decabromodiphenylethane, 5 parts of antimony trioxide, 3 parts of polyvinyl carbon black, 0.5 parts of light Calcium stearate and 1 part of antioxidant 1098 are mixed evenly and added to the twin-screw extruder from the feeder. The temperature is 260°C, the temperature in the fourth zone is 250°C, the temperature in the fifth zone is 240°C, the temperature in the sixth zone is 240°C, the temperature in the seventh zone is 245°C, the temperature in the eighth zone is 250°C, the temperature of the head is 255°C, and the speed of the main engine is 300r / min. Extrude, cool, dry, and pelletize through the head of the machine to obtain a flame-retardant polyamide composition product. The prepared composite product is injection-molded into a standard sample bar for testing according to a standard size, and the physical properties are tested a...

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Abstract

The invention relates to a preparation method for high-strength high-toughness flame-retardant polyamide. According to the method, based on 100 parts by weight of polyamide with a relative viscosity of 2.4 to 3.3, 15 to 30 parts by weight of a decabromodiphenylethane fire retardant, 3 to 10 parts by weight of an antimony oxide fire retardant, 0 to 5 parts by weight of a light stabilizer, 0.2 to 1part by weight of a heat stabilizer and 0.5 to 1 part by weight of an anti-oxidant are added so as to obtain a mixture, and the mixture is subjected to melt mixing and extrusion in virtue of a double-screw extruder and then undergoes cooling, drying and pelletizing so as to obtain the high-strength high-toughness flame-retardant polyamide. The method provided in the invention enables nylon to have improved flame retardation and aging resistance and good mechanical properties and allows a product of nylon to have good surface appearance; combined utilization of decabromodiphenylethane and antimony oxide for modification of polyamide enables purposes of the invention to be achieved.

Description

1. Technical field [0001] The present invention relates to a preparation method of high-strength and high-toughness flame-retardant polyamide, more precisely to a kind of electrical and electronic equipment and home appliances used for injection molding that meet the requirements of environmental protection and flame-retardant, especially for the mechanics of photovoltaic cell components. A method for preparing flame-retardant polyamide with excellent performance. 2. Background technology [0002] It is well known that polyamide has many advantages, such as: excellent impact resistance, low temperature resistance, excellent electrical properties and chemical resistance, good processing fluidity, easy extrusion, injection molding, etc. However, the general flame retardant grade of polyamide is UL94V-2, which is still combustible and has the risk of causing fire. Therefore, it is necessary to improve its flame retardant performance and expand its use (electrical equipment par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/00C08L77/02C08L77/06C08K13/02C08K5/03C08K3/22B29B9/06B29C47/92B29C48/92
CPCB29C48/04B29C48/40B29C48/911
Inventor 石磊冯宁沈树英
Owner 上海华谊集团华原化工有限公司
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