Molding compositions containing modified polybutylene terephthalate (PBT) random copolymers derived from polyetheylene terephthalate (PET)
A technology of polyethylene terephthalate and polybutylene terephthalate, applied to modified polyethylene terephthalate (PET) containing modified polyethylene terephthalate (PET) The field of molding compositions of butanediol ester (PBT) random copolymers can solve problems such as inability to manufacture and lack of PBT
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[0201] Material
[0202] A list of ingredients used in the examples of the present invention is given below.
[0203]
[0204]
[0205] method 1:
[0206] At a barrel and die temperature of 240-265° C., with a screw speed of 150-300 rpm, the ingredients of the examples shown in the table below were mixed in a 40 mm Werner Pfleiderer twin with vacuum vented mixing screw. extruded on a screw extruder. The extruder has 8 separate feeders for different raw materials and the extruder is capable of operating at a maximum rate of 300 lbs / hr (136 kg / hour). The extrudate was cooled by a water bath and pelletized. The test parts were injection molded on a van Dorn molding machine set at a temperature of about 240-265°C. The pellets were dried in a forced air circulation oven at 120°C for 3-4 hours prior to injection molding.
[0207] Method 2:
[0208] The ingredients of the examples shown in the table below were extruded on a 37 mm Toshiba TEM-37BS twin-screw extruder with ...
Embodiment 1 and 2
[0221] The aging test method of embodiment 1 and 2
[0222] Tensile bars molded from the molding compositions shown in Table 3 (including Examples 1 and 2) were placed in containers loaded in an autoclave chamber set at 110°C and 100% relative humidity . Five strips of each example were removed from the chamber at each time period of 1, 3 and 7 days from the start of exposure. The bars were then subjected to a tensile test and the percent retention calculated, given as a percentage of Comparative Example 2 relative to that of Example 1.
[0223] The following examples illustrate the invention but are not intended to limit the scope of the invention. The examples in the table below were all extruded and molded according to the method shown in Table 2.
[0224] Table 2: Extrusion methods for different samples
[0225] Example
[0226] All components are listed in % by weight.
Embodiment 1 and comparative example 2
[0228] Purpose - There are 5 purposes for these examples. First, these examples show that useful molding compositions can be prepared from PET-derived PBT. The properties of these compositions are comparable to those of pure PBT derived from dimethyl terephthalate. Second, these examples also demonstrate that the properties of formulations comprising epoxy resin and PET-derived PBT are comparable to those of formulations comprising epoxy resin and neat PBT derived from dimethyl terephthalate. Third, these examples will also demonstrate that, when hydrolytically aged for various periods of time, the properties of compositions containing epoxy resin and PET-derived PBT are comparable to those comprising epoxy resin and pure PBT derived from dimethyl terephthalate. Those formulations are comparable. Fourth, a lower amount of energy is consumed in producing these examples compared to DMT-based PBT. Energy here refers to the non-renewable energy used in preparing the molding com...
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Abstract
Description
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