Fluoropolymer compositions with scorch safety
A composition and polymer technology, applied in the field of fluoropolymer compositions, can solve problems affecting molding and physical properties, fluoroelastomers are unfavorable to scorch, and increase the viscosity of the composition, etc.
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[0096] Unless otherwise stated, all parts, percentages, ratios, etc. in the examples and in the rest of the specification are by weight, and all reagents used in the examples were obtained or can be obtained from general chemical suppliers (such as Sigma- Aldrich Company (Saint Louis, MO)), or can be synthesized by conventional methods.
[0097] These abbreviations are used in the following examples: g = gram, min = minute, mol = mole; mmol = millimole, phr = part per 100 parts of rubber, hr = hour, °C = degree Celsius, mL = milliliter, L = liter, psi = Pounds per square inch, MPa = Mega Pascal, N-m = Newton-meter.
[0098] The pKa values reported in some instances are from J.Chem.Soc., Perkin Trans.2, 699 (1989) and J.Chem. Soc., Perkin Trans.2, 521 (1990), which are based on organic acids in tetrachloride It is recorded in the form of dissociation constant in dilute solution of carbon dioxide. For the purposes of the present invention, pKa values are determined by meas...
example 1
[0130] Fluoropolymer A (300 g) was banded on a 6 inch two roll mill and allowed to mix for 2 to 3 minutes with the mill spacing set such that the polymer formed an adequate rubbery bank . The amount of Catalyst A shown in Table 1 was slowly added to the rubber stockpile over a period of about 2 minutes. Six transverse cuts (3 on each side) were performed over the course of about 3 to 4 minutes. The compound was then removed from the mill and the spacing was set to the tightest setting. The compound was then passed through the open mill at the tightest setting for 6 or 7 times without forming a belt, which took about 2 to 3 minutes. The compounds were again removed from the mill and allowed to cool for 5 to 10 minutes before testing.
example 2-3 and comparative example A-D
[0132] The examples were repeated by substituting the catalysts for Catalysts B (Example 2), C (Example 3), D (Comparative Example A), E (Comparative Example B) and F (Comparative Example C) as shown in Table 1 (below) 1. Comparative Example D uses MA as catalyst.
[0133] Table 1
[0134]
[0135] result
[0136]Rheological properties and scorch are shown in Tables 2 and 3, respectively.
[0137] About 9 g of the uncured, compounded sample was used for cure rheology testing using a Model 2000 Monsanto Moving Die Rheometer (MDR) rheometer sold by Monsanto Company (Saint Louis, MO) at 160°C , Time-consuming 10 minutes, under the condition of 0.5 degree arc in accordance with ASTM D 5289-93a. Determination of minimum torque (M L ) and maximum torque (M H ) (maximum torque achieved within a specified time period without reaching plateau or peak torque). Torque increases to ratios of M L The time taken to be 2 units higher (t s 2), the torque is equal to M ...
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