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Halogen-free flame retardant containing linear phenolic aldehyde and polymer material containing halogen-free flame retardant
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A kind of novolac, inorganic flame retardant technology
Inactive Publication Date: 2012-06-20
SOUTH CHINA UNIV OF TECH
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However, it is difficult to widely popularize due to the large amount of flame retardant added, poor water resistance, and narrow application range.
Phosphate esters are commonly used in organic phosphorus flame retardant systems, such as triphenyl phosphate (TPP), resorcinol diphosphate (RDP), tetrakis-2, 6-dimethylphenylresorcinol diphosphate Phenol esters (DMP-RDP), etc., all have good flame retardant effects, but their phosphorus content is low, and they tend to be volatile, easy to migrate, and easy to bloom during use, and the mechanical properties of the resulting products are poor.
In terms of phosphorus-containing epoxy, there are introductions in patents JP10279567 and US20100181696A1, but both need to add DOPO monomer, so the cost remains high, and it cannot be widely used in actual production.
In addition, the introduction of phosphorus into polymer molecules can achieve a good flame retardant effect, but there are also disadvantages such as high cost and few suitable polymers.
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Embodiment 1-7
[0034] Put a certain amount of ABS resin at 180 0 After plasticizing on the double-roller mill of C, add each raw material in turn according to the formula (Table 1), blend evenly, and place the material in the mold after mixing, at 180 0 C’s plate vulcanizer is hot-pressed for 7-10 minutes, then cold-pressed at room temperature for 10 minutes, and finally the plate is molded and used for performance testing.
[0035] Table 1 Flame-retardant ABS blending formula / (weight parts)
[0036] Comparative example 1 Comparative example 2 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Novolac: microencapsulated red phosphorus 1:1 3:2 3:2 3:2 2:3 1:1 Flame retardant percentage content / % 12 17 12 15 15 20 25 ABS 100 88 83 88 85 75 72 67 Novolac — — 6 7.2 9 9 8 12.5 Microencapsulated red phosphorus — 12 6 4.8 6 6 12 12.5 Aluminum hydroxide — — 5 — — — — — Nitrile ...
Embodiment 3
[0038] In Example 3 and Example 4, the ratio of novolac to microcapsule red phosphorus is 3:2, and when the total addition amount is 15%, the difference is that in Example 4, 10% nitrile rubber is used to replace part of the ABS. After the replacement, the impact strength of Example 4 was greatly improved, which was 3.76 times that of Example 3, but the tensile strength decreased by 13.6%, and the flame retardancy decreased from V-0 to V-1.
[0039] Examples 5 and 6 continue to increase the content of novolak and microencapsulated red phosphorus, the flame retardancy of the obtained material is further improved, and the notched impact strength of the obtained material is greatly improved after adding nitrile rubber.
[0040]
[0041] Table 2 Physical properties of flame retardant ABS
[0042] Test items Comparative example 1 Comparative example 2 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Tensile strength (MPa) 39.2 38.7 37.1 ...
Embodiment 7
[0044] Mix 6 kg of novolac with 4 parts of red phosphorus powder and 0.1 kg of magnesiumhydroxide evenly, and then add them to a twin-screw extruder with a temperature set at 150°C to extrude and granulate to obtain novolac compounded with red phosphorus. Halogen flame retardant A.
[0045] Mix 8.5 kg of ABS with 1.5 kg of the above-mentioned halogen-free flame retardant A, extrude and granulate on a twin-screw extruder at 220°C, and then inject the obtained flame-retardant ABS on an injection molding machine at 220°C to prepare samples. The properties of the obtained samples are shown in Table 3
[0046] Table 3 Example 7 sample properties
[0047] project Example 7 Tensile Strength (MPa) 38.2 Notched impact strength (KJ m -2 ) 3.8 Flame retardant (1.6mm) V-0
[0048] Table 4 Various performance test standards
[0049] project standard test Tensile Strength GB / T1040-2006 Notched impact strength GB / T1...
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Abstract
The invention relates to a halogen-free flame retardant containing linear phenolic aldehyde and a polymer material containing the halogen-free flame retardant. A small quantity of metal hydroxides can be added simultaneously for serving as synergistic flame retardants. Phosphoruspentoxide generated by the combustion of red phosphorus reacts with a phenolic hydroxyl group in the linear phenolic aldehyde, and phosphonic acid or metaphosphoric acid and the like are generated simultaneously; and the acids of the type are further used for catalyzing dehydration and char formation of phenolic resin, and are esterified with the phenolic hydroxyl group, so that an organic-inorganic hybridbarrier layer is formed. The barrier layer is used for blocking heat conduction, diffusion and permeation of oxygen and overflow of combustible matter and slowing material degradation and the like, so that combustion is stopped finally, and flame is extinguished. A flame retarding effect can be further improved by using a small quantity of hydroxides and inorganic flame retardants containing crystal water. A halogen-free flame retardant composition can be used for retarding combustion of polymers and polymer compositions. A halogen-free flame retardant system disclosed by the invention has the advantages of low cost, low toxicity, wide application and the like, and contributes to environmental protection.
Description
technical field [0001] The invention relates to a flame-retardant non-halogen flame retardant for polymers and a polymer material containing the non-halogen flame retardant. Background technique [0002] Most polymer materials are flammable, and in order to meet certain safety standards for use, they all need to be flame retardant. The traditional flame retardant material is to add a certain amount of halogen-containing flame retardant to the polymer. In the event of a fire, it will release toxic gases, carcinogens, etc. to pollute the environment, causing "secondary damage" and endangering human life and the environment. Cause lasting damage, so people began to study halogen-free flame-retardant materials with excellent ecological and environmental performance. [0003] At present, the halogen-free flame retardant is mainly based on phosphorusnitrogensystem. Among them, the intumescent flame retardant is the current research hotspot. It integrates three components of ca...
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