Single component surface decorative organic silicon sealing material and its preparation process and application

A sealing material and modification technology, which is applied in the field of one-component surface-modified silicone sealing materials, can solve the problem of high activity of amide crosslinking agent and primary amine group, which does not involve improving the coatability of latex paint, water-based latex Improve the poor effect of paint and other problems, achieve stable performance, improve storage stability, and excellent weather aging resistance

Active Publication Date: 2008-05-07
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, U.S.P.3542.714 proposes that the organic solution containing rosin resin is blended into ordinary silicon sealing materials, which can improve the coatability, but there is a problem of solvent pollution; Improve coatability, this patent also has solvent pollution and solvent volatilization and shrinkage, which reduces the adhesion between the sealant and the substrate; U.S.P.4358.558 proposes to add a linear or branched polysilicon containing basic nitrogen groups Oxane is used to improve the paintability, but the synthesis process is cumbersome and does not involve improving the paintability of latex paint; U.S.P.4515.834 is to add dialkoxy groups with amino and acyloxy functional groups in the amide crosslinking system Silane, amide cross-linking agent and primary amino group are highly active, and the product is prone to yellowing, high price, and strong taste; U.S.P.5338.574 proposes to add tung oil and amino-containing tackifier to the sealant, and the modified sealant has good oil compatibility. The improvement effect of alkyd paint is obvious, but the improvement effect of water-based latex paint is not good, and the storage stability is not very good after adding tung oil

Method used

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  • Single component surface decorative organic silicon sealing material and its preparation process and application
  • Single component surface decorative organic silicon sealing material and its preparation process and application
  • Single component surface decorative organic silicon sealing material and its preparation process and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025]100 parts of hydroxyl-terminated polydimethylsiloxane (25°C, 35,000cP), 100 parts of dry superfine activated calcium carbonate (produced by Hunan Jinxin Chemical Co., Ltd., particle size in 0.04-20μm) mixed in a mixer for 2-3 hours under vacuum airtight to obtain a uniform base rubber, then add 8 parts of methyl tributylketoximosilane and stir in vacuum for 8-15 minutes, then add 0.1 parts of dibutyl dibutyl Tin laurate, 2 parts of self-made modified silane coupling agent 6A or 7A, DL-602, KH-792, stirred for 5-10 minutes under vacuum airtight condition, after removing bubbles and some low molecular substances generated in the reaction, Keep airtight.

[0026] Apply the prepared silicone sealant evenly in a 2mm deep mold or a thin layer on the cured sealant without modifiers as a primer, and cure at room temperature for 2, 8, 24, 48 Hours later, evenly coat oil-based alkyd paint and polyurethane paint on it. After the coating was cured for 2 and 7 days, respectively, a...

Embodiment 2

[0061] Prepare the silicone sealant according to the method of Example 1, and add 1%, 2% and 3% of 6A respectively under the condition that other components remain unchanged, and test its surface coatability to the oil-soluble paint, as shown in Table 1 rating system to compare how well paint adheres to sealants. The test results are shown in Table 9 and Table 10.

[0062] The national standard GB / T 13477-92 was used for sample preparation and testing, and the silicone sealing material was made into an H-type sample, vulcanized and cross-linked for 28 days at 25°C and 50% RH, and its bonding strength to glass was tested. The group of samples is five samples, and the average test results are shown in Table 11.

[0063] Table 9 Effect of sealant on coatability of alkyd paint when adding different amounts of 6A

[0064]

[0065] Table 10 Effect of sealant on coatability of polyurethane paint when adding different amounts of 6A

[0066]

[0067] It can be seen from Table ...

Embodiment 3

[0072] Prepare the silicone sealant according to the method of Example 1. Under the condition that other components remain unchanged, add 3% methacryloylpropyltrimethoxysilane (trade name KH-570) to the system. Add 10-30% silicone acrylic latex to the acrylic latex paint to test its coatability on the surface of the water-soluble acrylic latex paint, and use the grade system in Table 1 to compare the degree of adhesion of the paint to the sealant.

[0073] Apply the prepared silicone sealant evenly on the mold with a depth of 2 mm and on the cured sealant without modifiers, and cure it at room temperature for 2, 8, 24, and 48 hours, and then apply it on it. Apply a mixture of water-soluble acrylic latex paint, silicone acrylic and oil-soluble acrylic enamel evenly. After the coating has cured for 2 days, 7 days, 18 days and 25 days respectively, determine the coatability of the coating to the surface of the sealant cured according to ASTM / D 3359-83 (Test method for pressure-se...

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Abstract

The invention discloses mono-component surface modificability organosilicon sealing material and its manufacturing method and using. Its components parts by weight are as follows: polyorganosiloxane 100, filling 50-150, cross-linking curing agent 3-10, catalyst 0.05-1, and modifier 1-3. Its manufacturing includes the following steps: adding 1-3 part silane coupler as modifier to improve oil solubility paint painting; adding 1-3 part silane coupler methacrylic acid acyl propyl lumiflavin oxygen group silane, and adding proper silicon abicin emulsion in water solubility acrylic latex coating to improve its surface modificability. The formed product can be used as basecoat to save cost; and it is convenient for construction.

Description

technical field [0001] The invention relates to a single-component surface-modified silicone sealing material and its preparation method and application. Background technique [0002] Room temperature vulcanized silicone rubber is a common sealant with excellent high and low temperature resistance, aging resistance, and ultraviolet resistance, and is widely used in the construction industry. However, silicone sealants have low surface energy and low surface tension, and generally do not infiltrate paints. Even with paint applied, the adhesion is very low and comes off very easily. This greatly limits its development in the decoration industry. [0003] There have long been patents describing how to improve the coatability of silicone sealing materials. For example, U.S.P.3542.714 proposes that the organic solution containing rosin resin is blended into ordinary silicon sealing materials, which can improve the coatability, but there is a problem of solvent pollution; Impr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/10C08L83/14
Inventor 郑强高传花林薇薇徐晓明陶小乐
Owner ZHEJIANG UNIV
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