Halogen-free flame-retardant PC / ABS alloy

Abstract

The halogen-free flame-retardant PC / ABS alloy comprises PC resin, ABS resin, a flexibilizer, an antioxidant, a halogen-free flame retardant, a lubricant, a char forming accelerant and a dripping agent, and the dripping agent accounts for 0.03%-0.2% of the total weight of the PC resin, the ABS resin, the flexibilizer, the antioxidant, the halogen-free flame retardant, the lubricant, the char forming accelerant and the dripping agent. By adding the charring accelerant and a small amount of dripping agent, the halogen-free flame-retardant PC / ABS alloy not only can meet the flame retardant test of 1.6 mmV-0, but also can meet the needle flame test standard of GB4943.1-2022.

Description

Technical Field

[0001] The invention relates to the technical field of modified PC / ABS alloys, in particular to a halogen-free flame-retardant PC / ABS alloy. Background Art

[0002] PC / ABS alloy is an excellent engineering plastic made by melt blending PC resin and ABS resin. It has the advantages of both PC and ABS in performance, making up for the defects of a single material, and greatly improving the comprehensive performance of the alloy material. Compared with ABS, it has improved mechanical properties such as high temperature resistance, impact strength and tensile strength; compared with PC, the melt viscosity, molding processability, paintability and melt fluidity of the blended alloy have been greatly improved. At the same time, due to the significant reduction in product costs due to the addition of ABS, it has developed rapidly in recent years and has been widely used in many fields such as automotive parts, electronic appliances, communication equipment, lighting equipment, office equipment, packaging materials, etc.

[0003] Phosphate flame retardant is a highly efficient flame retardant for PC / ABS alloys. Its mechanism of action is to decompose under heat at the initial stage of combustion to form a dense carbon layer with the flame retardant to isolate oxygen and heat and block the occurrence of combustion. The higher the amount of flame retardant added, the better the flame retardant effect. However, the flame retardant has been used for products in industries such as audio and communications. On July 19, 2022, the mandatory national standard GB4943.1-2022 "Audio and video, information technology and communication technology equipment Part 1: Safety requirements" was officially promulgated, fully replacing the requirements of GB4943.1-2011 and GB8898-2011. The changes in material flame retardancy have added extremely stringent needle flame test requirements. The existing mature halogen-free flame-retardant PC / ABS alloy materials on the market cannot meet the flame retardant performance requirements of 1.6mmV-0 while meeting the needle flame test requirements. The main manifestation is that the vertical combustion test causes dripping or the needle flame combustion causes perforation and failure. The existing halogen-free flame-retardant PC / ABS alloy materials on the market usually fail in one of these two forms. The contradiction between the two test requirements is that in order to ensure the 1.6mmV-0 vertical combustion level, it is usually necessary to increase the anti-drip agent content to avoid dripping combustion problems during the combustion process and cause failure. However, excessive anti-drip agent content during needle flame combustion will cause the melt strength of the material to decrease after heating, and the anti-drip agent will shrink. When shrinking, it will pull the melt apart and break it, causing the part to crack and fail.

[0004] Therefore, in order to meet the 1.6mmV-0 flame retardant and GB4943.1-2022 needle flame test standards, the halogen-free flame retardant PC / ABS material needs to be further optimized and modified. Summary of the invention

[0005] In order to solve the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a halogen-free flame retardant PC / ABS alloy, which can meet both the 1.6mmV-0 flame retardant test and the GB4943.1-2022 needle flame test standard.

[0006] In order to achieve the above object, the present invention designs a halogen-free flame-retardant PC / ABS alloy, which includes PC resin, ABS resin, toughening agent, antioxidant, halogen-free flame retardant, lubricant, carbonization accelerator and dripping agent, and the dripping agent accounts for 0.03% to 0.15% of the total weight.

[0007] Preferably, PC resin 65-80 weight parts, ABS resin 5-15 weight parts, toughening agent 3-5 weight parts, antioxidant 0.2-1 weight part, lubricant 0.5-2 weight parts, halogen-free flame retardant 5-15 weight parts, charring accelerator 1-5 weight parts, dripping agent 0.05-0.15 weight part.

[0008] Preferably, the weight of the char-forming accelerator is one fifth to one third of the weight of the halogen-free flame retardant.

[0009] Preferably, the dripping agent is 0.1 parts by weight.

[0010] Preferably, the halogen-free flame retardant is 8 to 15 parts by weight.

[0011] Preferably, the charring accelerator is a triazine charring accelerator.

[0012] Preferably, the dripping agent is SA8.

[0013] Preferably, the halogen-free flame retardant is a phosphate flame retardant.

[0014] Preferably, the antioxidant is a mixture of the antioxidant 1010 and the antioxidant 168, and the antioxidant 1010 and the antioxidant 168 are generally mixed in a ratio of 1:1.

[0015] Preferably, the toughening agent is a silicon-based toughening agent.

[0016] Compared with the prior art, the beneficial effect of the present invention is that by adding a carbonization accelerator and a small amount of dripping agent, the halogen-free flame retardant PC / ABS alloy can meet both the 1.6mmV-0 flame retardancy test and the GB4943.1-2022 needle flame test standard.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. DETAILED DESCRIPTION

[0018] Here, exemplary embodiments are described in detail. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are only examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0019] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" and "the" used in the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0020] It should be understood that although the terms first, second, third, etc. may be used in the present invention to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0021] The present invention is described in detail below. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0022] The present application discloses a halogen-free flame-retardant PC / ABS alloy, which comprises PC resin, ABS resin, a toughening agent, an antioxidant, a halogen-free flame retardant, a lubricant, a carbonization accelerator and a dripping agent.

