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Lignin-containing polyurethane sealant and preparation method thereof

A polyurethane sealant and lignin technology, which is applied in polyurea/polyurethane adhesives, chemical instruments and methods, adhesives, etc., can solve the problems that polyurethane sealants are susceptible to ultraviolet light aging, and achieve improved thermal oxygen stability, Improves aging resistance and enhances the effect of tolerance

Inactive Publication Date: 2013-07-24
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a lignin-containing polyurethane sealant and a preparation method thereof in order to solve the technical problem that the existing polyurethane sealant is susceptible to ultraviolet light aging

Method used

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  • Lignin-containing polyurethane sealant and preparation method thereof

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specific Embodiment approach 1

[0020] Specific Embodiment 1: In this embodiment, the lignin-containing polyurethane sealant consists of 90-100 parts by mass of lignin-containing prepolymer, 0.2-0.5 parts of catalyst, 1-5 parts of latent curing agent, 30-60 parts Made of plasticizer and 30-50 parts of filler;

[0021] The lignin-containing prepolymer is made of 90-100 parts of polyether glycol, 5-80 parts of lignin and 20-70 parts of isocyanate in parts by weight;

[0022] The polyether diol is polyoxypropylene diol with a molecular weight of 1000-2000;

[0023] The lignin is corn stalk lignin;

[0024] The isocyanate is one or more of 2,4-toluene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, xylylene diisocyanate and isophorone diisocyanate combination.

specific Embodiment approach 2

[0025] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the catalyst is one or several of bismuth neododecanoate, zinc neododecanoate, dibutyltin dilaurate and stannous octoate combination. Others are the same as in the first embodiment.

[0026] When the catalyst described in this embodiment is a composition, the ratios between the respective components are arbitrary.

specific Embodiment approach 3

[0027] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the latent curing agent is oxazolidine. Others are the same as those in the first or second embodiment.

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Abstract

The invention discloses lignin-containing polyurethane sealant and a preparation method thereof, and relates to sealant and a preparation method thereof. In order to solve the technical problem that the existing polyurethane sealant is easily aged due to ultraviolet light, the lignin-containing polyurethane sealant is prepared from a lignin-containing prepolymer, catalyst, latent curing agent, plasticizer and filler. The preparation method of the lignin-containing polyurethane sealant comprises the following steps of: preparing the lignin-containing prepolymer; and stirring the lignin-containing prepolyer, the catalyst, the latent curing agent, the plasticizer and the filler for one hour at 80 DEG C to obtain the lignin-containing polyurethane sealant. After the ageing is quickened up by 1000 hours by the ultraviolet light, the fracturing elongation retention of the lignin-containing polyurethane sealant can reach 50%. The invention belongs to the preparation field of the sealant.

Description

technical field [0001] The invention relates to a sealant and a preparation method thereof. Background technique [0002] Polyurethane sealant is a sealant mainly composed of polyurethane rubber and polyurethane prepolymer. Polyurethane sealant has good tensile strength, excellent adhesion, elasticity, wear resistance, oil resistance, cold resistance and weather resistance, and is widely used in buildings, squares, roads as caulking sealing materials, as well as automobile manufacturing, Glass installation, electronic filling, sealing of submarines and rockets, etc. However, polyurethane sealants also have some disadvantages, such as long-term heat resistance; light-colored formulas are susceptible to UV aging; poor water resistance, especially alkali and water resistance. [0003] Lignin is a natural polymer material second only to cellulose in nature, and it is produced by 5×10 10 It can be regenerated at a speed of t and is an organic raw material with great industrial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J11/04C09J11/06C09K3/10C08G18/64C08G18/48C08G18/12
Inventor 邸明伟孔宪志
Owner NORTHEAST FORESTRY UNIVERSITY
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