Process for rapid polymerization preparation of polymethyl methacrylate used for polymer fiber
A technology of polymethyl methacrylate and methyl methacrylate, which is applied in the field of high light-transmitting polymer materials, can solve the problems of PMMA degradation, increased POF non-inherent loss, deterioration of overall mechanical properties, etc., and achieves accelerated polymerization speed. , The effect of preventing temperature rise and shortening polymerization time
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[0019] According to the technical scheme of the present invention, the rapid polymerization preparation method of PMMA for polymer optical fiber comprises the following steps:
[0020] Raw materials:
[0021] Monomer: high-purity MMA; initiator: high-purity azobisisobutyronitrile (AIBN) or dibenzoyl peroxide (BPO); chain transfer agent: high-purity dodecyl mercaptan or n-butyl mercaptan; parts by mass Number MMA=100, AIBN or BPO 0.1%-0.7%; high-purity dodecanethiol or n-butanethiol 0.1%-0.9%, each raw material is prepared in proportion to the reaction material mixture before polymerization.
[0022] Aggregation:
[0023] The polymerization device consists of a reactor, a cold trap, and a vacuum pump (shown in the attached figure 1 ), operations such as heating, cooling, decompression, and temperature measurement can be easily carried out, and samples can be taken to measure the conversion rate of MMA monomer.
[0024] The whole aggregation process can be divided into 4 sta...
Embodiment 1
[0032] The monomer high-purity methyl methacrylate mass fraction is 100 parts, when the initiator selects high-purity azobisisobutyronitrile (AIBN) for use, and when the consumption is 0.1%, the chain transfer agent selects high-purity dodecanethiol or n-Butanethiol, when the dosage is 0.9%, the initial reaction temperature T 1 Be 80 ℃, measure the conversion rate of reaction once every 10min, when conversion rate reaches 20% (reaction carries out about 50min), stop heating, start decompression evaporation about 10min, the MMA that evaporates accounts for about 20wt% of MMA total amount, At this time, the internal temperature of the material drops to T 2 It is about 45°C (related to the ambient temperature), and then heated to the later reaction temperature T 3 65°C, keep it warm for 1h until the conversion rate is about 80%, continue to raise the temperature to 120°C, keep it warm for 0.5h, and then solidify after completion to end the reaction. Then the whole polymerizatio...
Embodiment 2
[0034]The mass fraction of high-purity methyl methacrylate monomer is 100 parts. When the initiator is selected from high-purity azobisisobutyronitrile (AIBN), and the consumption is 0.3%, the chain transfer agent is selected from high-purity dodecanethiol or n- Butanethiol, when the dosage is 0.7%, the initial reaction temperature T 1 Be 80 ℃, measure the conversion rate of reaction every 10min, when conversion rate reaches 20% (reaction carries out about 30min), stop heating, start decompression evaporation about 10min, the MMA that evaporates accounts for about 20wt% of MMA total amount, At this time, the internal temperature of the material drops to T 2 It is about 45°C (related to the ambient temperature), and then heated to the later reaction temperature T 3 50°C, keep it warm for 2 hours until the conversion rate is about 80%, continue to raise the temperature to 120°C, keep it warm for 0.5h, and then solidify after completion to end the reaction. Then the whole polym...
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