Blowing agent blends for thermoplastic polymers
A thermoplastic polymer and foaming agent technology, applied in the field of thermoplastic polymer foaming agent, can solve the problems of unpopularity and destruction of stratospheric ozone
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Embodiment 1
[0157] Example 1. Solubility of HFO-1336mzz-Z / methyl formate blend in softened polystyrene homopolymer
[0158] This example demonstrates that Z-1,1,1,4,4,4-hexafluoro-2-butene (i.e. HFO-1336mzz-Z Z) / methyl formate blends show increased solubility in softened polystyrene.
[0159] The solubility of HFO-1336mzz-Z and HFO-1336mzz-Z / methyl formate blends containing 20% by weight methyl formate in softened polystyrene was determined by the following procedure: 78 g of polystyrene was loaded onto stainless steel in the reactor. The reactor was weighed, fitted into inlet / outlet pipes, immersed in an oil bath and evacuated. A HIP pressure generator (manufactured by High Pressure Equipment Company) was used to load the blowing agent in an amount in excess of its expected solubility into the evacuated reactor. The oil bath was heated and maintained at a temperature of 179°C for 30 minutes, after which the final pressure was recorded. Will The reactor was removed from the oil...
Embodiment 2
[0163] Example 2. Solubility of HFO-1336mzz-Z / methyl formate blend in softened polystyrene homopolymer
[0164] This example demonstrates that Z-1,1,1,4,4,4-hexafluoro- The solubility of 2-butene (ie HFO-1336mzz-Z) / HFC-152a / methyl formate blends in softened polystyrene was improved. Solubility analysis was performed according to the general procedure described in Example 1.
[0165] Such as figure 2 As shown, it was surprisingly found that HFO-1336mzz-Z / HFC-152a / methyl formate (for example 40% by weight / 40% by weight / 20% by weight and 33.33% by weight / 33.33% by weight / 33.33% by weight respectively) The ternary blends exhibited a solubility in softened polystyrene that significantly exceeded that of the binary blends of HFO-1336mzz-Z / HFC-152a (50% by weight / 50% by weight) under the same conditions.
[0166] For example, a 50 wt% / 50 wt% HFO-1336mzz-Z / HFC-152a blend is a softening polystyrene homopolymer with a melt flow index (MFI) of 5.0 g / 10 min at 179°C and 1,336 psia ...
Embodiment approach
[0168] 1. In some embodiments, the present application provides a method for preparing a thermoplastic polymer foam, the method comprising:
[0169] (a) providing a foamable composition comprising a thermoplastic polymer and a blowing agent, wherein the blowing agent comprises from about 95% by weight to about 1% by weight of Z-1,1,1,4,4,4- Hexafluoro-2-butene and from about 1% to about 95% by weight of methyl formate; and
[0170] (b) expanding the foamable composition to produce the thermoplastic polymer foam.
[0171] 2. The method of embodiment 1, wherein the solubility of the blowing agent in the polymer is greater than that of Z-1,1,1,4,4,4-hexafluoro-2-butene alone Solubility in the polymer.
[0172] 3. The method of embodiment 1 or 2, wherein the blowing agent comprises from about 75% to about 85% by weight of Z-1,1,1,4,4,4-hexafluoro-2-butane alkene.
[0173] 4. The method of embodiment 1 or 2, wherein the blowing agent comprises about 80% by weight Z-1,1,1,4,4,4-...
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