JPH0827346A - Postchlorinated poly(vinyl chloride) resin composition - Google Patents

Abstract

PURPOSE:To obtain a postchlorinated poly(vinyl chloride) resin composition improved in impact resistance and vacuum/pressure moldability without detriment to heat resistance and flame retardancy. CONSTITUTION:This composition comprises 100 pts.wt. post-chlorinated poly(vinyl chloride) resin having a chlorine content of 62-70wt.% and an average degree of polymerization of 600-1000, 15-25 pts.wt. multicomponent acrylic rubber resin and 1-10 pts.wt. acrylic processing aid.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to a post-chlorinated polyvinyl chloride resin composition.

[0002]

2. Description of the Related Art Conventionally, a post-chlorinated polyvinyl chloride resin (CPVC) has been known as a resin having heat resistance and flame retardancy.

[0003]

However, since the conventional CPVC composition has insufficient impact resistance and poor vacuum / pneumatic moldability, CPVC requires impact resistance and flame retardancy. There is a problem that it cannot be used for applications such as a housing of a device.

[0004] Conventionally, there are some which try to satisfy the above-mentioned performance by adding a flame retardant to a resin other than CPVC, but they have not yet been given sufficient flame retardancy,
Such an additive often has a problem that the performance of the resin itself may be significantly deteriorated.

The object of the present invention is to solve the above-mentioned problems of the prior art and to impart post-chlorinated polyvinyl chloride resin having heat resistance and flame retardancy with impact resistance and vacuum / pneumatic moldability, It is suitable for use in housings of various devices that require flame retardancy and impact resistance without causing damage or deformation due to heat during storage, transportation, or outdoor use, especially for computer housings. There is an attempt to provide post-chlorinated polyvinyl chloride resin compositions that are possible.

[0006]

In order to achieve the above object, the present invention has a chlorine content of 62 to 70% by weight and an average degree of polymerization of 600 to 1000, and 100% by weight of post-chlorinated polyvinyl chloride resin. Parts and multi-component acrylic rubber resin 1
The gist of the post-chlorinated polyvinyl chloride resin composition is characterized in that 5 to 25 parts by weight and 1 to 10 parts by weight of an acrylic processing aid are blended.

The above post-chlorinated polyvinyl chloride resin (CPV
As C), a post-chlorinated polyvinyl chloride resin having a chlorine content of 62 to 70% by weight and an average degree of polymerization of 600 to 1000 is used.

Here, the chlorine content of CPVC is 62% by weight.
If it is less than, a product having sufficient heat resistance cannot be obtained,
Further, if the chlorine content exceeds 70% by weight, the melt viscosity becomes high and the thermal stability is remarkably inferior, which causes technical difficulties in processing the resin composition, which is not preferable.

On the other hand, if the average degree of polymerization of CPVC is less than 600, sufficient impact resistance cannot be obtained, and if the average degree of polymerization exceeds 1000, processing of the resin composition also involves technical difficulties. Therefore, it is not preferable.

In particular, in view of workability, in order to exert a well-balanced performance of impact resistance, heat resistance and vacuum / pneumatic moldability, the chlorine content is from 64 to 66% by weight and the average degree of polymerization is It is preferred to use a post-chlorinated polyvinyl chloride resin of 600-800.

The reason why the multi-component acrylic rubber resin is added to the CPVC is to improve impact resistance and vacuum / pneumatic molding.

Examples of the multi-component acrylic rubber-based resin include a multi-component resin obtained by graft-polymerizing a monomer such as methyl methacrylate, styrene and acrylonitrile on a copolymer rubber mainly composed of an acrylic ester. it can. In order to develop the required impact strength in these multi-component acrylic rubber resins, it is desirable that the graft-polymerized component contains acrylonitrile.

If the amount of the multi-component acrylic rubber resin is less than 15 parts by weight with respect to 100 parts by weight of the CPVC, the impact resistance and the performance of vacuum / pneumatic molding will be deteriorated. 2 resin
If it exceeds 5 parts by weight, the heat distortion temperature is lowered and the required heat resistance and flame retardance cannot be maintained, which is not preferable.

Further, the reason why the acrylic processing aid is added to the CPVC is to improve the vacuum / pneumatic moldability.

Here, as the acrylic processing aid, for example, a high molecular weight copolymer of acrylic ester such as 2-ethylhexyl acrylate / butyl acrylate copolymer, and a copolymer of methyl methacrylate and acrylic ester. Etc. The molecular weight is 1
It is preferably about 1,000,000 or more and 2,000,000 or less.

When the amount of the acrylic processing aid is less than 1 part by weight based on 100 parts by weight of the CPVC, the vacuum / pressure air moldability of the resin composition cannot be sufficiently improved, and the acrylic processing aid is also not available. If the agent exceeds 10 parts by weight,
It is not preferable because the impact resistance is lowered.

