JP2009013208A - Vinyl chloride-based resin molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vinyl chloride-based resin molding having high flame retardancy and optical characteristics, especially transparency, and suitably used for an industrial material, especially a material for a semiconductor manufacturing device or a liquid crystal manufacturing device. <P>SOLUTION: The light-transmitting vinyl chloride-based resin molding is mainly composed of a mixed resin of a vinyl chloride resin (A) having 56.8% chlorination degree and a chlorinated vinyl chloride resin (B) having 57-68% chlorination degree, wherein a chlorine content rate with respect to the whole of the molding is 53.5-56.4 mass%, and a viscosity ratio η<SB>ap(B)</SB>/η<SB>ap(A)</SB>between apparent viscosity η<SB>ap(B)</SB>of the chlorinated vinyl chloride resin (B) and apparent viscosity η<SB>ap(A)</SB>of the vinyl chloride resin (A) measured under the condition that a temperature is 180°C, a shear rate is 1200/s, a capillary die inside diameter D is 1 mm, a length L is 10 mm, and L/D is 10 in accordance with a test method A2 of JIS K 7199 is 0.7-1.5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vinyl chloride resin molded article having good optical characteristics, particularly transparency and flame retardancy.

  Vinyl chloride resin is widely used as a material in all fields because it has good moldability, mechanical strength and corrosion resistance, is inexpensive, and has good moldability. It is also used in liquid crystal manufacturing equipment.

  However, since vinyl chloride resin contains chlorine, it is flame retardant. However, when it comes into contact with an atmosphere of 200 ° C or higher for a long time, it will thermally decompose, produce smoke, and corrode such as chlorine gas or hydrogen chloride gas. Generates sex gases. When exposed to a high temperature of 600 ° C. or higher, it ignites and burns. For this reason, when a device using a vinyl chloride resin is in a fire, there is a risk that the generated smoke or corrosive gas will damage the precision instruments and products and make it unusable.

  Under the circumstances as described above, research and development of a vinyl chloride resin molded body with improved flame retardancy has been conducted, and the present applicant also has good flame retardancy and optical characteristics (particularly transparency). We have already filed an application for developing a vinyl chloride resin molded body (Patent Document 1).

That is, this molded article of vinyl chloride resin has (1) a surface layer of a highly chlorinated vinyl chloride resin having a chlorination degree of 62 to 66% on both sides of the core layer of the vinyl chloride resin having a chlorination degree of 56 to 57%. Are laminated to form a vinyl chloride resin molded product having a laminated structure in which 56 to 59% by weight of chlorine is contained in the molded product, or (2) vinyl chloride having a chlorination degree of 56 to 57%. Using a mixed resin having a chlorination degree of 61 to 63.5% obtained by mixing a resin and a highly chlorinated vinyl chloride resin having a chlorination degree of 64% or more, the molded body contains 56 to 59% by weight of chlorine. Each of the molded bodies has a maximum heat generation rate when heated and burned under a radiation heating condition of 50 kW / m ² in accordance with ISO-5660. 140kW / ^{m 2} or less, and with good flame retardancy It was. And the former vinyl chloride resin molded article having a laminated structure has a total light transmittance of 70 to 80% and a haze of 3 to 5% when the thickness is 5 mm, and has good transparency. It had sex.
JP 2005-15620 A

  However, among the vinyl chloride resin molded articles of the above-mentioned Patent Document 1, the latter single-layer molded article has a large difference in viscosity between the vinyl chloride resin and the highly chlorinated vinyl chloride resin at the time of melt kneading. And high chlorinated vinyl chloride resin are difficult to mix evenly and uniformly, resulting in white streaks in the molded product, which reduces the total light transmittance of the molded product and increases haze, thereby improving the transparency of the molded product. There was a problem that it was lower than that of a molded article having a laminated structure.

