Methods for use of aqueous polyurethane dispersions and articles made thereby
A water-based polyurethane and dispersion technology, applied in textiles and papermaking, improved handle fibers, fiber treatment, etc., can solve problems such as adhesives that do not have elastic characteristics and stretch/recovery characteristics
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example 1
[0092] Example 1: Prepolymer formulation without 1-hexanol
[0093] Use polytetramethylene ether glycol, aliphatic diisocyanates such as PICM (4,4'-methylenebis(cyclohexylisocyanate), a hydrogenated version of 4,4'-MDI) and Polyurethane prepolymers were prepared from diols that hindered carboxylic acid groups. More specifically, prepolymers were prepared using the following ingredients and unit quantities:
[0094] Table 2
[0095]
[0096] The reactions to prepare the prepolymers were performed in a moisture-free, nitrogen blanketed atmosphere to avoid side reactions.
[0097] A 30 gallon reactor with a heated water jacket and equipped with an agitator was used in this example. The reactor was heated to a temperature of about 55°C. melt the predetermined weight 1800 Diol was charged to the reactor. Then, with stirring and circulation, DMPA solid powder was added to the reactor under a nitrogen blanket until the DMPA solid particles were dispersed and dissolved in the ...
example 2
[0099] Example 2: Preparation of an aqueous polymeric dispersion with the prepolymer of Example 1
[0100] Dispersions were prepared by adding the prepolymer of Example 1 using a rotor / stator high speed disperser. The prepolymer prepared as in Example 1 was transferred directly into the disperser head and dispersed under higher shear into deionized water containing surfactants, neutralizers, antioxidants and foam control agents. Slightly more prepolymer than required by the dispersion formulation was required to compensate for losses in transfer lines and reactors.
[0101] The ingredients used to prepare the dispersion and the composition of the dispersion are shown in Table 3 below.
[0102] table 3
[0103]
[0104]
[0105] In making a typical batch of 100 kg of aqueous polymeric dispersion, Dowfax 2A1 surfactant (1.2652 kg), antioxidant Irganox 245 (0.6051 kg) and foam control agent BYK-012 (0.1265 kg) were mixed and dissolved in deionized water (54.8093kg). Tri...
example 3
[0112] Example 3: Preparation of prepolymer with 1-hexanol
[0113] Using polytetramethylene ether glycol, 1-hexanol, aliphatic diisocyanates such as PICM (4,4'-methylenebis(cyclohexylisocyanate), hydrogenated version of )) and diols containing sterically hindered carboxylic acid groups to prepare polyurethane prepolymers. Table 5 lists the ingredients and unit quantities used to make the prepolymers.
[0114] table 5
[0115]
[0116] The reactions to prepare the prepolymers were performed in a moisture-free, nitrogen blanketed atmosphere to avoid side reactions.
[0117] A 30 gallon reactor with a heated water jacket and equipped with an agitator was used in this example. The reactor was heated to a temperature of about 55°C. melt the predetermined weight 1800 Diol was charged to the reactor. 1-Hexanol was added again. Then, with stirring and circulation, DMPA solid powder was added to the reactor under a nitrogen blanket until the DMPA solid particles were disper...
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