JPH01242223A - Acryl resin extruded sheet with pearly gloss and its manufacture - Google Patents

Abstract

PURPOSE:To manufacture a pearly gloss sheet with the thickness direction substantially in parallel with the thickness direction of a pigment and without unevenness of tone or the like by extruding acryl resin containing a flatting inorganic pigment in the form of sheet from a knead melting extrusion die and laminating with a transparent acryl resin layer. CONSTITUTION:A material composed of methacrylic acid methyl copolymerized heads agitated and mixed with mica constituted of titanium dioxide as flatting pigment are extruded out of an extruder 4. On the other hand, methacrylic acid methyl copolymerized beads not containing flatting inorganic pigment are extruded from a second extruder 5. Both are joined in an adapter 6 provided between both extruders 4 and 5 and a T-type die 7, passed along between a first roll 8 and a second roll 9 and then along a third roll 10. Thus, a pearly gloss sheet having a transparent acryl resin layer 1 on one surface of an acryl resin layer 2 containing a flatting inorganic pigment 3 and having the thickness direction of said pigment 3 substantially in parallel with the sheet thickness direction and without unevenness such as tone or the like and with superior sheet thickness accuracy is manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an acrylic resin plate having pearlescent luster produced by extrusion molding and a method for producing the same.

(Prior art) Acrylic resin plates with pearlescent luster have a unique appearance with excellent mounting properties, and are useful for name plates, displays, signage boards, etc. 1J' (, # shi) During the polymerization, the monomer raw material or the slag-like raw material mixed with the monomer raw material or the slag-like raw material was poured between two glass plates. A so-called Selki A.S 1-method nacreous plate with M orientation is conveniently used.

(Problem to be solved by the invention) However, in the case of the above-mentioned conventional Celcas 1-method pearlescent plate, carbonic acid 111
It is difficult to uniformly disperse and orient the /3n #-1, which causes variations in the degree of dispersion and orientation, resulting in variations in the color tone and transmitted light range of the pearlescent plate. However, there were problems such as poor plate thickness accuracy and high cost. Therefore, by solving the above problems, there is no qualitative paran N of exemption from prosecution,
I want a 4S pearlescent board with excellent board thickness accuracy and low cost!
1 was there.

(Means for Solving the Problems) In view of the current situation, the present inventors developed an extrusion molding method in order to obtain an acrylic resin plate having a color tone of 1st class, a pearlescent light without a paranoid, and an I<. As a result of 101 studies,
By disposing a transparent acrylic resin layer on at least one surface of the acrylic resin layer containing 1.1 of the ingredients, the inventors have found that the object can be achieved and have come up with the present invention.

Zunawarakii haki is 1Iti't'無U'A Bn
Acrylic resin extruded plate, flat, with transparent acrylic resin An acrylic resin containing an inorganic pigment is kneaded and melt-extruded in a first extrusion machine, and a transparent acrylic resin is kneaded and melt-extruded in a second extruder. Each molten resin is supplied to one die, and the molten resin is uniformly extruded in the die. Extrusion while forming a transparent acrylic resin layer on at least one side of the acrylic resin layer containing M IJ'l emulsion, and then molding 1"7
- A method for producing an extruded acrylic resin plate with a pearlescent luster, which is polished and molded using a mold, and contains a faceless I, I, 4-
When extruding the acrylic resin into a plate shape through a kneading melt-extrusion die using an extruder and molding it into a glossy single piece using a molding machine, a transparent acrylic resin film is laminated on at least one side of the extruded resin. This paper presents a method for manufacturing extruded resin plates.

(Function) Aspects referred to in the present invention! P, j14I-machine face *I is a button type face η of mica, carbonated j3, etc. Of these, mica is preferable for samurai. The mica may be natural mica or synthetic mica, but preferably mica whose surface is coated with a metal oxide such as titanium.

The type, particle size, and concentration of surface free a u *'+ can be selected depending on the desired use of the product. Aspect 1
- Desirable from the viewpoint of a large ratio or ease of pigment orientation. For example, ordinary name plates and signboards11<
In the case of a pearlescent plate with a sill A-face, the face ゛P-face f'
I of l is less than 5μIf-, preferably more than 3μa1.
, width and length of 5 to 150 μI11, preferably 5 to
70) tm, aspect ratio is 5 or more, preferably 10 or more, - ratio is 0.1 to 3% by weight, preferably 0.3
~21 [r M9< is desirable 2 (layers and length are too large), and roughness is noticeable and undesirable. Also, the concentration is 0,
IT! ! In the case of volume% wood whirlpool, the pearlescent luster cannot be sufficiently produced,
On the other hand, if it exceeds 3 (!6), the reflection from the surface will increase and the reflection from deep layers will decrease, so the pearlescent luster will actually decrease, which is not preferable.