  As a result of various examinations by the present inventor regarding the problem of such a decrease in transparency, when an acrylic processing aid is selected as a processing aid and this acrylic processing aid is blended, the transparency of the molded body is improved. Found the fact that it can. However, when a large amount of acrylic processing aid is blended, a new problem has arisen in that the flame retardancy of the molded article is lowered.

  The present invention has been made under the above circumstances, and the problem to be solved is a combination of good flame retardancy and optical characteristics, particularly transparency, and industrial materials, particularly semiconductor manufacturing apparatuses and liquid crystal manufacturing apparatuses. Another object of the present invention is to provide a vinyl chloride resin molded article that is suitably used as a material for the above.

In order to solve the above problems, a vinyl chloride resin molded article according to the present invention includes a vinyl chloride resin (A) having a chlorination degree of 56.8% and a chlorinated vinyl chloride resin (B) having a chlorination degree of 57 to 68%. And a translucent vinyl chloride resin molded product mainly composed of a mixed resin with a chlorine content of 53.5 to 56.4% by mass in the entire molded product, and a test method of JIS K 7199 The chlorinated vinyl chloride resin (B) measured under the conditions of a temperature of 180 ° C., a shear rate of 1200 / s, a capillary die inner diameter D of 1 mm, a length L of 10 mm, and an L / D of 10 in accordance with A2. The viscosity ratio η _{ap (B)} / η _{ap (A)} between the apparent viscosity η _{ap (B)} and the apparent viscosity η _{ap (A)} of the building chloride resin _(A) is 0.7 to 1.5. It is characterized by.

  Here, the “vinyl chloride resin having a chlorination degree of 56.8%” means a general vinyl chloride resin that is commercially available. Such a general vinyl chloride resin usually has a chlorination degree of ± Since it increases or decreases in the range of 0.5%, all commercially available general vinyl chloride resins having a chlorination degree in the range of 56.8 ± 0.5% are included.

In the vinyl chloride resin molded article of the present invention, the acrylic processing aid is preferably added at a ratio of 0.1 to 2 parts by mass with respect to 100 parts by mass of the mixed resin. The proportion of the vinyl resin (A) is preferably larger than 60% by mass. The ratio P _(B) / P _(A) of the average degree of polymerization P _(B) of the chlorinated vinyl chloride resin ( _B) and the average degree of polymerization P _(A) of the vinyl chloride resin _(A) is 0.51 to 0.51. The average degree of polymerization of the vinyl chloride resin (A) is 650 to 850, and the average degree of polymerization of the chlorinated vinyl chloride resin (B) is preferably 430 to 750.

A typical example of the vinyl chloride resin molded body of the present invention is obtained by stacking a plurality of calender sheets and thermocompression bonding, and has a total light transmittance of 90% or more when the thickness is 5 mm. Is 5% or less, the yellowing degree is 20 or less, and has excellent transparency. And even if it contains a blue pigment, the total light transmittance when the thickness is 5 mm is 60% or more, the haze is 5% or less, the yellowing degree is 0 or less, and it has good transparency. . Moreover, the vinyl chloride resin molded body of the present invention has a maximum heat generation rate of 140 kW / m ² or less and a maximum smoke concentration when heated and burned under a radiation heating condition of 50 kW / m ² in accordance with ISO-5660. It is 7.0 / m or less and has sufficient flame retardancy.

