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Light-cured resin with low water absorption and preparation method thereof

A light-curing resin, low water absorption technology, applied in the field of light-curing materials, can solve the problems of poor product compatibility, poor control of the reaction, small molecular weight of the product, etc., and achieves a structure with regular structure, easy control and narrow molecular weight distribution. Effect

Inactive Publication Date: 2011-04-13
YANTAI DARBOND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are three main synthetic methods of existing silicone urethane acrylate: one is prepared by reacting dihydroxy silicone oil, diisocyanate and hydroxy acrylate; the other is prepared by reacting diamino silicone oil, diisocyanate and hydroxy acrylate; the third is Silane coupling agent, polyurethane macromolecule and acrylate monomer ternary emulsion copolymerization reaction; these synthetic methods have some problems: firstly, the product obtained by the reaction has poor compatibility and is difficult to be compatible with resins of other systems The second is that the reaction in the synthesis process is not well controlled. The reaction between the primary amino group of amino silicone oil and the NCO group is very violent, and it is difficult to control it stably; the third is that the synthesized product has a small molecular weight and a wide molecular weight distribution

Method used

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  • Light-cured resin with low water absorption and preparation method thereof
  • Light-cured resin with low water absorption and preparation method thereof
  • Light-cured resin with low water absorption and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 10g of γ-aminopropyltriethoxysilane (KH-550) and add it to 11g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane (KH-560) in a three-necked flask, mix well Then heat up to 70°C and react for 2 hours to obtain a modified silane chain extender containing secondary amino and hydroxyl functional groups, whose structural formula is:

[0031]

[0032] Among them, R 1 , R 2 , R 3 stands for CH 3 -, C 2 h 5 O- or CH 3 O-;

[0033] Vacuumize 100g of HTPB at 110°C (vacuum degree ≤ -0.08MPa) for 2 hours to remove the doped water; then cool down to 50°C, add 28.5g of TDI, and heat up to 85°C for 2 hours after the temperature is constant , and stop heating until the NCO content reaches the design value, that is, a polyurethane prepolymer with NCO groups at both ends is obtained, and its structural formula is: ,

[0034] Wherein, R represents toluene diisocyanate;

[0035] After mixing 100g of polyurethane prepolymer 1 and 5.6g of modified silane chain extender, react...

Embodiment 2

[0041]Weigh 10g of γ-aminopropyltriethoxysilane (KH-550) and add it to 11g of γ-(2,3-epoxypropoxy)propylmethyldimethoxysilane (WD-61) in a three-necked flask , after mixing evenly, heat up to 50°C and react for 3 hours to obtain a modified silane chain extender containing secondary amino and hydroxyl functional groups, which is the same as in Example 1;

[0042] Vacuumize 100g of HTPB at 100°C (vacuum degree ≤ -0.08MPa) for 3 hours to remove the doped water; then cool down to 60°C, add 24g of IPDI, and heat up to 80°C for 3 hours after the temperature is constant. Stop heating until the NCO content reaches the design value, and obtain polyurethane prepolymer 1 with NCO groups at both ends. Its structural formula is the same as that of Example 1, and R represents isophorone diisocyanate.

[0043] Mix 100g of polyurethane prepolymer 1 and 4.6g of modified silane chain extender, and react at 70°C for 3 hours to obtain polyurethane prepolymer 2 with NCO groups at both ends. Its st...

Embodiment 3

[0046] Weigh 10g of γ-aminopropylmethyldiethoxysilane (WD-57) and add it to 10g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane (KH-560) in a three-necked flask, After mixing evenly, heat up to 90°C and react for 1 hour to obtain a modified silane chain extender containing secondary amino and hydroxyl functional groups, which is the same as in Example 1;

[0047] Vacuumize 100g of HTPB at 115°C (vacuum degree ≤ -0.08MPa) for 1.5 hours to remove the doped water; then cool down to 40°C, add 31g of MDI, and heat up to 90°C for 1 hour after the temperature is constant. Stop heating until the NCO content reaches the design value, and obtain polyurethane prepolymer 1 with NCO groups at both ends. Its structural formula is the same as that of Example 1, and R represents diphenylmethane diisocyanate.

[0048] After mixing 100g of polyurethane prepolymer 1 and 4.9g of modified silane chain extender, react at 90°C for 1 hour to obtain polyurethane prepolymer 2 with NCO groups at both ends...

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Abstract

The invention relates to a light-cured resin with low water absorption and a preparation method thereof. The light-cured resin is silicane modified hydroxyl-terminated polybutadiene type urethane acrylate. The preparation method comprises the following steps of: 1) reacting an epoxy silicane coupling agent with a primary amine silicane coupling agent to generate a modified silicane chain extender; 2) reacting hydroxyl-terminated polybutadiene with diisocyanate to generate polyurethane prepolymer 1; 3) reacting the modified silicane chain extender with the polyurethane prepolymer 1 to generate polyurethane prepolymer 2; and 4) reacting the polyurethane prepolymer 2 with hydroxyl acrylate to generate the silicane modified hydroxyl-terminated polybutadiene type urethane acrylate.

Description

technical field [0001] The invention relates to a photocurable resin with low water absorption and a preparation method thereof, which is suitable for occasions requiring high water resistance and belongs to the field of photocurable materials. Background technique [0002] Light-curing materials have been widely studied due to their outstanding advantages such as fast curing speed, environmental friendliness, low energy consumption, and no solvent volatilization, and they are rapidly promoted in various industries. However, the light-curing materials of conventional polyurethane acrylates have their own limitations. In the occasions with high water resistance requirements, ordinary polyurethane acrylates are difficult to meet the requirements; the water absorption of conventional polyether-type polyurethane acrylates is greater than 1%. The water absorption of polyester urethane acrylate is greater than 2%, and in some occasions the water absorption is less than 0.5%, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/69C08G18/38C08G18/10
Inventor 潘光君王建斌陈田安
Owner YANTAI DARBOND TECH
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