In the present invention, the acrylic resin a refers to methyl methacrylate.
It is a copolymer or homopolymer containing 5% or more, and may contain a trace amount of dye and pigment for coloring.

In addition, transparent acrylic resin and transparent acrylic resin (RI1
Fat film refers to acrylic resin and acrylic resin film that do not lose their pearlescent luster and have a haze value of 5 or less. As long as the haze value is 5 or more, a trace amount of dye or pigment may be included in the coloring layer.

In the present invention, "the lγ direction of the flat inorganic pigment is substantially parallel to the plate thickness direction" means that the thickness direction of the extruded acrylic resin plate and the flat inorganic pigment are substantially parallel to the plate thickness direction, as shown in Figures 1 and 2. J is an important requirement for developing pearlescent luster.Extrusion molding is a very suitable method for aligning and aligning the flat W IJu ffJ'!il in parallel as described above.

That is, 1 part of acrylic resin containing diarrhoea-free
The melt is fed into a die in a cylindrical shape, and the resin is extruded into a plate shape into the die, and the two tips are sandwiched between rolls and pressurized to obtain the desired thickness. It is possible to mix the flattened pigment in the orientation shown in FIG.

However, the surface of the extruded acrylic resin plate containing biased inorganic BA obtained by the above method is orange peel-like and has low surface luster, and beautiful pearlescent luster cannot be obtained by simply using the extruded acrylic plate containing face 74. .

Therefore, the present inventors applied multilayer extrusion technology and laminate technology, and as a result of further intensive research, the transparent acrylic resin layer was added to at least one surface of the acrylic resin layer containing the threshold and inorganic layer. It has been discovered that by disposing a transparent acrylic resin layer consisting of a resin and a transparent acrylic resin film, an acrylic resin board with beautiful pearlescent luster can be obtained.

In other words, in order to obtain pearlescent luster, the thickness of the transparent acrylic resin layer must be large enough to give the surface a mirror surface, and it must be at least 10 times the thickness of the eccentric inorganic pigment used. 1-
1, preferably 20 times or more.

In addition, J Somi is used to prevent the surface of the acrylic resin layer containing 41% pigment from flattening W, which occurs when transparent acrylic resin is placed on the bank side in bank molding using two extruders. is necessary.

This transparent acrylic resin layer is necessary at least on the significant side, and if the purpose is to provide a signboard with significant both sides, it is preferable to provide the transparent acrylic resin layer on both sides.

In the present invention, as a method for supplying molten resin from two extruders into one die, there is no restriction on FI; as a specific example, the molten resin extruded from two extruders is A compiling adapter one-type system in which the materials are merged before being introduced into the die, and a multi-manifold system in which the components are directly supplied to the die and merged within the die are available.

In the present invention, the transparent acrylic resin film is laminated between the 10th and 20th rules, where the resin released from the die is first held, or between the 20th and 30th rules. The film may be supplied between the 3rd L
It may be laminated after passing through the 7-ru.

(Example) Example 1 For 100 parts by weight of methyl methacrylate copolymer beads containing 6% methyl acrylate, as a ready-to-use material, the thickness was 1 to 3 μm11, the width and length were 5 to 25 μm, and the specific gravity was A mixture of 1 part by weight of titanium dioxide-coated cloud I4 (Nie Merck & Co., West Germany's JA: Iriodin #120) of No. 3 was stirred and mixed in a Henschel mixer and extruded through an extruder 4 as shown in Fig. 3. From oblate j! ! ! : Extruding the methyl methacrylate copolymer beads containing no R pigment,
Both rows are flushed in a two-layer compinning attagter 6 provided between both extrusion sources and a '1'' type tie with a width of 1000 + w, and a transparent resin layer is formed on the upper surface in the 'r type die. An acrylic resin layer containing IM Hiramu (81'! material) was formed on the lower surface, and the gap was adjusted so that the thickness was 21111. Transparent acrylic 161 resin I on the top surface through 0
An acrylic resin board with a beautiful pearlescent luster was obtained, with a thickness of Q of 0°5 and an acrylic resin layer of 1.5 cm thick containing an angled round face on the lower surface.

When the surface and fracture surface were observed using a mold spindle, it was confirmed that the blank 3V particles of Iriodin #120 were oriented almost parallel to the plane in the N direction of the plate.