As the vinyl chloride resin molded product of the present invention, the apparent viscosity eta _ap of chlorination degree from 57 to 68% of the chlorinated vinyl chloride resin _(B) (B), chlorination degree 56.8 percent vinyl chloride When the viscosity ratio η _{ap (B)} / η _{ap (A)} to the apparent viscosity η _{ap (A)} of the resin (A) is 0.7 to 1.5, both vinyl chloride resins ( Since the difference in melt viscosity between A) and (B) is not so large, it becomes possible to mix uniformly and sufficiently. If a vinyl chloride resin molded product is produced with such a uniformly mixed resin, mixing failure will occur. Due to this, white streaks are substantially not generated in the molded body. Therefore, there is no decrease in the total light transmittance or increase in haze of the molded article. As described above, the total light transmittance when the thickness is 5 mm is 90% or more, the haze is 5% or less, and the yellowing degree is 20 or less. Even if a vinyl chloride resin molded article having excellent transparency and a blue pigment are contained, the total light transmittance is 60% or more, haze is 5% or less, and yellowing is 0 or less. A vinyl chloride resin molded product can be obtained. Moreover, the vinyl chloride resin molded body of the present invention has a high chlorine content of 53.5 to 56.4% by mass in the entire molded body, so that it is 50 kW / m ² according to ISO-5660 as described above. When it is heated and burned under the above-mentioned radiation heating conditions, the maximum heat generation rate is 140 kW / m ² or less, and the maximum smoke concentration is 7.0 / m or less.

  In the vinyl chloride-based resin molded body of the present invention, a material in which an acrylic processing aid is added at a ratio of 0.1 to 2 parts by mass with respect to 100 parts by mass of the mixed resin does not substantially reduce the flame retardancy. It becomes possible to further improve the transparency. Further, in the molded body in which the proportion of the vinyl chloride resin (A) in the mixed resin is larger than 60% by mass, the vinyl chloride resin (A) has better secondary processability than the chlorinated vinyl chloride resin (B).

The ratio P _(B) / P _(A) of the average degree of polymerization P _(B) of the chlorinated vinyl chloride resin ( _B) and the average degree of polymerization P _(A) of the vinyl chloride resin _(A) is 0.51 to 0.51. The molded body having 1.15, the average degree of polymerization of vinyl chloride resin (A) of 650 to 850, and the molded body of chlorinated vinyl chloride resin (B) having an average degree of polymerization of 430 to 750 are the viscosity ratios described above. Since η _{ap (B)} / η _{ap (A)} is in the range of 0.7 to 1.5 and the melt-kneading property is good, it has both excellent transparency and sufficient flame retardancy.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view of a vinyl chloride resin molded body according to an embodiment of the present invention.

  A vinyl chloride-based resin molded body 1 shown in FIG. 1 is thermocompression integrated by stacking a plurality of calendar sheets 1a mainly composed of a mixed resin of a vinyl chloride resin (A) and a chlorinated vinyl chloride resin (B). A light-transmitting single-layered plate-shaped molded body manufactured by the above method, and this vinyl chloride-based resin molded body 1 (calendar sheet 1a) has a tin-based stabilizer necessary for molding and enhances transparency. A preferable acrylic processing aid is contained above. The vinyl chloride resin molded body 1 contains a silicone processing aid instead of the acrylic processing aid, chlorinated polyethylene, MBS (methyl methacrylate-butadiene-styrene copolymer), etc. Or a blue pigment for reducing the degree of yellowing, an additive such as an ultraviolet absorber or a lubricant.

  As the vinyl chloride resin (A) which is one component of the mixed resin, a commercially available general vinyl chloride resin having a chlorination degree of 56.8% (actually 56.8 ± 0.5%) is available. Among them, those having an average degree of polymerization of 650 to 850 are preferably used.

  Further, as the chlorinated vinyl chloride resin (B) which is the other component of the mixed resin, a chlorinated vinyl chloride resin having a chlorination degree of 57 to 68% is used, and among them, the average polymerization degree is 430 to 750. Some are preferably used.

The above mixed resin of vinyl chloride resin (A) and chlorinated vinyl chloride resin (B) conforms to JIS K 7199 plastic-capillary rheometer and slit flow rheometer test method A2 for plastic flow characteristics test method. The apparent viscosity η _{ap (} ) of the vinyl chloride resin (A) measured under the conditions of a temperature of 180 ° C., a shear rate of 1200 / s, a capillary die inner diameter D of 1 mm, a length L of 10 mm, and an L / D of 10. Considering the apparent viscosity η _{ap (B)} of _A) and the chlorinated vinyl chloride resin (B), the viscosity ratio η _{ap (B)} / η _{ap (A) of both} is 0.7-1.5. In addition, it is necessary to mix and mix the vinyl chloride resin (A) having different average polymerization degrees and the chlorinated vinyl chloride resin (B) having different average polymerization degrees and chlorination degrees.