The CPVC composition according to the present invention contains, in addition to the above-mentioned multi-component acrylic rubber resin, which is a constituent component thereof, and an acrylic processing aid, a stabilizer, a lubricant in consideration of processability. It is preferable to add additives such as

Here, as the stabilizer, for example, butyltin maleate polymer, butyltin maleate ester or the like is used. The amount of stabilizer added is preferably 2 to 5 parts by weight per 100 parts by weight of CPVC. If the amount of the stabilizer is less than 2 parts by weight, the thermal stability of CPVC is significantly reduced, which is not preferable. On the other hand, if the amount of the stabilizer exceeds 5 parts by weight, the effect of the thermal stability will reach a ceiling and the thermal stability corresponding to the added amount will not be obtained, which is not preferable.

As the lubricant, for example, olefin wax, montanic acid wax, etc. are used. The amount of the lubricant blended is preferably 2 to 4 parts by weight with respect to 100 parts by weight of CPVC. If the amount of the lubricant is less than 2 parts by weight, the melt viscosity will be high and the extrudability will be poor, which is not preferable. On the other hand, if the amount of the lubricant exceeds 4 parts by weight, the slipperiness between the resin and the metal becomes too strong, and pulsation may occur in the resin discharge during extrusion, which is not preferable.

[0020]

The above post-chlorinated polyvinyl chloride resin composition of the present invention has a specific post-chlorinated polyvinyl chloride resin (CPVC) having a chlorine content of 62 to 70% by weight and an average degree of polymerization of 600 to 1000. On the other hand, since the multi-component acrylic rubber-based resin and the acrylic processing aid are mixed in a predetermined amount, the post-chlorinated polyvinyl chloride resin retains its heat resistance and flame retardancy as it is, It can greatly improve impact resistance and vacuum / pneumatic moldability, and
It can also be used for housings of various devices that require flame resistance and shock resistance without causing damage and deformation due to heat during transportation and outdoor use, especially for housings of computers.

[0021]

Next, examples of the present invention will be described together with comparative examples.

Example 1 100% by weight having a chlorine content of 64% by weight and an average degree of polymerization of 800 after-chlorinated polyvinyl chloride resin (CPVC) (trade name, heat-resistant Kanevinyl H-438, manufactured by Kanebuchi Chemical Co., Ltd.) 20 parts by weight of a multi-component acrylic rubber-based resin (trade name, Kaneace FM, manufactured by Kanebuchi Kagaku Co., Ltd.) and 5 parts of an acrylic processing aid (trade name, P-551, manufactured by Mitsubishi Rayon Co., Ltd.) CP of the present invention
The VC composition was formulated.

In the CPVC composition, considering the processability thereof, 3 parts by weight of a stabilizer: butyltin malate polymer (trade name, TN-100, manufactured by Sakai Chemical Industry Co., Ltd.) and a lubricant: 3 parts by weight of an olefin wax (trade name, Hoechst wax PE-103, manufactured by Hoechst Co., Ltd.) were blended.

Then, the blended composition was mixed with a mixer for 10
Mix for minutes and simultaneously heat to 110 ° C. This CPVC
Using an extruder, coat the composition with a coat hanger die to a thickness of 3
It was molded into a plate-shaped CPVC molded body of mm.

Example 2 Post-chlorinated polyvinyl chloride resin having a chlorine content of 65% by weight and an average degree of polymerization of 670 (trade name, heat-resistant Kane vinyl H
-536, manufactured by Kanebuchi Kagaku Co., Ltd., except that a plate-like CP having a thickness of 3 mm is used in the same manner as in Example 1 above.
A VC molded body was molded.

Comparative Examples 1 to 7 For comparison, the following various CPVC compositions were blended, and the constituent components and blending amounts are summarized in Table 1.

Here, in Comparative Example 1, the same material as in Example 1 was used, but the compounding amount of the multi-component acrylic rubber resin was set to 10 parts by weight, which was less than the composition range of the present invention.

In Comparative Example 2, the same post-chlorinated polyvinyl chloride resin as in Example 2 was used, and the compounding amount of the multi-component acrylic rubber resin was the same as that in Comparative Example 1, but the composition of the present invention was used. The amount was 30 parts by weight, which was more than the range.

In Comparative Example 3, a post-chlorinated polyvinyl chloride resin having a chlorine content of 60% by weight and an average degree of polymerization of 800, which is outside the scope of the present invention, was used.

In Comparative Example 4, a post-chlorinated polyvinyl chloride resin having an average degree of polymerization of 500 having a chlorine content of 64% by weight and outside the scope of the present invention was used.

Comparative Example 5 is similar to Example 1, except that
The amount of the acrylic processing aid compounded was set to 0.

In Comparative Example 6, the same material as in Example 1 was used, but the amount of the acrylic processing aid compounded was 15 parts by weight, which is higher than the composition range of the present invention.

In Comparative Example 7, the same post-chlorinated polyvinyl chloride resin as in Example 2 was used, but the compounding amounts of the multi-component acrylic rubber resin and the acrylic processing aid were both set to 0.

Then, in the same manner as in Example 1, various CPVC compositions of these comparative examples were molded into a plate-shaped CPVC compact having a thickness of 3 mm.

