Preparation method of halogen-free flame-retardant and high-toughness modified polycarbonate (PC)

A polycarbonate, high-toughness technology, used in the preparation of modified polycarbonate, can solve the problems of fragile products, low mechanical strength and impact strength, etc., and achieve improved flame retardant effect, good color, and stable flame retardant performance. Effect

Inactive Publication Date: 2012-10-10
浙江杭海塑业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that the price and cost are advantageous, but the biggest disadvantage is that the mechanical strength of the product, especially the notched impact strength is very low, the product is particularly fragile, and cannot be used in many occasions

Method used

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  • Preparation method of halogen-free flame-retardant and high-toughness modified polycarbonate (PC)
  • Preparation method of halogen-free flame-retardant and high-toughness modified polycarbonate (PC)
  • Preparation method of halogen-free flame-retardant and high-toughness modified polycarbonate (PC)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Powdered raw materials: 8 parts of polycarbonate powder, 0.07 part of potassium benzenesulfonylbenzenesulfonate (KSS) flame retardant, 0.5 part of antioxidant 1010, and 0.016 part of toner.

[0034] Granular raw materials: 83 parts of polycarbonate particles, 8.414 parts of high-temperature vulcanized silicone toughening agent.

[0035] Preparation: Mix the above weight parts of powder in a high-speed mixer, and then send them into the powder feeding hopper; mix the above weight parts of granules in a particle mixer, and then send them into the particle hopper; then use a computer to control according to the formula ratio Feeding ratio and feeding amount, after the heating part of the twin-screw extruder reaches the extrusion temperature of 270°C, control the feeding according to the set feeding ratio, and the twin-screw extruder will melt, mix and extrude the above raw materials; Finally, the extruded material is cooled and pelletized, weighed and packaged to obtain gra...

Embodiment 2

[0038] The preparation method is the same as in Example 1. The difference is the selection and proportioning of powder and pellets. The flame retardant is 2,4,5-trichlorobenzenesulfonate sodium (STB), and the antioxidant is antioxidant 168. The specific ratio is shown in Table 1, and the test results are shown in Table 3.

Embodiment 3

[0040] The preparation method is the same as in Example 2. The difference is the ratio of powder and pellets and the powder contains cross-linked butadiene rubber powder matting agent, the specific ratio is shown in Table 1.

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Abstract

The invention relates to a preparation method of modified polycarbonate (PC), in particular to a preparation method of halogen-free flame-retardant and high-toughness modified PC. The preparation method comprises the following steps of: preparing a powder raw material from 5-10 parts by weight of PC powder, 0.03-0.1 part by weight of sulphonate flame retardant, 0.1-1 part by weight of antioxidantand 0.01-0.02 part by weight of toner; preparing a particle raw material from 75-85 parts by weight of PC particles and 4.86-10 parts by weight of silicon rubber toughening agent; mixing powder with particles respectively in different stirrers; and feeding the mixture of the powder and the particles into different feeding hoppers, extruding by using a double screw extruder, cooling, dicing and packing. A small amount of flame retardant is uniformly dispersed into the entire material, the cooperative and synergistic action of the halogen-free flame retardance and toughening property of the modified PC is brought into play after the flame retardant is combined with the silicon rubber toughening agent, and superior combination is realized, so that the modified PC has high flame resistance and shock strength, and the prepared modified PC has stable performance.

Description

technical field [0001] The invention relates to a preparation method of modified polycarbonate. Background technique [0002] Although the flame retardancy of polycarbonate (PC) (oxygen index is 21% to 24%, and the flame retardancy reaches uL94V-2 level) is better than ordinary thermoplastic polymers (such as polyethylene, polypropylene, etc.), it is still difficult to Meet the flame retardant requirements of certain application fields, such as many applications in electronic appliances, as well as indoor construction and household products, generally have flame retardant requirements for materials (V-0 / 3.2mm or Glow wire 960 degrees), but now Some PCs cannot meet the requirements of such products, so PC must be modified for flame retardancy. Generally, the purpose of flame retardant modification can be achieved by adding flame retardants to polymers or introducing elements such as bromine, phosphorus, and silicon during polymer synthesis. At present, flame retardants for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L69/00C08L83/04C08K13/02C08K5/42B29C47/92B29C48/92
CPCB29C48/40B29C48/92B29C2948/926B29C2948/92704B29C2948/92895
Inventor 姚为忠
Owner 浙江杭海塑业有限公司
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