Polyurethane with polyether and polyester blocks and alkoxysilane end group
An alkoxysilane, polyester block technology, applied in the field of polyurethane, can solve the problems of insufficient, lack of green rubber strength, and the assembly cannot be operated comfortably.
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Embodiment 1
[0118] A) Preparation of polyurethanes according to the invention:
[0119] Step (i): Synthesis of a polyurethane comprising two -NCO end groups and one or more polyether blocks:
[0120] 38.96g of polyether polyols with a hydroxyl value of 13.5mg KOH / g (corresponding to -OH functional group equivalents equal to 0.241mmol / g) 8200N was added to a 250ml closed reactor equipped with stirrer, heating, thermometer and connected to a vacuum pump. The polyether polyol is dehydrated by heating the whole to 80° C. and maintaining a reduced pressure of 20 mbar for 1 hour.
[0121] 4.2 mg bismuth / zinc carboxylate catalyst ( Kat VP0244 from the company Borchers GmbH) and 2.95 g of isophorone diisocyanate (measured by titration - 37.6% w / w of NCO groups) (the amount so employed corresponds to an NCO / OH ratio equal to 2.8) were added to the reactor , and heated to 90°C. The polyaddition reaction was continued for 4 hours until 41.94 g of polyurethane were obtained with an -NCO content...
Embodiment 2-12
[0152] Example 1A) was repeated to prepare polyurethanes according to the invention:
[0153] - however, in step (i) is replaced by a mixture of alcohols comprising at least one polyether polyol (A) having the properties and constituent contents (% w / w) shown in Table 1 8200N,
[0154] - In step (ii), also replaced by a mixture of polyester polyols having the properties and ingredient contents (% w / w) shown in Table 1 7330, and
[0155] - For the NCO / OH ratios in steps (i) and (ii) the values shown in Table 1 are used.
[0156] The obtained values of melt viscosity, melting point and weight average molecular weight are shown in Table 2.
[0157] Example 1B) was repeated with each polyurethane thus obtained.
[0158] The test results obtained for the corresponding compositions are shown in Table 3.
Embodiment 13
[0159] Embodiment 13 (comparative example):
[0160] A MS polymer comprising two n-propyldimethoxymethylsilane end groups directly attached to a polypropylene glycol type backbone, available under the designation S 303H from Zhongyuan Corporation, was used.
[0161] A composition consisting of 99.8% of this polymer and 0.2% of the crosslinking catalyst from example 1B) was prepared by simple mixing and packed into aluminum canisters.
[0162] The test described in Example 1B) was then repeated and the results obtained are shown in Table 3.
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Abstract
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