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Preparation method for core-shell fluorinated polyurethane-acrylate latex

A technology of acrylate and polyurethane is applied in the field of preparation of latex of elastic paint for exterior walls that is resistant to stains, can solve problems such as low grafting rate, etc., and achieve the effects of low preparation cost, excellent water resistance, and large water contact angle

Inactive Publication Date: 2013-02-13
江苏日出化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the hydrophobic and oleophobic characteristics of fluorine-containing acrylate, it is independent of the two phases of oil and water, and it is difficult for general surfactants to form effective micelles for it, resulting in a low grafting rate. Therefore, how to improve the efficiency of fluorine-containing acrylate monomer Grafting efficiency with acrylate-polyurethane composite latex is a key technical challenge

Method used

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  • Preparation method for core-shell fluorinated polyurethane-acrylate latex
  • Preparation method for core-shell fluorinated polyurethane-acrylate latex
  • Preparation method for core-shell fluorinated polyurethane-acrylate latex

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A preparation method of polyurethane emulsion, comprising the following steps:

[0032] Polyurethane (PU) preparation specific steps:

[0033] First, 89.5 grams of polyether diol (N-210) was placed in a vacuum distillation device, and dehydrated by distillation and dehydration at 100 ° C for 1 hour; then 84 grams of toluene diisocyanate (TDI) were added together to the , in a four-necked flask with a reflux condenser, prepolymerized at 90°C for 2h; cooled to 80°C, added 12.5 grams of 2,2-dimethylolpropionic acid (DMPA), 1.5 grams of trimethylolpropane (TMP) and 27 grams of 1,4 cyclohexanedimethanol (CX) for chain extension reaction, constant temperature reaction for 1 hour; add 8 grams of epoxy resin (E-51), 4 grams of hydroxyethyl methacrylate (HEMA), keep at 70 ° C Capping reaction for 4 hours; cooling to 40°C, adding triethylamine (TEA) for neutralization for 10 minutes; adding 165 grams of acetone to adjust the viscosity during the whole reaction process, adding 40...

Embodiment 2

[0035] Preparation of FPUA:

[0036] 0.8 grams of sodium alkylphenol polyoxyethylene sulfate, 0.4 grams of alkyl alcohol polyoxyethylene ether, and 0.2 grams of sodium 1-propenyloxy-2-hydroxypropane sulfonate, 24 grams of butyl acrylate (BA), 16 grams Methyl methacrylate (MMA), 0.3 gram of methacrylic acid, 0.8 gram of acrylic acid, 0.8 gram of acrylamide and 24 gram of water are emulsified at high speed (1000r / min) to obtain a stable pre-emulsion; take 12 grams of PU emulsion and add 0.19 gram The sodium bicarbonate solution is heated to 80°C, then the pre-emulsion and the initiator solution are added dropwise simultaneously, the temperature is controlled at (80±2°C), and the pre-emulsion is dripped in 3.5 hours; slowly drop 1 gram of fluorine-containing acrylate monomer (G04) and the remaining initiator solution, control the temperature at (80±2°C), drop it in 0.5 hours, raise the temperature to 85°C, continue polymerization for 1h, cool to 40°C, adjust the pH to 8-9 with am...

Embodiment 3

[0040] Preparation of polyurethane-acrylate latex (PUA):

[0041]0.8 grams of sodium alkylphenol polyoxyethylene sulfate, 0.4 grams of alkyl alcohol polyoxyethylene ether, and 0.2 grams of sodium 1-propenyloxy-2-hydroxypropane sulfonate, 24 grams of butyl acrylate (BA), 16 grams Methyl methacrylate (MMA), 0.3 gram of methacrylate, 0.8 gram of acrylic acid, 0.8 gram of acrylamide and 24 gram of water were emulsified at high speed (1000r / min) to obtain a stable pre-emulsion; take 12 grams of PU emulsion, add 0.19 gram of sodium bicarbonate solution is heated to 80°C, then synchronously drop the pre-emulsion and initiator solution, control the temperature at (80±2°C), drop the pre-emulsion in 3.5 hours, raise the temperature to 85°C, continue to polymerize for 1h, cool to 40°C, adjust the pH to 8-9 with ammonia water and discharge.

[0042] FPUA and PUA latex were respectively filmed on glass slides, and the water contact angle was measured. The results are as follows: figure ...

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Abstract

The invention relates to a preparation method for core-shell fluorinated polyurethane-acrylate latex. The method comprises the following steps: placing polyether glycol and toluene diisocynate into a stirrer to prepare polyurethane; and emulsifying an emulsifier, butyl acrylate, methyl methacrylate, a functional monomer and a proper amount of water at high speed to prepare the core-shell fluorinated polyurethane-acrylate latex. By the method, the defects that the fluorinated acrylate in the prior art is independent of oil and water phases due to hydrophobicity and lipophobicity, effective micelle is difficult to form by the general surfactant and the grafting ratio is low are overcome. The core-shell fluorinated polyurethane-acrylate latex has a core-shell structure and the fluorinated acrylate is enriched in the shell, so a latex film has a large water contact angle. The using amount of the fluorinated acrylate monomer (G04) is 1 to 2 percent of the weight of the monomer and the using amount of polyurethane (PU) is 10 percent of the weight of a composite latex solid, so the preparation cost is low. The emulsifier does not need a fluorine-containing surfactant, so the polymerization rate is high, the grafting efficiency of the fluorinated acrylate monomer is high and the latex is stored stably.

Description

technical field [0001] The invention relates to the field of preparation of a stain-resistant exterior wall elastic paint latex, in particular to a preparation method of core-shell fluorine-containing polyurethane-acrylate latex. Background technique [0002] Polyurethane is a polymer material containing -NH-C00- repeating units in the main chain, which has excellent wear resistance, elasticity, chemical corrosion resistance, room temperature curable, wide range of soft and hard adjustable and excellent mechanical properties It is widely used in coatings, adhesives, textile auxiliaries and other fields. However, most of the polyurethane materials used in the past are solvent-based, which not only pollutes the environment and is harmful to human health, but also increases the cost due to solvent loss. In recent years, with the enhancement of people's awareness of environmental protection and the introduction of various environmental protection regulations one by one, water-b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F220/22C08F220/18C08F220/14C08F220/06C08F2/26C08F2/30C09D151/08
Inventor 周松奎朱爱萍夏林存陆婷马忠林
Owner 江苏日出化工有限公司
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