JPH04249550A - Encapsulated flame retardant - Google Patents

Abstract

PURPOSE:To provide a flame retardant which imparts flame retardancy to a construction material such as rubber, fiber, paper or wood when added thereto and especially an encapsulated flame retardant prepared by coating a parent particle of an inorganic flame retardant with daughter particles of a polymeric flame retardant. CONSTITUTION:A flame retardant which imparts flame retardancy to a construction material such as plastic, rubber, fiber, paper or wood when added thereto, wherein the retardant is prepared by coating a parent particle of an inorganic flame retardant such as aluminum hydroxide with daughter particles of a polymeric flame retardant so as to form a microcapsule.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to flame retardants that are blended into building materials such as plastics, rubber, fibers, paper, and wood to make them flame retardant. This invention relates to a capsule-type flame retardant coated with flame retardant child particles.

0002

[Prior art] Plastics, rubber, fibers, paper,
For safety reasons, building materials such as wood are mixed with flame retardants to make them flame retardant.

[0003] This flame retardant can be classified into an additive method and a reaction method depending on its method of use. The addition method involves adding a flame retardant to the polymer, which may change the physical properties of the plastic depending on the amount added, but has the advantage of being easy to handle. On the other hand, the reaction method involves reacting during the production of plastics, and unlike the addition method, there is no risk of changing the physical properties of the plastic, but since it involves a compound with a functional group, it tends to be difficult to produce and expensive.

[0004]Furthermore, flame retardants can be broadly classified into two types: halogen-based flame retardants, phosphorus-based flame retardants, or polymer-based flame retardants, and inorganic flame retardants.

Typical polymeric flame retardants include tetrabromobisphenol A (TBA), hexabromobenzene (HBB), and tricresyl phosphate (TC).
P), triethyl phosphate (TEP), and other polymer types. In addition, typical inorganic flame retardants include aluminum hydroxide, zirconium hydroxide,
Examples include magnesium hydroxide, red phosphorus, tin oxide, ammonium trioxide, barium metaborate, and the like.

By the way, when these flame retardants are blended into building materials, polymer flame retardants such as halogen flame retardants and phosphorus flame retardants, and inorganic flame retardants are appropriately combined and blended. In other words, if only inorganic flame retardants are used as flame retardants in building materials, the surface of the inorganic powder may not be chemically neutral due to the manufacturing process; There is a tendency for flame retardants to cause chemical reactions with the building materials to which they are blended, resulting in coloring and deterioration of physical properties of the building materials to which they are blended. on the other hand,
If only polymer-type halogen-based flame retardants or phosphorus-based flame retardants are used as flame retardants, there is a risk that the rate of smoke and toxic gas generation will increase upon ignition. Furthermore, these halogen-based flame retardants and phosphorus-based flame retardants have the disadvantage that, when exposed to ultraviolet rays, they discolor building materials, etc. in which they are blended, and also deteriorate their physical properties. Moreover, fluidity as a powder characteristic poses a handling problem.

For this reason, in JP-A-61-115942, as shown in FIG. 2, a halogen flame retardant powder a is coated with a synthetic resin b to form microcapsules, and fine particles of aluminum hydroxide are added to the synthetic resin coat b. A capsule-type flame retardant has been proposed in which the light resistance and flow characteristics of the halogen-based flame retardant powder a are improved by containing an inorganic flame retardant c such as 5 to 100 wt % based on the synthetic resin b.

[0008]

[Problem to be solved by the invention] By the way, JP-A-61
-115942 had the disadvantage that a large amount of polymer was used, resulting in a large amount of smoke and toxic gas being generated when ignited. In addition, the inorganic flame retardant (c) such as aluminum hydroxide contained in the synthetic resin (b) coating must have an extremely small particle size of submicrons to several microns, which is difficult to manufacture and therefore extremely expensive. It was something. Furthermore, there is a possibility that a considerable amount of fine particles f of metal oxides and hydroxides such as aluminum hydroxide exist on the surface of the synthetic resin b coating, and the pH of the surface of fine particles such as hydroxides changes over time. There was a possibility that the surface of the synthetic resin b coating would change color.

Therefore, the present invention was devised to effectively solve the above-mentioned problems, and its purpose is to reduce the amount of smoke and harmful gases generated by reducing the amount of polymers such as synthetic resins used. It is an object of the present invention to provide a capsule-type flame retardant that reduces the amount of heat used and does not cause disadvantages such as discoloration or deterioration of physical properties to the building materials in which it is mixed.

0010

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a flame retardant that is blended into building materials such as plastics, rubber, fibers, paper, and wood to make them flame retardant.
Mother particles of an inorganic flame retardant such as aluminum hydroxide are coated with child particles of a polymer flame retardant and are microencapsulated.

