JPS6077599A - Frame for electroacoustic transducer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a frame used in an electrical II converter.

(Prior Art) Conventionally, for this type of speaker frame, gold R+A material of aluminum material, for example, has been mainly used. The frame made of this metal material is generally heavy and has a high elastic modulus, so it has an unfavorable effect on the frequency characteristics of the speaker. In addition, a frame made of synthetic resin was inferior in terms of internal loss.

(Object of the Invention) The present invention was proposed in order to improve the above-mentioned drawbacks, and is a frame for a speaker that is lightweight, has excellent mechanical strength, and does not adversely affect the frequency characteristics of the speaker. The purpose is to provide

(Structure of the Invention) In order to achieve the above object, the present invention provides a propylene-based polymer, an organic compound having at least one unsaturated bond and a hydroxyl group, an organic peroxide, and a carbon fiber. It is a molded product obtained by treating a mixture consisting of Graphai 1 to 1 and an inorganic filler such as mica at 120 to 140C, and the proportion is based on 100 parts by weight of the joint of the propylene polymer and the inorganic filler. The mixing ratio is 0.1 to 50 parts by weight of the organic compound, 0.01 to 20 parts by weight of the organic peroxide, and 0.01 to 20 parts by weight of the organic compound and the propylene polymer and inorganic filler. Mixture B1 - Mixing of inorganic fillers in the mixture 1.
Electricity 6 characterized in that 1 go is 10 to 80%
The gist of the invention is a frame for a cost converter.

Next, the present invention will be explained in detail. The embodiments are merely illustrative, and it goes without saying that various changes and improvements may be made without departing from the spirit of the present invention.

As mentioned above, the frame for a speaker needs to have a low % F, excellent one-band strength, and have no adverse effect on the frequency characteristics of the speaker. The present inventors investigated the above-mentioned questions and found that (^) Propylene polymer (B) is an organic compound having at least one unsaturated bond in the molecule and containing a hydroxyl group (hereinafter referred to as [hydroxyl group)]. Compound J) (composed of (i) organic peroxide and (0) inorganic filler such as carbon fiber, graphite and mica, the mixing ratio of which is the total amount of the propylene polymer and inorganic filler) 100 parts by weight, the hydroxyl compound is 0.1 to 50 parts by weight, the organic peroxide is 0.01 to 20 parts by weight, and the propylene polymer and inorganic filler are It has been discovered that a frame in which the mixing proportion of the inorganic filler in the total amount of is 10 to 80% by weight satisfies the above points.

Next, materials used in the present invention will be explained.

(A) Propylene-based polymer The propylene-based polymer used in the present invention includes a propylene homopolymer, a random or block copolymer of propylene and ethylene, and zo[]pyrene having at most 12 carbon atoms. Examples include random or block copolymers with other α-olefins. Any random copolymer and block Jl [if a copolymer is used, the comonomer copolymerization ratio of a certain 1 dylene and the above-mentioned other α-olefins is between 20 and 1 as the sum of them.
! I% or less is preferable. The propylene polymer has a mel flow index (according to JIS K-6758, measured at a hot water temperature of 230°C and a load of 2.16 degrees, hereinafter referred to as 'Mrl') of 0.01 to 10.
0 o/10 min is preferred, especially 0.0 o/10 min. Old ~80
A value of 0/10 minutes is suitable. Mrl is 0,0OII
J/If a propylene polymer that has not been vortexed for 10 minutes is used, not only will the moldability of the resulting composition be poor, but it will also be difficult to obtain a uniform composition due to the poor melt-kneading properties described below. becomes. On the other hand, if a propylene-based polymer with a ratio exceeding 100 (J/10 minutes) is used, the melt-mixing property and moldability are excellent, but the mechanical properties of the resulting speaker diaphragm are not J:<<.

These propylene-based polymers are produced by homopolymerizing propylene using a catalyst system (so-called Daegler catalyst) consisting of a transition metal compound and an organoaluminum compound, or by polymerizing propylene with ethylene and/or the above α-olefin in a random or block manner. They are obtained by copolymerization, and their manufacturing method and physical properties are well known.