[0023] PC resin is a tough thermoplastic resin, and its name comes from the -OC(=0)-O- group inside it. In this embodiment, PC resin includes two types, one type is 02-10, and the other type is 02-20. The difference between the two types is the different melt index. The melt index of type 02-10 is 10g / 10min, and the melt index of type 02-20 is 20g / 10min, so as to improve the flowability of the material.

[0024] In this embodiment, the weight ratio of the PC resin of model 02-10 is greater than that of the PC resin of model 02-20.

[0025] The dripping agent accounts for 0.03% to 0.15% of the total weight, preferably 0.03% to 0.1% of the total weight. The amount of dripping agent added should be as small as possible. Once too much is added, it is easy to burn through and cannot meet the needle flame test. Without it, vertical combustion will not pass and it is particularly easy to drip during combustion.

[0026] The charring accelerator accelerates the charring of PC resin during combustion to prevent the spread of combustion. It is matched with the halogen-free flame retardant. The weight of the charring accelerator is generally one-fifth to one-third of the weight of the halogen-free flame retardant.

[0027] Specifically, 65-80 parts by weight of PC resin, 5-15 parts by weight of ABS resin, 3-5 parts by weight of toughening agent, 0.2-1 parts by weight of antioxidant, 0.5-2 parts by weight of lubricant, 5-15 parts by weight of halogen-free flame retardant, 1-5 parts by weight of charring accelerator, 0.05-0.15 parts by weight of dripping agent, wherein the dripping agent is preferably 0.1 parts by weight, and the halogen-free flame retardant is 8-15 parts by weight.

[0028] The carbonization accelerator is a triazine carbonization accelerator. In this embodiment, the carbonization accelerator is triazine FT-760 produced by Guangdong Fantian Technology Co., Ltd.

[0029] The dripping agent is SA8. In this embodiment, the dripping agent is SN80SA8 produced by Guangzhou Entropy Innovation Materials Co., Ltd.

[0030] The halogen-free flame retardant is preferably a phosphate flame retardant, and the toughening agent is preferably a silicon-based toughening agent.

[0031] The antioxidant is preferably a mixture of antioxidant 1010 and antioxidant 168 in a 1:1 ratio.

[0032] The preparation process of the PC / ABS alloy is as follows: the above components are mixed evenly, then melted and extruded through a twin-screw extruder, and cooled to form granules. The temperature of the first zone of the twin-screw is 190°C, the temperature of the second zone is 220°C, the temperature of the third zone is 235°C, the temperature of the fourth zone is 240°C, the temperature of the fifth zone is 240°C, the temperature of the sixth zone is 240°C, the temperature of the seventh zone is 235°C, the temperature of the eighth zone is 230°C, the temperature of the die head is 220°C, the vacuum degree is -0.06Mpa, and the main engine speed is 500 rpm.

[0033] The applicant conducted a large number of performance tests on the PC / ABS alloy material, and selected some of the tests, see Table 1 and Table 2.

[0034] Table 1 Group distribution ratio table

[0035]

[0036] Table 2 Performance test table

[0037]

[0038] It can be seen from Tables 1 and 2 that when no charring accelerator is added, no matter how much the dripping agent is added, the needle flame test cannot be passed, referring to Comparative Examples 1 and 2. When both the charring accelerator and the dripping agent are added, and the weight of the dripping agent exceeds 0.15% of the total weight, the needle flame test still cannot be passed, referring to Comparative Example 3. Only when both the charring accelerator and the dripping agent with a weight percentage of 0.03% to 0.15% are added, the halogen-free flame retardant PC / ABS alloy can meet both the 1.6mmV-0 flame retardant test and the GB4943.1-2022 needle flame test standard, referring to Examples 1 and 2.

[0039] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A halogen-free flame-retardant PC / ABS alloy, comprising PC resin, ABS resin, a toughening agent, an antioxidant, a halogen-free flame retardant and a lubricant, characterized in that: The invention also comprises a carbonization accelerator and a dripping agent, wherein the dripping agent accounts for 0.03% to 0.15% of the total weight.

2. The halogen-free flame-retardant PC / ABS alloy according to claim 1, characterized in that: The PC resin is 65 to 80 parts by weight, the ABS resin is 5 to 15 parts by weight, the toughening agent is 3 to 5 parts by weight, the antioxidant is 0.2 to 1 part by weight, the lubricant is 0.5 to 2 parts by weight, the halogen-free flame retardant is 5 to 15 parts by weight, the charring accelerator is 1 to 5 parts by weight, and the dripping agent is 0.05 to 0.15 parts by weight.

3. The halogen-free flame-retardant PC / ABS alloy according to claim 2, characterized in that: The weight of the char-forming accelerator is one fifth to one third of the weight of the halogen-free flame retardant.

4. The halogen-free flame-retardant PC / ABS alloy according to claim 2, characterized in that: The dripping agent is 0.1 parts by weight.

5. The halogen-free flame-retardant PC / ABS alloy according to claim 2, characterized in that: The halogen-free flame retardant is 8 to 15 parts by weight.

6. The halogen-free flame-retardant PC / ABS alloy according to any one of claims 1 to 5, characterized in that: The carbonization accelerator is a triazine carbonization accelerator.

7. The halogen-free flame-retardant PC / ABS alloy according to any one of claims 1 to 5, characterized in that: The dripping agent is SA8.

8. The halogen-free flame-retardant PC / ABS alloy according to any one of claims 1 to 5, characterized in that: The halogen-free flame retardant is a phosphate flame retardant.

9. The halogen-free flame-retardant PC / ABS alloy according to any one of claims 1 to 5, characterized in that: The antioxidant is a mixture of antioxidant 1010 and antioxidant 168.

10. The halogen-free flame-retardant PC / ABS alloy according to claims 1 to 5, characterized in that: The toughening agent is a silicon-based toughening agent.

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