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Release agent for waterborne polyurethane molding flexible foam and preparation method thereof

A technology of water-based polyurethane and release agent, which is applied in the field of release agent for water-based polyurethane molding soft foam, can solve the problems of poor metal adhesion, low solid content, and good cohesion, and achieve low cost and high solid content , good adhesion effect

Inactive Publication Date: 2014-04-30
苏州井上高分子新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of the existing water-based release agents such as poor storage resistance, low solid content, and poor adhesion to metals, the invention discloses a release agent for water-based polyurethane molded flexible foam, the solid content of which is High, good film formation, good adhesion to metal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh the following raw materials:

[0031] Polyester polyol PBA2000 20g

[0032] Polyether polyol N220 80g

[0033] Isocyanate IPDI 33.5g

[0034] Dimethylolpropionic acid DMPA 6g

[0035] Triethylamine 3g

[0036] Ethylenediamine 0.1g

[0037] Catalyst T-120 0.03g

[0038] Polyethylene wax 45g

[0039] Deionized water 187g

[0040] T-7551 0.2g

[0041] making process:

[0042] Step a, dehydration of polyester PBA2000, polyether polyol N220, DMPA and polyethylene wax

[0043] Add PBA2000, N220, DMPA and polyethylene wax to a dry and clean 500mL three-necked flask equipped with a stirrer and a thermometer, and dehydrate under reduced pressure at 110°C and 0.08MPa for 2 hours;

[0044] Step b, prepolymerization reaction

[0045] cool down to 60 o C, slowly add 33.5g IPDI, a drop of T-120 in the flask, measure the content of -NCO group in the prepolymer after reacting 2h, until approaching the theoretical value;

[0046] Step c, making dispersion

[0047] 18...

Embodiment 2

[0051] Weigh the following raw materials:

[0052] PBA2000 10g

[0053] KGF2000MD 80g

[0054] N330 20g

[0055] HDI 35.5g

[0056] DMPA 8g

[0057] Polyethylene wax 80g

[0058] Deionized water 210g

[0059] Triethylamine 7g

[0060] Ethylenediamine 0.12g

[0061] T-120 0.03g

[0062] BYK-024 0.25g

[0063] Step a, dehydration of polyester, polyether polyol, DMPA and polyethylene wax

[0064] Add PBA2000, KGF2000MD, N330, DMPA and polyethylene wax 80g to a dry and clean 500mL three-neck flask equipped with a stirrer and a thermometer, and dehydrate under reduced pressure at 110°C and 0.08MPa for 2h;

[0065] Step b, prepolymerization reaction

[0066] cool down to 60 o C, slowly add 35.5g HDI, one drop of T-120 to the flask, measure the content of -NCO group in the prepolymer after reacting for 2h, until close to the theoretical value;

[0067] Step c, making dispersion

[0068] Neutralize 210 g of deionized aqueous solution in which triethylamine is dissolved and...

Embodiment 3

[0072] (1) Determination of solid content of release agent

[0073] Measured according to the provisions of GBl725-79. Take a dry watch glass and weigh m, then use the subtraction method to weigh m 0 =1.5-2.0g polymer emulsion is spread in a watch glass and placed in an oven for 60 o C to dry for 24 hours, take it out and cool it to room temperature, weigh it, and then put it in an oven to dry until the weighing difference does not exceed 0.01g, and the final stable mass is m 1 .

[0074] Solid content=m 1 -m / m 0 ×100%

[0075] After testing, the solid content of the polyurethane emulsion in Example 1 was 50%.

[0076] (2) Determination of storage stability

[0077] Add 50mL of the release agent prepared in Example 1 into a colorimetric cell with a stopper, place it in a constant temperature drying oven at 70±3°C for 3h, take it out and cool it to room temperature (15°C~35°C), place it for 3h, and then place it again Store in a low-temperature refrigerator at -12±3°C f...

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Abstract

The invention provides an externally used release agent for waterborne polyurethane molding flexible foam and a preparation method thereof. The release agent for waterborne polyurethane molding flexible foam comprises the following components: 0-30 parts of polyester polyol, 10-60 parts of polyether polyol, 30-80 parts of wax, 15-30 parts of isocyanate, 1-5 parts of chain extender, 1-8 parts of dimethylolpropionic acid, 1-7 parts of triethylamine, 0.05-0.15 part of amine chain extender, 0-0.15 part of catalyst, 0.05-0.15 part of defoaming agent and 50-200 parts of deionized water. The invention also discloses a preparation method of the externally used release agent for waterborne polyurethane molding flexible foam. The release agent for waterborne polyurethane molding flexible foam has good storage stability, relatively high solid content, good film forming property and better adhesive force with metal abrasive tools, thus greatly increasing the demolding times. The preparation method is simple in process, is relatively low in cost, is free from any organic solvent and is low-carbon and environment-friendly.

Description

technical field [0001] The invention relates to a release agent and a preparation method thereof, in particular to a release agent for water-based polyurethane molded flexible foam. Background technique [0002] Polyurethane release agents are divided into two types: external release agents and internal release agents. In order to make the product easy to take out from the mold during the molding process, a layer of paint coated on the surface of the mold is called an external release agent. The internal mold release agent is added to the PU formula, and it migrates to the interface between the foam and the mold during each molding, so as to achieve the mold release effect. [0003] An ideal release agent should have good thermal and chemical stability, not corrode the mold, and no decomposition products remain on the surface of the mold. It should be able to give the product a good appearance without affecting the color, adhesion, and durability of the product. Paint abil...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/34C08G18/32
CPCC08G18/0823C08G18/12C08G18/4018C08G18/6625C08G2110/0083C08G18/3228
Inventor 李超群
Owner 苏州井上高分子新材料有限公司