Evaluation Test Various CPVC molded products molded from the CPVC compositions of Examples 1 and 2 and Comparative Examples 1 to 7 obtained as described above were subjected to impact resistance, deflection temperature under load, vacuum / air pressure. Various physical properties such as moldability and flame retardancy were measured, and the obtained results are also shown in Table 1.

The evaluation method of each physical property is as follows.

(1) Impact resistance For each test piece, the Izod impact strength at room temperature was measured according to ASTM D256.

(2) Deflection temperature under load The deflection temperature under load was measured for each test piece under a load of 18.6 kg / cm ² in accordance with ASTM D648.

(3) Vacuum / compressed air forming property Vacuum and compressed air forming were performed for each test piece by using a rectangular parallelepiped female mold corresponding to expansion magnifications of 3, 4, 5, and 6 times, respectively. The thickness of the side surface / bottom surface was measured, and evaluation was made based on the size of the variation in wall thickness.

Here, the evaluation of the vacuum / pneumatic moldability is as follows.

⊚: The variation in wall thickness is small even if the expansion ratio exceeds 4 times.

◯: The expansion magnification is 4 times and the variation in wall thickness is small.

X: The expansion ratio is 4 times, and the variation in wall thickness is large.

(4) Flame Retardancy Each test piece was evaluated according to the UL-94 test method and evaluation criteria.

Here, the evaluation of flame retardancy is as follows.

⊚: Flame retardant equivalent to V-0 even if the thickness is less than 0.3 mm.

◯: 0.3 mm in thickness and having flame retardancy equivalent to V-0.

X: 0.3 mm in thickness, no flame retardancy equivalent to V-0.

[0049]

[Table 1] As is clear from the results in Table 1 above, the molded product of the CPVC composition according to Example 1 of the present invention has good impact resistance, high deflection temperature under load, heat resistance, and vacuum / pneumatic pressure. The moldability and flame retardancy were also very good.

Therefore, the CPVC composition according to the present invention can be used for various equipments which are required to have flame retardancy and impact resistance without being damaged and deformed by heat during storage, transportation and outdoor use. It could be used for housings, especially computer housings.

A molded article of the CPVC composition of Example 2 having a chlorine content of 65% by weight and a post-chlorination polyvinyl chloride resin having an average degree of polymerization of 670 different from that of Example 1 was used. The impact resistance was slightly low, but the deflection temperature under load was very high, and it had excellent heat resistance, and also had extremely good vacuum / pneumatic moldability and flame retardancy.

On the other hand, in Comparative Example 1 in which the compounding amount of the multi-component acrylic rubber resin is smaller than the composition range of the present invention, the deflection temperature under load is high and the flame retardancy is good, but the Izod impact strength is extremely high. It was low, had a problem with impact resistance, and had poor vacuum / pneumatic moldability.

Further, in Comparative Example 2 in which the compounding amount of the multi-component acrylic rubber resin was set to be larger than the composition range of the present invention, both the Izod impact strength and the deflection temperature under load were slightly low, and the vacuum / pneumatic moldability was Good, but very poor flame retardancy.

Next, the chlorine content of 6 outside the range of the present invention
In Comparative Example 3 in which the post-chlorinated polyvinyl chloride resin having 0 wt% was used, the Izod impact strength was very high, the deflection temperature under load was slightly low, and the vacuum / pneumatic moldability was good, but it was difficult. The flammability was very poor.

An average degree of polymerization of 50, which is outside the scope of the present invention,
In Comparative Example 4 using the post-chlorinated polyvinyl chloride resin of 0, the Izod impact strength was extremely low.

Further, in Comparative Example 5 in which the amount of the acrylic processing aid compounded was 0, there was no problem in Izod impact strength and flame retardancy, but the deflection temperature under load and vacuum
The compressed air formability was poor.

Further, in Comparative Example 6 in which the amount of the acrylic processing aid compounded was larger than the composition range of the present invention, the Izod impact strength was extremely low.

Finally, in Comparative Example 7 in which the amounts of the multi-component acrylic rubber resin and the acrylic processing aid were both 0, the Izod impact strength was extremely low and the vacuum / pneumatic moldability was very high. It was inferior.

[0059]

As described above, the post-chlorinated polyvinyl chloride resin composition according to the present invention has a chlorine content of 62 to 70% by weight and an average degree of polymerization of 600 to 1000. 100 parts by weight, 15 to 25 parts by weight of multi-component acrylic rubber resin, and acrylic processing aid 1 to
According to the present invention, the heat resistance and flame retardancy of the post-chlorinated polyvinyl chloride resin are maintained as they are, and the impact resistance and Various types that can significantly improve vacuum / pneumatic moldability and require flame resistance and impact resistance without being damaged or deformed by heat during storage, transportation, or outdoor use. The present invention has an effect that it can be used as a housing of a device, especially as a housing of a computer.

Claims (1)

[Claims] 1. 100 to 100 parts by weight of a post-chlorinated polyvinyl chloride resin having a chlorine content of 62 to 70% by weight and an average degree of polymerization of 600 to 1000, and a multi-component acrylic rubber-based resin 15 to
A post-chlorinated polyvinyl chloride resin composition comprising 25 parts by weight and 1 to 10 parts by weight of an acrylic processing aid.