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Polyurethane microcapsule dispersing agent preparation method and product thereof

A technology of polyurethane microcapsules and dispersions, which is applied to the preparation of microcapsule preparations and microspheres, can solve the problems of storage stability, centrifugal stability, dilution stability, poor acid and alkali resistance, etc., and achieve enhanced storage stability, excellent Storage stability, wide market value effect

Active Publication Date: 2017-04-26
TAICANG BAONI IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, when polyurethane wall materials are used in the preparation of microcapsules, they can usually bring advantages such as high elastic modulus, moderate hardness, and good water resistance. Therefore, in practice, the application of polyurethane microcapsule dispersions is very common; however, many Existing polyurethane microcapsule dispersions often show one or more poor defects in storage stability, centrifugal stability, dilution stability and acid and alkali resistance stability

Method used

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  • Polyurethane microcapsule dispersing agent preparation method and product thereof
  • Polyurethane microcapsule dispersing agent preparation method and product thereof
  • Polyurethane microcapsule dispersing agent preparation method and product thereof

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preparation example Construction

[0044] First aspect, provide a kind of preparation method of polyurethane microcapsule dispersion liquid, comprise the following steps:

[0045] S1: React excess polyisocyanate with hydroxyl-containing hydrophilic surfactant at 65-90°C for 2-4 hours under the catalysis of tetramethylethylenediamine to form polyurethane prepolymer;

[0046] S2: Reduce the temperature of the polyurethane prepolymer generated in S1 to 25-40°C, and stir and mix with the core material evenly to form an oil phase; add the oil phase to an aqueous polyvinyl alcohol solution, and homogeneously emulsify it to prepare Obtain O / W type emulsion;

[0047] S3: At 40-60°C, slowly add a polyamine aqueous solution to the O / W emulsion prepared in S2, after the dripping is completed, heat and cure for 1-2 hours, the wall material is completely formed, and the polyurethane is obtained microcapsule dispersion.

[0048] In a preferred embodiment, the hydroxylated hydrophilic surfactant is a polyhydroxy nonionic su...

Embodiment 1

[0084] Add 10.2g isophorone diisocyanate IPDI (Bayer, MaterialScience), 4.0g castor oil polyoxyethylene ether EL-40 (Jiangsu Haian Petrochemical Factory), 0.1g tetramethylethylenediamine (Sinopharm Reagent) to four In the bottle, after stirring at 80°C for 2.5h at a rotating speed of 800rpm, a polyurethane prepolymer was generated; the temperature of the polyurethane prepolymer was reduced to 35°C, and it was mixed with 70.0g 32# paraffin (Joule Wax Industry), 5.0g butyl acetate (National Medicine Reagent) is stirred and mixed uniformly to form an oil phase; then this oil phase is added to 199.0g of PVA (Sichuan Chuanwei Chemical) aqueous solution (wherein, the mass concentration of PVA in the whole dispersion system is 3.0 wt%), after stirring evenly, use a high-speed shearing disperser to homogenize for 5min with a rotating speed of 13000rpm, so that the oil phase is dispersed in the water phase, and an O / W type emulsion is obtained; the O / W type emulsion is transferred to fo...

Embodiment 2

[0087] 10.2g isophorone diisocyanate IPDI (Bayer, MaterialScience), 5.0g polyoxyethylene-polyoxypropylene copolymer Pluronic L64 (BASF), 0.1g tetramethylethylenediamine (Sinopharm Reagent) were added to the four ports In the bottle, after stirring for 3 hours at 75°C with a rotating speed of 800rpm, a polyurethane prepolymer was generated; the temperature of the polyurethane prepolymer was reduced to 25°C, and it was mixed with 8.0g of disperse dye Artelon Red SW-2B (Shanghai Yayun Textile Chemical Industry), 12.0g butyl acetate (Chinese Medicine Reagent) are stirred and mixed evenly to form an oil phase; then the oil phase is added to 253.0g of PVA (Sichuan Chuanwei Chemical) aqueous solution (wherein, PVA is in the whole dispersion system The mass concentration in the mixture is 2.5wt%), after stirring evenly, use a high-speed shear disperser to homogenize for 5min with a rotating speed of 8000rpm, so that the oil phase is dispersed in the water phase, and an O / W type emulsio...

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Abstract

The invention provides a polyurethane microcapsule dispersing agent preparation method and a product thereof. The preparation method comprises the following steps that excessive polyisocyanate and hydrophilic surfactant with a hydroxyl group is subjected to tetramethylethylenediamine catalytic reaction for 2-4 h at the temperature of 65-90 DEG C, and a polyurethane prepolymer is generated; the temperature of polyurethane prepolymer is lowered to be 25-40 DEG C, the polyurethane prepolymer is stirred and mixed with core materials to be uniform, and an oil phase is formed; the oil phase is added into a polyvinyl alcohol aqueous solution, homogeneous emulsification is conducted, and an O / W type emulsion is prepared; at the temperature ranging from 40 DEG C to 60 DEG C, a polyamine aqueous solution is slowly and dropwise added into the O / W type emulsion, after dripping is completed, heat preservation and curing are conducted for 1-2 h, and a polyurethane microcapsule dispersing agent is obtained. The polyurethane microcapsule dispersing agent has the excellent storage stability, dilution stability, centrifugal stability and acid and alkali resistant stability, harmful ingredients such as APEO, formaldehyde and aniline are not contained, and environmental protection is achieved; the polyurethane microcapsule dispersing agent preparation method and the product thereof have a wide application prospect and potential market value.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a preparation method of microcapsules, in particular to a preparation method of polyurethane microcapsule dispersion liquid and a product prepared by the preparation method. Background technique [0002] Microcapsule technology is a technology that completely encapsulates dispersed solids, liquids or gases in a dense shell to form microcapsules. Microcapsules have the functions of improving the stability of substances, isolating active ingredients, shielding odors, slowing release and targeting, and can be widely and effectively used in fields such as textiles, construction, medicine and food. [0003] The size of microcapsule particles is generally 1-1000 μm. In the dispersion system, microcapsule particles are usually in a metastable state, and aggregation between particles is easy to occur, which makes the storage stability of microcapsule emulsion or dispersion liquid poor. Mos...

Claims

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Application Information

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IPC IPC(8): B01J13/02B01J13/14
Inventor 吴倩顾喆栋
Owner TAICANG BAONI IND CO LTD
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