  When the vinyl chloride resin (A) and the chlorinated vinyl chloride resin (B) in the mixed resin are included in the above viscosity ratio range, the difference in melt viscosity between the two resins during melt kneading is not so large. Since the kneadability is good, it is possible to mix both resins uniformly and sufficiently, and when the vinyl chloride resin molded body 1 is produced using the calendar sheet 1a of the mixed resin thus uniformly mixed, it is white. Since the generation of streaks is substantially eliminated, the excellent light transmittance is 90% or more when the thickness is 5 mm, haze is 5% or less, yellowing degree is 20 or less, preferably 20 to 0. A vinyl chloride resin molded article having good transparency such that the total light transmittance is 60% or more, haze is 5% or less, and yellowing degree is 0 or less even when a blue pigment is contained. Possible to get and That. However, if the combination of the vinyl chloride resin (A) and the chlorinated vinyl chloride resin (B) in the mixed resin deviates from the above viscosity ratio range, the difference in melt viscosity between the two resins during melt kneading Since it is too large and kneading becomes insufficient, white streaks are generated in the molded body and the transparency is lowered, making it difficult to achieve the object of the present invention.

A more preferable range of the viscosity ratio η _{ap (B)} / η _ap (A) between the vinyl chloride resin (A) and the chlorinated vinyl chloride resin (B) is 1.18 to 1.46, and is included in this range. When the vinyl chloride resin (A) and the chlorinated vinyl chloride resin (B) are combined and mixed, the kneadability of both resins is further improved, so that white stripes disappear completely and a molded article having excellent transparency is obtained. It becomes possible.

Also, the vinyl chloride resin in the mixed resin (A) and chlorinated vinyl chloride resin (B) has an average polymerization degree of the average degree of polymerization P _(B) and the vinyl chloride resin of a chlorinated vinyl chloride resin (B) (A) such that the ratio P between the _{P (a) (B) /} P (a) is from 0.51 to 1.15, it is preferable to combine in consideration of the average degree of polymerization of the two resins. As the average degree of polymerization P of the vinyl chloride resin _(A) (A) is in the range of 650 to 850 as described above, the average degree of polymerization P of chlorinated vinyl chloride resin _(B) (B) is previously described The mixed resin in which the ratio P _(B) / P _(A) of the average degree of polymerization of the two resins is within the above range is in the range of 430 to 750, the viscosity ratio η _{ap (B)} / η _{ap Since (A)} is in the range of 0.7 to 1.5, the kneadability is good, and a vinyl chloride resin molded article having excellent transparency can be obtained. Incidentally, the vinyl chloride resin (A) having an average degree of polymerization exceeding 850 or a chlorinated vinyl chloride resin having an average degree of polymerization exceeding 750 may cause a decrease in kneadability. The vinyl resin (A) is not preferable because it requires a high molding temperature during kneading and tends to increase the degree of yellowing.

  The proportion of the vinyl chloride resin (A) in the mixed resin is preferably greater than 60% by mass. The vinyl chloride resin (A) having a chlorination degree of 56.8% is more readily available than the chlorinated vinyl chloride resin (B) having a high chlorination degree of 57 to 68%. When A) is mixed in an amount of more than 60% by mass, for example, the one containing 60% by mass or less of a vinyl chloride resin having a chlorination degree of 56.8% as in the vinyl chloride resin molded article of Patent Document 1 Compared to the above, the workability and moldability at the time of preparation of the calendar sheet and thermocompression bonding are good, so if the vinyl chloride resin (A) is mixed more than 60% by mass, these workability and moldability Also good secondary workability.