(B) Hydroxyl compound The hydroxyl compound used in the present invention has at least one unsaturated bond (double bond, triple bond),
and is a compound containing a hydroxyl group. Typical examples include alcohols with double bonds, alcohols with triple bonds on the right, esters of -valent or divalent unsaturated carboxylic acids and unsubstituted dihydric alcohols, and unsaturated carboxylic acids and unsubstituted dihydric alcohols. Examples include esters with substituted trihydric alcohols, esters with unsubstituted tetrahydric alcohols, and esters with unsubstituted trihydric or higher alcohols.

Preferred representative examples of alcohols having a double bond are those whose general formula is represented by the following formula [Formula (I)].

In formula (1), R1 and R2 may be the same or different, and are a hydrogen atom or a hydrocarbon group having 1 to 24 carbon atoms.

A typical example of a preferable alcohol having a trim bond is one whose general formula is represented by the following formula ((TI) formula) y W.

In the formula (R'-CmiC-R'-)OH(II)(II), R3 and R4 may be the same or different, and are a hydrogen atom or a hydrocarbon group having 1 to 24 carbon atoms.

In addition, a disprue of an unsubstituted dihydric alcohol and an unsaturated carboxylic acid is an ester of a monovalent unsaturated carboxylic acid and an unsubstituted dihydric alcohol, and as a representative example of a preferable one, its general formula is as shown below. (<III) formula).

0-R″-OH In the formula (IH), R% is an unsaturated hydrocarbon group having 2 to 24 carbon atoms, and R@ is a hydrocarbon group having 2 to 24 carbon atoms.

Furthermore, non-WIP! ! The ester of a trihydric alcohol and an unsaturated carboxylic acid is an ester of a monovalent unsaturated carboxylic acid and an unsubstituted trihydric alcohol, and as a representative example of a desirable one, the general formula is the following formula ((■) formula) It is expressed as

(In formula IVI, R' is an unsaturated hydrocarbon group having 2 to 24 carbon atoms, and R1 is a hydrocarbon group having 2 to 24 carbon atoms.

Further, the ester of an unsubstituted tetrahydric alcohol and an unsaturated carboxylic acid is an ester of a monovalent unsaturated carboxylic acid and a non-purchased tetrahydric alcohol, and a representative example of a preferable one has the general formula (( V) Formula).

(In the Vl formula, R1 is an unsaturated hydrocarbon group having 2 to 24 carbon atoms, and RIo is a hydrocarbon M group having 2 to 24 carbon atoms.

Additionally, unsubstituted alcohols and unsaturated carboxylic acid esters are monovalent unsaturated carboxylic acids and IP 1i
lv model 1i 1i! li JJ, Nisdel with the above alcohol, and a desirable representative example is one whose general formula is represented by the following formula [formula (■)].

RlI C(Vl) \OR"-(OH)n (■1) In the formula, n is 4 or more, and R11 is carbon S
; the number is 2 to 24 unsaturated hydrocarbon groups, RI2
is a hydrocarbon group having 2 to 60 carbon atoms.

Moreover, other esters include unsaturated 21-carboxylic and non-Ff1! I! There are esters with polyhydric alcohols, and a typical preferred example is one whose general formula is represented by the following formula [formula (■)].

1 (■), m is 1 or more, R13 is an unsaturated hydrocarbon group having 2 to 50 carbon atoms, and R)l is a hydrocarbon group having 2 to 100 carbon atoms.

Typical examples of these hydroxyl compounds include "Handbook of Existing Chemical Substances" (Kagaku Kogyo Nippo, published in 1978), supervised by the Chemical Safety Division, M Basic Industries Bureau, Ministry of International Trade and Industry, 2nd edition;
It is described on pages 25, 27 to 28, pages 50 to 55, and pages 57 to 58.

