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[Object of the Invention] (Industrial field of application) The present invention relates to a
diaphragm end plate for a speaker using a sulfochlorinated polyolefin latex, the object of which is
a speaker edge portion excellent in heat resistance, weather resistance and pouring. It is to offer.
(The diaphragm edge portion of the prior art speaker is generally manufactured through a series
of steps described later so as to obtain a desired stab kiss and an air-permeable edge portion.
That is, in order to make the edge base material one step of formability when forming the edge
base material in the dyeing process, the closing process for controlling the air permeability of the
edge base material, and the diaphragm together with the diaphragm. Of the molding agent
treatment process, i & finally, through the top coat treatment for controlling the stiffness and
aeration. Materials used for the edge base material include cotton cloth, woven or non-woven
fabric of synthetic fibers, paper and the like. Moreover, synthetic resins, such as an acrylic resin,
are generally used as a filler, and phenol resin seed | species, a melamine resin, etc. are used as a
shaping | molding agent. The top coat treatment is usually performed by using a resin such as
acrylic resin or urethane # 71, or a method using rubber latex such as SBR latex or NBR latex, but
rubber latex is relatively often used. The characteristics such as air permeability, moldability and
stiffness of the edge are determined by the difference in combination of sealing treatment,
molding agent treatment and topcoat treatment, and the above-mentioned '# feature is satisfied
with each single treatment alone It's warm to me. (Problems to be Solved by the Invention) The
method of performing the filling treatment and the forming agent treatment by the appropriate
method and performing the top coat treatment with the rubber latex is a widely practiced
method such as serial connection, but the conventional method SBR latex and NBR latex that are
used have poor heat resistance and poor Ilt and when assembled into a speaker, the edge portion
may discolor or harden in a long time, and in some cases, cracking may occur, resulting in
frequency characteristics. A change in movement occurs at the end of the long needle plate.
There was a case that the function of the end was damaged. [Summary of the Invention] (Means
for Solving the Problems) The present inventors completed the present invention as a result of
various examinations in order to compensate for the above-mentioned drawbacks that occur
when the top coat treatment is performed with a rubber latex. It came to That is, the present
invention solves the above-mentioned problems by using a sulfurized homopolymer polyolefin
latex as a rubber latex in the top coat treatment agent. The edge substrate is usually subjected to
top coating treatment, 9 steps of scouring, dyeing, washing with water, dyeing step such as right
side, dip or coating with acrylic resin, urethane resin etc., sealing step such as drying, aging etc.
Phenolic resin in order to provide the formability at the time of pressure molding with Gullo heat
pressure together with the vibration plate.
It is treated with a molding agent such as melamine resin. The top substrate treated with
sulfochlorinated polyolefin latex as a top coat treatment agent is subjected to the edge substrate
subjected to the above treatment. The top coat treatment may be carried out by immersing the
end substrate in rubber latex and drying, and a liquid in which the viscosity of the rubber latex is
rA treated with L1 carboxymethylcellulose, polyvinyl alcohol or the like may be C coated or dried
using a roll or the like. At this time, rubber latex aI! i, It is possible to top coat any amount by
adjusting the viscosity, but generally it is preferable to top coat in the range of 11> 10 to 100 g
per 1 m 'of substrate. Moreover, drying is good for several minutes within the range of 50 ° C to
200 ° C. The edge part obtained by one-pressure hot pressing of an edge substrate treated
according to the present invention is extremely good in heat resistance and weatherability, and
the frequency characteristics even after a long time. There is no change. In addition, depending
on the case, the processing or filling of the conventional forming agent is carried out by changing
the dip or coating amount of the sulfochlorinated polyolefin latex, adjusting the top coat t, or
mixing two or more sulfochlorinated polyolefin latexes. Desired breathability, without processing
#! It is possible to obtain an edge substrate with shape and stiffness, and it is also possible to
greatly simplify the process. As the sulfochlorinated polyolefin latex in the present invention,
sulfochlorinated polyethylene latex, sulfochloro 1-tsuno I / +: l +) ruby t noso → 亭 · 1 1 l + +
rorno V ethylene brobylene diencobori Although merlatex and the like can be used, the use of
sulfochlorinated polyethylene latex is particularly effective. The sulfochlorinated polyolefin latex
in the present invention may optionally be added with conventionally known compounding
chemicals such as acid acceptors, compensating agents, processing aids, pigments and the like,
and the mark filed by the present inventors in advance. The use of the sulfochlorinated polyolefin
latex composition described in JP-A-59-171785 further improves the heat resistance and the
weather resistance. Further, among the combination chemicals, addition of carbon black, among
others, significantly improves the effect. The added aoft of carbon black is used in an amount of
0.01 to 80 parts by weight, preferably 0.1 to 20 parts by weight, based on 100 parts by weight
of sulfochlor.
