Defect Analysis and Processing in Preproduction of Composite Polyurethane-Based Insulation Coating for Pipeline

Abstract

Abstract:

Composite polyurethane materials, mould and pouring and coating technologies are analyzed for the defects existing in the preproduction of composite polyurethane-based insulation coating for pipeline, such as bubble, unwanted pattern, coating thickness deviation, unacceptable caking property, improper processing method of glass hollow microsphere, etc. Solutions are given to make an acceptable pipe. Moreover, a better process flow of composite polyurethane-based insulation pipe is obtained, and the process parameters are optimized.

Key words: insulation pipeline, composite polyurethane, insulation coating, preproduction, defect, solution

CLC Number:

TE973.92

Xiao-bin JIANG, Xiao-ling ZHANG, Wen-tong WU, Rui-lin KONG, Jia-dong YANG, Bao-yin DU. Defect Analysis and Processing in Preproduction of Composite Polyurethane-Based Insulation Coating for Pipeline[J]. Ocean Engineering Equipment and Technology, 2014, 1(1): 80-83.

Figures/Tables 5

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Table 3

方案序号	模具倾斜角度/(°)	抽真空时间/min	浇注口位置	排气口位置	三通模式	气泡情况描述
1	5	0	距管端2.5 m	距封堵器30 cm	a	管端12点钟位置出现大量气泡, 面状分布, 且管道最高位置出现空洞
2	5	30	管端	紧挨封堵器	a	管体最高端位置12点钟位置出现密集气泡
3	8	0	距管端2.5 m	距封堵器30 cm	a	管端12点钟方向出现密集气泡, 管道最高位置出现空洞
4	8	30	管端	紧挨封堵器	a	管端12点钟位置出现线状分布气泡
5	10	0	距管端2.5 m	距封堵器30 cm	b	管端12点钟位置出现密集气泡, 管道最高位置出现空洞
6	10	30	管端	紧挨封堵器	b	管体最高端12点钟位置出现线状分布气泡
7	15	30	距管端2.5 m	距封堵器30 cm	b	触地管端出现少量气泡, 点状分布, 管道最高位置出现空洞
8	15	30	管端	紧挨封堵器	b	管端最高位置偶尔出现少量气泡

方案序号	试验条件	最大剪切力值/kN
1	钢管表面未加热(约20 ℃), 未做粗糙化处理	4.2, 3.9, 2.2
2	钢管表面未加热, 模具辐射给钢管加热(50 ℃), 未做粗糙化处理	29.0, 35.7, 65.4
3	钢管加热到70 ℃, 未做粗糙化处理	98.4, 100.7, 101.6
4	钢管加热到70 ℃, 进行粗糙化处理	166.8, 156.6, 170.1

方案序号	聚醚多元醇搅拌方式				混拌后间隔时间/h	枪头转速	表观密度平均值 /(kg·m^-3)	导热系数平均值 /(W·m^-1·K^-1)
	搅拌转速 /(r·min^-1)	搅拌时间 /min	搅拌次数
	搅拌转速 /(r·min^-1)	搅拌时间 /min							正	反
1	200	120	1			24	4000	1020	0.1975
2	200	120	1	1	12	3600	980	0.1910
3	150	90	1		24	4000	973	0.1950
4	150	90	2	2	12	3600	928	0.1875
5	100	60	1		12	4000	950	0.1890
6	100	60	2	2	6	3200	910	0.1860
7	50	40	1		2	4000	920	0.1850
8	50	40	1	1	2	3600	846	0.1785
9	50	40	2	2	2	3200	811	0.1670

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