The chlorine content in the entire vinyl chloride resin molded product is 53.5 to 56.4% by mass by using the above mixed resin as a main component and blending a tin stabilizer or an acrylic processing aid. Thus, it is necessary to determine the content of the mixed resin, the ratio of the chlorinated vinyl chloride resin in the mixed resin, the degree of chlorination, and the like. When the chlorine content in the entire molded body is within the above range, sufficient flame retardancy is exhibited, and the maximum when heated and burned under a radiation heating condition of 50 kW / m ² in accordance with ISO-5660. The heat generation rate is suppressed to 140 kW / m ² or less, and the maximum smoke generation concentration is suppressed to 7.0 / m or less. However, if the chlorine content is less than 53.5%, there is a concern that the flame retardancy of the molded product may be reduced, and if the chlorine content is more than 56.4% by mass, chemical resistance and the like may be reduced. Neither is desirable because there is a fear of inviting them.

  This vinyl chloride-based resin molded body 1 needs to contain a tin-based stabilizer as a heat stabilizer, and a lead-based stabilizer that cannot obtain a transparent molded body cannot be used. The content of the tin-based stabilizer is preferably 3 to 10 parts by mass with respect to 100 parts by mass of the mixed resin to prevent deterioration of the resin and transparency.

The vinyl chloride resin molded body 1 preferably contains an acrylic processing aid useful for enhancing transparency. As the acrylic processing aid, methyl methacrylate-alkyl acrylate copolymer, methyl methacrylate-acrylic ester copolymer, alkyl methacrylate copolymer and the like are used. The content of the acrylic processing aid is preferably in the range of 0.1 to 2 parts by mass with respect to 100 parts by mass of the mixed resin. If the content is within this range, the flame retardancy of the molded product is reduced. Transparency can be improved without substantially lowering. When the content of the acrylic processing aid is less than 0.1 parts by mass, there is almost no improvement effect on moldability and transparency, and conversely, when it exceeds 2 parts by mass, as shown in the data of Examples described later, The flame retardancy of the molded product is lowered, the maximum heat generation rate exceeds 140 kW / m ² , and the maximum smoke concentration exceeds 7.0 / m. The more preferable content of the acrylic processing aid is in the range of 0.2 to 1 part by mass.

  Further, a blue pigment is added to the vinyl chloride resin molded body 1, and the yellowishness caused by the thermal deterioration of the resin during the production of the molded body is complemented and offset by the blue pigment to have a yellowing degree of zero to minus. It may be a molded body. As the blue pigment, ultramarine blue, phthalocyanine blue pigment, anthraquinone pigment and the like are preferably used, and the content thereof is 0.002 to 0.02 parts by mass, preferably 0.005 with respect to 100 parts by mass of the mixed resin. It is in the range of ~ 0.015. When the blue pigment is contained in the above-described content, the transparency of the molded product is lowered to some extent, but still the total light transmittance when the thickness is 5 mm is 60% or more, the haze is 5% or less, and the yellowing degree is It becomes a molded article having good transparency of 0 or less, preferably 0 to -40.

  In addition, a silicone processing aid may be added to the vinyl chloride resin molded body 1 or a reinforcing agent such as chlorinated polyethylene or MBS (methyl methacrylate-butadiene-styrene copolymer) may be added. Although it is possible, when silicone processing aids are added or when chlorinated polyethylene is added, transparency is greatly reduced, and when MBS is added, flame retardancy is reduced, which is not preferable.

  The single-layer plate-like vinyl chloride resin molded body 1 as described above is obtained by adding a tin-based stabilizer and an acrylic processing aid to the above-mentioned mixed resin of the vinyl chloride resin (A) and the chlorinated vinyl chloride resin (B). By preparing a calender sheet 1a using a mixed resin composition prepared by mixing an agent and, if necessary, a blue pigment, etc., by stacking a plurality of the calender sheets 1a and integrating them by thermocompression bonding with a hot press machine, It can be manufactured easily. Moreover, it can manufacture easily by extruding said mixed resin composition in plate shape from a melt extrusion molding machine.

