Flame retardant compositions for flammable plastics and flame retarded plastic compositions containing the same

A technology of flame retardant composition and flame retardant plastic, applied in the field of flame retardant composition, can solve problems such as not being universal, and achieve the effect of alleviating environmental concerns

Active Publication Date: 2006-03-08
DAI ICHI KOGYO SEIYAKU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these existing methods are not universal in terms of available polymers and / or brominated flame retardants, and require relatively large amounts of free radical generators in order to obtain the desired degree of flame retardancy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～20 and comparative example 1～19

[0093] 1. Preparation of test samples

[0094] According to the formulations shown in Tables 1-5, the various materials were blended and extruded with a twin-screw extruder to prepare pellets. The pellets were then injection molded into test specimens of predetermined size. The heating cylinder temperatures of the extruder and injection molding machine were set at the following temperatures.

[0095] plastic material

[0096] 2. Flame retardancy test

[0097] In Examples 1 to 16 and Comparative Examples 1 to 15, the vertical burning method according to the UL-94 standard was adopted. The size of the test sample is 125 mm in length, 12.5 mm in width and 3.2 mm in thickness. NR stands for Not Rated.

[0098] In Examples 17 to 20 and Comparative Examples 16 to 18, the oxygen index (LOI) was measured according to the JIS K 7201 standard test.

[0099] 3. Flexural strength

[0100] Flexural stress was determined according to ASTM-D 790.

[0101] 4. Evaluation aft...

Embodiment 21～26 and comparative example 20～23

[0114] 1. Preparation of foam samples

[0115] According to the formulation shown in Tables 7-8, each material except the blowing agent was loaded into a two-stage tandem extruder. The materials were heated and blended in a primary extruder with an inner diameter of 65 mm, and then extruded into a secondary extruder with an inner diameter of 90 mm. A predetermined amount of blowing agent is injected into the extrudate under pressure through a separate line located at the front end of the primary extruder. The extrudate from the primary extruder was cooled to 120° C. in the secondary extruder and extruded through a die into a ribbon having a width of 45 mm and a thickness of 2.5 mm.

[0116] 2. Visual evaluation of foam extrudates

[0117] The state of the obtained extrudate was visually evaluated according to the following criteria.

[0118] Good: A foam extrudate without cracks or voids was stably obtained.

[0119] Bad: The foam extrudate contains many cracks or voids, o...

Embodiment 27～30 and comparative example 24～26

[0131] 1. Preparation of test samples

[0132] According to the formulation shown in Table 9, all additives were mixed with the phenolic resin varnish. A sheet of kraft paper was impregnated with the resulting mixture and dried to prepare a prepreg. Then put 8 sheets of prepreg at 150kgf / cm in a hot press 2 Lamination was carried out under pressure at 150°C for 1 hour to prepare a paper-phenolic resin laminate having a thickness of 1.6 mm.

[0133] 2. Flame retardancy test

[0134] The vertical burning method according to the UL-95 standard was performed using a test sample 125 mm long, 12.5 mm wide and 3.2 mm thick. The results are shown in Table 9.

[0135] Recipe (number of servings) and test results

[0136] As shown in Table 9, the laminates of Examples 27-30 exhibited improved flame retardancy over the laminates of Comparative Examples 24-26.

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PUM

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Abstract

A flame retardant composition for rendering flammable plastics flame retardant is provided. The composition comprises a brominated flame retardant, a free-radical generator selected from 2,3-dimethyl-2,3-diphenylbutane or its homologs, and a phthalocyanine or naphthalocyanine complex with a metal of groups 7 to group 10 of the IUPAC periodic chart. The quantity of the brominated flame retardant may be saved when incorporating into flammable plastic materials in conjunct with the free-radical generator and the phathalocyanine or naphthalocyanine complex of the above type.

Description

technical field [0001] The invention relates to a flame-retardant composition for combustible plastics, and also relates to a flame-retardant plastic composition containing the flame-retardant composition. Background technique [0002] A variety of plastics or synthetic resins are used as parts or elements of many electric and electronic devices and instruments due to their advantages of high insulation, high water resistance, high plasticity, appropriate mechanical strength, and the like. They are also found in packaging materials and construction materials. However, most plastics are combustible, so flame retardancy is required in many applications for safety reasons. The degree of flame retardancy required for plastic articles has been standardized in many fields of application and has become more stringent in recent years. [0003] Conventional plastics are made flame retardant by incorporating brominated flame retardants and antimony trioxide into the plastic. But it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L25/06C08L23/00C08L77/00C08L69/00C08K5/01C08K3/00C08K5/00
CPCC08K5/0066C08K5/01C08K5/0091C08K5/02
Inventor 大西英明寺本诚
Owner DAI ICHI KOGYO SEIYAKU CO LTD
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