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A kind of polythiourethane resin composition and its application in optical material

A technology of resin composition and polythiourethane, applied in the direction of optics, optical components, instruments, etc., can solve the problems of optical unevenness of optical products, increased defective rate of products, streaks, etc.

Active Publication Date: 2021-04-20
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the reactivity of the modified component is stronger or weaker than that of the main component (isocyanate compound and thiol compound), it will often cause optical inhomogeneity in optical products, such as "streaks" or "fogging" on the surface. "Phenomenon; in addition, the addition of modified components may not match the production process under the existing technology, bringing the risk of increased product defect rate

Method used

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  • A kind of polythiourethane resin composition and its application in optical material
  • A kind of polythiourethane resin composition and its application in optical material
  • A kind of polythiourethane resin composition and its application in optical material

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0044] The preparation of aliphatic isocyanate adduct (J1) is carried out according to the following steps:

[0045] First, vacuum dehydrate TP200 at 110°C for 3.5h, control its water content to less than 0.05%, and wait for use; then, under the protection of nitrogen, add HDI into the reactor and stir to maintain the temperature at 50°C, and dehydrate the TP200 was added dropwise into the reactor under stirring condition, the dropping time was 3h, and the molar ratio of HDI to TP200 was 6:1; after the dropwise addition was completed, the reaction was continued at 70°C for 4h under stirring to obtain polyurethane prepolymerized things. Finally, the polyurethane prepolymer was transferred to a thin-film evaporator, and treated at 180° C. for 6 hours under the condition that the system pressure was less than 10 Pa.

[0046] The viscosity (25° C.) of the prepared adduct J1 is about 1200 mpa.s, the mass content of free isocyanate is about 1.0%, and the mass content of NCO is abou...

Embodiment 1

[0054] First, 45.0 parts by weight of 1,3-bis(isocyanatomethyl)cyclohexane, 0.050 parts by weight (500ppm) of UV absorber (BASF, Tinuvin329), 0.10 parts by weight (1000ppm) at 10-20°C Internal mold release agent (STEPAN, Zelec UN), 0.035 (350ppm) catalyst C1 (dibutyltin dichloride) in parts by weight were mixed and stirred for 20 minutes.

[0055] Next, 28.0 parts by weight of 2,3-bis(thio(2-mercaptoethyl))-1-n-propanethiol and 19.0 parts by weight of tetrakis(3-mercaptopropionic acid)pentaerythritol ester were added, mixed and stirred for 20 minutes. . Then, 8.0 parts by weight of J1 was added with stirring, and mixed for 20 minutes. At the same time, the composition was stirred and degassed for 30 minutes at a stirring speed of 100 rpm and a vacuum of 133 Pa.

[0056] Finally, the composition was filtered through a 1 μm Teflon filter.

[0057] Polythiourethane resin performance evaluation sample preparation:

[0058] Fill or inject the filtered composition into a special...

Embodiment 2-12 and comparative example 1-3

[0063]Referring to Example 1, the composition was formulated, and the composition of the composition is shown in Table 2.

[0064] Examples 2-12 and Comparative Examples 1-3 refer to Example 1, prepare test samples and lenses, and conduct tests. The results are shown in Table 3.

[0065] In Examples 1-12 and Comparative Examples 1-3, during the preparation of the composition, the compounds involved include,

[0066] HXDI: 1,3-bis(isocyanatomethyl)cyclohexane, Wanhua Chemical;

[0067] HDI: hexamethylene diisocyanate, Wanhua Chemical;

[0068] IPDI: isophorone diisocyanate, a product of Wanhua Chemical;

[0069] HMDI: 4,4'-dicyclohexylmethane diisocyanate, Wanhua Chemical;

[0070] DMPT: 2,3-bis(thio(2-mercaptoethyl))-1-n-propanethiol, Shandong Yifeng Company;

[0071] PETMP: tetrakis (3-mercaptopropionic acid) pentaerythritol ester, Shandong Yifeng Company;

[0072] DBC: dibutyltin dichloride, Bailingwei;

[0073] Tinuvin329: 2-(2'-hydroxy-5'-tert-octylphenyl)-benzotriaz...

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Abstract

The invention provides a polythiourethane resin composition and its application in optical materials. Using the composition to prepare polythiourethane resin for optical materials can effectively reduce optical unevenness or surface "fogging" and other undesirable phenomena . The present invention provides a polythiourethane resin composition, which comprises aliphatic isocyanate adducts, isocyanate compounds and mercaptan compounds; wherein, the adducts are aliphatic isocyanate and polyether polyols and the aliphatic isocyanate is selected from aliphatic isocyanates containing two isocyanate groups, and the polyether polyol is selected from polyoxyethylene polyols with hydroxyl functional groups ≥ 3 and polyoxyethylene / propylene oxide copolymers One or more combinations of ether polyols; the viscosity of the adduct is 200-2400mpa.s (25°C); the content of free isocyanate contained in the adduct is ≤3.0%.

Description

technical field [0001] The invention relates to a composition of polythiourethane resin and its application in optical materials. Background technique [0002] In recent years, polythiourethane resins have become more and more widely used in applications such as plastic lenses and prisms. Compared with traditional materials (such as allyl diglycolate, polymethylmethacrylate, etc.) ester and polycarbonate, etc.) show a clear balance of properties. [0003] The polythiourethane resin is obtained by polymerizing a composition containing at least isocyanate compounds and thiol compounds. The basic reaction of the curing and molding of the resin includes the chain extension reaction and the crosslinking reaction under the action of the polymerization catalyst. [0004] With the upgrading of the consumption level, the market puts forward higher requirements for plastic lens products, such as better safety and durability under harsh environmental conditions (such as high temperat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/38C08G18/75C08K5/3475C08K5/521G02B1/04
Inventor 刘振东王凯谢毓
Owner WANHUA CHEM GRP CO LTD