  Next, more specific examples of the vinyl chloride resin molded body of the present invention will be given.

(Examples 1-17)
As a chlorinated vinyl chloride resin, (a) average degree of polymerization 700 (chlorination degree 63.5%, apparent viscosity 1.72 × 10 ⁴ poise), (b) average degree of polymerization 700 (chlorination degree 64.5%) , Apparent viscosity 1.74 × 10 ⁴ poise), (c) average polymerization degree 800 (chlorination degree 66.5%, apparent viscosity 2.20 × 10 ⁴ poise), (d) average polymerization degree 600 (chlorine) degree 64.5%, apparent viscosity 1.58 × 10 ⁴ poise), five types of (e) an average degree of polymerization of 480 (degree of chlorination 63.0%, apparent viscosity 1.18 × 10 ⁴ poise) Got ready.
As vinyl chloride resin, (f) average polymerization degree 800 (chlorination degree 56.8%, apparent viscosity 1.34 × 10 ⁴ poise), (g) average polymerization degree 1000 (chlorination degree 56.8%) , Apparent viscosity 1.74 × 10 ⁴ poise), (h) average polymerization degree 1300 (chlorination degree 56.8%, apparent viscosity 1.75 × 10 ⁴ poise).
In addition, a tin-based stabilizer, an acrylic processing aid (methyl methacrylate-alkyl acrylate copolymer), a silicone-based processing aid, chlorinated polyethylene (chlorination degree 30%), and MBS (methacrylic acid) Methyl-butadiene-styrene copolymer) reinforcing agent and anthraquinone pigment were also prepared.
The apparent viscosity of the chlorinated vinyl chloride resin and the vinyl chloride resin is 180 ° C. at a temperature of 180 ° C. according to JIS K 7199 plastic-capillary rheometer and plastic flow property test method A2 using a slit die rheometer. It is a value measured under conditions where the speed is 1200 / s, the capillary die inner diameter D is 1 mm, the length L is 10 mm, and the L / D is 10, and the average degree of polymerization is a value measured according to JIS K6720-2. It is.

  Using the mixed resin compositions having the compositions shown in Examples 1 to 17 in Tables 1 and 2, calender sheets each having a thickness of 0.5 mm were prepared, and each of the calender sheets was stacked 10 times with a hot press machine. The transparent vinyl chloride resin plates (thickness 5 mm) of Examples 1 to 17 were prepared by thermocompression integration.

And about the vinyl chloride resin board of Examples 1-17, while calculating the chlorine content rate which occupies for the whole resin board, apparent viscosity ratio (eta) of a vinyl chloride resin (A) and a chlorinated vinyl chloride resin (B) _{ap (B)} / η _{ap (A)} was calculated. The values are shown in Tables 1 and 2.

Subsequently, about the vinyl chloride-type resin board of Examples 1-17, the haze, the total light transmittance, and the yellowing degree were measured. The measured values are shown in Tables 1 and 2.
The haze is a value measured in accordance with JIS K7136 plastic-transparent material haze calculation method. The total light transmittance is JIS K7361-1 plastic-the test method for the total light transmittance of the transparent material- It is a value measured in accordance with the first part single beam method, and the yellowing degree is a value measured in accordance with JIS K7373 plastic-yellowness and yellowing.

  The vinyl chloride resin plates of Examples 1 to 17 were examined with the naked eye for the presence of white stripes. As a result, the presence or absence of white stripes was not confirmed with the naked eye.

Furthermore, about the vinyl chloride-type resin board of Examples 1-17, based on ISO-5660, the maximum heat release rate and the maximum smoke generation density when heating and burning on 50 kW / m < ² > radiation conditions were measured. The results are shown in Tables 1 and 2.

