JP-2026075059-A - Vinyl chloride resin molded product

Abstract

[Problem] In light of the fact that conventional polyvinyl chloride resin molded articles with sufficient heat resistance for products used outdoors for long periods of time have not existed, the objective is to provide a polyvinyl chloride resin molded article that is less prone to softening at high temperatures. [Solution] The extruded molded article 100 has a vinyl chloride resin as its main component and is configured such that its Vicat softening temperature is 103°C or higher. As a result, compared to general vinyl chloride resin molded articles, softening and deformation at high temperatures are less likely to occur, and the molded article 100 of the present invention has the advantage of having less impact on its structure even when used in a high-temperature environment. [Selection Diagram] Figure 1

Inventors

• 内田 喜一

Assignees

• フクビ化学工業株式会社

Dates

Publication Date

20260507

Application Date

20250930

Priority Date

20241021

Claims (7)

1. An extruded molded article having a vinyl chloride resin as its main component, A vinyl chloride resin molded article characterized by having a Vicat softening temperature of 103°C or higher.
2. Contains cross-linked polyvinyl chloride resin, The vinyl chloride resin molded article according to claim 1, characterized in that the proportion of gel-like cross-linked vinyl chloride resin in the total cross-linked vinyl chloride resin is 15% by mass to 60% by mass.
3. A vinyl chloride resin molded article according to claim 1 or 2, characterized in that the shrinkage rate per unit length after being left in a 90°C environment for 24 hours is 1.5% or less.
4. A vinyl chloride resin molded article according to claim 1 or claim 2, characterized in that the specular gloss at an incident angle of 60 degrees is 20% or less.
5. A vinyl chloride resin molded article according to claim 1 or claim 2, characterized in that the Charpy impact strength is 10 kJ/ m² or more.
6. A co-extruded molded article formed by stacking multiple layers of polyvinyl chloride resin molded articles, It consists of an inner layer and a surface layer which is a design layer thinner than the aforementioned content. A vinyl chloride resin molded article characterized in that either or both of the surface layer and the inner layer are vinyl chloride resin molded articles according to claim 1 or claim 2.
7. The vinyl chloride resin molded article according to claim 6, characterized in that the surface layer has a specular gloss of 20% or less at an incident angle of 60 degrees.

Description

This invention relates to a polyvinyl chloride resin molded article with excellent heat resistance. Traditionally, polyvinyl chloride resins have been used in a wide range of applications, including machinery, electrical products, vehicles, and building materials, due to their excellent chemical and oil resistance, adjustable hardness, and low cost. For example, in the field of architecture, polyvinyl chloride resin is used for window frames to improve the thermal insulation of buildings. Furthermore, due to its good weather resistance, it is also used in outdoor applications such as decking materials. In the automotive sector, it is sometimes used for exterior molding materials, etc. However, typical polyvinyl chloride resins are susceptible to temperature changes in their physical properties. They become brittle at low temperatures, but deform and lose strength at high temperatures. Furthermore, shrinkage at high temperatures can occur, sometimes causing structural problems. Therefore, to use these materials in components that reach high temperatures or in products exposed to the outdoors or sunlight, measures are taken to improve their physical properties with additives or to modify their structure. For example, a technology has been developed to create heat-resistant vinyl chloride resin compositions by adding heat-resistant enhancers to vinyl chloride resins, thereby increasing the Vicat softening temperature. Patent Document 1 discloses a technology relating to a vinyl chloride resin composition in which a vinyl chloride resin is added, a copolymer of a vinyl chloride resin and maleimide (maleimide), and a crosslinked acrylic rubber-based impact-resistant modifier. This vinyl chloride resin composition is said to be able to improve the flexibility temperature (corresponding to the Vicat softening temperature). Japanese Patent Application Publication No. 181853/1983 These are perspective views and cross-sectional views illustrating a vinyl chloride resin molded article of the present invention.This is a cross-sectional view showing a vinyl chloride resin molded article in Modification 1 of the present invention.This is an explanatory diagram illustrating the test method for heat shrinkage testing. Embodiments for carrying out the present invention will be described below with reference to Figure 1. Please note that each diagram is a schematic representation for illustrative purposes, and dimensions and shapes may be exaggerated or simplified in some cases. The vinyl chloride resin molded article (hereinafter also simply referred to as "molded article") 100 of the present invention is a molded article formed by extrusion molding, as shown in Figure 1, and is a molded article having the same cross-sectional shape in the longitudinal direction. The example in Figure 1 shows a molded product used for outdoor decking, but its applications are not limited to this. It can be used for components used in high-temperature environments, such as those exposed to direct sunlight, including building decking and jointing materials, and exterior molding materials for automobiles. The molded article 100 of the present invention is a single-layer extruded article made of the same resin. Its specific composition can vary, but for example, additives such as heat-resistant enhancers, reinforcing agents, and matting agents can be added to the main material, which is a vinyl chloride resin. For the main material, a vinyl chloride-based resin molded article, examples of materials that can be used include vinyl chloride homopolymers, vinyl chloride-ethylene copolymers, vinyl chloride-vinyl acetate copolymers, and acrylic rubber-modified vinyl chloride resins. For example, α-methylstyrene resins and N-phenylmaleimide resins can be used as heat resistance improvers. Reinforcing agents such as methyl methacrylate-butadiene-styrene copolymer (MBS) and acrylic elastomers can be used. The amount of reinforcing agent added can be between 1 and 20 parts by weight per 100 parts by weight of the main vinyl chloride resin. Cross-linked polyvinyl chloride resin and cross-linked acrylic resin can be used as the matting agent. The amount added can be between 10 and 70 parts by weight of the matting agent per 100 parts by weight of the main polyvinyl chloride resin. The cross-linked polyvinyl chloride resin in the matting agent can be made into a gel by adjusting the cross-linking density. In this invention, gel-like cross-linked polyvinyl chloride resin can also be added. The addition ratio can be 15% to 60% by mass of the gel-like cross-linked polyvinyl chloride resin relative to the total cross-linked polyvinyl chloride resin, preferably 15% to 30% by mass. In addition to the above, the present invention may also include fiber-based fillers, heat stabilizers, lubricants, mold release agents, fillers, external lubricants, processing aids, impact modifiers, antioxidants, light stabilizers, UV absorbers, pigments, plasticizers, and the like.