Among the hydroxyl compounds used in the present invention,
Representative examples of suitable ones include 3-hydroxy-1-
Propene, 4-hydroxy-1-butene, cis-4-
Hydroxy-2-butene, trans-4-human Oxy-2-butene, 3-hydroxy-2-methyl-1-butene
Ben, cis-5-hydroxy-2-pentene, trans-5-human Oxy-2-pentene, cis-1゜4-
Dihydroxy-2-butene, trans-1,4-dihydroxy-2-butene, 2-hydroxyethyl hook relay i・, 2-hydroxyethyl methacrylate-1・
, 3-hydroxypropyl acrylate-1, 3-hydroxypropyl methacrylate! ~, 2-hydroxyethyl crotone 1-12.3, 4.5.6-pentahydroxyhexyl acrylate, 2.3゜4.5.6-pentahydroxyhexyl methacrylate-1., 2.3,
Examples include 4.5-tetrahydroxypempuruacryle-1. and 2.3.4.5-tetrahydroxypempuruacryle-1.

(C) Organic peroxide Furthermore, the organic peroxide used in the present invention is generally used as an initiator in radical polymerization and a crosslinking agent for polymers, and has a half-life of 1 minute.
The temperature is preferably 130'C or higher, particularly 130'C or higher. If the temperature is 100'Cj, it is not only difficult to handle, but also the effect of using it is not very noticeable, so it is not desirable. Representative examples of preferred organic peroxides include ketone peroxides such as 1.1-bis-tertiary-butylperoxy-3,3,5-trimepylcyclohekiline, and dialkyl peroxides such as diacyl peroxide. , hydroperoxides such as 2,5-dimethylbexane-2,5-hydroperoxide, diacyl peroxides such as benzoyl peroxide, and 2°5-dimethyl-2,
Examples include peroxy esters such as 5-dibenzoyl peroxyhexane.

(b) Inorganic filler The inorganic filler used in the present invention includes carbon fiber, graphite, mica, etc., but is not limited thereto.

The carbon 1@It is obtained by carbonizing petroleum bits or polyacrylonitrile as a raw material. The density is generally about 1.8 g/cmj. Further, the average fiber diameter is usually 3 to 15 microns, and the average tlAm length is o, i-1-1o.

In particular, it is desirable that the average fiber diameter is 3 to 12 microns and the average fiber length is 0.2 to (illllllll).

Furthermore, the elastic modulus of this carbon fiber is generally 15 to 75.
1-ton/mm', especially 20-60 tons/ll1m
2 is preferred. Furthermore, in the present invention, in order to easily avoid processing during mixing, it is possible to use a material that has been bundled using a binding agent such as polyvinyl acetate.

Graphite is generally naturally produced, and flaky graphite is particularly preferred. Usually black or lead black. Its average particle size is 0.2 to 5 microns [1 micron]. In particular, those with a diameter of 0.5 to 20 microns are desirable. Furthermore, those having an aspect ratio (diameter/n) of 3 to 50 are suitable. This graph eye] is usually 6.5~
It contains 91% fixed carbon.

Further, the mica used as an inorganic filler in the present invention is a naturally occurring plate-shaped mineral, and although its composition is ttt mixed, it is mainly composed of muscovite, phlogopite, and black cloud. The average particle size is usually 1 to 100 microns, preferably 1 to 50 microns, especially 2
~50 microns are preferred. Using mica with a particle size of less than 1 micron to produce compositions reduces the stiffness of the resulting composition. On the other hand, if a composition is manufactured using mica with a diameter exceeding 100 microns, the mica in the molded article is likely to peel off and weld lines will be noticeable, both of which are unfavorable. Further, the aspect ratio is generally 10 to 100, preferably 10 to 10, and particularly preferably 20 to 70. If a composition is made using mica with an aspect ratio of less than 10, the stiffness of the resulting composition will be reduced. On the other hand, when molding is performed using a material exceeding 100, the mica in the resulting molded product (speaker diaphragm) tends to peel off and weld lines become noticeable, both of which are undesirable.

(E) Composition ratio In producing the composition of the present invention, the blending ratio of the hydroxyl compound is 0.1 to 50 parts by weight based on 100 parts by weight of the propylene polymer and inorganic filler. .2 to 30 heavy hanging parts are preferred, especially 0.3 to 20
Shigekawabe is suitable. Also, the above-mentioned white dew 1 hanging 100mff1
．． The ratio of hydroxyl compound kj to parts is 0.
If the thickness is less than 1 mm, the effect of improving adhesion will be less than -1 minute. On the other hand, if 50 parts by weight or more of C is used, no effect of improving adhesion is observed depending on the amount used, and the original properties (particularly mechanical strength) of the propylene polymer are impaired, so it is preferable. do not have.

