Single-component polyurethane sealant prepared by using PAPI
A polyurethane sealant, one-component technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problem that polyurethane prepolymers cannot meet the use characteristics of polyurethane sealants and polyurethane waterproof coatings.
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Embodiment 1
[0028] A kind of single-component polyurethane sealant prepared by PAPI, its composition and specific processing method are as follows:
[0029]
[0030] Wherein, the molecular weight of the first polyoxypropylene glycol is 5000, the molecular weight of the second polyoxypropylene glycol is 2000, the ultraviolet absorber is UV531 of BASF chemical, and the antioxidant is TINUVIN-B75 of BASF chemical, latent curing The thixotropic agent is ALT-401 from Elite Chemical, the thixotropic agent 1 is hydrophobic fumed silica R974 from Degussa Chemical, and the thixotropic agent 2 is organic bentonite SD-2 from Hemings Chemical.
[0031] In this embodiment, the one-component polyurethane sealant is prepared by the following method:
[0032] Step 1: Add the formula amount of the first polyoxypropylene diol and plasticizer into the mixer, stir at a temperature of 110-120°C and vacuumize and dehydrate, keeping the vacuum degree ≤ -0.09Mpa, to be tested When the moisture content is ≤0....
Embodiment 2
[0038] A kind of single-component polyurethane sealant prepared by PAPI, its composition and specific processing method are as follows:
[0039]
[0040]
[0041] Wherein, the molecular weight of the first polyoxypropylene glycol is 8000, the molecular weight of the second polyoxypropylene glycol is 1000, the ultraviolet absorber is UV1260 of BASF chemical, the antioxidant is TINUVIN-B75 of BASF chemical, latent curing The agent is CH-2 from Cenhao Chemical, and the thixotropic agent is Crayvallac SLX from Crayvallac Company in France.
[0042] In this embodiment, the one-component polyurethane sealant is prepared by the following method:
[0043] Step 1: Add the formula amount of the first polyoxypropylene diol and plasticizer into the mixer, stir at a temperature of 110-120°C and vacuumize and dehydrate, keeping the vacuum degree ≤ -0.09Mpa, to be tested When the moisture content is ≤0.005%, lower the temperature to 60-65°C, add 50% of the formula amount of PAPI, keep t...
Embodiment 3
[0049] A kind of single-component polyurethane sealant prepared by PAPI, its composition and specific processing method are as follows:
[0050]
[0051]
[0052] Wherein, the molecular weight of the first polyoxypropylene glycol is 6000, the molecular weight of the second polyoxypropylene glycol is 1000, the ultraviolet absorber is UV1260 of BASF chemistry, and the antioxidant is tetrakis [β-(3,5- Di-tert-butyl-4-hydroxyphenyl)propionic acid] pentaerythritol ester, the latent curing agent is CH-2 of Cenhao Chemical Industry, and the thixotropic agent is Crayvallac SLX of Crayvallac Company in France.
[0053] In this embodiment, the one-component polyurethane sealant is prepared by the following method:
[0054] Step 1: Add the formula amount of the first polyoxypropylene diol and plasticizer into the mixer, stir at a temperature of 110-120°C and vacuumize and dehydrate, keeping the vacuum degree ≤ -0.09Mpa, to be tested When the moisture content is ≤0.005%, lower the ...
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