(Comparative Examples 1-3)
For comparison, using the mixed resin compositions having the compositions shown in Comparative Examples 1 to 3 in Table 2, calendar sheets each having a thickness of 0.5 mm were prepared, and each of the calendar sheets was stacked one by one and hot pressed. The vinyl chloride resin plates (thickness 5 mm) of Comparative Examples 1 to 3 were produced by thermocompression integration with a machine.
Then, for these vinyl chloride resin plates, as in Examples 1 to 17, while calculating the chlorine content and the apparent viscosity ratio η _{ap (B)} / η _{ap (A)} in the entire resin plate, The haze, total light transmittance, yellowing degree, maximum heat generation rate, and maximum smoke concentration were measured. The results are also shown in Table 2. In addition, as a result of observing the presence or absence of white streaks with the naked eye, white streaks were confirmed on the vinyl chloride resin plates of Comparative Examples 1 and 2, but white streaks were confirmed on the vinyl chloride resin plate of Comparative Example 3. There wasn't.

As shown in Tables 1 and 2, each of the vinyl chloride resin plates of Examples 1 to 17 has an apparent viscosity ratio between the chlorinated vinyl chloride resin (B) and the vinyl chloride resin (A) in the mixed resin. η _{ap (B)} / η _{ap (A)} is in the range of 0.7 to 1.5, and the chlorine content in the entire resin plate is also in the range of 53.5 to 56.4% by mass.
Therefore, except for the vinyl chloride resin plate of Example 11 containing an MBS reinforcing agent that adversely affects flame retardancy, the vinyl chloride resin plates of other examples have good flame retardancy, The heating rate is 140 kW / m ² or less, and the maximum smoke concentration is 7.0 / m or less. Further, the vinyl chloride resin plates of Examples 1 to 17 are substantially free from white streaks, and each of Examples 13 and 13 contains a silicone processing aid and chlorinated polyethylene that adversely affects transparency. 14 vinyl chloride resin plates, vinyl chloride resin plates of Examples 7 to 10 containing anthraquinone pigments, and vinyl chloride resin plates of Example 12 not containing acrylic processing aids, The vinyl chloride resin plates of other examples have excellent transparency, having a haze of 5% or less and a total light transmittance of 90% or more. Even in the vinyl chloride resin plates of Examples 7 to 10 containing an anthraquinone pigment, the haze is 3.7 to 3.9% and the total light transmittance is 74.1 to 82.8%, which is good. It has excellent transparency. When the vinyl chloride resin plate of Example 12 not containing an acrylic processing aid and the vinyl chloride resin plate of Example 11 containing 0.1 part by weight of an acrylic processing aid were compared, an acrylic processing aid was obtained. It can be seen that this is effective for improving transparency, particularly for reducing haze.
The yellowing degree is the same as that of the other examples except for the vinyl chloride resin plates of Examples 2, 3, and 5 in which a vinyl chloride resin having an average polymerization degree of 1000 and a vinyl chloride resin having an average polymerization degree of 1300 are mixed. The vinyl resin plates are 19.1 to 16.5, and in particular, the vinyl chloride resin plates of Examples 7 to 10 containing anthraquinone pigments are −1.1 to −31, which are transparent or slightly It exhibits a hue like glass having a blue tint. This indicates that anthraquinone pigments are extremely effective in reducing the yellowing degree, and that a vinyl chloride resin having a high average degree of polymerization adversely affects the yellowing degree.