[0011]

[Function] As described above, in the present invention, the mother particles of an inorganic flame retardant are coated with child particles of a polymer flame retardant to form microcapsules, so that the amount of smoke and toxic gas generated can be reduced. Furthermore, since the polymeric flame retardant prevents the acid component or alkaline component of the inorganic flame retardant from leaching out, it is possible to prevent discoloration and deterioration of physical properties of the building materials to which it is blended. Furthermore, microencapsulation improves flow properties.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

As shown in FIG. 1, the capsule-type flame retardant 1 according to the present invention combines base particles 2 of an inorganic flame retardant such as aluminum hydroxide with a polymeric flame retardant such as a halogen flame retardant or a phosphorus flame retardant. It is coated with child particles 3 and microencapsulated.

As mentioned above, this inorganic flame retardant is aluminum hydroxide, zirconium hydroxide, magnesium hydroxide, red phosphorus, tin oxide, ammonium trioxide, barium metaborate, etc., and its particle size is 50 to 100 μm. are used.

Polymer flame retardants such as halogen flame retardants and phosphorus flame retardants include the above-mentioned tetrabromobisphenol A (TBA), hexabromobenzene (HBB), tricresyl phosphate (TCP), and triethyl phosphate (TEP). ), 2,2-bis(4-hydroxy3,5-diprophenyl)propane, tris(2,3-
dibromopropyl) isocyanurate (TAIC-6B
), 2,2bis(4-hydroxyethoxy-3,5-dibromophenyl)propane (TBA-EO), decabromodiphenyl oxide (DBDPO), halogen-containing polyphosphate, tris(β-chloroethyl)phosphate (TCEP) , trischloroethylphosphate (CLP), trisdichloropropylphosphate (C
RP), cresyl diphenyl phosphate (CDP),
There are xylenyl diphenyl phosphate (XDP), acidic phosphate esters, nitrogen-containing phosphorus compounds, etc., and the particle size is 10
μ or less is used.

Next, the operation of this embodiment will be described.

The capsule-type flame retardant 1 of the present invention is prepared by first applying a plurality of child particles of a polymeric flame retardant having a particle size of 10 μm or less around a mother particle of an inorganic flame retardant having a particle size of 50 to 100 μm, using an electrostatic method. It is manufactured by coating by deposition using CVD, PVD, sputtering, mechanical methods, etc., and by microencapsulation. By adding this capsule-type flame retardant to building materials, the materials will be made flame retardant. In this way, the capsule-type flame retardant 1 of the present invention can reduce the amount of polymer such as synthetic resin used for encapsulation, and can reduce the amount of smoke and toxic gas generated at the time of ignition. At the same time, the acid component or alkali component of the base particles of the inorganic flame retardant becomes difficult to elute to the surface of the synthetic resin coating, and it becomes possible to prevent discoloration and changes in physical properties of the building materials to which the flame retardant is blended. In addition, the inorganic flame retardant blended into the synthetic resin in the above-mentioned JP-A-61-115942 has extremely small particle sizes ranging from submicrons to several microns, so the price per ton is several million yen. On the other hand, since the inorganic flame retardant used in the present invention has a relatively large particle size of 50 to 100 microns, its price is low at several tens of thousands of yen per ton, making it excellent in terms of economy. Further, by microcapsulating the flame retardant, its flow characteristics are improved, so that a uniform formulation can be achieved.

As shown in FIG. 3, when the capsule-type flame retardant 1 of the present invention is blended into building materials used in places exposed to light such as ultraviolet rays, the above-mentioned Japanese Patent Application Laid-Open No. 61-115942 is used.
As disclosed in , light resistance can be improved by coating the child particles 3 of a polymeric flame retardant with a synthetic resin 5 blended with a particulate inorganic flame retardant 4.

[0019]

[Effects of the Invention] In summary, according to the present invention, since the amount of polymer used is small, it is possible to reduce the amount of smoke and toxic gas generated, and the building materials to which it is mixed can undergo discoloration and change in physical properties. etc. can be prevented from occurring. In addition, microcapsules have excellent effects such as improved flow characteristics and uniform quality.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an example of a conventional capsule-type flame retardant.

FIG. 3 is a schematic diagram showing another modified embodiment.

[Explanation of symbols]

1 Capsule type flame retardant 2　Mother particle 3 Child particle

Claims (1)

[Claims] Claim 1: In a flame retardant that is blended into building materials such as plastics, rubber, fibers, paper, and wood to make them flame retardant, base particles of an inorganic flame retardant such as aluminum hydroxide are combined with a polymer flame retardant. A capsule-type flame retardant characterized by being coated with child particles and encapsulated in microcapsules.