The addition to the sulfochlorinated polyolefin latex can be carried out directly under stirring,
but it is preferable to sufficiently disperse in water beforehand using a ball mill or the like.
Hereinafter, the present invention will be described by way of examples, but the present
invention is not limited to these examples. (Example) The heat resistance test of the edge part is
(Matter) made by Toyo Seiki Seisakusho Co., Ltd. Gear Aging Test Lead SB7! ! ! The weathering
test is conducted using Suga Testbed Co., Ltd. tear-down cycle sunn yain super long life weather
meter, WEL-8UN-DCH type, and the weathering test is conducted at a temperature of 63 ° C. C.,
test edge temperature C., high temperature trial. (Sulfochlorinated polyethylene (35%
chlorine content) prepared from sulfochlorinated polyethylene / latex-modified nopolyethylene
(density 0.96 g / crrf). The amount of sulfur (12%) was dissolved in 68 kg of toluene. -One
thousand and one $ 401 'Cg of polio noon diethylene (E, 0.4 M! Attached! Jll,) Octyl phenyl ether
sulfate sodium ester salt (Nippon Yushi Co., Ltd., r product name Trax H-45) 1.2 kg (30% pure)
and polyoxyethylene (E, Q, 3Q switch 11) Nonylpheny I ether ether Soda ester soda salt
(manufactured by Nippon Oil and Fats Co., Ltd., product name TRACKS N-N-300) 690 gms 8.5%
pure) and caustic solution '784 g is prepared and two solutions are prepared Photoemulsification was carried out with an emulsifying jar (Karishikushi Kogyo Co., Ltd., '[',
homomixer). The emulsion thus obtained is transferred to a stainless steel container of 2001, and
the jacket portion is heated by circulating hot water at 70 ° C. under a reduced pressure of 150
to 50 mm dg, so that toluene, etc. Was distilled off. After retirement, I obtained the product 80
■. The solids content of the product was 40%. Mix 6% 7F solution of carboxymethyl cellulose
prepared in advance in lC5M latex (the pcsM latex and abbreviation for example lC5M latex), and
mix the solution with a solution viscosity of about 10000 Adjusted to CPS. This solution was
applied to the edge of a phenolic resin-treated cotton cloth and dried at 80 ° C. for 5 minutes.
The impregnated base material was placed in cone paper with a diameter of 12 cm and a mold at
180 ° C., and heated and pressurized at a pressure of 10 kg / Cm ′ ′. The molded edge
portion was subjected to heat resistance test at 100 ° C. for 200 hours and weathering test for
1000 hours, respectively.
The results are shown in Tables 1 and 2. Example 208M 15% carbon black prepared by using a
hole mill in advance in a latex (Asahi Carbon Co., Ltd .: Crystal name: Asahina 70i (AF) small
dispersion is mixed in a ratio of 100: 133) The viscosity was adjusted to about 10000 cps with a
6% aqueous solution of chestnut ■, trade name: nocturnate C = ic G-11 o). This solution was
applied to a cotton cloth which is an edge substrate, and the same test as in Example 1 was
conducted. The results are shown in Table 18 and A-2. The preparation of the rA-modified latex
of sulfochlorfluorochlore latex was carried out in the same manner as in the case of the 08 M
latex to obtain sulfochlorinated polypropylene (scpp) latex and sulfochlorinated ethylene
propylene diene copolymer (SCgPDM) latex. EXAMPLE 13 The procedure is exactly the same as
in Example 1 except that SCPP latex is used instead of latex 08M. Tests were conducted to obtain
the results of Table 1j6 and Table 2. Example 4 All the same except using the SC-PDM latex
instead of the 08M latex in Example 1. Tests were conducted to obtain the results of Tables 1
and 2. Comparative Examples 1 and 2 All the same procedure except that SBR latex was used
instead of sulfochlorinated polyethylene latex in jffEfM 11.2. The test was done. Table 1 (Results
of heat resistance test) Table 2 (Results of weathering test) [Effects of the invention] The fine
plate edge portion for a speaker of the present invention treated with sulfochlorinated polyolefin
is heat resistance and weather resistance test in the working row and comparative example. As is
apparent from the results of (1), it shows very excellent heat resistance and weather resistance.
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