JPS62144925A - Preparation of resin stretched body - Google Patents

Abstract

PURPOSE:To prepare a resin stretched body having super mechanical properties by quenching the shaping material of resin composite comprising polymer carrying benzene ring as essential ingredient and cold stretching after being stretched or rolled within a specified range of temperature. CONSTITUTION:A resin composite material contains at least more than one kind of polymer carrying benzene ring. A primary stretching is carried out for the resin composite material used as a shaping material such as film, fibrous material, etc. Said stretching is carried out within a range of temperature more than the temperature at which the polymer carrying benzene ring starts to be softened and less than a temperature at which the same starts to flow. The most important purpose of the primary stretching is to prepare the resin composite material ready for the process to improve fragility of the same to be carried out by the quenching process to follow. Next, the stretched material is quenched. In said quenching, the temperature is quickly lowered down to less than the temperature at which softening is starting before the relaxation of stress is completed, while the stretched material is maintained as it is. The fragility of the shaping material of resin composite is improved ready for cold stretching. Then, the secondary stretching is carried out for the stretched material to prepare a resin stretched material of film, fibrous, or other types. Said second stretching is the cold stretching under less than the temperature at which softening is starting.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for producing a stretched resin body that can have excellent mechanical properties.

C. Background Art] -i. By stretching a shaped polymer body (unstretched body), mechanical properties such as strength and modulus of elasticity are improved. However, for example, in the case of a resin composition that contains a benzene ring-containing polymer such as polystyrene as an essential component and optionally contains a benzene ring-free polymer such as polymethyl methacrylate, the excipient is ,
Since it is brittle, even if you try to cold stretch it, it will not work. Therefore, it is necessary to draw the film under high-temperature conditions higher than the temperature at which the benzene ring-containing polymer begins to soften. However, when stretched at high temperatures, intermolecular slippage tends to occur, making it difficult to exhibit the stretching effect. Moreover, the temperature at which softening begins (glass transition point) is significantly different (50°C or higher).
In the case of a resin composition that uses multiple types of polymers, whitening and phase separation become significant, which tends to reduce the mechanical strength of the stretched product. Even when using a resin composition as an essential component, the development of a manufacturing method that can efficiently improve mechanical properties and obtain a stretched resin body with excellent mechanical properties has been awaited.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for producing a stretched resin body that can have excellent mechanical properties.

[Disclosure of the invention]

In order to achieve the above objectives, the inventors have conducted repeated research. As a result, surprisingly, if the excipient of the resin composition is stretched or rolled within a temperature range from the temperature at which the benzene ring-containing polymer begins to soften but below the temperature at which flow occurs, and then rapidly cooled, the excipient becomes brittle. We have discovered that by cold-stretching the stretched or rolled product, it is possible to obtain a stretched resin product with excellent mechanical properties. completed this invention.

Therefore, the present invention provides a method of stretching or rolling a shaped body of a resin composition containing a polymer having a benzene ring as an essential component within a temperature range from the temperature at which the polymer begins to soften to below the temperature at which flow occurs, and then rapidly cooling it. Furthermore, the gist is a method for producing a stretched resin body that is cold-stretched.

The present invention will be explained in detail below.

The resin composition used in this invention contains at least one kind of polymer having a benzene ring. Here, as the polymer having a benzene ring, for example, polystyrene, polyphenylene oxide (PPO), methacrylate-styrene copolymer, methyl methacrylate-styrene copolymer, styrene-butadiene block copolymer (SBS), polyether sulfone, or needle Examples include polysulfone (polyphenylsulfone) such as (Udel) polysulfone, but are not limited to those listed here. Polyphenylene oxide is represented by the following formula (al).

Niederpolysulfone is represented by the following formula tb>.

For the purpose of improving the performance or changing the properties of the resulting resin stretched product, a type of polymer that does not contain a benzene ring, such as polymethyl methacrylate, may be used in combination, if necessary. In addition, so-called additives, such as antioxidants and ultraviolet absorbers, and fillers (
filler) etc. may be added to the resin composition for the purpose of improving the performance of the stretched resin body. On the other hand, first, primary stretching is performed. This stretching is carried out within a temperature range from the temperature at which the polymer having benzene rings begins to soften to below the temperature at which flow occurs. When two or more types of polymers having benzene rings are used, the temperature range is higher than the temperature at which the mixture starts to soften and lower than the temperature at which flow occurs. The higher the stretching speed is, the more preferable it is, and the higher the stretching ratio is, the more preferable it is.
The main purpose of the next stretching is to improve the fragility of the excipient of the resin composition by the subsequent rapid cooling, so it is not necessarily necessary to draw at high speed and at a high magnification. Specific stretching conditions vary depending on the type of polymer contained in the resin composition, etc., but in any case, conditions must be selected so that whitening does not occur.