Further, the blending ratio of the organic peroxide to the above-mentioned total ff1100 parts by weight is 0.01 to 20 parts by weight, and 0.0 parts by weight.
5 to 10 m parts are desirable, and 0.1 to 1 m parts are particularly suitable. The blending ratio of the above organic peroxide is 0
．． If the amount is less than one layer, not only the effect of improving adhesion is low, but also the durability of the adhesion strength of the composition is reduced. On the other hand, 2
If the molecular weight exceeds 0, the inherent mechanical properties of the polymer will deteriorate, so it is undesirable in any case.

In the present invention, the composition ratio of these inorganic fillers in the propylene polymer and the inorganic optical 1n agent is 10 to 80 parts by weight, with the combined fillft being 100.
It is preferably 10 to 60 parts by weight, particularly preferably 10 to 50 parts by weight. If the composition ratio of the inorganic filler is less than 10 parts by weight, the effect of improving the stiffness of the resulting composition is poor. on the other hand,
If these inorganic fillers are mixed in an amount exceeding 80 parts, the moldability of the molded product will be poor, and even if a molded product can be manufactured, the appearance of the speaker diaphragm will not be good. .

In the composition of the present invention, the blending ratio of the FM element IA cloth, graphite, and mica in the total amount is arbitrary and is not particularly limited.

(F) Production of composition To produce the composition of the present invention, a propylene polymer,
What is necessary is to uniformly mix the human oxygen compound, the organic peroxide, and the above-mentioned inorganic filler so that the composition ratio is within the above-mentioned range. In producing this composition, a propylene polymer, a hydroxyl compound, and an organic peroxide are melt-kneaded in advance by the method described below to produce a treated product (graft product), and the treated product and inorganic filler It can be manufactured by uniformly mixing. Furthermore, a composition in which the graft product and the inorganic filler Ii are uniform may be produced by melt-kneading all the composition components.

Alternatively, a so-called masterbatch may be produced by mixing some of the composition components in advance, and this masterbatch and the remaining composition components may be produced to produce a composition so as to have the above-mentioned composition ratio.

Further, the composition may be composed of a propylene polymer, a hydroxyl compound, an organic peroxide, and the above-mentioned inorganic filler, but depending on the purpose of use of the composition, oxygen, heat, and stabilizer against ultraviolet light,
Additives such as metal deterioration inhibitors, flame retardants, colorants, electrical property modifiers, antistatic agents, lubricants, processability modifiers and tack modifiers may be added to impart the properties possessed by the compositions of the present invention. They may be mixed as long as they do not grow.

The composition obtained by the method described above is usually shaped into a shape, and the m! Used for manufacturing equipment converter flask l-. The frame for the hexagastric device transducer is manufactured by an injection molding method commonly used in the field of thermoplastic resin molding. In the case of injection molding, if carried out at high temperatures, the resin may deteriorate;
C1 Preferably, the temperature range is 180 to 250°C.

(Examples and Comparative Examples) Next, the present invention will be explained in more detail with reference to Examples.

It should be noted that the embodiments are merely illustrative, and it goes without saying that various changes and improvements may be made without departing from the spirit of the present invention.

In addition, in the examples and comparative examples, the tensile strong acid is AST
Measured according to MD-638. The flexural modulus was measured using 8 STM 11-790 and 1 cm.

Furthermore, density was measured according to JTS K-6758. In addition, the adhesive strength was determined according to JIS K-6854 (test method for peeling adhesive strength of bamboo grafting agents), and the test samples were as follows: various resins of Examples and Comparative Examples and No. 9 canvas A7 canvas.
The 0 degree dissection strength was measured. , the size of the piece is +1125m
m, and the adhesive application area is 25IllIll x 7511I
IIl, using urethane adhesive as the adhesive,
After adhesion, the tensile test method was left at room temperature for 48 hours. Using a tensile test rock, the tensile speed was 50+u/min, and the peel angle was 180 degrees.
Adhesive peel strength data (in g/25 °C)
mm). Furthermore, the speaker characteristics could be determined by adjusting the frequency characteristics in an anechoic chamber.

