Anti-stress cracking agent, preparation method and application thereof as well as anti-stress PC (Poly Carbonate) polyester

An anti-stress cracking and anti-stress technology, applied in the field of materials, can solve problems such as long cycle, fast cooling speed, and trouble

Active Publication Date: 2013-12-11
北京航天凯恩新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. Mold temperature: PC has high viscosity, poor fluidity, is not sensitive to shearing, and has a fast cooling rate. It is easy to cause defects on the surface of the part, and stress is formed inside, causing cracks.
Since annealing is cumbersome in process and the cycle is relatively long, there are more and more researches on PC stress cracking agents.

Method used

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  • Anti-stress cracking agent, preparation method and application thereof as well as anti-stress PC (Poly Carbonate) polyester
  • Anti-stress cracking agent, preparation method and application thereof as well as anti-stress PC (Poly Carbonate) polyester
  • Anti-stress cracking agent, preparation method and application thereof as well as anti-stress PC (Poly Carbonate) polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0037] Embodiment 1~5: the preparation of anti-stress cracking agent

[0038] The raw materials were weighed according to the ratio in Table 1, and the anti-stress cracking agent was prepared.

[0039] Table 1:

[0040]

[0041] The preparation method of Examples 1-5 is: mix maleic anhydride, styrene, and linear low-density polyethylene uniformly in proportion, adopt dibenzoyl peroxide (BPO) as an initiator, and add an amount of 0.1% of the total amount of raw materials. ~0.3%, obtained by melting and grafting on a twin-screw extruder. When extruding through the extruder, the temperature of each section of the screw barrel is: the temperature in the first temperature zone is 170-175°C; the temperature in the second temperature zone is 180- 185°C; the temperature in the third temperature zone is 190-195°C; the temperature in the fourth temperature zone is 195-200°C; the temperature of the machine head is 190-200°C; the speed of the main engine: 30-40 rpm.

[0042] ...

Embodiment 6～10

[0055] Embodiment 6~10: the preparation of anti-stress cracking agent

[0056] The raw materials were weighed according to the ratio in Table 3, and the anti-stress cracking agent was prepared.

[0057] table 3:

[0058]

[0059] The preparation method of Examples 6-10 is: mix maleic anhydride, styrene, and hydrogenated SBS uniformly in proportion, use dibenzoyl peroxide (BPO) as the initiator, and add 0.1-0.3% of the total amount of raw materials , prepared by melting and grafting on a twin-screw extruder, when extruding through the extruder, the temperature of each partition of the screw barrel is: the temperature in the first temperature zone is 170-175°C; the temperature in the second temperature zone is 180-185°C; The temperature in the third temperature zone is 190-195°C; the temperature in the fourth temperature zone is 195-200°C; the temperature of the machine head is 190-200°C; the speed of the main engine: 30-40 rpm.

[0060] Table 4 is the grafting rati...

Embodiment 11～18

[0064] Examples 11-18: Preparation of stress cracking resistant PC

[0065] Table 5 is the percentage by weight of the components of the stress-cracking PCs of Examples 11 to 18, wherein the stress-cracking agent is the LLDPE grafted with maleic anhydride and styrene prepared in Example 2, and the one prepared in Example 7. One or both of maleic anhydride and styrene-grafted maleic anhydride-grafted SEBS.

[0066] table 5:

[0067]

[0068] The preparation method is:

[0069] The anti-stress cracking agent is fully mixed with PC resin under high-speed stirring, and then melted, kneaded, extruded, cooled, dried, pelletized and packaged through a twin-screw extruder; The temperature is: the temperature in the first temperature zone is 260-275°C; the temperature in the second temperature zone is 265-280°C; the temperature in the third temperature zone is 270-280°C; the temperature in the fourth temperature zone is 275-285°C; 275-290°C; host speed: 30-40 rpm.

[0070] The s...

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Abstract

The invention relates to an anti-stress cracking agent as well as anti-stress PC (Poly Carbonate). The anti-stress cracking agent is linear low-density polyethylene grafted by maleic anhydride and styrene or hydrogenated SBS (Styrene Butadiene Styrene) grafted by the maleic anhydride and styrene. The mass ratio of the maleic anhydride to the styrene to the linear low-density polyethylene in the linear low-density polyethylene grafted by the maleic anhydride and styrene is (1-5):(1-5):(50-100); the mass ratio of the maleic anhydride to the styrene to the hydrogenated SBS in the hydrogenated SBS grafted by the maleic anhydride and the styrene is (1-5):(1-5):(50-100). The anti-stress cracking agent disclosed by the invention is a composition of the linear low-density polyethylene grafted by the maleic anhydride and the styrene and the hydrogenated SBS) grafted by the maleic anhydride and the styrene in a weight ratio of (1-3):(1-2). Being detected by an anti-stress test, the anti-stress PC disclosed by the invention has good anti-stress cracking performance.

Description

technical field [0001] The invention relates to the field of materials, in particular to an anti-stress cracking agent, its preparation method and application, and an anti-stress-cracking PC polyester. Background technique [0002] Polycarbonate (PC) is an amorphous thermoplastic engineering plastic, which has the advantages of high impact strength, creep resistance, good dimensional stability, heat resistance, transparency, and excellent dielectric properties. However, PC is very prone to stress cracking. shortcoming. This is mainly because the molecular chains of PC are forced to be oriented during injection molding. Since the molecular chains of PC contain a large number of benzene rings and have high rigidity, it is difficult to de-orientate; and after molding, the oriented chains are restored to nature. The slow trend of the state, the entire molecular chain has been frozen and the interaction between the macromolecular chains, resulting in residual stress in the workp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02C08F287/00C08F222/08C08L51/06C08L51/00C08L69/00C08L55/02B29B9/06B29C47/92B29C48/92
CPCB29C48/04B29C48/40B29C48/875B29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895B29C2948/92904
Inventor 贺芳孙兆懿孟征钱晶郭新利黄兴宇
Owner 北京航天凯恩新材料有限公司
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