Example 2 All ponds in which the compiling adapter in Example 1 was changed from 2-layer to 3-layer were made using the same method as Example 1.
Acrylic resin layer (thickness 1.5
A transparent acrylic resin layer (thickness of 0 to 25 m+ each) was formed on the upper and lower surfaces of the acrylic resin extruded plate having a beautiful pearlescent luster without orange peel. When the surface and fracture surface of the plate was observed with #f1 using an rA compact weight, it was found that the flat particles of Iriodin #120 were observed as in Example 1.
It was oriented almost parallel to the surface in the V direction.

Example 3 For 100 parts by weight of methyl methacrylate co-heavy beads containing 6% methyl acrylate, 100 parts by weight of 100 parts by weight of methyl methacrylate co-heavy beads containing 6% of methyl acrylate were added. N
Thickness as fl: 1-3 to 1f11, width and length: 10~
607 z m, specific gravity 3-11, 1 part of titanium-coated mica (manufactured by West German Nie Merck & Co., Ltd.: Ili'shin #100) was stirred and mixed with Δ, Ncielmi ~ → 1- for 1 hour.
Figure 1 11 < Melt extrusion from the first extruder 11 The 111th-rule was directly passed through the 'f-type die 7 without passing through the attagitator as in Example 1, and the gap was adjusted so that the plate thickness was 2 + 1111. A transparent acrylic resin film 12 (Lean Durene, thickness 50 μm, manufactured by Tcll Kagaku FL) was supplied between the 8th and 211th rules 9, and then between the 20th and 30th rules. An acrylic resin plate with a beautiful pearlescent luster was obtained by lamination by thermocompression bonding. When the fractured surface of the upper surface of this plate was examined with a mirror, 140 particles of Iriocin #] (]0 were oriented almost parallel to the surface in the thickness direction. Ratio 1 Shark 1 row 1 In Example 1, the same method as in Example 1 was used except that the second extruder extruded the flat inorganic face of the same composition as the first extruder. Single layer flat!! tfl jJ'i :t'! Daiyu Acrylic (Planning)
Get a fat plate. The top 13 surfaces of this board had an orange beer-like appearance and had low surface gloss and lacked beauty.

(Effects) As described above, the present invention provides 16j 'P, Q! F+
A 7゛ acrylic resin extruded board having a pearlescent luster, in which a transparent acrylic resin layer is disposed on at least one side of the acrylic resin layer containing 7 mm, and the thickness direction of the face layer 1 is substantially parallel to the thickness direction of the plate. Therefore, since the face 14 is uniformly oriented, it has a uniform and beautiful pearlescent luster without any variation, and it is manufactured by the extrusion method, so it is inexpensive. It has the advantage of being 41 degrees thicker.

Flat again! ! When mica is used as the low profile ↑-'I, a pearlescent luster can be obtained, and an acrylic resin board can be obtained that exhibits pearlescent i<, which is preferable for name plays and sign boards.

4. Drawings (',) f'i'h 'i''x via Figure 1 does not show the orientation of the semi-inorganic GN f-1 of the present invention, Figure 2 is the part A in Figure 1. The enlarged conceptual diagram, Figures 3 and 4 are diagrams showing a schematic diagram of extrusion molding using three 17-rules.

■ Transparent acrylic (pigment-containing acrylic resin layer 2: l+, a'tless (acrylic resin layer containing pigment 3:
11ji-V-teru (Ikuface f'-'171: First extruder 5: Second extruder 6 Near tab turf, 'l''4 (17 tie>3=111-ru 0, 21st call lO: No. 317-Le 11: Hank 12: Acrylic Filno 4 1 Near ;jljl!・) 0 people t;

Claims (4)

[Claims] (1) Acrylic resin with pearlescent luster, characterized in that a transparent acrylic resin layer is arranged on at least one side of an acrylic resin layer containing a flat inorganic pigment, and the thickness direction of the pigment is substantially parallel to the plate thickness direction. Extrusion board. (2) The extruded acrylic resin plate according to claim 1, wherein the flat inorganic pigment is mica. (3) An acrylic resin containing a flat inorganic pigment is kneaded and melt-extruded using a first extruder, and a transparent acrylic resin is kneaded and melt-extruded using a second extruder, and each molten resin is supplied to one die and flattened within the die. 1. A method for producing an extruded acrylic resin plate with pearlescent luster, which comprises extruding an acrylic resin layer containing an inorganic pigment while forming a transparent acrylic resin layer on at least one surface, and then polishing the plate with a forming roll. (4) When extruding an acrylic resin containing a flat inorganic pigment into a plate shape through a kneading melt-extrusion die using an extruder and polishing it with a forming roll, it is recommended to laminate a transparent acrylic resin film on at least one side of the extruded resin. A method for producing an extruded acrylic resin plate having a characteristic pearlescent luster.