The physical properties of the pyrene polymer, hydroxyl compound, organic peroxide, carbon fiber, graphite, and mica used in the Examples and Comparative Examples are shown below.

[Propylene polymer]

As a propylene polymer, the density is 0.900g/cm'
and Mrl is 4. A propylene homopolymer (hereinafter referred to as FPP (8)) with a molecular weight of 12.0 g/10 min and an ethylene-containing nff1 of 12.0 g/10 min, i'J, lr tsu M
A 10 pyrene-ethylene block copolymer (hereinafter referred to as PP(B)) having a temperature of 1.0 g/10 minutes was used.

(Carbon t'A strip) PM fiber with an average fiber diameter of 7 microns and an average thread length of 7μm (manufactured by Toho Rayon Co., Ltd.)
was used.

(Graphite) Graphite scaly graphite (aspect ratio 30) with an average particle size of 10 microns when closed was used.

[Mica]

Mica having an average particle diameter of 7 microns (aspect ratio 30) was used as the mica.

[Hydroxyl compound]

As a hydroxyl compound, 2-human Q, 4 diethyl acrylate [hereinafter referred to as compound (8)], and 2
-Hydroxypropyl methacrylate-1 [The following compound (
B) and five] were used.

[Organic peroxide]

As an organic peroxide, penzoyl peroxylate [hereinafter 1
1PO] and dicumyl bicarbonate (hereinafter referred to as CP) were used.

(Example Month ~ 3. (Comparative Examples) 1 ~ 3 The ingredients shown in Table 1 were mixed in advance for 10 minutes (tri-blend) using Super Mix → No. Each of the resulting mixtures A pellet-like product was produced by melt-kneading the pellets using an extruder with a vent.The resulting pellet was molded into a speaker frame with a diameter of 15 ml using an injection molding machine with a mold clamping pressure of 125 hours at a resin temperature of 210°C. The resulting frame was measured for density and Young's modulus (flexural modulus). The results are shown in Table 1.

J, Use urethane adhesive to fix the damaged frame, T.
The adhesive strength was measured. Those results
It is shown in Table 1.

<La brightness effect) Although the conventional all-island frame has high mechanical strength, it has low internal loss, so it is not suitable as a speaker frame. In addition, frames using conventional olefin compositions have internal loss, but cannot be directly bonded to the diaphragm. However, according to the present invention, the internal loss is low, the contact with the diaphragm is good, and furthermore, the structure is at the edge of the eaves, the mechanical strength is on par with the average, and the bending strength is high, and the bending strength is high. This proves its excellent effectiveness as a frame for a fighting instrument.

It should be noted that the above embodiments are not limited to speaker frames, but it goes without saying that they can also be used for personal computers, 90 phones, receivers, and the like.

Patent applicant Foster WIII Co., Ltd.-J-=
Continuation rlJ ,,jtE u'3 (way i 11r4 sum r50i December 7 (1 Bamboo permit office good official Kazuo Wakasugi 111jj '1. Display of incident Person who corrects frame 34 for electric sound front converter Tenancy and σ Monthly ν1 Section Patent Applicant Name Nooster Denki 11, Shikikai So 4, Agent 160 Address Width 9 Miyako Kashuku 19. Nishifli Shuku 7J 10-1;
August light I11! i! January 11th, 1999 (Showa era!
I! January 1 year; unchanged to month = 1).

Claims (1)

[Claims] A mixture consisting of a propylene polymer, an organic compound containing at least one unsaturated bond and a hydroxyl group, an organic peroxide, and an inorganic filler such as carbon fiber, graphite, and mica. This is a molded product obtained by processing in "C", and the mixing ratio of the propylene polymer and the inorganic filler to 100 parts by weight of the total amount of the organic compound is 0.1 to 50 parts by weight. parts, and the organic peroxide is 0.9 parts.
01 to 20 parts, and the proportion of the inorganic filler in the mixture of the propylene polymer and the inorganic filler is 10 to 80 mm%. Dexterity frame.