On the other hand, the vinyl chloride resin plates of Comparative Examples 1 to 3 all have a chlorine content in the range of 53.5 to 56.4% by mass, but the chlorinated vinyl chloride in the mixed resin. The apparent viscosity ratio η _{ap (B)} / η _{ap (A} ) between the resin (B) and the vinyl chloride resin (A) is outside the range of 0.7 to 1.5. Therefore, the vinyl chloride resin plates of Comparative Examples 1 and 2 are excellent, except for the vinyl chloride resin plate of Comparative Example 3 that contains more than 2 parts by mass of an acrylic processing aid that reduces flame retardancy. Although it has flammability, since white streaks are generated, transparency is not so good, haze is 8.0 to 8.8%, and total light transmittance is 66 to 88%. From this, when the chlorine content is in the range of 53.5 to 56.4% by mass, excellent flame retardancy is exhibited, but the chlorinated vinyl chloride resin (B) and the vinyl chloride resin (A) When the apparent viscosity ratio η _{ap (B)} / η _{ap (A)} is outside the range of 0.7 to 1.5, the transparency is lowered and the total light transmittance is reduced from 90%. You can see that the haze is higher than 5%.
The vinyl chloride resin plate of Comparative Example 3 containing an acrylic processing aid in a larger amount than 2 parts by mass has excellent transparency, but flame retardancy is greatly reduced, and the maximum heat generation rate is increased. The maximum smoke concentration is 162 kW / m ² and 13.4 / m. From this, it can be seen that the acrylic processing aid is extremely effective in improving the transparency, but if it is contained in a larger amount than 2 parts by mass, the flame retardancy is greatly reduced.

It is sectional drawing of the vinyl chloride-type resin molding which concerns on one Embodiment of this invention.

Explanation of symbols

1 Vinyl chloride resin molded product 1a Calendar sheet

Claims (9)

A translucent vinyl chloride resin molded product comprising a mixed resin of a vinyl chloride resin (A) having a chlorination degree of 56.8% and a chlorination vinyl chloride resin (B) having a chlorination degree of 57 to 68% as a main component. The chlorine content in the entire molded body is 53.5 to 56.4% by mass, the temperature is 180 ° C., the shear rate is 1200 / s according to JIS K 7199 test method A2, the capillary die Apparent viscosity η _{ap (B)} of chlorinated vinyl chloride resin (B) and apparent viscosity of building chloride resin (A) measured under the conditions of inner diameter D of 1 mm, length L of 10 mm, and L / D of 10. _A vinyl chloride resin molded article having a viscosity ratio η _{ap (B)} / η _{ap (A) of} η _{ap (A)} of 0.7 to 1.5.   The vinyl chloride resin molded product according to claim 1, wherein an acrylic processing aid is added at a ratio of 0.1 to 2 parts by mass with respect to 100 parts by mass of the mixed resin.   The vinyl chloride resin molded article according to claim 1 or 2, wherein a proportion of the vinyl chloride resin (A) in the mixed resin is larger than 60% by mass. The ratio P _(B) / P _(A) between the average degree of polymerization P _(B) of the chlorinated vinyl chloride resin _(B) and the average degree of polymerization P _(A) of the vinyl chloride resin _(A) is 0.51-1. The vinyl chloride resin molded article according to any one of claims 1 to 3, which is 15.   The vinyl chloride resin molded article according to claim 4, wherein the average degree of polymerization of the vinyl chloride resin (A) is 650 to 850, and the average degree of polymerization of the chlorinated vinyl chloride resin (B) is 430 to 750.   The vinyl chloride resin molded article according to any one of claims 1 to 5, obtained by thermocompression bonding a plurality of calendar sheets.   The vinyl chloride resin molded article according to any one of claims 1 to 6, wherein when the thickness is 5 mm, the total light transmittance is 90% or more, the haze is 5% or less, and the yellowing degree is 20 or less.   7. The vinyl chloride according to claim 1, comprising a blue pigment, having a total light transmittance of 60% or more, a haze of 5% or less, and a yellowing degree of 0 or less when the thickness is 5 mm. Resin molded product. The maximum heat generation rate when heated and burned under a radiation heating condition of 50 kW / m ² in accordance with ISO-5660 is 140 kW / m ² or less, and the maximum smoke concentration is 7.0 / m or less. Item 9. A vinyl chloride resin molded article according to any one of Items 8 to 10.

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