Next, the stretched product is rapidly cooled. This rapid cooling is one of the features of this invention. The rapid cooling is performed by rapidly lowering the temperature to below the softening temperature while holding the stretched product before stress relaxation is completed. In this way, the brittleness of the shaped body of the resin composition is improved, and it becomes possible to cold stretch it.

Thereafter, the stretched product is subjected to secondary stretching to obtain a stretched resin body in the form of a film or fiber. Performing this secondary stretching is also one of the features of the present invention. The second stretching is cold stretching performed at a temperature below the softening temperature. Stretching temperature.

Stretching conditions such as magnification are appropriately selected according to the type of resin composition, etc., within a range that does not cause whitening.

Shaped bodies of resin compositions containing a polymer having benzene rings as an essential component are fragile and difficult to cold stretch as they are.
Moreover, although it is difficult to improve mechanical strength by stretching at a high temperature above the temperature at which it begins to soften, once a stretched product is produced in this way, the mechanical strength of the excipient can be effectively improved. This makes it possible to obtain a stretched resin body with excellent mechanical properties.

Note that instead of performing the primary stretching, the shaped body may be rolled within the same temperature range using a rolling method, and the obtained rolled product may be rapidly cooled. In the above description, films and fibers are used as excipients of the resin composition, and a stretched resin body in the form of a film or a fiber is obtained, but the present invention is not limited thereto. In the manufacturing method according to the present invention, stretching methods such as -axial stretching, biaxial stretching, dry stretching, and wet stretching can be used for stretching. When stretched resin bodies in the form of films or sheets are produced by the production method of the present invention, they can be used, for example, in the production of laminates and the like.

Next, Examples and Comparative Examples will be explained (Example 1) A resin composition consisting of 80 parts by weight of polyphenylene oxide (PPO) and 20 parts by weight of styrene-butadiene broth copolymer (SBS) was cast using a casting method. It was molded into a film-like body with a thickness of 150 pm. For this film-like body, the stretching temperature and the double speed ratio were 19, respectively.
0°C, 3.0 min-1 (min-'), 1.6
After the first stretching was performed under the following conditions, the stretched product was rapidly cooled while being held.

Furthermore, the stretching temperature and speed ratio were 20°C and 20°C, respectively.
The obtained stretched product was cold stretched (secondary) under the conditions of 1.5 minutes and 1.5 minutes to obtain a stretched resin body.

(Examples 2 to 5) The compositions shown in Table 1 were used as resin compositions, and the primary stretching and secondary stretching were carried out under the conditions shown in Table 1. Otherwise, a stretched resin body was produced in the same manner as in Example 1.

(Comparative Example 1) Using a film made in the same manner as in Example 1, primary stretching was performed under the same conditions as in Example 1, but without rapid cooling, the film was slowly cooled while being held. Next, an attempt was made to cold stretch the obtained drawn product, but this was impossible due to the brittleness.

(Comparative Example 2) A film was made in the same manner as in Example 1. This film was not subjected to any stretching or the like.

The mechanical strengths of the stretched resin bodies obtained in Examples 1 to 5 and the film obtained in Comparative Example 2 in terms of tensile strength, tensile modulus, and elongation were measured according to ASTM D638. The results are shown in Table 1.

From Table 1, the stretched resin body obtained in Example 1 has superior mechanical properties compared to the film obtained in Comparative Example 2, despite using the same resin composition. You can see that It can also be seen that the stretched resin bodies obtained in Examples 2 to 5 also have excellent mechanical strength.

[Effects of the Invention] The method for producing a stretched resin body according to the present invention is to prepare a shaped body of a resin composition containing a polymer having a benzene ring as an essential component at a temperature ranging from the temperature at which the polymer begins to soften to below the temperature at which flow occurs. Since the resin is stretched or rolled in a vacuum chamber, rapidly cooled, and further cold-stretched, a stretched resin body with excellent mechanical properties can be obtained.

Claims (1)

[Claims] (1) A shaped body of a resin composition containing a polymer having a benzene ring as an essential component is stretched or rolled within a temperature range from the temperature at which the polymer begins to soften to below the temperature at which flow occurs, and then quenched, and then cold-stretched. A method for producing a stretched resin body.