0086-573-87811173

News

Home / News / PVC BACKGROUND TECHNOLOGY

PVC BACKGROUND TECHNOLOGY

Author: admin / 2021-12-29

For many years, rigid polyvinyl chloride (pvc) formulations have been used to manufacture products such as PVC Vinyl siding, window profiles, cover profiles, fences and railings. These products are usually limited to lighter colors, such as white, off-white, beige or light green, blue and yellow, but usually do not provide dark and dark colors. The reason for being limited to light colors is that these formulations can exceed the glass transition temperature (tg) and heat distortion temperature (hdtul) of hard pvc formulations due to high temperature and absorption of the infrared part of the solar spectrum.

  Manufacturers of these products have to limit their designs and color offerings to reduce the distortion of these products. Or they try to use materials such as α-methylstyrene acrylonitrile copolymer (amsan) to increase the tg and hdtul of pvc formulations. These options have disadvantages and often limit the geographic areas where these products can be used, or they create processing and product defects that must be addressed. For example, amsan causes decreased thermal stability, increased yellowing, and loss of impact properties. In the present disclosure, it has been surprisingly discovered that certain polycarbonate resins and high tg copolyester compositions are melt-processable at typical hard pvc processing temperatures without adversely affecting the processing properties, and They increase tg and hdtul without loss of impact properties.

  Summary of the invention

  The polyvinyl chloride composition of the present disclosure includes at least one polyvinyl chloride resin, at least one polycarbonate resin, and at least one copolyester resin.

  One embodiment of the present disclosure is a polyvinyl chloride composition comprising at least one polyvinyl chloride resin, at least one polycarbonate resin, and at least one copolyester resin, the copolyester resin comprising:

  (a) Dicarboxylic acid component, which comprises:

  (i) about 90 to about 100 mole% of terephthalic acid residues;

  (ii) about 0 to about 10 mol% of aromatic and/or aliphatic dicarboxylic acid residues having up to 20 carbon atoms; and

  (b) The glycol component, which comprises:

  (i) about 20 to about 60 mol% of a modified diol containing 2-20 carbon atoms, and

  (ii) about 40 to about 80 mol% of the second modified diol containing 2-20 carbon atoms,

  Wherein the total mole% of the dicarboxylic acid component is 100 mole %, and where the total mole% of the diol component is 100 mole %.

  One embodiment of the present disclosure is a polyvinyl chloride composition comprising at least one polyvinyl chloride resin, at least one polycarbonate resin, and at least one copolyester resin, the copolyester resin comprising:

  (a) Dicarboxylic acid component, which comprises:

  (i) about 50 to about 100 mole% of terephthalic acid residues;

  (ii) about 0 to about 50 mole% of aromatic and/or aliphatic dicarboxylic acid residues having up to 20 carbon atoms; and

  (b) The glycol component, which comprises:

  (i) about 60 to about 100 mol% of modified diols containing 2-20 carbon atoms; and

  (ii) about 0 to about 40 mol% of the second modified diol containing 2-20 carbon atoms;

  Wherein the total mole% of the dicarboxylic acid component is 100 mole %, and where the total mole% of the diol component is 100 mole %.

  In one embodiment, the tg of the copolyester is at least about 90°C or higher.

  In one embodiment, the tg of the copolyester is at least about 100°C or higher.

  In one embodiment, the copolyester is amorphous.

  In one embodiment, the half crystallization time of the copolyester is about 5 minutes or more.

  In one embodiment, based on the content of the pvc resin in the composition, the content of the copolyester resin in the pvc composition is about 1 to about 100 parts per hundred parts of resin (phr).

  In one embodiment, based on the content of the pvc resin in the composition, the content of the polycarbonate resin in the pvc composition is about 1 to about 50 parts per hundred parts of resin (phr).

  In one embodiment, based on the content of the pvc resin in the composition, the content of the polycarbonate resin in the pvc composition is about 1 to about 50 parts per hundred parts of resin (phr), and the content of the copolyester resin is about 1 To about 100 parts per hundred parts of resin (phr).

  In one embodiment, the polyvinyl chloride composition is rigid.

  In one embodiment, the polyvinyl chloride resin is polyvinyl chloride resin, chlorinated polyvinyl chloride resin or alloys thereof.

  In one embodiment, the polycarbonate resin is a bisphenol-based polycarbonate resin.

  The composition of claim 1 or 2, wherein the ratio of polyvinyl chloride resin: copolyester based on weight fraction is greater than about 1.

  The composition of claim 1 or 2, wherein the ratio of polyvinyl chloride resin: copolyester and polycarbonate based on a weight fraction is greater than about 1.

  An embodiment of the present disclosure is a method for producing a polyvinyl chloride composition, comprising: extruding at least one polyvinyl chloride resin composition, at least one polycarbonate resin, and at least one copolyester to produce a thermoplastic material A viscous blend of the copolyester comprising:

  (a) Dicarboxylic acid component, which comprises:

  (i) about 90 to about 100 mole% of terephthalic acid residues;

  (ii) about 0 to about 10 mol% of aromatic and/or aliphatic dicarboxylic acid residues having up to 20 carbon atoms; and

  (b) The glycol component, which comprises:

  (i) about 20 to about 60 mol% of a modified diol containing 2-20 carbon atoms, and

  (ii) About 40 to about 80 mol% of the second modified diol containing 2-20 carbon atoms, wherein the total mol% of the dicarboxylic acid component is 100 mol%, and wherein the total mol% of the diol component % Is 100 mol%,

  The blend of thermoplastic materials is introduced into the calendering, extrusion or injection molding process to produce polyvinyl chloride products.

  An embodiment of the present disclosure is a method for producing a polyvinyl chloride composition, comprising: extruding at least one polyvinyl chloride resin composition, at least one polycarbonate resin, and at least one copolyester to produce a thermoplastic material A viscous blend of the copolyester comprising:

  (a) Dicarboxylic acid component, which comprises:

  (i) about 50 to about 100 mole% of terephthalic acid residues;

  (ii) about 0 to about 50 mole% of aromatic and/or aliphatic dicarboxylic acid residues having up to 20 carbon atoms; and

  (b) The glycol component, which comprises:

  (i) about 60 to about 100 mol% of modified diols containing 2-20 carbon atoms; and

  (ii) about 0 to about 40 mol% of the second modified diol containing 2-20 carbon atoms;

  Where the total mole% of the dicarboxylic acid component is 100 mole %, and where the total mole% of the diol component is 100 mole %,

  The blend of thermoplastic materials is introduced into the calendering, extrusion or injection molding process to produce polyvinyl chloride products.

  We are a PVC wall panel manufacturers, welcome to visit our company!